doc/guide.html


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"
            "http://www.w3.org/TR/REC-html40/loose.dtd">
<HTML>
<HEAD>
<TITLE>
 
 
 ejabberd 2.0.0 beta 
 
 Installation and Operation Guide
 
 
</TITLE>

<META http-equiv="Content-Type" content="text/html; charset=US-ASCII">
<META name="GENERATOR" content="hevea 1.09">
<STYLE type="text/css">
.li-itemize{margin:1ex 0ex;}
.li-enumerate{margin:1ex 0ex;}
.dd-description{margin:0ex 0ex 1ex 4ex;}
.dt-description{margin:0ex;}
.toc{list-style:none;}
.thefootnotes{text-align:left;margin:0ex;}
.dt-thefootnotes{margin:0em;}
.dd-thefootnotes{margin:0em 0em 0em 2em;}
.footnoterule{margin:1em auto 1em 0px;width:50%;}
.caption{padding-left:2ex; padding-right:2ex; margin-left:auto; margin-right:auto}
.title{margin:auto;text-align:center}
.center{text-align:center;margin-left:auto;margin-right:auto;}
.flushleft{text-align:left;margin-left:0ex;margin-right:auto;}
.flushright{text-align:right;margin-left:auto;margin-right:0ex;}
DIV TABLE{margin-left:inherit;margin-right:inherit;}
PRE{text-align:left;margin-left:0ex;margin-right:auto;}
BLOCKQUOTE{margin-left:4ex;margin-right:4ex;text-align:left;}
TD P{margin:0px;}
.boxed{border:1px solid black}
.textboxed{border:1px solid black}
.vbar{border:none;width:2px;background-color:black;}
.hbar{border:none;height:2px;width:100%;background-color:black;}
.hfill{border:none;height:1px;width:200%;background-color:black;}
.vdisplay{border-collapse:separate;border-spacing:2px;width:auto; empty-cells:show; border:2px solid red;}
.vdcell{white-space:nowrap;padding:0px;width:auto; border:2px solid green;}
.display{border-collapse:separate;border-spacing:2px;width:auto; border:none;}
.dcell{white-space:nowrap;padding:0px;width:auto; border:none;}
.dcenter{margin:0ex auto;}
.vdcenter{border:solid #FF8000 2px; margin:0ex auto;}
.minipage{text-align:left; margin-left:0em; margin-right:auto;}
.marginpar{border:solid thin black; width:20%; text-align:left;}
.marginparleft{float:left; margin-left:0ex; margin-right:1ex;}
.marginparright{float:right; margin-left:1ex; margin-right:0ex;}
.theorem{text-align:left;margin:1ex auto 1ex 0ex;}
.part{margin:auto;text-align:center}
SPAN{width:20%; float:right; text-align:left; margin-left:auto;}
</STYLE>
</HEAD>
<BODY >
<!--HEVEA command line is: /usr/local/bin/hevea -fix -noiso -pedantic guide.tex -->
<!--CUT DEF chapter 1 --><P><A NAME="titlepage"></A>

</P><TABLE CLASS="title"><TR><TD><H1 CLASS="titlemain">
<HR SIZE=2><BR>
<BR>

<TABLE CELLSPACING=6 CELLPADDING=0><TR><TD ALIGN=right NOWRAP> <FONT SIZE=6><B>ejabberd 2.0.0 beta </B></FONT></TD></TR>
<TR><TD ALIGN=right NOWRAP>&nbsp;</TD></TR>
<TR><TD ALIGN=right NOWRAP> <FONT SIZE=6>Installation and Operation Guide</FONT></TD></TR>
</TABLE><BR>
<BR>

<HR SIZE=2>
<BR><BR><BR>
<BR>
<BR>
<BR>
<BR>
<BR>
<BR>
<BR>
<BR>
<BR>
<BR>
<BR>
<BR>
<BR>
<BR>
<BR>
<BR>

</H1><H3 CLASS="titlerest"><TABLE CELLSPACING=6 CELLPADDING=0><TR><TD VALIGN=top ALIGN=left>ejabberd Development Team</TD></TR>
</TABLE></H3></TD></TR>
</TABLE><!--TOC chapter Contents-->
<H1 CLASS="chapter"><!--SEC ANCHOR -->Contents</H1><!--SEC END --><UL CLASS="toc"><LI CLASS="li-toc">
<A HREF="#htoc1">Chapter&#XA0;1&#XA0;&#XA0;Introduction</A>
<UL CLASS="toc"><LI CLASS="li-toc">
<A HREF="#htoc2">1.1&#XA0;&#XA0;Key Features</A>
</LI><LI CLASS="li-toc"><A HREF="#htoc3">1.2&#XA0;&#XA0;Additional Features</A>
</LI></UL>
</LI><LI CLASS="li-toc"><A HREF="#htoc4">Chapter&#XA0;2&#XA0;&#XA0;Installing ejabberd</A>
<UL CLASS="toc"><LI CLASS="li-toc">
<A HREF="#htoc5">2.1&#XA0;&#XA0;Installing ejabberd with Graphical Installer</A>
</LI><LI CLASS="li-toc"><A HREF="#htoc6">2.2&#XA0;&#XA0;Installing ejabberd with Operating System specific packages</A>
</LI><LI CLASS="li-toc"><A HREF="#htoc7">2.3&#XA0;&#XA0;Installing ejabberd with CEAN</A>
</LI><LI CLASS="li-toc"><A HREF="#htoc8">2.4&#XA0;&#XA0;Installation from Source</A>
<UL CLASS="toc"><LI CLASS="li-toc">
<A HREF="#htoc9">2.4.1&#XA0;&#XA0;Installation Requirements</A>
</LI><LI CLASS="li-toc"><A HREF="#htoc10">2.4.2&#XA0;&#XA0;Obtaining <TT>ejabberd</TT></A>
</LI><LI CLASS="li-toc"><A HREF="#htoc11">2.4.3&#XA0;&#XA0;Compilation</A>
</LI><LI CLASS="li-toc"><A HREF="#htoc12">2.4.4&#XA0;&#XA0;Starting</A>
</LI></UL>
</LI><LI CLASS="li-toc"><A HREF="#htoc13">2.5&#XA0;&#XA0;Creating an Initial Administrator</A>
</LI></UL>
</LI><LI CLASS="li-toc"><A HREF="#htoc14">Chapter&#XA0;3&#XA0;&#XA0;Configuring ejabberd</A>
<UL CLASS="toc"><LI CLASS="li-toc">
<A HREF="#htoc15">3.1&#XA0;&#XA0;Basic Configuration</A>
<UL CLASS="toc"><LI CLASS="li-toc">
<A HREF="#htoc16">3.1.1&#XA0;&#XA0;Host Names</A>
</LI><LI CLASS="li-toc"><A HREF="#htoc17">3.1.2&#XA0;&#XA0;Virtual Hosting</A>
</LI><LI CLASS="li-toc"><A HREF="#htoc18">3.1.3&#XA0;&#XA0;Listened Sockets</A>
</LI><LI CLASS="li-toc"><A HREF="#htoc19">3.1.4&#XA0;&#XA0;Authentication</A>
</LI><LI CLASS="li-toc"><A HREF="#htoc20">3.1.5&#XA0;&#XA0;Access Rules</A>
</LI><LI CLASS="li-toc"><A HREF="#htoc21">3.1.6&#XA0;&#XA0;Shapers</A>
</LI><LI CLASS="li-toc"><A HREF="#htoc22">3.1.7&#XA0;&#XA0;Default Language</A>
</LI></UL>
</LI><LI CLASS="li-toc"><A HREF="#htoc23">3.2&#XA0;&#XA0;Database and LDAP Configuration</A>
<UL CLASS="toc"><LI CLASS="li-toc">
<A HREF="#htoc24">3.2.1&#XA0;&#XA0;MySQL</A>
</LI><LI CLASS="li-toc"><A HREF="#htoc25">3.2.2&#XA0;&#XA0;Microsoft SQL Server</A>
</LI><LI CLASS="li-toc"><A HREF="#htoc26">3.2.3&#XA0;&#XA0;PostgreSQL</A>
</LI><LI CLASS="li-toc"><A HREF="#htoc27">3.2.4&#XA0;&#XA0;ODBC Compatible</A>
</LI><LI CLASS="li-toc"><A HREF="#htoc28">3.2.5&#XA0;&#XA0;LDAP</A>
</LI></UL>
</LI><LI CLASS="li-toc"><A HREF="#htoc29">3.3&#XA0;&#XA0;Modules Configuration</A>
<UL CLASS="toc"><LI CLASS="li-toc">
<A HREF="#htoc30">3.3.1&#XA0;&#XA0;Overview</A>
</LI><LI CLASS="li-toc"><A HREF="#htoc31">3.3.2&#XA0;&#XA0;Common Options</A>
</LI><LI CLASS="li-toc"><A HREF="#htoc32">3.3.3&#XA0;&#XA0;<TT>mod_announce</TT></A>
</LI><LI CLASS="li-toc"><A HREF="#htoc33">3.3.4&#XA0;&#XA0;<TT>mod_disco</TT></A>
</LI><LI CLASS="li-toc"><A HREF="#htoc34">3.3.5&#XA0;&#XA0;<TT>mod_echo</TT></A>
</LI><LI CLASS="li-toc"><A HREF="#htoc35">3.3.6&#XA0;&#XA0;<TT>mod_irc</TT></A>
</LI><LI CLASS="li-toc"><A HREF="#htoc36">3.3.7&#XA0;&#XA0;<TT>mod_last</TT></A>
</LI><LI CLASS="li-toc"><A HREF="#htoc37">3.3.8&#XA0;&#XA0;<TT>mod_muc</TT></A>
</LI><LI CLASS="li-toc"><A HREF="#htoc38">3.3.9&#XA0;&#XA0;<TT>mod_muc_log</TT></A>
</LI><LI CLASS="li-toc"><A HREF="#htoc39">3.3.10&#XA0;&#XA0;<TT>mod_offline</TT></A>
</LI><LI CLASS="li-toc"><A HREF="#htoc40">3.3.11&#XA0;&#XA0;<TT>mod_privacy</TT></A>
</LI><LI CLASS="li-toc"><A HREF="#htoc41">3.3.12&#XA0;&#XA0;<TT>mod_private</TT></A>
</LI><LI CLASS="li-toc"><A HREF="#htoc42">3.3.13&#XA0;&#XA0;<TT>mod_proxy65</TT></A>
</LI><LI CLASS="li-toc"><A HREF="#htoc43">3.3.14&#XA0;&#XA0;<TT>mod_pubsub</TT></A>
</LI><LI CLASS="li-toc"><A HREF="#htoc44">3.3.15&#XA0;&#XA0;<TT>mod_register</TT></A>
</LI><LI CLASS="li-toc"><A HREF="#htoc45">3.3.16&#XA0;&#XA0;<TT>mod_roster</TT></A>
</LI><LI CLASS="li-toc"><A HREF="#htoc46">3.3.17&#XA0;&#XA0;<TT>mod_service_log</TT></A>
</LI><LI CLASS="li-toc"><A HREF="#htoc47">3.3.18&#XA0;&#XA0;<TT>mod_shared_roster</TT></A>
</LI><LI CLASS="li-toc"><A HREF="#htoc48">3.3.19&#XA0;&#XA0;<TT>mod_stats</TT></A>
</LI><LI CLASS="li-toc"><A HREF="#htoc49">3.3.20&#XA0;&#XA0;<TT>mod_time</TT></A>
</LI><LI CLASS="li-toc"><A HREF="#htoc50">3.3.21&#XA0;&#XA0;<TT>mod_vcard</TT></A>
</LI><LI CLASS="li-toc"><A HREF="#htoc51">3.3.22&#XA0;&#XA0;<TT>mod_vcard_ldap</TT></A>
</LI><LI CLASS="li-toc"><A HREF="#htoc52">3.3.23&#XA0;&#XA0;<TT>mod_version</TT></A>
</LI></UL>
</LI></UL>
</LI><LI CLASS="li-toc"><A HREF="#htoc53">Chapter&#XA0;4&#XA0;&#XA0;Managing an ejabberd server</A>
<UL CLASS="toc"><LI CLASS="li-toc">
<A HREF="#htoc54">4.1&#XA0;&#XA0;Online Configuration and Monitoring</A>
<UL CLASS="toc"><LI CLASS="li-toc">
<A HREF="#htoc55">4.1.1&#XA0;&#XA0;Web Interface</A>
</LI><LI CLASS="li-toc"><A HREF="#htoc56">4.1.2&#XA0;&#XA0;<TT>ejabberdctl</TT></A>
</LI></UL>
</LI></UL>
</LI><LI CLASS="li-toc"><A HREF="#htoc57">Chapter&#XA0;5&#XA0;&#XA0;Securing ejabberd</A>
<UL CLASS="toc"><LI CLASS="li-toc">
<A HREF="#htoc58">5.1&#XA0;&#XA0;Firewall Settings</A>
</LI></UL>
</LI><LI CLASS="li-toc"><A HREF="#htoc59">Chapter&#XA0;6&#XA0;&#XA0;Integrating ejabberd with other Instant Messaging servers</A>
<UL CLASS="toc"><LI CLASS="li-toc">
<A HREF="#htoc60">6.1&#XA0;&#XA0;SRV Records</A>
</LI></UL>
</LI><LI CLASS="li-toc"><A HREF="#htoc61">Chapter&#XA0;7&#XA0;&#XA0;Clustering</A>
<UL CLASS="toc"><LI CLASS="li-toc">
<A HREF="#htoc62">7.1&#XA0;&#XA0;How it Works</A>
<UL CLASS="toc"><LI CLASS="li-toc">
<A HREF="#htoc63">7.1.1&#XA0;&#XA0;Router</A>
</LI><LI CLASS="li-toc"><A HREF="#htoc64">7.1.2&#XA0;&#XA0;Local Router</A>
</LI><LI CLASS="li-toc"><A HREF="#htoc65">7.1.3&#XA0;&#XA0;Session Manager</A>
</LI><LI CLASS="li-toc"><A HREF="#htoc66">7.1.4&#XA0;&#XA0;s2s Manager</A>
</LI></UL>
</LI><LI CLASS="li-toc"><A HREF="#htoc67">7.2&#XA0;&#XA0;Clustering Setup</A>
</LI><LI CLASS="li-toc"><A HREF="#htoc68">7.3&#XA0;&#XA0;Service Load-Balancing</A>
<UL CLASS="toc"><LI CLASS="li-toc">
<A HREF="#htoc69">7.3.1&#XA0;&#XA0;Components Load-Balancing</A>
</LI><LI CLASS="li-toc"><A HREF="#htoc70">7.3.2&#XA0;&#XA0;Domain Load-Balancing Algorithm</A>
</LI><LI CLASS="li-toc"><A HREF="#htoc71">7.3.3&#XA0;&#XA0;Load-Balancing Buckets</A>
</LI></UL>
</LI></UL>
</LI><LI CLASS="li-toc"><A HREF="#htoc72">Chapter&#XA0;8&#XA0;&#XA0;Debugging</A>
<UL CLASS="toc"><LI CLASS="li-toc">
<A HREF="#htoc73">8.1&#XA0;&#XA0;Watchdog alerts</A>
</LI></UL>
</LI><LI CLASS="li-toc"><A HREF="#htoc74">Appendix&#XA0;A&#XA0;&#XA0;Internationalization and Localization</A>
</LI><LI CLASS="li-toc"><A HREF="#htoc75">Appendix&#XA0;B&#XA0;&#XA0;Release Notes</A>
</LI><LI CLASS="li-toc"><A HREF="#htoc76">Appendix&#XA0;C&#XA0;&#XA0;Acknowledgements</A>
</LI><LI CLASS="li-toc"><A HREF="#htoc77">Appendix&#XA0;D&#XA0;&#XA0;Copyright Information</A>
</LI></UL><!--TOC chapter Introduction-->
<H1 CLASS="chapter"><!--SEC ANCHOR --><A NAME="htoc1">Chapter&#XA0;1</A>&#XA0;&#XA0;Introduction</H1><!--SEC END --><P>
<A NAME="intro"></A></P><P><TT>ejabberd</TT> is a free and open source instant messaging server written in <A HREF="http://www.erlang.org/">Erlang</A>.</P><P><TT>ejabberd</TT> is cross-platform, distributed, fault-tolerant, and based on open standards to achieve real-time communication.</P><P><TT>ejabberd</TT> is designed to be a rock-solid and feature rich XMPP server.</P><P><TT>ejabberd</TT> is suitable for small deployments, whether they need to be scalable or not, as well as extremely big deployments.</P><!--TOC section Key Features-->
<H2 CLASS="section"><!--SEC ANCHOR --><A NAME="htoc2">1.1</A>&#XA0;&#XA0;Key Features</H2><!--SEC END --><P>
<A NAME="keyfeatures"></A>
</P><P><TT>ejabberd</TT> is:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
Cross-platform: <TT>ejabberd</TT> runs under Microsoft Windows and Unix derived systems such as Linux, FreeBSD and NetBSD.</LI><LI CLASS="li-itemize">Distributed: You can run <TT>ejabberd</TT> on a cluster of machines and all of them will serve the same Jabber domain(s). When you need more capacity you can simply add a new cheap node to your cluster. Accordingly, you do not need to buy an expensive high-end machine to support tens of thousands concurrent users.</LI><LI CLASS="li-itemize">Fault-tolerant: You can deploy an <TT>ejabberd</TT> cluster so that all the information required for a properly working service will be replicated permanently on all nodes. This means that if one of the nodes crashes, the others will continue working without disruption. In addition, nodes also can be added or replaced `on the fly'.</LI><LI CLASS="li-itemize">Administrator Friendly: <TT>ejabberd</TT> is built on top of the Open Source Erlang. As a result you do not need to install an external database, an external web server, amongst others because everything is already included, and ready to run out of the box. Other administrator benefits include:
<UL CLASS="itemize"><LI CLASS="li-itemize">
Comprehensive documentation.
</LI><LI CLASS="li-itemize">Straightforward installers for Linux, Mac OS X, and Windows. </LI><LI CLASS="li-itemize">Web interface for administration tasks.
</LI><LI CLASS="li-itemize">Shared Roster Groups.
</LI><LI CLASS="li-itemize">Command line administration tool. </LI><LI CLASS="li-itemize">Can integrate with existing authentication mechanisms.
</LI><LI CLASS="li-itemize">Capability to send announce messages.
</LI></UL></LI><LI CLASS="li-itemize">Internationalized: <TT>ejabberd</TT> leads in internationalization. Hence it is very well suited in a globalized world. Related features are:
<UL CLASS="itemize"><LI CLASS="li-itemize">
Translated in 12 languages. </LI><LI CLASS="li-itemize">Support for <A HREF="http://www.ietf.org/rfc/rfc3490.txt">IDNA</A>.
</LI></UL></LI><LI CLASS="li-itemize">Open Standards: <TT>ejabberd</TT> is the first Open Source Jabber server claiming to fully comply to the XMPP standard.
<UL CLASS="itemize"><LI CLASS="li-itemize">
Fully XMPP compliant.
</LI><LI CLASS="li-itemize">XML-based protocol.
</LI><LI CLASS="li-itemize"><A HREF="http://ejabberd.jabber.ru/protocols">Many protocols supported</A>.
</LI></UL></LI></UL><!--TOC section Additional Features-->
<H2 CLASS="section"><!--SEC ANCHOR --><A NAME="htoc3">1.2</A>&#XA0;&#XA0;Additional Features</H2><!--SEC END --><P>
<A NAME="addfeatures"></A>
</P><P>Moreover, <TT>ejabberd</TT> comes with a wide range of other state-of-the-art features:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
Modular
<UL CLASS="itemize"><LI CLASS="li-itemize">
Load only the modules you want.
</LI><LI CLASS="li-itemize">Extend <TT>ejabberd</TT> with your own custom modules.
</LI></UL>
</LI><LI CLASS="li-itemize">Security
<UL CLASS="itemize"><LI CLASS="li-itemize">
SASL and STARTTLS for c2s and s2s connections.
</LI><LI CLASS="li-itemize">STARTTLS and Dialback s2s connections.
</LI><LI CLASS="li-itemize">Web interface accessible via HTTPS secure access.
</LI></UL>
</LI><LI CLASS="li-itemize">Databases
<UL CLASS="itemize"><LI CLASS="li-itemize">
Native MySQL support.
</LI><LI CLASS="li-itemize">Native PostgreSQL support.
</LI><LI CLASS="li-itemize">Mnesia.
</LI><LI CLASS="li-itemize">ODBC data storage support.
</LI><LI CLASS="li-itemize">Microsoft SQL Server support. </LI></UL>
</LI><LI CLASS="li-itemize">Authentication
<UL CLASS="itemize"><LI CLASS="li-itemize">
LDAP and ODBC. </LI><LI CLASS="li-itemize">External Authentication script.
</LI><LI CLASS="li-itemize">Internal Authentication.
</LI></UL>
</LI><LI CLASS="li-itemize">Others
<UL CLASS="itemize"><LI CLASS="li-itemize">
Compressing XML streams with Stream Compression (<A HREF="http://www.xmpp.org/extensions/xep-0138.html">XEP-0138</A>).
</LI><LI CLASS="li-itemize">Interface with networks such as AIM, ICQ and MSN.
</LI><LI CLASS="li-itemize">Statistics via Statistics Gathering (<A HREF="http://www.xmpp.org/extensions/xep-0039.html">XEP-0039</A>).
</LI><LI CLASS="li-itemize">IPv6 support both for c2s and s2s connections.
</LI><LI CLASS="li-itemize"><A HREF="http://www.xmpp.org/extensions/xep-0045.html">Multi-User Chat</A> module with logging. </LI><LI CLASS="li-itemize">Users Directory based on users vCards.
</LI><LI CLASS="li-itemize"><A HREF="http://www.xmpp.org/extensions/xep-0060.html">Publish-Subscribe</A> component.
</LI><LI CLASS="li-itemize">Support for virtual hosting.
</LI><LI CLASS="li-itemize"><A HREF="http://www.xmpp.org/extensions/xep-0025.html">HTTP Polling</A> service.
</LI><LI CLASS="li-itemize">IRC transport.
</LI></UL>
</LI></UL><!--TOC chapter Installing ejabberd-->
<H1 CLASS="chapter"><!--SEC ANCHOR --><A NAME="htoc4">Chapter&#XA0;2</A>&#XA0;&#XA0;Installing ejabberd</H1><!--SEC END --><!--TOC section Installing ejabberd with Graphical Installer-->
<H2 CLASS="section"><!--SEC ANCHOR --><A NAME="htoc5">2.1</A>&#XA0;&#XA0;Installing ejabberd with Graphical Installer</H2><!--SEC END --><P>The easiest approach to install an ejabberd Instant Messaging server
is to use the graphical installer. The installer is available in
ejabberd Process-one 
<A HREF="http://www.process-one.net/en/ejabberd/downloads/">downloads page</A>.</P><P>The installer will deploy and configure a full featured ejabberd
server and does not require any extra dependancies.</P><!--TOC section Installing ejabberd with Operating System specific packages-->
<H2 CLASS="section"><!--SEC ANCHOR --><A NAME="htoc6">2.2</A>&#XA0;&#XA0;Installing ejabberd with Operating System specific packages</H2><!--SEC END --><P>Some Operating Systems provide a specific ejabberd package adapted to 
your system architecture and libraries, which also checks dependencies 
and performs basic configuration tasks like creating the initial
administrator account. Some examples are Debian and Gentoo. Consult the
resources provided by your Operating System for more information.</P><!--TOC section Installing ejabberd with CEAN-->
<H2 CLASS="section"><!--SEC ANCHOR --><A NAME="htoc7">2.3</A>&#XA0;&#XA0;Installing ejabberd with CEAN</H2><!--SEC END --><P><A HREF="http://cean.process-one.net/">CEAN</A>
(Comprehensive Erlang Archive Network) is a repository that hosts binary
packages from many Erlang programs, including ejabberd and all its dependencies.
The binaries are available for many different system architectures, so this is an
alternative to the binary installer and Operating System's ejabberd packages.</P><!--TOC section Installation from Source-->
<H2 CLASS="section"><!--SEC ANCHOR --><A NAME="htoc8">2.4</A>&#XA0;&#XA0;Installation from Source</H2><!--SEC END --><P>
<A NAME="installsource"></A>
</P><!--TOC subsection Installation Requirements-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc9">2.4.1</A>&#XA0;&#XA0;Installation Requirements</H3><!--SEC END --><P>
<A NAME="installreq"></A>
</P><!--TOC subsubsection `Unix-like' operating systems-->
<H4 CLASS="subsubsection"><!--SEC ANCHOR -->`Unix-like' operating systems</H4><!--SEC END --><P>
<A NAME="installrequnix"></A></P><P>To compile <TT>ejabberd</TT> on a `Unix-like' operating system, you need:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
GNU Make
</LI><LI CLASS="li-itemize">GCC
</LI><LI CLASS="li-itemize">libexpat 1.95 or higher
</LI><LI CLASS="li-itemize">Erlang/OTP R9C-2 or higher
</LI><LI CLASS="li-itemize">OpenSSL 0.9.6 or higher (optional)
</LI><LI CLASS="li-itemize">Zlib 1.2.3 or higher (optional)
</LI><LI CLASS="li-itemize">GNU Iconv 1.8 or higher (optional, not needed on systems with GNU libc)
</LI></UL><!--TOC subsubsection Windows-->
<H4 CLASS="subsubsection"><!--SEC ANCHOR -->Windows</H4><!--SEC END --><P>
<A NAME="installreqwin"></A></P><P>To compile <TT>ejabberd</TT> on a Windows flavour, you need:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
MS Visual C++ 6.0 Compiler
</LI><LI CLASS="li-itemize"><A HREF="http://erlang.org/download.html">Erlang/OTP R9C-2 or higher</A>
</LI><LI CLASS="li-itemize"><A HREF="http://sourceforge.net/project/showfiles.php?group_id=10127&package_id=11277">Expat 1.95.7 or higher</A>
</LI><LI CLASS="li-itemize"><A HREF="http://www.gnu.org/software/libiconv/">GNU Iconv 1.9.1</A>
(optional)
</LI><LI CLASS="li-itemize"><A HREF="http://www.slproweb.com/products/Win32OpenSSL.html">Shining Light OpenSSL</A>
(to enable SSL connections)
</LI><LI CLASS="li-itemize"><A HREF="http://www.zlib.net/">Zlib 1.2.3 or higher</A>
</LI></UL><!--TOC subsection Obtaining <TT>ejabberd</TT>-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc10">2.4.2</A>&#XA0;&#XA0;Obtaining <TT>ejabberd</TT></H3><!--SEC END --><P>
<A NAME="obtaining"></A></P><P>
Released versions of <TT>ejabberd</TT> can be obtained from<BR>
<A HREF="http://www.process-one.net/en/projects/ejabberd/download.html"><TT>http://www.process-one.net/en/projects/ejabberd/download.html</TT></A>.</P><P>
The latest development version can be retrieved from the Subversion repository.
</P><PRE CLASS="verbatim">  svn co http://svn.process-one.net/ejabberd/trunk ejabberd
</PRE><!--TOC subsection Compilation-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc11">2.4.3</A>&#XA0;&#XA0;Compilation</H3><!--SEC END --><P>
<A NAME="compile"></A>
</P><!--TOC subsubsection `Unix-like' operating systems-->
<H4 CLASS="subsubsection"><!--SEC ANCHOR -->`Unix-like' operating systems</H4><!--SEC END --><P>
<A NAME="compileunix"></A></P><P>Compile <TT>ejabberd</TT> on a `Unix-like' operating system by executing:</P><PRE CLASS="verbatim">  ./configure
  make
  su
  make install
</PRE><P>These commands will:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
install <TT>ejabberd</TT> into the directory <CODE>/var/lib/ejabberd</CODE>,
</LI><LI CLASS="li-itemize">install the configuration file into <CODE>/etc/ejabberd</CODE>,
</LI><LI CLASS="li-itemize">create a directory called <CODE>/var/log/ejabberd</CODE> to store log files.
</LI></UL><!--TOC subsubsection Build options-->
<H4 CLASS="subsubsection"><!--SEC ANCHOR -->Build options</H4><!--SEC END --><P>If you want to enable the use of XML based optimisations, you can use
the option<TT>&#X2013;enable-full-xml</TT> when running the <TT>configure</TT>
command. It will for example use CDATA to escape characters in the
XMPP stream. Do not use this option if all your clients are not using
a fully compliant XML parser.</P><P>If you want to use an external database, you need to execute the configure
script with the option(s) <TT>&#X2013;enable-odbc</TT> or <TT>&#X2013;enable-odbc
&#X2013;enable-mssql</TT>. See section&#XA0;<A HREF="#database">3.2</A> for more information.</P><!--TOC subsubsection Windows-->
<H4 CLASS="subsubsection"><!--SEC ANCHOR -->Windows</H4><!--SEC END --><P>
<A NAME="compilewin"></A></P><UL CLASS="itemize"><LI CLASS="li-itemize">
Install Erlang emulator (for example, into <CODE>C:\Program Files\erl5.3</CODE>).
</LI><LI CLASS="li-itemize">Install Expat library into <CODE>C:\Program Files\Expat-1.95.7</CODE>
directory.<P>Copy file <CODE>C:\Program Files\Expat-1.95.7\Libs\libexpat.dll</CODE>
to your Windows system directory (for example, <CODE>C:\WINNT</CODE> or
<CODE>C:\WINNT\System32</CODE>)
</P></LI><LI CLASS="li-itemize">Build and install the Iconv library into the directory
<CODE>C:\Program Files\iconv-1.9.1</CODE>.<P>Copy file <CODE>C:\Program Files\iconv-1.9.1\bin\iconv.dll</CODE> to your
Windows system directory (more installation instructions can be found in the
file README.woe32 in the iconv distribution).</P><P>Note: instead of copying libexpat.dll and iconv.dll to the Windows
directory, you can add the directories
<CODE>C:\Program Files\Expat-1.95.7\Libs</CODE> and
<CODE>C:\Program Files\iconv-1.9.1\bin</CODE> to the <CODE>PATH</CODE> environment
variable.
</P></LI><LI CLASS="li-itemize">While in the directory <CODE>ejabberd\src</CODE> run:
<PRE CLASS="verbatim">configure.bat
nmake -f Makefile.win32
</PRE></LI><LI CLASS="li-itemize">Edit the file <CODE>ejabberd\src\ejabberd.cfg</CODE> and run
<PRE CLASS="verbatim">werl -s ejabberd -name ejabberd
</PRE></LI></UL><!--TOC subsection Starting-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc12">2.4.4</A>&#XA0;&#XA0;Starting</H3><!--SEC END --><P>
<A NAME="start"></A>

</P><P>Execute the following command to start <TT>ejabberd</TT>:
</P><PRE CLASS="verbatim">  erl -pa /var/lib/ejabberd/ebin -name ejabberd -s ejabberd
</PRE><P>or
</P><PRE CLASS="verbatim">  erl -pa /var/lib/ejabberd/ebin -sname ejabberd -s ejabberd
</PRE><P>In the latter case the Erlang node will be identified using only the first part
of the host name, i.&#XA0;e. other Erlang nodes outside this domain cannot contact
this node.</P><P>Note that when using the above command, <TT>ejabberd</TT> will search for the
configuration file in the current directory and will use the current directory
for storing its user database and for logging.</P><P>To specify the path to the configuration file, the log files and the Mnesia
database directory, you may use the following command:
</P><PRE CLASS="verbatim">  erl -pa /var/lib/ejabberd/ebin \
      -sname ejabberd \
      -s ejabberd \
      -ejabberd config \"/etc/ejabberd/ejabberd.cfg\" \
                log_path \"/var/log/ejabberd/ejabberd.log\" \
      -sasl sasl_error_logger \{file,\"/var/log/ejabberd/sasl.log\"\} \
      -mnesia dir \"/var/lib/ejabberd/spool\"
</PRE><P>You can find other useful options in the Erlang manual page
(<TT>erl -man erl</TT>).</P><P>To use more than 1024 connections, you should set the environment variable
<CODE>ERL_MAX_PORTS</CODE>:
</P><PRE CLASS="verbatim">  export ERL_MAX_PORTS=32000
</PRE><P>Note that with this value, <TT>ejabberd</TT> will use more memory (approximately 6&#XA0;MB
more).</P><P>To reduce memory usage, you may set the environment variable
<CODE>ERL_FULLSWEEP_AFTER</CODE>:
</P><PRE CLASS="verbatim">  export ERL_FULLSWEEP_AFTER=0
</PRE><P>But in this case <TT>ejabberd</TT> can start to work slower.</P><!--TOC section Creating an Initial Administrator-->
<H2 CLASS="section"><!--SEC ANCHOR --><A NAME="htoc13">2.5</A>&#XA0;&#XA0;Creating an Initial Administrator</H2><!--SEC END --><P>
<A NAME="initialadmin"></A></P><P>Before the web interface can be entered to perform administration tasks, an
account with administrator rights is needed on your <TT>ejabberd</TT> deployment.</P><P>Instructions to create an initial administrator account:
</P><OL CLASS="enumerate" type=1><LI CLASS="li-enumerate">
Register an account on your <TT>ejabberd</TT> deployment. An account can be
created in two ways:
<OL CLASS="enumerate" type=a><LI CLASS="li-enumerate">
Using the tool <TT>ejabberdctl</TT> (see
section&#XA0;<A HREF="#ejabberdctl">4.1.2</A>):
<PRE CLASS="verbatim">% ejabberdctl node@host register admin example.org password
</PRE></LI><LI CLASS="li-enumerate">Using In-Band Registration (see section&#XA0;<A HREF="#modregister">3.3.15</A>): you can
use a Jabber client to register an account.
</LI></OL>
</LI><LI CLASS="li-enumerate">Edit the configuration file to promote the account created in the previous
step to an account with administrator rights. Note that if you want to add
more administrators, a seperate acl entry is needed for each administrator.
<PRE CLASS="verbatim">  {acl, admins, {user, "admin", "example.org"}}.
  {access, configure, [{allow, admins}]}.
</PRE></LI><LI CLASS="li-enumerate">Restart <TT>ejabberd</TT> to load the new configuration.
</LI><LI CLASS="li-enumerate">Open the web interface (<CODE>http://server:port/admin/</CODE>) in your
favourite browser. Make sure to enter the <EM>full</EM> JID as username (in this
example: <TT>admin@example.org</TT>. The reason that you also need to enter the
suffix, is because <TT>ejabberd</TT>'s virtual hosting support.
</LI></OL><!--TOC chapter Configuring ejabberd-->
<H1 CLASS="chapter"><!--SEC ANCHOR --><A NAME="htoc14">Chapter&#XA0;3</A>&#XA0;&#XA0;Configuring ejabberd</H1><!--SEC END --><!--TOC section Basic Configuration-->
<H2 CLASS="section"><!--SEC ANCHOR --><A NAME="htoc15">3.1</A>&#XA0;&#XA0;Basic Configuration</H2><!--SEC END --><P>
<A NAME="basicconfig"></A>
</P><P>The configuration file will be loaded the first time you start <TT>ejabberd</TT>. The
content from this file will be parsed and stored in a database. Subsequently the
configuration will be loaded from the database and any commands in the
configuration file are appended to the entries in the database. The
configuration file contains a sequence of Erlang terms. Lines beginning with a
<TT>`%'</TT> sign are ignored. Each term is a tuple of which the first element is
the name of an option, and any further elements are that option's values. If the
configuration file do not contain for instance the `hosts' option, the old
host name(s) stored in the database will be used.</P><P>You can override the old values stored in the database by adding next lines to
the configuration file:
</P><PRE CLASS="verbatim">  override_global.
  override_local.
  override_acls.
</PRE><P>With these lines the old global options (shared between all ejabberd nodes in a
cluster), local options (which are specific for this particular ejabberd node)
and ACLs will be removed before new ones are added.</P><!--TOC subsection Host Names-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc16">3.1.1</A>&#XA0;&#XA0;Host Names</H3><!--SEC END --><P>
<A NAME="hostnames"></A>
</P><P>The option <TT>hosts</TT> defines a list containing one or more domains that
<TT>ejabberd</TT> will serve.</P><P>Examples:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
Serving one domain:
<PRE CLASS="verbatim">  {hosts, ["example.org"]}.
</PRE></LI><LI CLASS="li-itemize">Serving one domain, and backwards compatible with older <TT>ejabberd</TT>
versions:
<PRE CLASS="verbatim">  {host, "example.org"}.
</PRE></LI><LI CLASS="li-itemize">Serving two domains:
<PRE CLASS="verbatim">  {hosts, ["example.net", "example.com"]}.
</PRE></LI></UL><!--TOC subsection Virtual Hosting-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc17">3.1.2</A>&#XA0;&#XA0;Virtual Hosting</H3><!--SEC END --><P>
<A NAME="virtualhost"></A>
</P><P>Options can be defined separately for every virtual host using the
<TT>host_config</TT> option. It has the following
syntax:
</P><PRE CLASS="verbatim">  {host_config, &lt;hostname&gt;, [&lt;option&gt;, &lt;option&gt;, ...]}.
</PRE><P>Examples:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
Domain <TT>example.net</TT> is using the internal authentication method while
domain <TT>example.com</TT> is using the LDAP server running on the
domain <TT>localhost</TT> to perform authentication:
<PRE CLASS="verbatim">{host_config, "example.net", [{auth_method, internal}]}.

{host_config, "example.com", [{auth_method, ldap},
                              {ldap_servers, ["localhost"]},
                              {ldap_uids, [{"uid"}]},
                              {ldap_rootdn, "dc=localdomain"},
                              {ldap_rootdn, "dc=example,dc=com"},
                              {ldap_password, ""}]}.
</PRE></LI><LI CLASS="li-itemize">Domain <TT>example.net</TT> is using ODBC to perform authentication
while domain <TT>example.com</TT> is using the LDAP servers running on the domains
<TT>localhost</TT> and <TT>otherhost</TT>:
<PRE CLASS="verbatim">{host_config, "example.net", [{auth_method, odbc},
                              {odbc_server, "DSN=ejabberd;UID=ejabberd;PWD=ejabberd"}]}.

{host_config, "example.com", [{auth_method, ldap},
                              {ldap_servers, ["localhost", "otherhost"]},
                              {ldap_uids, [{"uid"}]},
                              {ldap_rootdn, "dc=localdomain"},
                              {ldap_rootdn, "dc=example,dc=com"},
                              {ldap_password, ""}]}.
</PRE></LI></UL><!--TOC subsection Listened Sockets-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc18">3.1.3</A>&#XA0;&#XA0;Listened Sockets</H3><!--SEC END --><P>
<A NAME="listened"></A>
</P><P>The option <TT>listen</TT> defines for which addresses and ports <TT>ejabberd</TT>
will listen and what services will be run on them. Each element of the list is a
tuple with the following elements:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
Port number.
</LI><LI CLASS="li-itemize">Module that serves this port.
</LI><LI CLASS="li-itemize">Options to this module.
</LI></UL><P>
Currently next modules are implemented:
</P><BLOCKQUOTE CLASS="table"><DIV CLASS="center"><DIV CLASS="center"><HR WIDTH="80%" SIZE=2></DIV>

<TABLE BORDER=1 CELLSPACING=0 CELLPADDING=1><TR><TD VALIGN=top ALIGN=left NOWRAP><TT>ejabberd_c2s</TT></TD><TD VALIGN=top ALIGN=left NOWRAP>Description</TD><TD VALIGN=top ALIGN=left>Handles c2s connections.</TD></TR>
<TR><TD VALIGN=top ALIGN=left NOWRAP>&nbsp;</TD><TD VALIGN=top ALIGN=left NOWRAP>Options</TD><TD VALIGN=top ALIGN=left><TT>access</TT>, <TT>certfile</TT>, <TT>inet6</TT>,
<TT>ip</TT>, <TT>max_stanza_size</TT>, <TT>shaper</TT>, <TT>ssl</TT>,
<TT>tls</TT>, <TT>starttls</TT>, <TT>starttls_required</TT>,
<TT>zlib</TT></TD></TR>
<TR><TD VALIGN=top ALIGN=left NOWRAP><TT>ejabberd_s2s_in</TT></TD><TD VALIGN=top ALIGN=left NOWRAP>Description</TD><TD VALIGN=top ALIGN=left>Handles incoming s2s
connections.</TD></TR>
<TR><TD VALIGN=top ALIGN=left NOWRAP>&nbsp;</TD><TD VALIGN=top ALIGN=left NOWRAP>Options</TD><TD VALIGN=top ALIGN=left><TT>inet6</TT>, <TT>ip</TT>,
<TT>max_stanza_size</TT></TD></TR>
<TR><TD VALIGN=top ALIGN=left NOWRAP><TT>ejabberd_service</TT></TD><TD VALIGN=top ALIGN=left NOWRAP>Description</TD><TD VALIGN=top ALIGN=left>Interacts with external
components (*).</TD></TR>
<TR><TD VALIGN=top ALIGN=left NOWRAP>&nbsp;</TD><TD VALIGN=top ALIGN=left NOWRAP>Options</TD><TD VALIGN=top ALIGN=left><TT>access</TT>, <TT>hosts</TT>, <TT>inet6</TT>,
<TT>ip</TT>, <TT>shaper</TT></TD></TR>
<TR><TD VALIGN=top ALIGN=left NOWRAP><TT>ejabberd_http</TT></TD><TD VALIGN=top ALIGN=left NOWRAP>Description</TD><TD VALIGN=top ALIGN=left>Handles incoming HTTP
connections.</TD></TR>
<TR><TD VALIGN=top ALIGN=left NOWRAP>&nbsp;</TD><TD VALIGN=top ALIGN=left NOWRAP>Options</TD><TD VALIGN=top ALIGN=left><TT>certfile</TT>, <TT>http_poll</TT>,
<TT>inet6</TT>, <TT>ip</TT>, <TT>tls</TT>, <TT>web_admin</TT></TD></TR>
</TABLE>
<DIV CLASS="center"><HR WIDTH="80%" SIZE=2></DIV></DIV></BLOCKQUOTE><P>(*) The mechanism for <A HREF="http://ejabberd.jabber.ru/tutorials-transports">external components</A> is defined in Jabber Component Protocol (<A HREF="http://www.xmpp.org/extensions/xep-0114.html">XEP-0114</A>).</P><P>The following options are available:
</P><DL CLASS="description"><DT CLASS="dt-description">
<B><TT>{access, &lt;access rule&gt;}</TT></B></DT><DD CLASS="dd-description"> This option defines
access to the port. The default value is <TT>all</TT>.
</DD><DT CLASS="dt-description"><B><TT>{certfile, Path}</TT></B></DT><DD CLASS="dd-description"> Path to a file containing the SSL certificate.
</DD><DT CLASS="dt-description"><B><TT>{hosts, [Hostnames], [HostOptions]}</TT></B></DT><DD CLASS="dd-description"> This option
defines one or more hostnames of connected services and enables you to
specify additional options including <TT>{password, Secret}</TT>.
</DD><DT CLASS="dt-description"><B><TT>http_poll</TT></B></DT><DD CLASS="dd-description"> 
This option enables HTTP Polling (<A HREF="http://www.xmpp.org/extensions/xep-0025.html">XEP-0025</A>) support. HTTP Polling
enables access via HTTP requests to <TT>ejabberd</TT> from behind firewalls which
do not allow outgoing sockets on port 5222.<P>If HTTP Polling is enabled, it will be available at
<CODE>http://server:port/http-poll/</CODE>. Be aware that support for HTTP Polling
is also needed in the Jabber client. Remark also that HTTP Polling can be
interesting to host a web-based Jabber client such as
<A HREF="http://jwchat.sourceforge.net/">JWChat</A> (there is a tutorial to
<A HREF="http://ejabberd.jabber.ru/jwchat">install JWChat</A> with
instructions for <TT>ejabberd</TT>).
</P></DD><DT CLASS="dt-description"><B><TT>inet6</TT></B></DT><DD CLASS="dd-description"> Set up the socket for IPv6.
</DD><DT CLASS="dt-description"><B><TT>{ip, IPAddress}</TT></B></DT><DD CLASS="dd-description"> This option specifies which network
interface to listen for. For example <CODE>{ip, {192, 168, 1, 1}}</CODE>.
</DD><DT CLASS="dt-description"><B><TT>{max_stanza_size, Size}</TT></B></DT><DD CLASS="dd-description">
This option specifies an
approximate maximum size in bytes of XML stanzas. Approximate,
because it is calculated with the precision of one block of readed
data. For example <CODE>{max_stanza_size, 65536}</CODE>. The default
value is <TT>infinity</TT>. Recommanded values are 65536 for c2s
connections and 131072 for s2s connections. s2s max stanza size
must always much higher than c2s limit. Change this value with
extreme care as it can cause unwanted disconnect if set too low.
</DD><DT CLASS="dt-description"><B><TT>{shaper, &lt;access rule&gt;}</TT></B></DT><DD CLASS="dd-description"> This option defines a
shaper for the port (see section&#XA0;<A HREF="#shapers">3.1.6</A>). The default value
is <TT>none</TT>.
</DD><DT CLASS="dt-description"><B><TT>ssl</TT></B></DT><DD CLASS="dd-description"> This option specifies that traffic on
the port will be encrypted using SSL. You should also set the
<TT>certfile</TT> option. It is recommended to use the <TT>tls</TT> option
instead.
</DD><DT CLASS="dt-description"><B><TT>starttls</TT></B></DT><DD CLASS="dd-description"> This option
specifies that STARTTLS encryption is available on connections to the port.
You should also set the <TT>certfile</TT> option.
</DD><DT CLASS="dt-description"><B><TT>starttls_required</TT></B></DT><DD CLASS="dd-description"> This option
specifies that STARTTLS encryption is required on connections to the port.
No unencrypted connections will be allowed. You should also set the
<TT>certfile</TT> option.
</DD><DT CLASS="dt-description"><B><TT>tls</TT></B></DT><DD CLASS="dd-description"> This option specifies that traffic on
the port will be encrypted using SSL immediately after connecting. You
should also set the <TT>certfile</TT> option.
</DD><DT CLASS="dt-description"><B><TT>zlib</TT></B></DT><DD CLASS="dd-description"> This
option specifies that Zlib stream compression (as defined in <A HREF="http://www.xmpp.org/extensions/xep-0138.html">XEP-0138</A>)
is available on connections to the port. Client connections cannot use
stream compression and stream encryption simultaneously. Hence, if you
specify both <TT>tls</TT> (or <TT>ssl</TT>) and <TT>zlib</TT>, the latter
option will not affect connections (there will be no stream compression).
</DD><DT CLASS="dt-description"><B><TT>web_admin</TT></B></DT><DD CLASS="dd-description"> This option
enables the web interface for <TT>ejabberd</TT> administration which is available
at <CODE>http://server:port/admin/</CODE>. Login and password are the username and
password of one of the registered users who are granted access by the
`configure' access rule.
</DD><DT CLASS="dt-description"><B><TT>component_check_from</TT></B></DT><DD CLASS="dd-description"> 
This option can be used with <TT>ejabberd_service</TT> only. It is
used to disable control on the from field on packets send by an
external components. The option can be either <TT>true</TT> or
<TT>false</TT>. The default value is <TT>true</TT> which conforms to <A HREF="http://www.xmpp.org/extensions/xep-0114.html">XEP-0114</A>.
</DD></DL><P>In addition, the following options are available for s2s connections:
</P><DL CLASS="description"><DT CLASS="dt-description">
<B><TT>{s2s_use_starttls, true|false}</TT></B></DT><DD CLASS="dd-description">
This option defines whether to
use STARTTLS for s2s connections.
</DD><DT CLASS="dt-description"><B><TT>{s2s_certfile, Path}</TT></B></DT><DD CLASS="dd-description"> Path to a
file containing a SSL certificate.
</DD><DT CLASS="dt-description"><B><TT>{domain_certfile, Domain, Path}</TT></B></DT><DD CLASS="dd-description"> Path
to the file containing the SSL certificate for the specified domain.
</DD></DL><P>For instance, the following configuration defines that:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
c2s connections are listened for on port 5222 and 5223 (SSL) and denied
for the user called `<TT>bad</TT>'.
</LI><LI CLASS="li-itemize">s2s connections are listened for on port 5269 with STARTTLS for secured
traffic enabled.
</LI><LI CLASS="li-itemize">Port 5280 is serving the web interface and the HTTP Polling service. Note
that it is also possible to serve them on different ports. The second
example in section&#XA0;<A HREF="#webinterface">4.1.1</A> shows how exactly this can be done.
</LI><LI CLASS="li-itemize">All users except for the administrators have a traffic of limit 
1,000&#XA0;Bytes/second
</LI><LI CLASS="li-itemize">The
<A HREF="http://ejabberd.jabber.ru/pyaimt">AIM transport</A>
<TT>aim.example.org</TT> is connected to port 5233 with password
`<TT>aimsecret</TT>'.
</LI><LI CLASS="li-itemize">The ICQ transport JIT (<TT>icq.example.org</TT> and
<TT>sms.example.org</TT>) is connected to port 5234 with password
`<TT>jitsecret</TT>'.
</LI><LI CLASS="li-itemize">The
<A HREF="http://ejabberd.jabber.ru/pymsnt">MSN transport</A>
<TT>msn.example.org</TT> is connected to port 5235 with password
`<TT>msnsecret</TT>'.
</LI><LI CLASS="li-itemize">The
<A HREF="http://ejabberd.jabber.ru/yahoo-transport-2">Yahoo! transport</A>
<TT>yahoo.example.org</TT> is connected to port 5236 with password
`<TT>yahoosecret</TT>'.
</LI><LI CLASS="li-itemize">The <A HREF="http://ejabberd.jabber.ru/jabber-gg-transport">Gadu-Gadu transport</A> <TT>gg.example.org</TT> is
connected to port 5237 with password `<TT>ggsecret</TT>'.
</LI><LI CLASS="li-itemize">The
<A HREF="http://ejabberd.jabber.ru/jmc">Jabber Mail Component</A>
<TT>jmc.example.org</TT> is connected to port 5238 with password
`<TT>jmcsecret</TT>'.
</LI><LI CLASS="li-itemize">The service custom has enabled the special option to avoiding checking the <TT>from</TT> attribute in the packets send by this component. The component can send packets in behalf of any users from the server, or even on behalf of any server.
</LI></UL><PRE CLASS="verbatim">  {acl, blocked, {user, "bad"}}.
  {access, c2s, [{deny, blocked},
                 {allow, all}]}.
  {shaper, normal, {maxrate, 1000}}.
  {access, c2s_shaper, [{none, admin},
                        {normal, all}]}.
  {listen,
   [{5222, ejabberd_c2s,     [{access, c2s}, {shaper, c2s_shaper}]},
    {5223, ejabberd_c2s,     [{access, c2s},
                              ssl, {certfile, "/path/to/ssl.pem"}]},
    {5269, ejabberd_s2s_in,  []},
    {5280, ejabberd_http,    [http_poll, web_admin]},
    {5233, ejabberd_service, [{host, "aim.example.org",
                               [{password, "aimsecret"}]}]},
    {5234, ejabberd_service, [{hosts, ["icq.example.org", "sms.example.org"],
                               [{password, "jitsecret"}]}]},
    {5235, ejabberd_service, [{host, "msn.example.org",
                               [{password, "msnsecret"}]}]},
    {5236, ejabberd_service, [{host, "yahoo.example.org",
                               [{password, "yahoosecret"}]}]},
    {5237, ejabberd_service, [{host, "gg.example.org",
                               [{password, "ggsecret"}]}]},
    {5238, ejabberd_service, [{host, "jmc.example.org",
                               [{password, "jmcsecret"}]}]},
    {5239, ejabberd_service, [{host, "custom.example.org",
                               [{password, "customsecret"}]},
                              {service_check_from, false}]}
   ]
  }.
  {S2s_use_starttls, true}.
  {s2s_certfile, "/path/to/ssl.pem"}.
</PRE><P>Note, that for jabberd 1.4- or WPJabber-based
services you have to make the transports log and do XDB by themselves:
</P><PRE CLASS="verbatim">  &lt;!--
     You have to add elogger and rlogger entries here when using ejabberd.
     In this case the transport will do the logging.
  --&gt;

  &lt;log id='logger'&gt;
    &lt;host/&gt;
    &lt;logtype/&gt;
    &lt;format&gt;%d: [%t] (%h): %s&lt;/format&gt;
    &lt;file&gt;/var/log/jabber/service.log&lt;/file&gt;
  &lt;/log&gt;

  &lt;!--
     Some Jabber server implementations do not provide
     XDB services (for example, jabberd2 and ejabberd).
     xdb_file.so is loaded in to handle all XDB requests.
  --&gt;

  &lt;xdb id="xdb"&gt;
    &lt;host/&gt;
    &lt;load&gt;
      &lt;!-- this is a lib of wpjabber or jabberd --&gt;
      &lt;xdb_file&gt;/usr/lib/jabber/xdb_file.so&lt;/xdb_file&gt;
      &lt;/load&gt;
    &lt;xdb_file xmlns="jabber:config:xdb_file"&gt;
      &lt;spool&gt;&lt;jabberd:cmdline flag='s'&gt;/var/spool/jabber&lt;/jabberd:cmdline&gt;&lt;/spool&gt;
    &lt;/xdb_file&gt;
  &lt;/xdb&gt;
</PRE><!--TOC subsection Authentication-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc19">3.1.4</A>&#XA0;&#XA0;Authentication</H3><!--SEC END --><P>
<A NAME="auth"></A>
</P><P>The option <TT>auth_method</TT> defines the authentication method that is used
for user authentication:
</P><PRE CLASS="verbatim">  {auth_method, [&lt;method&gt;]}.
</PRE><P>The following authentication methods are supported by <TT>ejabberd</TT>:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
internal (default) &#X2014; See section&#XA0;<A HREF="#internalauth">3.1.4</A>.
</LI><LI CLASS="li-itemize">external &#X2014; There are <A HREF="http://ejabberd.jabber.ru/extauth">some
example authentication scripts</A>.
</LI><LI CLASS="li-itemize">ldap &#X2014; See section&#XA0;<A HREF="#ldap">3.2.5</A>.
</LI><LI CLASS="li-itemize">odbc &#X2014; See section&#XA0;<A HREF="#mysql">3.2.1</A>, <A HREF="#pgsql">3.2.3</A>,
<A HREF="#mssql">3.2.2</A> and <A HREF="#odbc">3.2.4</A>.
</LI><LI CLASS="li-itemize">anonymous &#X2014; See section&#XA0;<A HREF="#saslanonymous">3.1.4</A>.
</LI></UL><!--TOC subsubsection Internal-->
<H4 CLASS="subsubsection"><!--SEC ANCHOR -->Internal</H4><!--SEC END --><P>
<A NAME="internalauth"></A>
</P><P><TT>ejabberd</TT> uses its internal Mnesia database as the default authentication method.</P><UL CLASS="itemize"><LI CLASS="li-itemize">
<TT>auth_method</TT>: The value <TT>internal</TT> will enable the internal
authentication method.
</LI></UL><P>Examples:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
To use internal authentication on <TT>example.org</TT> and LDAP
authentication on <TT>example.net</TT>:
<PRE CLASS="verbatim">{host_config, "example.org", [{auth_method, [internal]}]}.
{host_config, "example.net", [{auth_method, [ldap]}]}.
</PRE></LI><LI CLASS="li-itemize">To use internal authentication on all virtual hosts:
<PRE CLASS="verbatim">{auth_method, internal}.
</PRE></LI></UL><P>If you want to define more <TT>registration_watchers</TT> or <TT>modules</TT> for a virtual host and add them to the defined for all the Jabber server, instead of defining the option name simply as <TT>modules</TT> use this: <TT>{add, modules}</TT>.</P><P>Examples:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
	If you defined two global watchers but on a certain virtual host only Ann should be watcher:
<PRE CLASS="verbatim">{registration_watchers, ["tom@example.com", "moe@example.net"]}.

{host_config, "example.org", [{registration_watchers, ["ann@example.net"]}]}.
</PRE></LI><LI CLASS="li-itemize">If you prefer all three to be registration watchers on that virtual host:
<PRE CLASS="verbatim">{registration_watchers, ["tom@example.com", "moe@example.net"]}.

{host_config, "example.org", [{{add, registration_watchers}, ["ann@example.net"]}]}.
</PRE></LI></UL><!--TOC subsubsection SASL Anonymous and Anonymous Login-->
<H4 CLASS="subsubsection"><!--SEC ANCHOR -->SASL Anonymous and Anonymous Login</H4><!--SEC END --><P>
<A NAME="saslanonymous"></A>
</P><P>The anonymous authentication method can be configured with the following
options. Remember that you can use the <TT>host_config</TT> option to set virtual
host specific options (see section&#XA0;<A HREF="#virtualhost">3.1.2</A>). Note that there also
is a detailed tutorial regarding <A HREF="http://support.process-one.net/doc/display/MESSENGER/Anonymous+users+support">SASL
Anonymous and anonymous login configuration</A>.</P><UL CLASS="itemize"><LI CLASS="li-itemize">
<TT>auth_method</TT>: The value <TT>anonymous</TT> will enable the anonymous
authentication method.
</LI><LI CLASS="li-itemize"><TT>allow_multiple_connections</TT>: This value for this option can be
either <TT>true</TT> or <TT>false</TT> and is only used when the anonymous mode is
enabled. Setting it to <TT>true</TT> means that the same username can be taken
multiple times in anonymous login mode if different resource are used to
connect. This option is only useful in very special occasions. The default
value is <TT>false</TT>.
</LI><LI CLASS="li-itemize"><TT>anonymous_protocol</TT>: This option can take three values:
<TT>sasl_anon</TT>, <TT>login_anon</TT> or <TT>both</TT>. <TT>sasl_anon</TT> means
that the SASL Anonymous method will be used. <TT>login_anon</TT> means that the
anonymous login method will be used. <TT>both</TT> means that SASL Anonymous and
login anonymous are both enabled.
</LI></UL><P>Those options are defined for each virtual host with the <TT>host_config</TT>
parameter (see section&#XA0;<A HREF="#virtualhost">3.1.2</A>).</P><P>Examples:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
To enable anonymous login on all virtual hosts:
<PRE CLASS="verbatim">{auth_method, [anonymous]}.
{anonymous_protocol, login_anon}.
  </PRE></LI><LI CLASS="li-itemize">Similar as previous example, but limited to <TT>public.example.org</TT>:
<PRE CLASS="verbatim">{host_config, "public.example.org", [{auth_method, [anonymous]},
                                     {anonymous_protocol, login_anon}]}.
</PRE></LI><LI CLASS="li-itemize">To enable anonymous login and internal authentication on a virtual host:
<PRE CLASS="verbatim">{host_config, "public.example.org", [{auth_method, [internal,anonymous]},
                                     {anonymous_protocol, login_anon}]}.
</PRE></LI><LI CLASS="li-itemize">To enable SASL Anonymous on a virtual host:
<PRE CLASS="verbatim">{host_config, "public.example.org", [{auth_method, [anonymous]},
                                     {anonymous_protocol, sasl_anon}]}.
</PRE></LI><LI CLASS="li-itemize">To enable SASL Anonymous and anonymous login on a virtual host:
<PRE CLASS="verbatim">{host_config, "public.example.org", [{auth_method, [anonymous]},
                                     {anonymous_protocol, both}]}.
</PRE></LI><LI CLASS="li-itemize">To enable SASL Anonymous, anonymous login, and internal authentication on
a virtual host:
<PRE CLASS="verbatim">{host_config, "public.example.org", [{auth_method, [internal,anonymous]},
                                     {anonymous_protocol, both}]}.
</PRE></LI></UL><!--TOC subsection Access Rules-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc20">3.1.5</A>&#XA0;&#XA0;Access Rules</H3><!--SEC END --><P>
<A NAME="accessrules"></A>
</P><!--TOC subsubsection ACL Definition-->
<H4 CLASS="subsubsection"><!--SEC ANCHOR -->ACL Definition</H4><!--SEC END --><P>
<A NAME="ACLDefinition"></A>
</P><P>Access control in <TT>ejabberd</TT> is performed via Access Control Lists (ACLs). The
declarations of ACLs in the configuration file have the following syntax:
</P><PRE CLASS="verbatim">  {acl, &lt;aclname&gt;, {&lt;acltype&gt;, ...}}.
</PRE><P><TT>&lt;acltype&gt;</TT> can be one of the following:
</P><DL CLASS="description"><DT CLASS="dt-description">
<B><TT>all</TT></B></DT><DD CLASS="dd-description"> Matches all JIDs. Example:
<PRE CLASS="verbatim">{acl, all, all}.
</PRE></DD><DT CLASS="dt-description"><B><TT>{user, &lt;username&gt;}</TT></B></DT><DD CLASS="dd-description"> Matches the user with the name
<TT>&lt;username&gt;</TT> at the first virtual host. Example:
<PRE CLASS="verbatim">{acl, admin, {user, "yozhik"}}.
</PRE></DD><DT CLASS="dt-description"><B><TT>{user, &lt;username&gt;, &lt;server&gt;}</TT></B></DT><DD CLASS="dd-description"> Matches the user with the JID
<TT>&lt;username&gt;@&lt;server&gt;</TT> and any resource. Example:
<PRE CLASS="verbatim">{acl, admin, {user, "yozhik", "example.org"}}.
</PRE></DD><DT CLASS="dt-description"><B><TT>{server, &lt;server&gt;}</TT></B></DT><DD CLASS="dd-description"> Matches any JID from server
<TT>&lt;server&gt;</TT>. Example:
<PRE CLASS="verbatim">{acl, exampleorg, {server, "example.org"}}.
</PRE></DD><DT CLASS="dt-description"><B><TT>{user_regexp, &lt;regexp&gt;}</TT></B></DT><DD CLASS="dd-description"> Matches any local user with a name that
matches <TT>&lt;regexp&gt;</TT> at the first virtual host. Example:
<PRE CLASS="verbatim">{acl, tests, {user_regexp, "^test[0-9]*$"}}.
</PRE></DD><DT CLASS="dt-description"><B><TT>{user_regexp, &lt;regexp&gt;, &lt;server&gt;}</TT></B></DT><DD CLASS="dd-description"> Matches any user with a name
that matches <TT>&lt;regexp&gt;</TT> at server <TT>&lt;server&gt;</TT>. Example:
<PRE CLASS="verbatim">{acl, tests, {user_regexp, "^test", "example.org"}}.
</PRE></DD><DT CLASS="dt-description"><B><TT>{server_regexp, &lt;regexp&gt;}</TT></B></DT><DD CLASS="dd-description"> Matches any JID from the server that
matches <TT>&lt;regexp&gt;</TT>. Example:
<PRE CLASS="verbatim">{acl, icq, {server_regexp, "^icq\\."}}.
</PRE></DD><DT CLASS="dt-description"><B><TT>{node_regexp, &lt;user_regexp&gt;, &lt;server_regexp&gt;}</TT></B></DT><DD CLASS="dd-description"> Matches any user
with a name that matches <TT>&lt;user_regexp&gt;</TT> at any server that matches
<TT>&lt;server_regexp&gt;</TT>. Example:
<PRE CLASS="verbatim">{acl, yohzik, {node_regexp, "^yohzik$", "^example.(com|org)$"}}.
</PRE></DD><DT CLASS="dt-description"><B><TT>{user_glob, &lt;glob&gt;}</TT></B></DT><DD CLASS="dd-description">
</DD><DT CLASS="dt-description"><B><TT>{user_glob, &lt;glob&gt;, &lt;server&gt;}</TT></B></DT><DD CLASS="dd-description">
</DD><DT CLASS="dt-description"><B><TT>{server_glob, &lt;glob&gt;}</TT></B></DT><DD CLASS="dd-description">
</DD><DT CLASS="dt-description"><B><TT>{node_glob, &lt;user_glob&gt;, &lt;server_glob&gt;}</TT></B></DT><DD CLASS="dd-description"> This is the same as
above. However, it uses shell glob patterns instead of regexp. These patterns
can have the following special characters:
<DL CLASS="description"><DT CLASS="dt-description">
<B><TT>*</TT></B></DT><DD CLASS="dd-description"> matches any string including the null string.
</DD><DT CLASS="dt-description"><B><TT>?</TT></B></DT><DD CLASS="dd-description"> matches any single character.
</DD><DT CLASS="dt-description"><B><TT>[...]</TT></B></DT><DD CLASS="dd-description"> matches any of the enclosed characters. Character
ranges are specified by a pair of characters separated by a <TT>`-'</TT>.
If the first character after <TT>`['</TT> is a <TT>`!'</TT>, any
character not enclosed is matched.
</DD></DL>
</DD></DL><P>The following ACLs are pre-defined:
</P><DL CLASS="description"><DT CLASS="dt-description">
<B><TT>all</TT></B></DT><DD CLASS="dd-description"> Matches any JID.
</DD><DT CLASS="dt-description"><B><TT>none</TT></B></DT><DD CLASS="dd-description"> Matches no JID.
</DD></DL><!--TOC subsubsection Access Rights-->
<H4 CLASS="subsubsection"><!--SEC ANCHOR -->Access Rights</H4><!--SEC END --><P>
<A NAME="AccessRights"></A>
</P><P>An entry allowing or denying access to different services looks similar to
this:
</P><PRE CLASS="verbatim">  {access, &lt;accessname&gt;, [{allow, &lt;aclname&gt;},
                          {deny, &lt;aclname&gt;},
                          ...
                         ]}.
</PRE><P>When a JID is checked to have access to <TT>&lt;accessname&gt;</TT>, the server
sequentially checks if that JID mathes any of the ACLs that are named in the
second elements of the tuples in the list. If it matches, the first element of
the first matched tuple is returned, otherwise the value `<TT>deny</TT>' is
returned.</P><P>Example:
</P><PRE CLASS="verbatim">  {access, configure, [{allow, admin}]}.
  {access, something, [{deny, badmans},
                       {allow, all}]}.
</PRE><P>The following access rules are pre-defined:
</P><DL CLASS="description"><DT CLASS="dt-description">
<B><TT>all</TT></B></DT><DD CLASS="dd-description"> Always returns the value `<TT>allow</TT>'.
</DD><DT CLASS="dt-description"><B><TT>none</TT></B></DT><DD CLASS="dd-description"> Always returns the value `<TT>deny</TT>'.
</DD></DL><!--TOC subsubsection Limiting Opened Sessions with ACL-->
<H4 CLASS="subsubsection"><!--SEC ANCHOR -->Limiting Opened Sessions with ACL</H4><!--SEC END --><P>
<A NAME="configmaxsessions"></A>
</P><P>The special access <TT>max_users</TT> specifies the maximum number of sessions (authenticated
connections) per user. If a user tries to open more sessions by using different
resources, the first opened session will be disconnected. The error
<TT>session replaced</TT> will be sent to the disconnected session. The value
for this option can be either a number, or <TT>infinity</TT>. The default
value is <TT>infinity</TT>.</P><P>The syntax is:
</P><PRE CLASS="verbatim">  {access, max_user_sessions, [{&lt;maxnumber&gt;, &lt;aclname&gt;},
                               ...
                              ]}.
</PRE><P>Examples:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
To limit the number of sessions per user to 10 for all users:
<PRE CLASS="verbatim">  {access, max_user_sessions, [{10, all}]}.
</PRE></LI></UL><!--TOC subsection Shapers-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc21">3.1.6</A>&#XA0;&#XA0;Shapers</H3><!--SEC END --><P>
<A NAME="shapers"></A>
</P><P>Shapers enable you to limit connection traffic. The syntax of
shapers is like this:
</P><PRE CLASS="verbatim">  {shaper, &lt;shapername&gt;, &lt;kind&gt;}.
</PRE><P>Currently only one kind of shaper called <TT>maxrate</TT> is available. It has the
following syntax:
</P><PRE CLASS="verbatim">  {maxrate, &lt;rate&gt;}
</PRE><P>where <TT>&lt;rate&gt;</TT> stands for the maximum allowed incomig rate in bytes per
second.</P><P>Examples:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
To define a shaper named `<TT>normal</TT>' with traffic speed limited to
1,000&#XA0;bytes/second:
<PRE CLASS="verbatim">  {shaper, normal, {maxrate, 1000}}.
</PRE></LI><LI CLASS="li-itemize">To define a shaper named `<TT>fast</TT>' with traffic speed limited to
50,000&#XA0;bytes/second:
<PRE CLASS="verbatim">  {shaper, fast, {maxrate, 50000}}.
</PRE></LI></UL><!--TOC subsection Default Language-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc22">3.1.7</A>&#XA0;&#XA0;Default Language</H3><!--SEC END --><P>
<A NAME="language"></A>
</P><P>The option <TT>language</TT> defines the default language of server strings that
can be seen by Jabber clients. If a Jabber client do not support
<TT>xml:lang</TT>, the specified language is used. The default value is
<TT>en</TT>. In order to take effect there must be a translation file
<TT>&lt;language&gt;.msg</TT> in <TT>ejabberd</TT>'s <TT>msgs</TT> directory.</P><P>Examples:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
To set Russian as default language:
<PRE CLASS="verbatim">  {language, "ru"}.
</PRE></LI><LI CLASS="li-itemize">To set Spanish as default language:
<PRE CLASS="verbatim">  {language, "es"}.
</PRE></LI></UL><!--TOC section Database and LDAP Configuration-->
<H2 CLASS="section"><!--SEC ANCHOR --><A NAME="htoc23">3.2</A>&#XA0;&#XA0;Database and LDAP Configuration</H2><!--SEC END --><P>
<A NAME="database"></A>

</P><P><TT>ejabberd</TT> uses its internal Mnesia database by default. However, it is
possible to use a relational database or an LDAP server to store persistant,
long-living data. <TT>ejabberd</TT> is very flexible: you can configure different
authentication methods for different virtual hosts, you can configure different
authentication mechanisms for the same virtual host (fallback), you can set
different storage systems for modules, and so forth.</P><P>The following databases are supported by <TT>ejabberd</TT>:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
<A HREF="http://www.microsoft.com/sql/">Microsoft SQL Server</A>
</LI><LI CLASS="li-itemize"><A HREF="http://www.erlang.org/doc/doc-5.5.1/lib/mnesia-4.3.2/doc/">Mnesia</A>
</LI><LI CLASS="li-itemize"><A HREF="http://mysql.com/">MySQL</A>
</LI><LI CLASS="li-itemize"><A HREF="http://en.wikipedia.org/wiki/Open_Database_Connectivity">Any ODBC compatible database</A>
</LI><LI CLASS="li-itemize"><A HREF="http://www.postgresql.org/">PostgreSQL</A>
</LI></UL><P>The following LDAP servers are tested with <TT>ejabberd</TT>:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
<A HREF="http://www.microsoft.com/activedirectory/">Active Directory</A>
(see section&#XA0;<A HREF="#ad">3.2.5</A>)
</LI><LI CLASS="li-itemize"><A HREF="http://www.openldap.org/">OpenLDAP</A>
</LI><LI CLASS="li-itemize">Normally any LDAP compatible server should work; inform us about your
success with a not-listed server so that we can list it here.
</LI></UL><!--TOC subsection MySQL-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc24">3.2.1</A>&#XA0;&#XA0;MySQL</H3><!--SEC END --><P>
<A NAME="mysql"></A>
</P><P>Although this section will describe <TT>ejabberd</TT>'s configuration when you want to
use the native MySQL driver, it does not describe MySQL's installation and
database creation. Check the MySQL documentation and the tutorial <A HREF="http://support.process-one.net/doc/display/MESSENGER/Using+ejabberd+with+MySQL+native+driver">Using ejabberd with MySQL native driver</A> for information regarding these topics.
Note that the tutorial contains information about <TT>ejabberd</TT>'s configuration
which is duplicate to this section.</P><P>Moreover, the file mysql.sql in the directory src/odbc might be interesting for
you. This file contains the ejabberd schema for MySQL. At the end of the file
you can find information to update your database schema.</P><!--TOC subsubsection Driver Compilation-->
<H4 CLASS="subsubsection"><!--SEC ANCHOR -->Driver Compilation</H4><!--SEC END --><P>
<A NAME="compilemysql"></A>
</P><P>You can skip this step if you installed <TT>ejabberd</TT> using a binary installer or
if the binary packages of <TT>ejabberd</TT> you are using include support for MySQL.</P><OL CLASS="enumerate" type=1><LI CLASS="li-enumerate">
First, install the <A HREF="http://support.process-one.net/doc/display/CONTRIBS/Yxa">Erlang
MySQL library</A>. Make sure the compiled files are in your Erlang path; you can
put them for example in the same directory as your ejabberd .beam files.
</LI><LI CLASS="li-enumerate">Then, configure and install <TT>ejabberd</TT> with ODBC support enabled (this is
also needed for native MySQL support!). This can be done, by using next
commands:
<PRE CLASS="verbatim">./configure --enable-odbc &amp;&amp; make install
</PRE></LI></OL><!--TOC subsubsection Authentication-->
<H4 CLASS="subsubsection"><!--SEC ANCHOR -->Authentication</H4><!--SEC END --><P>
<A NAME="mysqlauth"></A>
</P><P>The option value name may be misleading, as the <TT>auth_method</TT> name is used
for access to a relational database through ODBC, as well as through the native
MySQL interface. Anyway, the first configuration step is to define the odbc
<TT>auth_method</TT>. For example:
</P><PRE CLASS="verbatim">{host_config, "public.example.org", [{auth_method, [odbc]}]}.
</PRE><P>The actual database access is defined in the option <TT>odbc_server</TT>. Its
value is used to define if we want to use ODBC, or one of the two native
interface available, PostgreSQL or MySQL.</P><P>To use the native MySQL interface, you can pass a tuple of the following form as
parameter:
</P><PRE CLASS="verbatim">{mysql, "Server", "Database", "Username", "Password"}
</PRE><P><TT>mysql</TT> is a keyword that should be kept as is. For example:
</P><PRE CLASS="verbatim">{odbc_server, {mysql, "localhost", "test", "root", "password"}}.
</PRE><P>Optionally, it is possible to define the MySQL port to use. This
option is only useful, in very rare cases, when you are not running
MySQL with the default port setting. The <TT>mysql</TT> parameter
can thus take the following form:
</P><PRE CLASS="verbatim">{mysql, "Server", Port, "Database", "Username", "Password"}
</PRE><P>The <TT>Port</TT> value should be an integer, without quotes. For example:
</P><PRE CLASS="verbatim">{odbc_server, {mysql, "localhost", Port, "test", "root", "password"}}.
</PRE><!--TOC subsubsection Storage-->
<H4 CLASS="subsubsection"><!--SEC ANCHOR -->Storage</H4><!--SEC END --><P>
<A NAME="mysqlstorage"></A>
</P><P>MySQL also can be used to store information into from several <TT>ejabberd</TT>
modules. See section&#XA0;<A HREF="#modoverview">3.3.1</A> to see which modules have a version
with the `_odbc'. This suffix indicates that the module can be used with
relational databases like MySQL. To enable storage to your database, just make
sure that your database is running well (see previous sections), and replace the
suffix-less or ldap module variant with the odbc module variant. Keep in mind
that you cannot have several variants of the same module loaded!</P><!--TOC subsection Microsoft SQL Server-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc25">3.2.2</A>&#XA0;&#XA0;Microsoft SQL Server</H3><!--SEC END --><P>
<A NAME="mssql"></A>
</P><P>Although this section will describe <TT>ejabberd</TT>'s configuration when you want to
use Microsoft SQL Server, it does not describe Microsoft SQL Server's
installation and database creation. Check the MySQL documentation and the
tutorial <A HREF="http://support.process-one.net/doc/display/MESSENGER/Using+ejabberd+with+MySQL+native+driver">Using ejabberd with MySQL native driver</A> for information regarding these topics.
Note that the tutorial contains information about <TT>ejabberd</TT>'s configuration
which is duplicate to this section.</P><P>Moreover, the file mssql.sql in the directory src/odbc might be interesting for
you. This file contains the ejabberd schema for Microsoft SQL Server. At the end
of the file you can find information to update your database schema.</P><!--TOC subsubsection Driver Compilation-->
<H4 CLASS="subsubsection"><!--SEC ANCHOR -->Driver Compilation</H4><!--SEC END --><P>
<A NAME="compilemssql"></A>
</P><P>You can skip this step if you installed <TT>ejabberd</TT> using a binary installer or
if the binary packages of <TT>ejabberd</TT> you are using include support for ODBC.</P><P>If you want to use Microsoft SQL Server with ODBC, you need to configure,
compile and install <TT>ejabberd</TT> with support for ODBC and Microsoft SQL Server
enabled. This can be done, by using next commands:
</P><PRE CLASS="verbatim">./configure --enable-odbc --enable-mssql &amp;&amp; make install
</PRE><!--TOC subsubsection Authentication-->
<H4 CLASS="subsubsection"><!--SEC ANCHOR -->Authentication</H4><!--SEC END --><P>
<A NAME="mssqlauth"></A>
</P><P>The configuration of Microsoft SQL Server is the same as the configuration of
ODBC compatible serers (see section&#XA0;<A HREF="#odbcauth">3.2.4</A>).</P><!--TOC subsubsection Storage-->
<H4 CLASS="subsubsection"><!--SEC ANCHOR -->Storage</H4><!--SEC END --><P>
<A NAME="mssqlstorage"></A>
</P><P>Microsoft SQL Server also can be used to store information into from several
<TT>ejabberd</TT> modules. See section&#XA0;<A HREF="#modoverview">3.3.1</A> to see which modules have
a version with the `_odbc'. This suffix indicates that the module can be used
with relational databases like Microsoft SQL Server. To enable storage to your
database, just make sure that your database is running well (see previous
sections), and replace the suffix-less or ldap module variant with the odbc
module variant. Keep in mind that you cannot have several variants of the same
module loaded!</P><!--TOC subsection PostgreSQL-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc26">3.2.3</A>&#XA0;&#XA0;PostgreSQL</H3><!--SEC END --><P>
<A NAME="pgsql"></A>
</P><P>Although this section will describe <TT>ejabberd</TT>'s configuration when you want to
use the native PostgreSQL driver, it does not describe PostgreSQL's installation
and database creation. Check the PostgreSQL documentation and the tutorial <A HREF="http://support.process-one.net/doc/display/MESSENGER/Using+ejabberd+with+MySQL+native+driver">Using ejabberd with MySQL native driver</A> for information regarding these topics.
Note that the tutorial contains information about <TT>ejabberd</TT>'s configuration
which is duplicate to this section.</P><P>Also the file pg.sql in the directory src/odbc might be interesting for you.
This file contains the ejabberd schema for PostgreSQL. At the end of the file
you can find information to update your database schema.</P><!--TOC subsubsection Driver Compilation-->
<H4 CLASS="subsubsection"><!--SEC ANCHOR -->Driver Compilation</H4><!--SEC END --><P>
<A NAME="compilepgsql"></A>
</P><P>You can skip this step if you installed <TT>ejabberd</TT> using a binary installer or
if the binary packages of <TT>ejabberd</TT> you are using include support for
PostgreSQL.</P><OL CLASS="enumerate" type=1><LI CLASS="li-enumerate">
First, install the Erlang PgSQL library from
<A HREF="http://jungerl.sourceforge.net/">Jungerl</A>. Make sure the compiled
files are in your Erlang path; you can put them for example in the same
directory as your ejabberd .beam files.
</LI><LI CLASS="li-enumerate">Then, configure, compile and install <TT>ejabberd</TT> with ODBC support enabled
(this is also needed for native PostgreSQL support!). This can be done, by
using next commands:
<PRE CLASS="verbatim">./configure --enable-odbc &amp;&amp; make install
</PRE></LI></OL><!--TOC subsubsection Authentication-->
<H4 CLASS="subsubsection"><!--SEC ANCHOR -->Authentication</H4><!--SEC END --><P>
<A NAME="pgsqlauth"></A>
</P><P>The option value name may be misleading, as the <TT>auth_method</TT> name is used
for access to a relational database through ODBC, as well as through the native
PostgreSQL interface. Anyway, the first configuration step is to define the odbc
<TT>auth_method</TT>. For example:
</P><PRE CLASS="verbatim">{host_config, "public.example.org", [{auth_method, [odbc]}]}.
</PRE><P>The actual database access is defined in the option <TT>odbc_server</TT>. Its
value is used to define if we want to use ODBC, or one of the two native
interface available, PostgreSQL or MySQL.</P><P>To use the native PostgreSQL interface, you can pass a tuple of the following
form as parameter:
</P><PRE CLASS="verbatim">{pgsql, "Server", "Database", "Username", "Password"}
</PRE><P><TT>pgsql</TT> is a keyword that should be kept as is. For example:
</P><PRE CLASS="verbatim">{odbc_server, {pgsql, "localhost", "database", "ejabberd", "password"}}.
</PRE><P>Optionally, it is possible to define the PostgreSQL port to use. This
option is only useful, in very rare cases, when you are not running
PostgreSQL with the default port setting. The <TT>pgsql</TT> parameter
can thus take the following form:
</P><PRE CLASS="verbatim">{pgsql, "Server", Port, "Database", "Username", "Password"}
</PRE><P>The <TT>Port</TT> value should be an integer, without quotes. For example:
</P><PRE CLASS="verbatim">{odbc_server, {pgsql, "localhost", 5432, "database", "ejabberd", "password"}}.
</PRE><!--TOC subsubsection Storage-->
<H4 CLASS="subsubsection"><!--SEC ANCHOR -->Storage</H4><!--SEC END --><P>
<A NAME="pgsqlstorage"></A>
</P><P>PostgreSQL also can be used to store information into from several <TT>ejabberd</TT>
modules. See section&#XA0;<A HREF="#modoverview">3.3.1</A> to see which modules have a version
with the `_odbc'. This suffix indicates that the module can be used with
relational databases like PostgreSQL. To enable storage to your database, just
make sure that your database is running well (see previous sections), and
replace the suffix-less or ldap module variant with the odbc module variant.
Keep in mind that you cannot have several variants of the same module loaded!</P><!--TOC subsection ODBC Compatible-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc27">3.2.4</A>&#XA0;&#XA0;ODBC Compatible</H3><!--SEC END --><P>
<A NAME="odbc"></A>
</P><P>Although this section will describe <TT>ejabberd</TT>'s configuration when you want to
use the ODBC driver, it does not describe the installation and database creation
of your database. Check the documentation of your database. The tutorial <A HREF="http://support.process-one.net/doc/display/MESSENGER/Using+ejabberd+with+MySQL+native+driver">Using ejabberd with MySQL native driver</A> also can help you. Note that the tutorial
contains information about <TT>ejabberd</TT>'s configuration which is duplicate to
this section.</P><!--TOC subsubsection Compilation-->
<H4 CLASS="subsubsection"><!--SEC ANCHOR -->Compilation</H4><!--SEC END --><P>
<A NAME="compileodbc"></A></P><P>You can skip this step if you installed <TT>ejabberd</TT> using a binary installer or
if the binary packages of <TT>ejabberd</TT> you are using include support for
ODBC.</P><OL CLASS="enumerate" type=1><LI CLASS="li-enumerate">
First, install the <A HREF="http://support.process-one.net/doc/display/CONTRIBS/Yxa">Erlang
MySQL library</A>. Make sure the compiled files are in your Erlang path; you can
put them for example in the same directory as your ejabberd .beam files.
</LI><LI CLASS="li-enumerate">Then, configure, compile and install <TT>ejabberd</TT> with ODBC support
enabled. This can be done, by using next commands:
<PRE CLASS="verbatim">./configure --enable-odbc &amp;&amp; make install
</PRE></LI></OL><!--TOC subsubsection Authentication-->
<H4 CLASS="subsubsection"><!--SEC ANCHOR -->Authentication</H4><!--SEC END --><P>
<A NAME="odbcauth"></A>
</P><P>The first configuration step is to define the odbc <TT>auth_method</TT>. For
example:
</P><PRE CLASS="verbatim">{host_config, "public.example.org", [{auth_method, [odbc]}]}.
</PRE><P>The actual database access is defined in the option <TT>odbc_server</TT>. Its
value is used to defined if we want to use ODBC, or one of the two native
interface available, PostgreSQL or MySQL.</P><P>To use a relational database through ODBC, you can pass the ODBC connection
string as <TT>odbc_server</TT> parameter. For example:
</P><PRE CLASS="verbatim">{odbc_server, "DSN=database;UID=ejabberd;PWD=password"}.
</PRE><!--TOC subsubsection Storage-->
<H4 CLASS="subsubsection"><!--SEC ANCHOR -->Storage</H4><!--SEC END --><P>
<A NAME="odbcstorage"></A>
</P><P>An ODBC compatible database also can be used to store information into from
several <TT>ejabberd</TT> modules. See section&#XA0;<A HREF="#modoverview">3.3.1</A> to see which
modules have a version with the `_odbc'. This suffix indicates that the module
can be used with ODBC compatible relational databases. To enable storage to your
database, just make sure that your database is running well (see previous
sections), and replace the suffix-less or ldap module variant with the odbc
module variant. Keep in mind that you cannot have several variants of the same
module loaded!</P><!--TOC subsection LDAP-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc28">3.2.5</A>&#XA0;&#XA0;LDAP</H3><!--SEC END --><P>
<A NAME="ldap"></A>
</P><P><TT>ejabberd</TT> has built-in LDAP support. You can authenticate users against LDAP
server and use LDAP directory as vCard storage. Shared rosters are not supported
yet.</P><!--TOC subsubsection Connection-->
<H4 CLASS="subsubsection"><!--SEC ANCHOR -->Connection</H4><!--SEC END --><P>
<A NAME="ldapconnection"></A></P><P>Parameters:
</P><DL CLASS="description"><DT CLASS="dt-description">
<B><TT>ldap_server</TT></B></DT><DD CLASS="dd-description"> IP address or dns name of your
LDAP server. This option is required.
</DD><DT CLASS="dt-description"><B><TT>ldap_port</TT></B></DT><DD CLASS="dd-description"> Port to connect to your LDAP server.
The default value is&#XA0;389.
</DD><DT CLASS="dt-description"><B><TT>ldap_rootdn</TT></B></DT><DD CLASS="dd-description"> Bind DN. The default value
is&#XA0;<TT>""</TT> which means `anonymous connection'.
</DD><DT CLASS="dt-description"><B><TT>ldap_password</TT></B></DT><DD CLASS="dd-description"> Bind password. The default
value is <TT>""</TT>.
</DD></DL><P>Example:
</P><PRE CLASS="verbatim">  {auth_method, ldap}.
  {ldap_servers, ["ldap.example.org"]}.
  {ldap_port, 389}.
  {ldap_rootdn, "cn=Manager,dc=domain,dc=org"}.
  {ldap_password, "secret"}.
</PRE><P>Note that current LDAP implementation does not support SSL secured communication
and SASL authentication.</P><!--TOC subsubsection Authentication-->
<H4 CLASS="subsubsection"><!--SEC ANCHOR -->Authentication</H4><!--SEC END --><P>
<A NAME="ldapauth"></A></P><P>You can authenticate users against an LDAP directory. Available options are:</P><DL CLASS="description"><DT CLASS="dt-description">
<B><TT>ldap_base</TT></B></DT><DD CLASS="dd-description">LDAP base directory which stores
users accounts. This option is required.
</DD><DT CLASS="dt-description"><B><TT>ldap_uids</TT></B></DT><DD CLASS="dd-description">LDAP attribute which holds a list
of attributes to use as alternatives for getting the JID. The value is of
the form: <TT>[{ldap_uidattr}]</TT> or <TT>[{ldap_uidattr,
ldap_uidattr_format}]</TT>. You can use as many comma separated tuples
<TT>{ldap_uidattr, ldap_uidattr_format}</TT> that is needed. The default
value is <TT>[{"uid", "%u"}]</TT>. The defaut <TT>ldap_uidattr_format</TT>
is <TT>"%u"</TT>. The values for <TT>ldap_uidattr</TT> and
<TT>ldap_uidattr_format</TT> are described as follow:
<DL CLASS="description"><DT CLASS="dt-description">
<B><TT>ldap_uidattr</TT></B></DT><DD CLASS="dd-description">LDAP attribute which holds
the user's part of a JID. The default value is <TT>"uid"</TT>.
</DD><DT CLASS="dt-description"><B><TT>ldap_uidattr_format</TT></B></DT><DD CLASS="dd-description">Format of
the <TT>ldap_uidattr</TT> variable. The format <EM>must</EM> contain one and
only one pattern variable <TT>"%u"</TT> which will be replaced by the
user's part of a JID. For example, <TT>"%u@example.org"</TT>. The default
value is <TT>"%u"</TT>.
</DD></DL>
</DD><DT CLASS="dt-description"><B><TT>ldap_filter</TT></B></DT><DD CLASS="dd-description">
<A HREF="http://www.faqs.org/rfcs/rfc2254.html">RFC 2254</A> LDAP filter. The
default is <TT>none</TT>. Example:
<TT>"(&amp;(objectClass=shadowAccount)(memberOf=Jabber Users))"</TT>. Please, do
not forget to close brackets and do not use superfluous whitespaces. Also you
<EM>must not</EM> use <TT>ldap_uidattr</TT> attribute in filter because this
attribute will be substituted in LDAP filter automatically.
</DD></DL><!--TOC subsubsection Examples-->
<H4 CLASS="subsubsection"><!--SEC ANCHOR -->Examples</H4><!--SEC END --><P>
<A NAME="ldapexamples"></A></P><!--TOC paragraph Common example-->
<H5 CLASS="paragraph"><!--SEC ANCHOR --><A NAME="ldapcommonexample">Common example</A></H5><!--SEC END --><P>Let's say <TT>ldap.example.org</TT> is the name of our LDAP server. We have
users with their passwords in <TT>"ou=Users,dc=example,dc=org"</TT> directory.
Also we have addressbook, which contains users emails and their additional
infos in <TT>"ou=AddressBook,dc=example,dc=org"</TT> directory. Corresponding
authentication section should looks like this:</P><PRE CLASS="verbatim">  %% authentication method
  {auth_method, ldap}.
  %% DNS name of our LDAP server
  {ldap_servers, ["ldap.example.org"]}.
  %% Bind to LDAP server as "cn=Manager,dc=example,dc=org" with password "secret"
  {ldap_rootdn, "cn=Manager,dc=example,dc=org"}.
  {ldap_password, "secret"}.
  %% define the user's base
  {ldap_base, "ou=Users,dc=example,dc=org"}.
  %% We want to authorize users from 'shadowAccount' object class only
  {ldap_filter, "(objectClass=shadowAccount)"}.
</PRE><P>Now we want to use users LDAP-info as their vCards. We have four attributes
defined in our LDAP schema: <TT>"mail"</TT> &#X2014; email address, <TT>"givenName"</TT>
&#X2014; first name, <TT>"sn"</TT> &#X2014; second name, <TT>"birthDay"</TT> &#X2014; birthday.
Also we want users to search each other. Let's see how we can set it up:</P><PRE CLASS="verbatim">  {modules,
    ...
    {mod_vcard_ldap,
     [
      %% We use the same server and port, but want to bind anonymously because
      %% our LDAP server accepts anonymous requests to
      %% "ou=AddressBook,dc=example,dc=org" subtree.
      {ldap_rootdn, ""},
      {ldap_password, ""},
      %% define the addressbook's base
      {ldap_base, "ou=AddressBook,dc=example,dc=org"},
      %% uidattr: user's part of JID is located in the "mail" attribute
      %% uidattr_format: common format for our emails
      {ldap_uids, [{"mail", "%u@mail.example.org"}]},
      %% We have to define empty filter here, because entries in addressbook does not
      %% belong to shadowAccount object class
      {ldap_filter, ""},
      %% Now we want to define vCard pattern
      {ldap_vcard_map,
       [{"NICKNAME", "%u", []}, % just use user's part of JID as his nickname
        {"GIVEN", "%s", ["givenName"]},
        {"FAMILY", "%s", ["sn"]},
        {"FN", "%s, %s", ["sn", "givenName"]}, % example: "Smith, John"
        {"EMAIL", "%s", ["mail"]},
        {"BDAY", "%s", ["birthDay"]}]},
      %% Search form
      {ldap_search_fields,
       [{"User", "%u"},
        {"Name", "givenName"},
        {"Family Name", "sn"},
        {"Email", "mail"},
        {"Birthday", "birthDay"}]},
      %% vCard fields to be reported
      %% Note that JID is always returned with search results
      {ldap_search_reported,
       [{"Full Name", "FN"},
        {"Nickname", "NICKNAME"},
        {"Birthday", "BDAY"}]}
    ]},
    ...
  }.
</PRE><P>Note that <TT>mod_vcard_ldap</TT> module checks for the existence of the user before
searching in his information in LDAP.</P><!--TOC paragraph Active Directory-->
<H5 CLASS="paragraph"><!--SEC ANCHOR -->Active Directory</H5><!--SEC END --><P>
<A NAME="ad"></A>
</P><P>Active Directory is just an LDAP-server with predefined attributes. A sample
configuration is shown below:</P><PRE CLASS="verbatim">  {auth_method, ldap}.
  {ldap_servers, ["office.org"]}.    % List of LDAP servers
  {ldap_base, "DC=office,DC=org"}. % Search base of LDAP directory
  {ldap_rootdn, "CN=Administrator,CN=Users,DC=office,DC=org"}. % LDAP manager
  {ldap_password, "*******"}. % Password to LDAP manager
  {ldap_uids, [{"sAMAccountName"}]}.
  {ldap_filter, "(memberOf=*)"}.

  {modules,
    ...
    {mod_vcard_ldap,
     [{ldap_vcard_map,
       [{"NICKNAME", "%u", []},
        {"GIVEN", "%s", ["givenName"]},
        {"MIDDLE", "%s", ["initials"]},
        {"FAMILY", "%s", ["sn"]},
        {"FN", "%s", ["displayName"]},
        {"EMAIL", "%s", ["mail"]},
        {"ORGNAME", "%s", ["company"]},
        {"ORGUNIT", "%s", ["department"]},
        {"CTRY", "%s", ["c"]},
        {"LOCALITY", "%s", ["l"]},
        {"STREET", "%s", ["streetAddress"]},
        {"REGION", "%s", ["st"]},
        {"PCODE", "%s", ["postalCode"]},
        {"TITLE", "%s", ["title"]},
        {"URL", "%s", ["wWWHomePage"]},
        {"DESC", "%s", ["description"]},
        {"TEL", "%s", ["telephoneNumber"]}]},
      {ldap_search_fields,
       [{"User", "%u"},
        {"Name", "givenName"},
        {"Family Name", "sn"},
        {"Email", "mail"},
        {"Company", "company"},
        {"Department", "department"},
        {"Role", "title"},
        {"Description", "description"},
        {"Phone", "telephoneNumber"}]},
      {ldap_search_reported,
       [{"Full Name", "FN"},
        {"Nickname", "NICKNAME"},
        {"Email", "EMAIL"}]}
    ]},
    ...
  }.
</PRE><!--TOC section Modules Configuration-->
<H2 CLASS="section"><!--SEC ANCHOR --><A NAME="htoc29">3.3</A>&#XA0;&#XA0;Modules Configuration</H2><!--SEC END --><P>
<A NAME="modules"></A>
</P><P>The option <TT>modules</TT> defines the list of modules that will be loaded after
<TT>ejabberd</TT>'s startup. Each entry in the list is a tuple in which the first
element is the name of a module and the second is a list of options for that
module.</P><P>Examples:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
In this example only the module <TT>mod_echo</TT> is loaded and no module
options are specified between the square brackets:
<PRE CLASS="verbatim">  {modules,
   [{mod_echo,      []}
   ]}.
</PRE></LI><LI CLASS="li-itemize">In the second example the modules <TT>mod_echo</TT>, <TT>mod_time</TT>, and
<TT>mod_version</TT> are loaded without options. Remark that, besides the last entry,
all entries end with a comma:
<PRE CLASS="verbatim">  {modules,
   [{mod_echo,      []},
    {mod_time,      []},
    {mod_version,   []}
   ]}.
</PRE></LI></UL><!--TOC subsection Overview-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc30">3.3.1</A>&#XA0;&#XA0;Overview</H3><!--SEC END --><P>
<A NAME="modoverview"></A>
</P><P>The following table lists all modules available in the official <TT>ejabberd</TT>
distribution. You can find more
<A HREF="http://ejabberd.jabber.ru/contributions">contributed modules</A> on the
<TT>ejabberd</TT> website. Please remember that these contributions might not work or
that they can contain severe bugs and security leaks. Therefore, use them at
your own risk!</P><P>You can see which database backend each module needs by looking at the suffix:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
`_ldap', this means that the module needs an LDAP server as backend.
</LI><LI CLASS="li-itemize">`_odbc', this means that the module needs a supported database
(see&#XA0;<A HREF="#database">3.2</A>) as backend.
</LI><LI CLASS="li-itemize">No suffix, this means that the modules uses Erlang's built-in database
Mnesia as backend.
</LI></UL><P>If you want to
It is possible to use a relational database to store pieces of
information. You can do this by changing the module name to a name with an
<TT>_odbc</TT> suffix in <TT>ejabberd</TT> config file. You can use a relational
database for the following data:</P><UL CLASS="itemize"><LI CLASS="li-itemize">
Last connection date and time: Use <TT>mod_last_odbc</TT> instead of
<TT>mod_last</TT>.
</LI><LI CLASS="li-itemize">Offline messages: Use <TT>mod_offline_odbc</TT> instead of
<TT>mod_offline</TT>.
</LI><LI CLASS="li-itemize">Rosters: Use <TT>mod_roster_odbc</TT> instead of <TT>mod_roster</TT>.
</LI><LI CLASS="li-itemize">Users' VCARD: Use <TT>mod_vcard_odbc</TT> instead of <TT>mod_vcard</TT>.
</LI></UL><BLOCKQUOTE CLASS="table"><DIV CLASS="center"><DIV CLASS="center"><HR WIDTH="80%" SIZE=2></DIV>
<TABLE BORDER=1 CELLSPACING=0 CELLPADDING=1><TR><TD ALIGN=left NOWRAP>Module</TD><TD ALIGN=left NOWRAP>Feature</TD><TD ALIGN=left NOWRAP>Dependencies</TD><TD ALIGN=left NOWRAP>Needed for XMPP?</TD></TR>
<TR><TD ALIGN=left NOWRAP><TT>mod_adhoc</TT></TD><TD ALIGN=left NOWRAP>Ad-Hoc Commands (<A HREF="http://www.xmpp.org/extensions/xep-0050.html">XEP-0050</A>)</TD><TD ALIGN=left NOWRAP>&nbsp;</TD><TD ALIGN=left NOWRAP>No</TD></TR>
<TR><TD ALIGN=left NOWRAP><TT>mod_announce</TT></TD><TD ALIGN=left NOWRAP>Manage announcements</TD><TD ALIGN=left NOWRAP><TT>mod_adhoc</TT></TD><TD ALIGN=left NOWRAP>No</TD></TR>
<TR><TD ALIGN=left NOWRAP><TT>mod_configure</TT></TD><TD ALIGN=left NOWRAP>Support for online</TD><TD ALIGN=left NOWRAP><TT>mod_adhoc</TT></TD><TD ALIGN=left NOWRAP>No</TD></TR>
<TR><TD ALIGN=left NOWRAP>&nbsp;</TD><TD ALIGN=left NOWRAP>configuration of <TT>ejabberd</TT></TD><TD ALIGN=left NOWRAP>&nbsp;</TD><TD ALIGN=left NOWRAP>&nbsp;</TD></TR>
<TR><TD ALIGN=left NOWRAP><TT>mod_disco</TT></TD><TD ALIGN=left NOWRAP>Service Discovery (<A HREF="http://www.xmpp.org/extensions/xep-0030.html">XEP-0030</A>)</TD><TD ALIGN=left NOWRAP>&nbsp;</TD><TD ALIGN=left NOWRAP>No</TD></TR>
<TR><TD ALIGN=left NOWRAP><TT>mod_echo</TT></TD><TD ALIGN=left NOWRAP>Echoes Jabber packets</TD><TD ALIGN=left NOWRAP>&nbsp;</TD><TD ALIGN=left NOWRAP>No</TD></TR>
<TR><TD ALIGN=left NOWRAP><TT>mod_irc</TT></TD><TD ALIGN=left NOWRAP>IRC transport</TD><TD ALIGN=left NOWRAP>&nbsp;</TD><TD ALIGN=left NOWRAP>No</TD></TR>
<TR><TD ALIGN=left NOWRAP><TT>mod_last</TT></TD><TD ALIGN=left NOWRAP>Last Activity (<A HREF="http://www.xmpp.org/extensions/xep-0012.html">XEP-0012</A>)</TD><TD ALIGN=left NOWRAP>&nbsp;</TD><TD ALIGN=left NOWRAP>No</TD></TR>
<TR><TD ALIGN=left NOWRAP><TT>mod_last_odbc</TT></TD><TD ALIGN=left NOWRAP>Last Activity (<A HREF="http://www.xmpp.org/extensions/xep-0012.html">XEP-0012</A>)</TD><TD ALIGN=left NOWRAP>supported database (*)</TD><TD ALIGN=left NOWRAP>No</TD></TR>
<TR><TD ALIGN=left NOWRAP><TT>mod_muc</TT></TD><TD ALIGN=left NOWRAP>Multi-User Chat (<A HREF="http://www.xmpp.org/extensions/xep-0045.html">XEP-0045</A>)</TD><TD ALIGN=left NOWRAP>&nbsp;</TD><TD ALIGN=left NOWRAP>No</TD></TR>
<TR><TD ALIGN=left NOWRAP><TT>mod_muc_log</TT></TD><TD ALIGN=left NOWRAP>Multi-User Chat room logging</TD><TD ALIGN=left NOWRAP><TT>mod_muc</TT></TD><TD ALIGN=left NOWRAP>No</TD></TR>
<TR><TD ALIGN=left NOWRAP><TT>mod_offline</TT></TD><TD ALIGN=left NOWRAP>Offline message storage</TD><TD ALIGN=left NOWRAP>&nbsp;</TD><TD ALIGN=left NOWRAP>No</TD></TR>
<TR><TD ALIGN=left NOWRAP><TT>mod_offline_odbc</TT></TD><TD ALIGN=left NOWRAP>Offline message storage</TD><TD ALIGN=left NOWRAP>supported database (*)</TD><TD ALIGN=left NOWRAP>No</TD></TR>
<TR><TD ALIGN=left NOWRAP><TT>mod_privacy</TT></TD><TD ALIGN=left NOWRAP>Blocking Communication</TD><TD ALIGN=left NOWRAP>&nbsp;</TD><TD ALIGN=left NOWRAP>Yes</TD></TR>
<TR><TD ALIGN=left NOWRAP><TT>mod_private</TT></TD><TD ALIGN=left NOWRAP>Private XML Storage (<A HREF="http://www.xmpp.org/extensions/xep-0049.html">XEP-0049</A>)</TD><TD ALIGN=left NOWRAP>&nbsp;</TD><TD ALIGN=left NOWRAP>No</TD></TR>
<TR><TD ALIGN=left NOWRAP><TT>mod_private_odbc</TT></TD><TD ALIGN=left NOWRAP>Private XML Storage (<A HREF="http://www.xmpp.org/extensions/xep-0049.html">XEP-0049</A>)</TD><TD ALIGN=left NOWRAP>supported database (*)</TD><TD ALIGN=left NOWRAP>No</TD></TR>
<TR><TD ALIGN=left NOWRAP><TT>mod_proxy65</TT></TD><TD ALIGN=left NOWRAP>SOCKS5 Bytestreams (<A HREF="http://www.xmpp.org/extensions/xep-0065.html">XEP-0065</A>)</TD><TD ALIGN=left NOWRAP>&nbsp;</TD><TD ALIGN=left NOWRAP>No</TD></TR>
<TR><TD ALIGN=left NOWRAP><TT>mod_pubsub</TT></TD><TD ALIGN=left NOWRAP>Publish-Subscribe (<A HREF="http://www.xmpp.org/extensions/xep-0060.html">XEP-0060</A>)</TD><TD ALIGN=left NOWRAP>&nbsp;</TD><TD ALIGN=left NOWRAP>No</TD></TR>
<TR><TD ALIGN=left NOWRAP><TT>mod_register</TT></TD><TD ALIGN=left NOWRAP>In-Band Registration (<A HREF="http://www.xmpp.org/extensions/xep-0077.html">XEP-0077</A>)</TD><TD ALIGN=left NOWRAP>&nbsp;</TD><TD ALIGN=left NOWRAP>No</TD></TR>
<TR><TD ALIGN=left NOWRAP><TT>mod_roster</TT></TD><TD ALIGN=left NOWRAP>Roster management</TD><TD ALIGN=left NOWRAP>&nbsp;</TD><TD ALIGN=left NOWRAP>Yes (**)</TD></TR>
<TR><TD ALIGN=left NOWRAP><TT>mod_roster_odbc</TT></TD><TD ALIGN=left NOWRAP>Roster management</TD><TD ALIGN=left NOWRAP>supported database (*)</TD><TD ALIGN=left NOWRAP>Yes (**)</TD></TR>
<TR><TD ALIGN=left NOWRAP><TT>mod_service_log</TT></TD><TD ALIGN=left NOWRAP>Copy user messages to logger service</TD><TD ALIGN=left NOWRAP>&nbsp;</TD><TD ALIGN=left NOWRAP>No</TD></TR>
<TR><TD ALIGN=left NOWRAP><TT>mod_shared_roster</TT></TD><TD ALIGN=left NOWRAP>Shared roster management</TD><TD ALIGN=left NOWRAP><TT>mod_roster</TT> or</TD><TD ALIGN=left NOWRAP>No</TD></TR>
<TR><TD ALIGN=left NOWRAP>&nbsp;</TD><TD ALIGN=left NOWRAP>&nbsp;</TD><TD ALIGN=left NOWRAP><TT>mod_roster_odbc</TT></TD><TD ALIGN=left NOWRAP>&nbsp;</TD></TR>
<TR><TD ALIGN=left NOWRAP><TT>mod_stats</TT></TD><TD ALIGN=left NOWRAP>Statistics Gathering (<A HREF="http://www.xmpp.org/extensions/xep-0039.html">XEP-0039</A>)</TD><TD ALIGN=left NOWRAP>&nbsp;</TD><TD ALIGN=left NOWRAP>No</TD></TR>
<TR><TD ALIGN=left NOWRAP><TT>mod_time</TT></TD><TD ALIGN=left NOWRAP>Entity Time (<A HREF="http://www.xmpp.org/extensions/xep-0090.html">XEP-0090</A>)</TD><TD ALIGN=left NOWRAP>&nbsp;</TD><TD ALIGN=left NOWRAP>No</TD></TR>
<TR><TD ALIGN=left NOWRAP><TT>mod_vcard</TT></TD><TD ALIGN=left NOWRAP>vcard-temp (<A HREF="http://www.xmpp.org/extensions/xep-0054.html">XEP-0054</A>)</TD><TD ALIGN=left NOWRAP>&nbsp;</TD><TD ALIGN=left NOWRAP>No</TD></TR>
<TR><TD ALIGN=left NOWRAP><TT>mod_vcard_ldap</TT></TD><TD ALIGN=left NOWRAP>vcard-temp (<A HREF="http://www.xmpp.org/extensions/xep-0054.html">XEP-0054</A>)</TD><TD ALIGN=left NOWRAP>LDAP server</TD><TD ALIGN=left NOWRAP>No</TD></TR>
<TR><TD ALIGN=left NOWRAP><TT>mod_vcard_odbc</TT></TD><TD ALIGN=left NOWRAP>vcard-temp (<A HREF="http://www.xmpp.org/extensions/xep-0054.html">XEP-0054</A>)</TD><TD ALIGN=left NOWRAP>supported database (*)</TD><TD ALIGN=left NOWRAP>No</TD></TR>
<TR><TD ALIGN=left NOWRAP><TT>mod_version</TT></TD><TD ALIGN=left NOWRAP>Software Version (<A HREF="http://www.xmpp.org/extensions/xep-0092.html">XEP-0092</A>)</TD><TD ALIGN=left NOWRAP>&nbsp;</TD><TD ALIGN=left NOWRAP>No</TD></TR>
</TABLE>
<DIV CLASS="center"><HR WIDTH="80%" SIZE=2></DIV></DIV></BLOCKQUOTE><UL CLASS="itemize"><LI CLASS="li-itemize">
(*) For a list of supported databases, see section&#XA0;<A HREF="#database">3.2</A>.
</LI><LI CLASS="li-itemize">(**) This module or a similar one with another database backend is needed for
XMPP compliancy.
</LI></UL><!--TOC subsection Common Options-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc31">3.3.2</A>&#XA0;&#XA0;Common Options</H3><!--SEC END --><P>
<A NAME="modcommonoptions"></A></P><P>The following options are used by many modules. Therefore, they are described in
this separate section.</P><!--TOC subsubsection <TT>iqdisc</TT>-->
<H4 CLASS="subsubsection"><!--SEC ANCHOR --><TT>iqdisc</TT></H4><!--SEC END --><P>
<A NAME="modiqdiscoption"></A>
</P><P>Many modules define handlers for processing IQ queries of different namespaces
to this server or to a user (e.&#XA0;g. to <TT>example.org</TT> or to
<TT>user@example.org</TT>). This option defines processing discipline for
these queries. Possible values are:
</P><DL CLASS="description"><DT CLASS="dt-description">
<B><TT>no_queue</TT></B></DT><DD CLASS="dd-description"> All queries of a namespace with this processing discipline are
processed immediately. This also means that no other packets can be processed
until this one has been completely processed. Hence this discipline is not
recommended if the processing of a query can take a relatively long time.
</DD><DT CLASS="dt-description"><B><TT>one_queue</TT></B></DT><DD CLASS="dd-description"> In this case a separate queue is created for the processing
of IQ queries of a namespace with this discipline. In addition, the processing
of this queue is done in parallel with that of other packets. This discipline
is most recommended.
</DD><DT CLASS="dt-description"><B><TT>parallel</TT></B></DT><DD CLASS="dd-description"> For every packet with this discipline a separate Erlang process
is spawned. Consequently, all these packets are processed in parallel.
Although spawning of Erlang process has a relatively low cost, this can break
the server's normal work, because the Erlang emulator has a limit on the
number of processes (32000 by default).
</DD></DL><P>Example:
</P><PRE CLASS="verbatim">  {modules,
   [
    ...
    {mod_time, [{iqdisc, no_queue}]},
    ...
   ]}.
</PRE><!--TOC subsubsection <TT>host</TT>-->
<H4 CLASS="subsubsection"><!--SEC ANCHOR --><TT>host</TT></H4><!--SEC END --><P>
<A NAME="modhostoption"></A>
</P><P>This option defines the Jabber ID of a service provided by an ejabberd module.
The keyword "@HOST@" is replaced at start time with the real virtual host string.</P><P>This example configures
the echo module to provide its echoing service 
in the Jabber ID <TT>mirror.example.org</TT>:
</P><PRE CLASS="verbatim">  {modules,
   [
    ...
    {mod_echo, [{host, "mirror.example.org"}]},
    ...
   ]}.
</PRE><P>However, if there are several virtual hosts and this module is enabled in all of them,
the "@HOST@" keyword must be used:
</P><PRE CLASS="verbatim">  {modules,
   [
    ...
    {mod_echo, [{host, "mirror.@HOST@"}]},
    ...
   ]}.
</PRE><!--TOC subsection <TT>mod_announce</TT>-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc32">3.3.3</A>&#XA0;&#XA0;<TT>mod_announce</TT></H3><!--SEC END --><P>
<A NAME="modannounce"></A>
</P><P>This module enables configured users to broadcast announcements and to set
the message of the day (MOTD). Configured users can do these actions with their
Jabber client using Ad-hoc commands or by sending messages to specific JIDs. These JIDs are listed in
next paragraph. The first JID in each entry will apply only to the virtual host
<TT>example.org</TT>, while the JID between brackets will apply to all virtual
hosts:
</P><DL CLASS="description"><DT CLASS="dt-description">
<B><TT>example.org/announce/all (example.org/announce/all-hosts/all)</TT></B></DT><DD CLASS="dd-description"> The
message is sent to all registered users. If the user is online and connected
to several resources, only the resource with the highest priority will receive
the message. If the registered user is not connected, the message will be
stored offline in assumption that offline storage
(see section&#XA0;<A HREF="#modoffline">3.3.10</A>) is enabled.
</DD><DT CLASS="dt-description"><B><TT>example.org/announce/online (example.org/announce/all-hosts/online)</TT></B></DT><DD CLASS="dd-description">The
message is sent to all connected users. If the user is online and connected
to several resources, all resources will receive the message.
</DD><DT CLASS="dt-description"><B><TT>example.org/announce/motd (example.org/announce/all-hosts/motd)</TT></B></DT><DD CLASS="dd-description">The
message is set as the message of the day (MOTD) and is sent to users when they
login. In addition the message is sent to all connected users (similar to
<TT>announce/online</TT>).
</DD><DT CLASS="dt-description"><B><TT>example.org/announce/motd/update (example.org/announce/all-hosts/motd/update)</TT></B></DT><DD CLASS="dd-description">
The message is set as message of the day (MOTD) and is sent to users when they
login. The message is <EM>not sent</EM> to any currently connected user.
</DD><DT CLASS="dt-description"><B><TT>example.org/announce/motd/delete (example.org/announce/all-hosts/motd/delete)</TT></B></DT><DD CLASS="dd-description">
Any message sent to this JID removes the existing message of the day (MOTD).
</DD></DL><P>Options:
</P><DL CLASS="description"><DT CLASS="dt-description">
<B><TT>access</TT></B></DT><DD CLASS="dd-description"> This option specifies who is allowed to
send announcements and to set the message of the day (by default, nobody is
able to send such messages).
</DD></DL><P>Examples:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
Only administrators can send announcements:
<PRE CLASS="verbatim">  {access, announce, [{allow, admins}]}.

  {modules,
   [
    ...
    {mod_announce, [{access, announce}]},
    ...
   ]}.
</PRE></LI><LI CLASS="li-itemize">Administrators as well as the direction can send announcements:
<PRE CLASS="verbatim">  {acl, direction, {user, "big_boss", "example.org"}}.
  {acl, direction, {user, "assistant", "example.org"}}.
  {acl, admins, {user, "admin", "example.org"}}.
  ...
  {access, announce, [{allow, admins},
                      {allow, direction}]}.
  ...
  {modules,
   [
    ...
    {mod_announce, [{access, announce}]},
    ...
   ]}.
</PRE></LI></UL><P>Note that <TT>mod_announce</TT> can be resource intensive on large
deployments as it can broadcast lot of messages. This module should be
disabled for instances of ejabberd with hundreds of thousands users.</P><!--TOC subsection <TT>mod_disco</TT>-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc33">3.3.4</A>&#XA0;&#XA0;<TT>mod_disco</TT></H3><!--SEC END --><P>
<A NAME="moddisco"></A>
</P><P>This module adds support for Service Discovery (<A HREF="http://www.xmpp.org/extensions/xep-0030.html">XEP-0030</A>). With
this module enabled, services on your server can be discovered by
Jabber clients. Note that <TT>ejabberd</TT> has no modules with support
for the superseded Jabber Browsing (<A HREF="http://www.xmpp.org/extensions/xep-0011.html">XEP-0011</A>) and Agent Information
(<A HREF="http://www.xmpp.org/extensions/xep-0094.html">XEP-0094</A>). Accordingly, Jabber clients need to have support for
the newer Service Discovery protocol if you want them be able to discover
the services you offer.</P><P>Options:
</P><DL CLASS="description"><DT CLASS="dt-description">
<B><TT>iqdisc</TT></B></DT><DD CLASS="dd-description"> This specifies 
the processing discipline for Service Discovery (<TT>http://jabber.org/protocol/disco#items</TT> and
<TT>http://jabber.org/protocol/disco#info</TT>) IQ queries (see section&#XA0;<A HREF="#modiqdiscoption">3.3.2</A>).
</DD><DT CLASS="dt-description"><B><TT>extra_domains</TT></B></DT><DD CLASS="dd-description"> With this option,
extra domains can be added to the Service Discovery item list.
</DD></DL><P>Examples:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
To serve a link to the Jabber User Directory on <TT>jabber.org</TT>:
<PRE CLASS="verbatim">  {modules,
   [
    ...
    {mod_disco, [{extra_domains, ["users.jabber.org"]}]},
    ...
   ]}.
</PRE></LI><LI CLASS="li-itemize">To serve a link to the transports on another server:
<PRE CLASS="verbatim">  {modules,
   [
    ...
    {mod_disco, [{extra_domains, ["icq.example.com",
                                  "msn.example.com"]}]},
    ...
   ]}.
</PRE></LI><LI CLASS="li-itemize">To serve a link to a few friendly servers:
<PRE CLASS="verbatim">  {modules,
   [
    ...
    {mod_disco, [{extra_domains, ["example.org",
                                  "example.com"]}]},
    ...
   ]}.
</PRE></LI></UL><!--TOC subsection <TT>mod_echo</TT>-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc34">3.3.5</A>&#XA0;&#XA0;<TT>mod_echo</TT></H3><!--SEC END --><P>
<A NAME="modecho"></A>
</P><P>This module simply echoes any Jabber
packet back to the sender. This mirror can be of interest for
<TT>ejabberd</TT> and Jabber client debugging.</P><P>Options:
</P><DL CLASS="description"><DT CLASS="dt-description">

<B><TT>host</TT></B></DT><DD CLASS="dd-description">  This option defines the Jabber ID of the
service. If the <TT>host</TT> option is not specified, the Jabber ID will be the
hostname of the virtual host with the prefix `<TT>echo.</TT>'. The keyword "@HOST@"
is replaced at start time with the real virtual host name.

</DD></DL><P>Example: Mirror, mirror, on the wall, who is the most beautiful
of them all?
</P><PRE CLASS="verbatim">  {modules,
   [
    ...
    {mod_echo, [{host, "mirror.example.org"}]},
    ...
   ]}.
</PRE><!--TOC subsection <TT>mod_irc</TT>-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc35">3.3.6</A>&#XA0;&#XA0;<TT>mod_irc</TT></H3><!--SEC END --><P>
<A NAME="modirc"></A>
</P><P>This module is an IRC transport that can be used to join channels on IRC
servers.</P><P>End user information:

</P><UL CLASS="itemize"><LI CLASS="li-itemize">
A Jabber client with `groupchat 1.0' support or Multi-User
Chat support (<A HREF="http://www.xmpp.org/extensions/xep-0045.html">XEP-0045</A>) is necessary to join IRC channels.
</LI><LI CLASS="li-itemize">An IRC channel can be joined in nearly the same way as joining a
Jabber Multi-User Chat room. The difference is that the room name will
be `channel%<TT>irc.example.org</TT>' in case <TT>irc.example.org</TT> is
the IRC server hosting `channel'. And of course the host should point
to the IRC transport instead of the Multi-User Chat service.
</LI><LI CLASS="li-itemize">You can register your nickame by sending `IDENTIFY password' to<BR>
 <TT>nickserver!irc.example.org@irc.jabberserver.org</TT>.
</LI><LI CLASS="li-itemize">Entering your password is possible by sending `LOGIN nick password'<BR>
 to <TT>nickserver!irc.example.org@irc.jabberserver.org</TT>.
</LI><LI CLASS="li-itemize">When using a popular Jabber server, it can occur that no
connection can be achieved with some IRC servers because they limit the
number of conections from one IP.
</LI></UL><P>Options:
</P><DL CLASS="description"><DT CLASS="dt-description">

<B><TT>host</TT></B></DT><DD CLASS="dd-description">  This option defines the Jabber ID of the
service. If the <TT>host</TT> option is not specified, the Jabber ID will be the
hostname of the virtual host with the prefix `<TT>irc.</TT>'. The keyword "@HOST@"
is replaced at start time with the real virtual host name.

</DD><DT CLASS="dt-description"><B><TT>access</TT></B></DT><DD CLASS="dd-description"> This option can be used to specify who
may use the IRC transport (default value: <TT>all</TT>).
</DD><DT CLASS="dt-description"><B><TT>default_encoding</TT></B></DT><DD CLASS="dd-description"> Set the default IRC encoding (default value: <TT>"koi8-r"</TT>).
</DD></DL><P>Examples:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
In the first example, the IRC transport is available on (all) your
virtual host(s) with the prefix `<TT>irc.</TT>'. Furthermore, anyone is
able to use the transport. The default encoding is set to "iso8859-15".
<PRE CLASS="verbatim">  {modules,
   [
    ...
    {mod_irc, [{access, all}, {default_encoding, "iso8859-15"}]},
    ...
   ]}.
</PRE></LI><LI CLASS="li-itemize">In next example the IRC transport is available with JIDs with prefix <TT>irc-t.net</TT>.
Moreover, the transport is only accessible by paying customers registered on
our domains and on other servers.
<PRE CLASS="verbatim">  {acl, paying_customers, {user, "customer1", "example.net"}}.
  {acl, paying_customers, {user, "customer2", "example.com"}}.
  {acl, paying_customers, {user, "customer3", "example.org"}}.
  ...
  {access, paying_customers, [{allow, paying_customers},
                              {deny, all}]}.
  ...
  {modules,
   [
    ...
    {mod_irc, [{access, paying_customers},
               {host, "irc.example.net"}]},
    ...
   ]}.
</PRE></LI></UL><!--TOC subsection <TT>mod_last</TT>-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc36">3.3.7</A>&#XA0;&#XA0;<TT>mod_last</TT></H3><!--SEC END --><P>
<A NAME="modlast"></A>
</P><P>This module adds support for Last Activity (<A HREF="http://www.xmpp.org/extensions/xep-0012.html">XEP-0012</A>). It can be used to
discover when a disconnected user last accessed the server, to know when a
connected user was last active on the server, or to query the uptime of the
<TT>ejabberd</TT> server.</P><P>Options:
</P><DL CLASS="description"><DT CLASS="dt-description">
<B><TT>iqdisc</TT></B></DT><DD CLASS="dd-description"> This specifies 
the processing discipline for Last activity (<TT>jabber:iq:last</TT>) IQ queries (see section&#XA0;<A HREF="#modiqdiscoption">3.3.2</A>).
</DD></DL><!--TOC subsection <TT>mod_muc</TT>-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc37">3.3.8</A>&#XA0;&#XA0;<TT>mod_muc</TT></H3><!--SEC END --><P>
<A NAME="modmuc"></A>
</P><P>With this module enabled, your server will support Multi-User Chat
(<A HREF="http://www.xmpp.org/extensions/xep-0045.html">XEP-0045</A>). End users will be able to join text conferences. Notice
that this module is not (yet) clusterable.</P><P>Some of the features of Multi-User Chat:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
Sending private messages to room participants.
</LI><LI CLASS="li-itemize">Inviting users.
</LI><LI CLASS="li-itemize">Setting a conference topic.
</LI><LI CLASS="li-itemize">Creating password protected rooms.
</LI><LI CLASS="li-itemize">Kicking and banning participants.
</LI></UL><P>Options:
</P><DL CLASS="description"><DT CLASS="dt-description">

<B><TT>host</TT></B></DT><DD CLASS="dd-description">  This option defines the Jabber ID of the
service. If the <TT>host</TT> option is not specified, the Jabber ID will be the
hostname of the virtual host with the prefix `<TT>conference.</TT>'. The keyword "@HOST@"
is replaced at start time with the real virtual host name.

</DD><DT CLASS="dt-description"><B><TT>access</TT></B></DT><DD CLASS="dd-description"> You can specify who is allowed to use
the Multi-User Chat service (by default, everyone is allowed to use it).
</DD><DT CLASS="dt-description"><B><TT>access_create</TT></B></DT><DD CLASS="dd-description"> To configure who is
allowed to create new rooms at the Multi-User Chat service, this option
can be used (by default, everybody is allowed to create rooms).
</DD><DT CLASS="dt-description"><B><TT>access_persistent</TT></B></DT><DD CLASS="dd-description"> To configure who is
allowed to modify the 'persistent' chatroom option
(by default, everybody is allowed to modify that option).
</DD><DT CLASS="dt-description"><B><TT>access_admin</TT></B></DT><DD CLASS="dd-description"> This option specifies
who is allowed to administrate the Multi-User Chat service (the default
value is <TT>none</TT>, which means that only the room creator can
administer his room). By sending a message to the service JID,
administrators can send service messages that will be displayed in every
active room.
</DD><DT CLASS="dt-description"><B><TT>history_size</TT></B></DT><DD CLASS="dd-description"> A small history of the
current discussion is sent to users when they enter the room. With this option
you can define the number of history messages to keep and send to users
joining the room. The value is an integer. Setting the value to <TT>0</TT>
disables the history feature and, as a result, nothing is kept in memory. The
default value is <TT>20</TT>. This value is global and thus affects all rooms on
the server.</DD><DT CLASS="dt-description"><B><TT>max_users</TT></B></DT><DD CLASS="dd-description">  This option defines at
the server level, the maximum number of users allowed per MUC
room. It can be lowered in each room configuration but cannot be
increased in individual MUC room configuration. The default value is
200.</DD><DT CLASS="dt-description"><B><TT>max_users_admin_threshold</TT></B></DT><DD CLASS="dd-description">
 This option defines the
number of MUC admins or owners to allow to enter the room even if
the maximum number of allowed users is reached. The default limits
is 5. In most cases this default value is the best setting.</DD><DT CLASS="dt-description"><B><TT>min_message_interval</TT></B></DT><DD CLASS="dd-description"> 
This option defines the minimum interval between two messages send by
a user in seconds. This option is global and valid for all chat
rooms. A decimal value can be used. When this option is not defined,
message rate is not limited. This feature can be used to protect a MUC
service from users abuses and limit number of messages that will be
broadcasted by the service. A good value for this minimum message
interval is 0.4 second. If a user tries to send messages faster, an
error is send back explaining that the message have been discarded and
describing the reason why the message is not acceptable.
</DD><DT CLASS="dt-description"><B><TT>min_presence_interval</TT></B></DT><DD CLASS="dd-description"> 
This option defines the minimum of time between presence changes
coming from a given user in seconds. This option is global and valid
for all chat rooms. A decimal value can be used. When this option is
not defined, no restriction is applied. This option can be used to
protect a MUC service for users abuses, as fastly changing a user
presence will result in possible large presence packet broadcast. If a
user tries to change its presence more often than the specified
interval, the presence is cached by ejabberd and only the last
presence is broadcasted to all users in the room after expiration of
the interval delay. Intermediate presence packets are silently
discarded. A good value for this option is 4 seconds.
</DD><DT CLASS="dt-description"><B><TT>default_room_opts</TT></B></DT><DD CLASS="dd-description"> This option allow
to define the desired default room options.
Obviously, the room creator can modify the room options at any time.
The available room options are:
<TT>allow_change_subj</TT>, <TT>allow_private_messages</TT>,
<TT>allow_query_users</TT>, <TT>allow_user_invites</TT>,
<TT>anonymous</TT>, <TT>logging</TT>, <TT>members_by_default</TT>,
<TT>members_only</TT>, <TT>moderated</TT>, <TT>password</TT>,
<TT>password_protected</TT>, <TT>persistent</TT>,
<TT>public</TT>, <TT>public_list</TT>, <TT>title</TT>.
All of them can be set to <TT>true</TT> or <TT>false</TT>,
except <TT>password</TT> and <TT>title</TT> which are strings.
</DD></DL><P>Examples:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
In the first example everyone is allowed to use the Multi-User Chat
service. Everyone will also be able to create new rooms but only the user
<TT>admin@example.org</TT> is allowed to administrate any room. In this
example he is also a global administrator. When <TT>admin@example.org</TT>
sends a message such as `Tomorrow, the Jabber server will be moved
to new hardware. This will involve service breakdowns around 23:00 UMT.
We apologise for this inconvenience.' to <TT>conference.example.org</TT>,
it will be displayed in all active rooms. In this example the history
feature is disabled.
<PRE CLASS="verbatim">  {acl, admins, {user, "admin", "example.org"}}.
  ...
  {access, muc_admins, [{allow, admins}]}.
  ...
  {modules,
   [
    ...
    {mod_muc, [{access, all},
               {access_create, all},
               {access_admin, muc_admins},
               {history_size, 0}]},
    ...
   ]}.
</PRE></LI><LI CLASS="li-itemize">In the second example the Multi-User Chat service is only accessible by
paying customers registered on our domains and on other servers. Of course
the administrator is also allowed to access rooms. In addition, he is the
only authority able to create and administer rooms. When
<TT>admin@example.org</TT> sends a message such as `Tomorrow, the Jabber
server will be moved to new hardware. This will involve service breakdowns
around 23:00 UMT. We apologise for this inconvenience.' to
<TT>conference.example.org</TT>, it will be displayed in all active rooms. No
<TT>history_size</TT> option is used, this means that the feature is enabled
and the default value of 20 history messages will be send to the users.
<PRE CLASS="verbatim">  {acl, paying_customers, {user, "customer1", "example.net"}}.
  {acl, paying_customers, {user, "customer2", "example.com"}}.
  {acl, paying_customers, {user, "customer3", "example.org"}}.
  {acl, admins, {user, "admin", "example.org"}}.
  ...
  {access, muc_admins, [{allow, admins},
                        {deny, all}]}.
  {access, muc_access, [{allow, paying_customers},
                        {allow, admins},
                        {deny, all}]}.
  ...
  {modules,
   [
    ...
    {mod_muc, [{access, muc_access},
               {access_create, muc_admins},
               {access_admin, muc_admins}]},
    ...
   ]}.
</PRE></LI><LI CLASS="li-itemize">In the following example, MUC anti abuse options are used. A
user cannot send more than one message every 0.4 seconds and cannot
change its presence more than once every 4 seconds. No ACLs are
defined, but some user restriction could be added as well:<PRE CLASS="verbatim">  ...
  {modules,
   [
    ...
    {mod_muc, [{min_message_interval, 0.4},
               {min_presence_interval, 4}]},
    ...
   ]}.
</PRE></LI><LI CLASS="li-itemize">This example shows how to use <TT>default_room_opts</TT> to make sure
newly created chatrooms have by default those options.
<PRE CLASS="verbatim">  {modules,
   [
    ...
    {mod_muc, [{access, muc_access},
               {access_create, muc_admins},
               {default_room_options, [
                 {allow_change_subj, false},
                 {allow_query_users, true},
                 {allow_private_messages, true},
                 {members_by_default, false},
                 {title, "New chatroom"},
                 {anonymous, false}
               ]},
               {access_admin, muc_admins}]},
    ...
   ]}.
</PRE></LI></UL><P>The Multi-Users Chat module now supports clustering and load
balancing. One module can be started per cluster node. Rooms are
distributed at creation time on all available MUC module
instances. The multi-user chat module is clustered but the room
themselves are not clustered nor fault-tolerant: If the node managing a
set of rooms goes down, the rooms disappear and they will be recreated
on an available node on first connection attempt.</P><!--TOC subsection <TT>mod_muc_log</TT>-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc38">3.3.9</A>&#XA0;&#XA0;<TT>mod_muc_log</TT></H3><!--SEC END --><P>
<A NAME="modmuclog"></A>
</P><P>This module enables optional logging of Multi-User Chat (MUC) conversations to
HTML. Once you enable this module, users can join a chatroom using a MUC capable
Jabber client, and if they have enough privileges, they can request the
configuration form in which they can set the option to enable chatroom logging.</P><P>Features:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
Chatroom details are added on top of each page: room title, JID,
author, subject and configuration.
</LI><LI CLASS="li-itemize">
Room title and JID are links to join the chatroom (using
<A HREF="http://www.ietf.org/rfc/rfc4622.txt">XMPP URIs</A>).
</LI><LI CLASS="li-itemize">Subject and chatroom configuration changes are tracked and displayed.
</LI><LI CLASS="li-itemize">Joins, leaves, nick changes, kicks, bans and `/me' are tracked and
displayed, including the reason if available.
</LI><LI CLASS="li-itemize">Generated HTML files are XHTML 1.0 Transitional and CSS compliant.
</LI><LI CLASS="li-itemize">Timestamps are self-referencing links.
</LI><LI CLASS="li-itemize">Links on top for quicker navigation: Previous day, Next day, Up.
</LI><LI CLASS="li-itemize">CSS is used for style definition, and a custom CSS file can be used.
</LI><LI CLASS="li-itemize">URLs on messages and subjects are converted to hyperlinks.
</LI><LI CLASS="li-itemize">Timezone used on timestamps is shown on the log files.
</LI><LI CLASS="li-itemize">A custom link can be added on top of each page.
</LI></UL><P>Options:
</P><DL CLASS="description"><DT CLASS="dt-description">
<B><TT>access_log</TT></B></DT><DD CLASS="dd-description">
This option restricts which users are allowed to enable or disable chatroom
logging. The default value is <TT>muc_admin</TT>. Note for this default setting
you need to have an access rule for <TT>muc_admin</TT> in order to take effect.
</DD><DT CLASS="dt-description"><B><TT>cssfile</TT></B></DT><DD CLASS="dd-description">
With this option you can set whether the HTML files should have a custom CSS
file or if they need to use the embedded CSS file. Allowed values are
<TT>false</TT> and an URL to a CSS file. With the first value, HTML files will
include the embedded CSS code. With the latter, you can specify the URL of the
custom CSS file (for example: `http://example.com/my.css'). The default value
is <TT>false</TT>.
</DD><DT CLASS="dt-description"><B><TT>dirtype</TT></B></DT><DD CLASS="dd-description">
The type of the created directories can be specified with this option. Allowed
values are <TT>subdirs</TT> and <TT>plain</TT>. With the first value,
subdirectories are created for each year and month. With the latter, the
names of the log files contain the full date, and there are no subdirectories.
The default value is <TT>subdirs</TT>.
</DD><DT CLASS="dt-description"><B><TT>outdir</TT></B></DT><DD CLASS="dd-description">
This option sets the full path to the directory in which the HTML files should
be stored. Make sure the <TT>ejabberd</TT> daemon user has write access on that
directory. The default value is <TT>"www/muc"</TT>.
</DD><DT CLASS="dt-description"><B><TT>timezone</TT></B></DT><DD CLASS="dd-description">
The time zone for the logs is configurable with this option. Allowed values
are <TT>local</TT> and <TT>universal</TT>. With the first value, the local time,
as reported to Erlang by the operating system, will be used. With the latter,
GMT/UTC time will be used. The default value is <TT>local</TT>.
</DD><DT CLASS="dt-description"><B><TT>spam_prevention</TT></B></DT><DD CLASS="dd-description">
To prevent spam, the <TT>spam_prevention</TT> option adds a special attribute
to links that prevent their indexation by search engines. The default value
is <TT>true</TT>, which mean that nofollow attributes will be added to user
submitted links. 
</DD><DT CLASS="dt-description"><B><TT>top_link</TT></B></DT><DD CLASS="dd-description">
With this option you can customize the link on the top right corner of each
log file. The syntax of this option is <TT>{"URL", "Text"}</TT>. The default
value is <TT>{"/", "Home"}</TT>.
</DD></DL><P>Examples:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
In the first example any chatroom owner can enable logging, and a
custom CSS file will be used (http://example.com/my.css). Further, the names
of the log files will contain the full date, and there will be no
subdirectories. The log files will be stored in /var/www/muclogs, and the
time zone will be GMT/UTC. Finally, the top link will be
<CODE>&lt;a href="http://www.jabber.ru"&gt;Jabber.ru&lt;/a&gt;</CODE>.
<PRE CLASS="verbatim">  {access, muc, [{allow, all}]}.
  ...
  {modules,
   [
    ...
    {mod_muc_log, [
               {access_log, muc},
               {cssfile, "http://example.com/my.css"},
               {dirtype, plain},
               {outdir, "/var/www/muclogs"},
               {timezone, universal},
               {spam_prevention, true},
               {top_link, {"http://www.jabber.ru", "Jabber.ru"}}
    ]},
    ...
   ]}.
</PRE></LI><LI CLASS="li-itemize">In the second example only <TT>admin1@example.org</TT> and
<TT>admin2@example.net</TT> can enable logging, and the embedded CSS file will be
used. Further, the names of the log files will only contain the day (number),
and there will be subdirectories for each year and month. The log files will
be stored in /var/www/muclogs, and the local time will be used. Finally, the
top link will be the default <CODE>&lt;a href="/"&gt;Home&lt;/a&gt;</CODE>.
<PRE CLASS="verbatim">  {acl, admins, {user, "admin1", "example.org"}}.
  {acl, admins, {user, "admin2", "example.net"}}.
  ...
  {access, muc_log, [{allow, admins},
                     {deny, all}]}.
  ...
  {modules,
   [
    ...
    {mod_muc_log, [
               {access_log, muc_log},
               {cssfile, false},
               {dirtype, subdirs},
               {outdir, "/var/www/muclogs"},
               {timezone, local}
    ]},
    ...
   ]}.
</PRE></LI></UL><!--TOC subsection <TT>mod_offline</TT>-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc39">3.3.10</A>&#XA0;&#XA0;<TT>mod_offline</TT></H3><!--SEC END --><P>
<A NAME="modoffline"></A>
</P><P>This module implements offline message storage. This means that all messages
sent to an offline user will be stored on the server until that user comes
online again. Thus it is very similar to how email works. Note that
<TT>ejabberdctl</TT> has a command to delete expired messages
(see section&#XA0;<A HREF="#ejabberdctl">4.1.2</A>).</P><DL CLASS="description"><DT CLASS="dt-description">
<B><TT>user_max_messages</TT></B></DT><DD CLASS="dd-description">This option
is use to set a max number of offline messages per user (quota). Its
value can be either <TT>infinity</TT> or a strictly positive
integer. The default value is <TT>infinity</TT>.
</DD></DL><!--TOC subsection <TT>mod_privacy</TT>-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc40">3.3.11</A>&#XA0;&#XA0;<TT>mod_privacy</TT></H3><!--SEC END --><P>
<A NAME="modprivacy"></A>
</P><P>This module implements Blocking Communication (also known as Privacy Rules)
as defined in section 10 from XMPP IM. If end users have support for it in
their Jabber client, they will be able to:
</P><BLOCKQUOTE CLASS="quote">
<UL CLASS="itemize"><LI CLASS="li-itemize">
Retrieving one's privacy lists.
</LI><LI CLASS="li-itemize">Adding, removing, and editing one's privacy lists.
</LI><LI CLASS="li-itemize">Setting, changing, or declining active lists.
</LI><LI CLASS="li-itemize">Setting, changing, or declining the default list (i.e., the list that
is active by default).
</LI><LI CLASS="li-itemize">Allowing or blocking messages based on JID, group, or subscription type
(or globally).
</LI><LI CLASS="li-itemize">Allowing or blocking inbound presence notifications based on JID, group,
or subscription type (or globally).
</LI><LI CLASS="li-itemize">Allowing or blocking outbound presence notifications based on JID, group,
or subscription type (or globally).
</LI><LI CLASS="li-itemize">Allowing or blocking IQ stanzas based on JID, group, or subscription type
(or globally).
</LI><LI CLASS="li-itemize">Allowing or blocking all communications based on JID, group, or
subscription type (or globally).
</LI></UL>
(from <A HREF="http://www.xmpp.org/specs/rfc3921.html#privacy"><TT>http://www.xmpp.org/specs/rfc3921.html#privacy</TT></A>)
</BLOCKQUOTE><P>Options:
</P><DL CLASS="description"><DT CLASS="dt-description">
<B><TT>iqdisc</TT></B></DT><DD CLASS="dd-description"> This specifies 
the processing discipline for Blocking Communication (<TT>jabber:iq:privacy</TT>) IQ queries (see section&#XA0;<A HREF="#modiqdiscoption">3.3.2</A>).
</DD></DL><!--TOC subsection <TT>mod_private</TT>-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc41">3.3.12</A>&#XA0;&#XA0;<TT>mod_private</TT></H3><!--SEC END --><P>
<A NAME="modprivate"></A>
</P><P>This module adds support for Private XML Storage (<A HREF="http://www.xmpp.org/extensions/xep-0049.html">XEP-0049</A>):
</P><BLOCKQUOTE CLASS="quote">
Using this method, Jabber entities can store private data on the server and
retrieve it whenever necessary. The data stored might be anything, as long as
it is valid XML. One typical usage for this namespace is the server-side storage
of client-specific preferences; another is Bookmark Storage (<A HREF="http://www.xmpp.org/extensions/xep-0048.html">XEP-0048</A>).
</BLOCKQUOTE><P>Options:
</P><DL CLASS="description"><DT CLASS="dt-description">
<B><TT>iqdisc</TT></B></DT><DD CLASS="dd-description"> This specifies 
the processing discipline for Private XML Storage (<TT>jabber:iq:private</TT>) IQ queries (see section&#XA0;<A HREF="#modiqdiscoption">3.3.2</A>).
</DD></DL><!--TOC subsection <TT>mod_proxy65</TT>-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc42">3.3.13</A>&#XA0;&#XA0;<TT>mod_proxy65</TT></H3><!--SEC END --><P>
<A NAME="modproxy"></A>
</P><P>This module implements SOCKS5 Bytestreams (<A HREF="http://www.xmpp.org/extensions/xep-0065.html">XEP-0065</A>).
It allows <TT>ejabberd</TT> to act as a file transfer proxy between two
XMPP clients.</P><P>Options:
</P><DL CLASS="description"><DT CLASS="dt-description">
<B><TT>host</TT></B></DT><DD CLASS="dd-description">This option defines the hostname of the service.
If this option is not set, the prefix `<TT>proxy.</TT>' is added to <TT>ejabberd</TT>
hostname.
</DD><DT CLASS="dt-description"><B><TT>name</TT></B></DT><DD CLASS="dd-description">Defines Service Discovery name of the service.
Default is <TT>"SOCKS5 Bytestreams"</TT>.
</DD><DT CLASS="dt-description"><B><TT>ip</TT></B></DT><DD CLASS="dd-description">This option specifies which network interface
to listen for. Default is an IP address of the service's DNS name, or,
if fails, <CODE>{127,0,0,1}</CODE>.
</DD><DT CLASS="dt-description"><B><TT>port</TT></B></DT><DD CLASS="dd-description">This option defines port to listen for
incoming connections. Default is&#XA0;7777.
</DD><DT CLASS="dt-description"><B><TT>auth_type</TT></B></DT><DD CLASS="dd-description">SOCKS5 authentication type.
Possible values are <TT>anonymous</TT> and <TT>plain</TT>. Default is
<TT>anonymous</TT>.
</DD><DT CLASS="dt-description"><B><TT>access</TT></B></DT><DD CLASS="dd-description">Defines ACL for file transfer initiators.
Default is <TT>all</TT>.
</DD><DT CLASS="dt-description"><B><TT>max_connections</TT></B></DT><DD CLASS="dd-description">Maximum number of
active connections per file transfer initiator. No limit by default.
</DD><DT CLASS="dt-description"><B><TT>shaper</TT></B></DT><DD CLASS="dd-description">This option defines shaper for
the file transfer peers. Shaper with the maximum bandwidth will be selected.
Default is <TT>none</TT>.
</DD></DL><P>Examples:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
The simpliest configuration of the module:
<PRE CLASS="verbatim">  {modules,
   [
    ...
    {mod_proxy65, []},
    ...
  ]}.
</PRE></LI><LI CLASS="li-itemize">More complicated configuration.
<PRE CLASS="verbatim">  {acl, proxy_users, {server, "example.org"}}.
  {access, proxy65_access, [{allow, proxy_users}, {deny, all}]}.
  ...
  {acl, admin, {user, "admin", "example.org"}}.
  {shaper, normal, {maxrate, 10240}}. %% 10 Kbytes/sec
  {access, proxy65_shaper, [{none, admin}, {normal, all}]}.
  ...
  {modules,
   [
    ...
    {mod_proxy65, [{host, "proxy1.example.org"},
                   {name, "File Transfer Proxy"},
                   {ip, {200,150,100,1}},
                   {port, 7778},
                   {max_connections, 5},
                   {access, proxy65_access},
                   {shaper, proxy65_shaper}]},
    ...
  ]}.
</PRE></LI></UL><!--TOC subsection <TT>mod_pubsub</TT>-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc43">3.3.14</A>&#XA0;&#XA0;<TT>mod_pubsub</TT></H3><!--SEC END --><P>
<A NAME="modpubsub"></A>
</P><P>This module offers a Publish-Subscribe Service (<A HREF="http://www.xmpp.org/extensions/xep-0060.html">XEP-0060</A>).
Publish-Subscribe can be used to develop (examples are taken from the XEP):
</P><BLOCKQUOTE CLASS="quote">
<UL CLASS="itemize"><LI CLASS="li-itemize">
news feeds and content syndacation,
</LI><LI CLASS="li-itemize">avatar management,
</LI><LI CLASS="li-itemize">shared bookmarks,
</LI><LI CLASS="li-itemize">auction and trading systems,
</LI><LI CLASS="li-itemize">online catalogs,
</LI><LI CLASS="li-itemize">workflow systems,
</LI><LI CLASS="li-itemize">network management systems,
</LI><LI CLASS="li-itemize">NNTP gateways,
</LI><LI CLASS="li-itemize">vCard/profile management,
</LI><LI CLASS="li-itemize">and weblogs.
</LI></UL>
</BLOCKQUOTE><P>
Another example is <A HREF="http://www.process-one.net/en/projects/j-eai/">J-EAI</A>.
This is an XMPP-based Enterprise Application Integration (EAI) platform (also
known as ESB, the Enterprise Service Bus). The J-EAI project builts upon
<TT>ejabberd</TT>'s codebase and has contributed several features to <TT>mod_pubsub</TT>.</P><P>Options:
</P><DL CLASS="description"><DT CLASS="dt-description">

<B><TT>host</TT></B></DT><DD CLASS="dd-description">  This option defines the Jabber ID of the
service. If the <TT>host</TT> option is not specified, the Jabber ID will be the
hostname of the virtual host with the prefix `<TT>pubsub.</TT>'. The keyword "@HOST@"
is replaced at start time with the real virtual host name.

</DD><DT CLASS="dt-description"><B><TT>served_hosts</TT></B></DT><DD CLASS="dd-description"> To specify which hosts needs to
be served, you can use this option. If absent, only the main <TT>ejabberd</TT>
host is served. </DD><DT CLASS="dt-description"><B><TT>access_createnode</TT></B></DT><DD CLASS="dd-description"> 
This option restricts which users are allowed to create pubsub nodes using
ACL and ACCESS. The default value is <TT>pubsub_createnode</TT>. </DD></DL><P>Example:
</P><PRE CLASS="verbatim">  {modules,
   [
    ...
    {mod_pubsub, [{served_hosts, ["example.com",
                                  "example.org"]},
                  {access_createnode, pubsub_createnode}]}
    ...
   ]}.
</PRE><!--TOC subsection <TT>mod_register</TT>-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc44">3.3.15</A>&#XA0;&#XA0;<TT>mod_register</TT></H3><!--SEC END --><P>
<A NAME="modregister"></A>
</P><P>This module adds support for In-Band Registration (<A HREF="http://www.xmpp.org/extensions/xep-0077.html">XEP-0077</A>). This protocol
enables end users to use a Jabber client to:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
Register a new account on the server.
</LI><LI CLASS="li-itemize">Change the password from an existing account on the server.
</LI><LI CLASS="li-itemize">Delete an existing account on the server.
</LI></UL><P>Options:
</P><DL CLASS="description"><DT CLASS="dt-description">
<B><TT>access</TT></B></DT><DD CLASS="dd-description"> This option can be configured to specify
rules to restrict registration. If a rule returns `deny' on the requested
user name, registration for that user name is dennied. (there are no
restrictions by default).
</DD><DT CLASS="dt-description"><B><TT>iqdisc</TT></B></DT><DD CLASS="dd-description"> This specifies 
the processing discipline for In-Band Registration (<TT>jabber:iq:register</TT>) IQ queries (see section&#XA0;<A HREF="#modiqdiscoption">3.3.2</A>).
</DD></DL><P>Examples:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
Next example prohibits the registration of too short account names:
<PRE CLASS="verbatim">  {acl, shortname, {user_glob, "?"}}.
  {acl, shortname, {user_glob, "??"}}.
  % The same using regexp:
  %{acl, shortname, {user_regexp, "^..?$"}}.
  ...
  {access, register, [{deny, shortname},
                      {allow, all}]}.
  ...
  {modules,
   [
    ...
    {mod_register, [{access, register}]},
    ...
   ]}.
</PRE></LI><LI CLASS="li-itemize">The in-band registration of new accounts can be prohibited by changing the
<TT>access</TT> option. If you really want to disable all In-Band Registration
functionality, that is changing passwords in-band and deleting accounts
in-band, you have to remove <TT>mod_register</TT> from the modules list. In this
example all In-Band Registration functionality is disabled:
<PRE CLASS="verbatim">  {access, register, [{deny, all}]}.

  {modules,
   [
    ...
%    {mod_register, [{access, register}]},
    ...
   ]}.
</PRE></LI></UL><!--TOC subsection <TT>mod_roster</TT>-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc45">3.3.16</A>&#XA0;&#XA0;<TT>mod_roster</TT></H3><!--SEC END --><P>
<A NAME="modroster"></A>
</P><P>This module implements roster management as defined in <A HREF="http://www.xmpp.org/specs/rfc3921.html#roster">RFC 3921: XMPP IM</A>.</P><P>Options:
</P><DL CLASS="description"><DT CLASS="dt-description">
<B><TT>iqdisc</TT></B></DT><DD CLASS="dd-description"> This specifies 
the processing discipline for Roster Management (<TT>jabber:iq:roster</TT>) IQ queries (see section&#XA0;<A HREF="#modiqdiscoption">3.3.2</A>).
</DD></DL><!--TOC subsection <TT>mod_service_log</TT>-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc46">3.3.17</A>&#XA0;&#XA0;<TT>mod_service_log</TT></H3><!--SEC END --><P>
<A NAME="modservicelog"></A>
</P><P>This module adds support for logging end user packets via a Jabber message
auditing service such as
<A HREF="http://www.funkypenguin.co.za/bandersnatch/">Bandersnatch</A>. All user
packets are encapsulated in a <CODE>&lt;route/&gt;</CODE> element and sent to the specified
service(s).</P><P>Options:
</P><DL CLASS="description"><DT CLASS="dt-description">
<B><TT>loggers</TT></B></DT><DD CLASS="dd-description"> With this option a (list of) service(s)
that will receive the packets can be specified.
</DD></DL><P>Examples:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
To log all end user packets to the Bandersnatch service running on
<TT>bandersnatch.example.com</TT>:
<PRE CLASS="verbatim">  {modules,
   [
    ...
    {mod_service_log, [{loggers, ["bandersnatch.example.com"]}]},
    ...
   ]}.
</PRE></LI><LI CLASS="li-itemize">To log all end user packets to the Bandersnatch service running on
<TT>bandersnatch.example.com</TT> and the backup service on 
<TT>bandersnatch.example.org</TT>:
<PRE CLASS="verbatim">  {modules,
   [
    ...
    {mod_service_log, [{loggers, ["bandersnatch.example.com",
                                  "bandersnatch.example.org"]}]},
    ...
   ]}.
</PRE></LI></UL><!--TOC subsection <TT>mod_shared_roster</TT>-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc47">3.3.18</A>&#XA0;&#XA0;<TT>mod_shared_roster</TT></H3><!--SEC END --><P>
<A NAME="modsharedroster"></A>
</P><P>This module enables you to create shared roster groups. This means that you can
create groups of people that can see members from (other) groups in their
rosters. The big advantages of this feature are that end users do not need to
manually add all users to their rosters, and that they cannot permanently delete
users from the shared roster groups.</P><P>Shared roster groups can be edited <EM>only</EM> via the web interface. Each group
has a unique identification and the following parameters:
</P><DL CLASS="description"><DT CLASS="dt-description">
<B>Name</B></DT><DD CLASS="dd-description"> The name of the group, which will be displayed in the roster.
</DD><DT CLASS="dt-description"><B>Description</B></DT><DD CLASS="dd-description"> The description of the group. This parameter does not affect
anything.
</DD><DT CLASS="dt-description"><B>Members</B></DT><DD CLASS="dd-description"> A list of full JIDs of group members, entered one per line in
the web interface.
</DD><DT CLASS="dt-description"><B>Displayed groups</B></DT><DD CLASS="dd-description"> A list of groups that will be in the rosters of this
group's members.
</DD></DL><P>Examples:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
Take the case of a computer club that wants all its members seeing each
other in their rosters. To achieve this, they need to create a shared roster
group similar to next table:
<BLOCKQUOTE CLASS="table"><DIV CLASS="center"><DIV CLASS="center"><HR WIDTH="80%" SIZE=2></DIV>
<TABLE BORDER=1 CELLSPACING=0 CELLPADDING=1><TR><TD ALIGN=left NOWRAP>Identification</TD><TD ALIGN=left NOWRAP>Group `<TT>club_members</TT>'</TD></TR>
<TR><TD ALIGN=left NOWRAP>Name</TD><TD ALIGN=left NOWRAP>Club Members</TD></TR>
<TR><TD ALIGN=left NOWRAP>Description</TD><TD ALIGN=left NOWRAP>Members from the computer club</TD></TR>
<TR><TD ALIGN=left NOWRAP>Members</TD><TD ALIGN=left NOWRAP> <TABLE CELLSPACING=6 CELLPADDING=0><TR><TD ALIGN=left NOWRAP> <TT>member1@example.org</TT></TD></TR>
<TR><TD ALIGN=left NOWRAP> <TT>member2@example.org</TT></TD></TR>
<TR><TD ALIGN=left NOWRAP> <TT>member3@example.org</TT></TD></TR>
</TABLE></TD></TR>
<TR><TD ALIGN=left NOWRAP>Displayed groups</TD><TD ALIGN=left NOWRAP><TT>club_members</TT></TD></TR>
</TABLE>
<DIV CLASS="center"><HR WIDTH="80%" SIZE=2></DIV></DIV></BLOCKQUOTE>
</LI><LI CLASS="li-itemize">In another case we have a company which has three divisions: Management,
Marketing and Sales. All group members should see all other members in their
rosters. Additonally, all managers should have all marketing and sales people
in their roster. Simultaneously, all marketeers and the whole sales team
should see all managers. This scenario can be achieved by creating shared
roster groups as shown in the following table:
<BLOCKQUOTE CLASS="table"><DIV CLASS="center"><DIV CLASS="center"><HR WIDTH="80%" SIZE=2></DIV>
<TABLE BORDER=1 CELLSPACING=0 CELLPADDING=1><TR><TD ALIGN=left NOWRAP>Identification</TD><TD ALIGN=left NOWRAP> Group `<TT>management</TT>'</TD><TD ALIGN=left NOWRAP> Group `<TT>marketing</TT>'</TD><TD ALIGN=left NOWRAP> Group `<TT>sales</TT>'</TD></TR>
<TR><TD ALIGN=left NOWRAP>Name</TD><TD ALIGN=left NOWRAP>Management</TD><TD ALIGN=left NOWRAP>Marketing</TD><TD ALIGN=left NOWRAP>Sales</TD></TR>
<TR><TD ALIGN=left NOWRAP>Description</TD><TD ALIGN=left NOWRAP>&nbsp;</TD></TR>
<TR><TD ALIGN=left NOWRAP> Members</TD><TD ALIGN=left NOWRAP> <TABLE CELLSPACING=6 CELLPADDING=0><TR><TD ALIGN=left NOWRAP> <TT>manager1@example.org</TT></TD></TR>
<TR><TD ALIGN=left NOWRAP> <TT>manager2@example.org</TT></TD></TR>
<TR><TD ALIGN=left NOWRAP> <TT>manager3@example.org</TT></TD></TR>
<TR><TD ALIGN=left NOWRAP> <TT>manager4@example.org</TT></TD></TR>
</TABLE>
</TD><TD ALIGN=left NOWRAP> <TABLE CELLSPACING=6 CELLPADDING=0><TR><TD ALIGN=left NOWRAP> <TT>marketeer1@example.org</TT></TD></TR>
<TR><TD ALIGN=left NOWRAP> <TT>marketeer2@example.org</TT></TD></TR>
<TR><TD ALIGN=left NOWRAP> <TT>marketeer3@example.org</TT></TD></TR>
<TR><TD ALIGN=left NOWRAP> <TT>marketeer4@example.org</TT></TD></TR>
</TABLE>
</TD><TD ALIGN=left NOWRAP> <TABLE CELLSPACING=6 CELLPADDING=0><TR><TD ALIGN=left NOWRAP> <TT>saleswoman1@example.org</TT></TD></TR>
<TR><TD ALIGN=left NOWRAP> <TT>salesman1@example.org</TT></TD></TR>
<TR><TD ALIGN=left NOWRAP> <TT>saleswoman2@example.org</TT></TD></TR>
<TR><TD ALIGN=left NOWRAP> <TT>salesman2@example.org</TT></TD></TR>
</TABLE></TD></TR>
<TR><TD ALIGN=left NOWRAP>Displayed groups</TD><TD ALIGN=left NOWRAP> <TABLE CELLSPACING=6 CELLPADDING=0><TR><TD ALIGN=left NOWRAP> <TT>management</TT></TD></TR>
<TR><TD ALIGN=left NOWRAP> <TT>marketing</TT></TD></TR>
<TR><TD ALIGN=left NOWRAP> <TT>sales</TT></TD></TR>
</TABLE>
</TD><TD ALIGN=left NOWRAP> <TABLE CELLSPACING=6 CELLPADDING=0><TR><TD ALIGN=left NOWRAP> <TT>management</TT></TD></TR>
<TR><TD ALIGN=left NOWRAP> <TT>marketing</TT></TD></TR>
</TABLE>
</TD><TD ALIGN=left NOWRAP> <TABLE CELLSPACING=6 CELLPADDING=0><TR><TD ALIGN=left NOWRAP> <TT>management</TT></TD></TR>
<TR><TD ALIGN=left NOWRAP> <TT>sales</TT></TD></TR>
</TABLE></TD></TR>
</TABLE>
<DIV CLASS="center"><HR WIDTH="80%" SIZE=2></DIV></DIV></BLOCKQUOTE>
</LI></UL><!--TOC subsection <TT>mod_stats</TT>-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc48">3.3.19</A>&#XA0;&#XA0;<TT>mod_stats</TT></H3><!--SEC END --><P>
<A NAME="modstats"></A>
</P><P>This module adds support for Statistics Gathering (<A HREF="http://www.xmpp.org/extensions/xep-0039.html">XEP-0039</A>). This protocol
allows you to retrieve next statistics from your <TT>ejabberd</TT> deployment:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
Total number of registered users on the current virtual host (users/total).
</LI><LI CLASS="li-itemize">Total number of registered users on all virtual hosts (users/all-hosts/total).
</LI><LI CLASS="li-itemize">Total number of online users on the current virtual host (users/online).
</LI><LI CLASS="li-itemize">Total number of online users on all virtual hosts (users/all-hosts/online).
</LI></UL><P>Options:
</P><DL CLASS="description"><DT CLASS="dt-description">
<B><TT>iqdisc</TT></B></DT><DD CLASS="dd-description"> This specifies 
the processing discipline for Statistics Gathering (<TT>http://jabber.org/protocol/stats</TT>) IQ queries (see section&#XA0;<A HREF="#modiqdiscoption">3.3.2</A>).
</DD></DL><P>As there are only a small amount of clients (for example
<A HREF="http://tkabber.jabber.ru/">Tkabber</A>) and software libraries with
support for this XEP, a few examples are given of the XML you need to send
in order to get the statistics. Here they are:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
You can request the number of online users on the current virtual host
(<TT>example.org</TT>) by sending:
<PRE CLASS="verbatim">&lt;iq to='example.org' type='get'&gt;
  &lt;query xmlns='http://jabber.org/protocol/stats'&gt;
    &lt;stat name='users/online'/&gt;
  &lt;/query&gt;
&lt;/iq&gt;
</PRE></LI><LI CLASS="li-itemize">You can request the total number of registered users on all virtual hosts
by sending:
<PRE CLASS="verbatim">&lt;iq to='example.org' type='get'&gt;
  &lt;query xmlns='http://jabber.org/protocol/stats'&gt;
    &lt;stat name='users/all-hosts/total'/&gt;
  &lt;/query&gt;
&lt;/iq&gt;
</PRE></LI></UL><!--TOC subsection <TT>mod_time</TT>-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc49">3.3.20</A>&#XA0;&#XA0;<TT>mod_time</TT></H3><!--SEC END --><P>
<A NAME="modtime"></A>
</P><P>This module features support for Entity Time (<A HREF="http://www.xmpp.org/extensions/xep-0090.html">XEP-0090</A>). By using this XEP,
you are able to discover the time at another entity's location.</P><P>Options:
</P><DL CLASS="description"><DT CLASS="dt-description">
<B><TT>iqdisc</TT></B></DT><DD CLASS="dd-description"> This specifies 
the processing discipline for Entity Time (<TT>jabber:iq:time</TT>) IQ queries (see section&#XA0;<A HREF="#modiqdiscoption">3.3.2</A>).
</DD></DL><!--TOC subsection <TT>mod_vcard</TT>-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc50">3.3.21</A>&#XA0;&#XA0;<TT>mod_vcard</TT></H3><!--SEC END --><P>
<A NAME="modvcard"></A>
</P><P>This module allows end users to store and retrieve their vCard, and to retrieve
other users vCards, as defined in vcard-temp (<A HREF="http://www.xmpp.org/extensions/xep-0054.html">XEP-0054</A>). The module also
implements an uncomplicated Jabber User Directory based on the vCards of
these users. Moreover, it enables the server to send its vCard when queried.</P><P>Options:
</P><DL CLASS="description"><DT CLASS="dt-description">

<B><TT>host</TT></B></DT><DD CLASS="dd-description">  This option defines the Jabber ID of the
service. If the <TT>host</TT> option is not specified, the Jabber ID will be the
hostname of the virtual host with the prefix `<TT>vjud.</TT>'. The keyword "@HOST@"
is replaced at start time with the real virtual host name.

</DD><DT CLASS="dt-description"><B><TT>iqdisc</TT></B></DT><DD CLASS="dd-description"> This specifies 
the processing discipline for <TT>vcard-temp</TT> IQ queries (see section&#XA0;<A HREF="#modiqdiscoption">3.3.2</A>).
</DD><DT CLASS="dt-description"><B><TT>search</TT></B></DT><DD CLASS="dd-description">This option specifies whether the search
functionality is enabled (value: <TT>true</TT>) or disabled (value:
<TT>false</TT>). If disabled, the option <TT>host</TT> will be ignored and the
Jabber User Directory service will not appear in the Service Discovery item
list. The default value is <TT>true</TT>.
</DD><DT CLASS="dt-description"><B><TT>matches</TT></B></DT><DD CLASS="dd-description">With this option, the number of reported
search results can be limited. If the option's value is set to <TT>infinity</TT>,
all search results are reported. The default value is <TT>30</TT>.
</DD><DT CLASS="dt-description"><B><TT>allow_return_all</TT></B></DT><DD CLASS="dd-description">This option enables
you to specify if search operations with empty input fields should return all
users who added some information to their vCard. The default value is
<TT>false</TT>.
</DD><DT CLASS="dt-description"><B><TT>search_all_hosts</TT></B></DT><DD CLASS="dd-description">If this option is set
to <TT>true</TT>, search operations will apply to all virtual hosts. Otherwise
only the current host will be searched. The default value is <TT>true</TT>.
</DD></DL><P>Examples:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
In this first situation, search results are limited to twenty items,
every user who added information to their vCard will be listed when people
do an empty search, and only users from the current host will be returned:
<PRE CLASS="verbatim">  {modules,
   [
    ...
    {mod_vcard, [{search, true},
                 {matches, 20},
                 {allow_return_all, true},
                 {search_all_hosts, false}]},
    ...
   ]}.
</PRE></LI><LI CLASS="li-itemize">The second situation differs in a way that search results are not limited,
and that all virtual hosts will be searched instead of only the current one:
<PRE CLASS="verbatim">  {modules,
   [
    ...
    {mod_vcard, [{search, true},
                 {matches, infinity},
                 {allow_return_all, true}]},
    ...
   ]}.
</PRE></LI></UL><!--TOC subsection <TT>mod_vcard_ldap</TT>-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc51">3.3.22</A>&#XA0;&#XA0;<TT>mod_vcard_ldap</TT></H3><!--SEC END --><P>
<A NAME="modvcardldap"></A>
</P><P><TT>ejabberd</TT> can map LDAP attributes to vCard fields. This behaviour is
implemented in the <TT>mod_vcard_ldap</TT> module. This module does not depend on the
authentication method (see&#XA0;<A HREF="#ldapauth">3.2.5</A>). The <TT>mod_vcard_ldap</TT> module has
its own optional parameters. The first group of parameters has the same
meaning as the top-level LDAP parameters to set the authentication method:
<TT>ldap_servers</TT>, <TT>ldap_port</TT>, <TT>ldap_rootdn</TT>,
<TT>ldap_password</TT>, <TT>ldap_base</TT>, <TT>ldap_uids</TT>, and
<TT>ldap_filter</TT>. See section&#XA0;<A HREF="#ldapauth">3.2.5</A> for detailed information
about these options. If one of these options is not set, <TT>ejabberd</TT> will look
for the top-level option with the same name. The second group of parameters
consists of the following <TT>mod_vcard_ldap</TT>-specific options:</P><DL CLASS="description"><DT CLASS="dt-description">

<B><TT>host</TT></B></DT><DD CLASS="dd-description">  This option defines the Jabber ID of the
service. If the <TT>host</TT> option is not specified, the Jabber ID will be the
hostname of the virtual host with the prefix `<TT>vjud.</TT>'. The keyword "@HOST@"
is replaced at start time with the real virtual host name.

</DD><DT CLASS="dt-description"><B><TT>iqdisc</TT></B></DT><DD CLASS="dd-description"> This specifies 
the processing discipline for <TT>vcard-temp</TT> IQ queries (see section&#XA0;<A HREF="#modiqdiscoption">3.3.2</A>).
</DD><DT CLASS="dt-description"><B><TT>search</TT></B></DT><DD CLASS="dd-description">This option specifies whether the search
functionality is enabled (value: <TT>true</TT>) or disabled (value:
<TT>false</TT>). If disabled, the option <TT>host</TT> will be ignored and the
Jabber User Directory service will not appear in the Service Discovery item
list. The default value is <TT>true</TT>.
</DD><DT CLASS="dt-description"><B><TT>ldap_vcard_map</TT></B></DT><DD CLASS="dd-description">With this option you can
set the table that maps LDAP attributes to vCard fields. The format is:
<TT>[</TT><TT>Name_of_vCard_field, Pattern, List_of_LDAP_attributes</TT><TT>, ...]</TT>.
<TT>Name_of_vcard_field</TT> is the type name of the vCard as defined in
<A HREF="http://www.ietf.org/rfc/rfc2426.txt">RFC 2426</A>. <TT>Pattern</TT> is a
string which contains pattern variables <TT>"%u"</TT>, <TT>"%d"</TT> or
<TT>"%s"</TT>. <TT>List_of_LDAP_attributes</TT> is the list containing LDAP
attributes. The pattern variables <TT>"%s"</TT> will be sequentially replaced
with the values of LDAP attributes from <TT>List_of_LDAP_attributes</TT>,
<TT>"%u"</TT> will be replaced with the user part of a JID, and <TT>"%d"</TT>
will be replaced with the domain part of a JID. The default is:
<PRE CLASS="verbatim">  [{"NICKNAME", "%u", []},
   {"FN", "%s", ["displayName"]},
   {"FAMILY", "%s", ["sn"]},
   {"GIVEN", "%s", ["givenName"]},
   {"MIDDLE", "%s", ["initials"]},
   {"ORGNAME", "%s", ["o"]},
   {"ORGUNIT", "%s", ["ou"]},
   {"CTRY", "%s", ["c"]},
   {"LOCALITY", "%s", ["l"]},
   {"STREET", "%s", ["street"]},
   {"REGION", "%s", ["st"]},
   {"PCODE", "%s", ["postalCode"]},
   {"TITLE", "%s", ["title"]},
   {"URL", "%s", ["labeleduri"]},
   {"DESC", "%s", ["description"]},
   {"TEL", "%s", ["telephoneNumber"]},
   {"EMAIL", "%s", ["mail"]},
   {"BDAY", "%s", ["birthDay"]},
   {"ROLE", "%s", ["employeeType"]},
   {"PHOTO", "%s", ["jpegPhoto"]}]
</PRE></DD><DT CLASS="dt-description"><B><TT>ldap_search_fields</TT></B></DT><DD CLASS="dd-description">This option
defines the search form and the LDAP attributes to search within. The format
is: <TT>[</TT><TT>Name, Attribute</TT><TT>, ...]</TT>. <TT>Name</TT> is the name of a search form
field which will be automatically translated by using the translation
files (see <TT>msgs/*.msg</TT> for available words). <TT>Attribute</TT> is the
LDAP attribute or the pattern <TT>"%u"</TT>. The default is:
<PRE CLASS="verbatim">  [{"User", "%u"},
   {"Full Name", "displayName"},
   {"Given Name", "givenName"},
   {"Middle Name", "initials"},
   {"Family Name", "sn"},
   {"Nickname", "%u"},
   {"Birthday", "birthDay"},
   {"Country", "c"},
   {"City", "l"},
   {"Email", "mail"},
   {"Organization Name", "o"},
   {"Organization Unit", "ou"}]
</PRE></DD><DT CLASS="dt-description"><B><TT>ldap_search_reported</TT></B></DT><DD CLASS="dd-description">This option
defines which search fields should be reported. The format is:
<TT>[</TT><TT>Name, vCard_Name</TT><TT>, ...]</TT>. <TT>Name</TT> is the name of a search form
field which will be automatically translated by using the translation
files (see <TT>msgs/*.msg</TT> for available words). <TT>vCard_Name</TT> is the
vCard field name defined in the <TT>ldap_vcard_map</TT> option. The default
is:
<PRE CLASS="verbatim">  [{"Full Name", "FN"},
   {"Given Name", "GIVEN"},
   {"Middle Name", "MIDDLE"},
   {"Family Name", "FAMILY"},
   {"Nickname", "NICKNAME"},
   {"Birthday", "BDAY"},
   {"Country", "CTRY"},
   {"City", "LOCALITY"},
   {"Email", "EMAIL"},
   {"Organization Name", "ORGNAME"},
   {"Organization Unit", "ORGUNIT"}]
</PRE></DD></DL><P>Examples:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
<P>Let's say <TT>ldap.example.org</TT> is the name of our LDAP server. We have
users with their passwords in <TT>"ou=Users,dc=example,dc=org"</TT> directory.
Also we have addressbook, which contains users emails and their additional
infos in <TT>"ou=AddressBook,dc=example,dc=org"</TT> directory. Corresponding
authentication section should looks like this:</P><PRE CLASS="verbatim">  %% authentication method
  {auth_method, ldap}.
  %% DNS name of our LDAP server
  {ldap_servers, ["ldap.example.org"]}.
  %% We want to authorize users from 'shadowAccount' object class only
  {ldap_filter, "(objectClass=shadowAccount)"}.
</PRE><P>Now we want to use users LDAP-info as their vCards. We have four attributes
defined in our LDAP schema: <TT>"mail"</TT> &#X2014; email address, <TT>"givenName"</TT>
&#X2014; first name, <TT>"sn"</TT> &#X2014; second name, <TT>"birthDay"</TT> &#X2014; birthday.
Also we want users to search each other. Let's see how we can set it up:</P><PRE CLASS="verbatim">  {modules,
    ...
    {mod_vcard_ldap,
     [
      %% We use the same server and port, but want to bind anonymously because
      %% our LDAP server accepts anonymous requests to
      %% "ou=AddressBook,dc=example,dc=org" subtree.
      {ldap_rootdn, ""},
      {ldap_password, ""},
      %% define the addressbook's base
      {ldap_base, "ou=AddressBook,dc=example,dc=org"},
      %% uidattr: user's part of JID is located in the "mail" attribute
      %% uidattr_format: common format for our emails
      {ldap_uids, [{"mail","%u@mail.example.org"}]},
      %% We have to define empty filter here, because entries in addressbook does not
      %% belong to shadowAccount object class
      {ldap_filter, ""},
      %% Now we want to define vCard pattern
      {ldap_vcard_map,
       [{"NICKNAME", "%u", []}, % just use user's part of JID as his nickname
        {"GIVEN", "%s", ["givenName"]},
        {"FAMILY", "%s", ["sn"]},
        {"FN", "%s, %s", ["sn", "givenName"]}, % example: "Smith, John"
        {"EMAIL", "%s", ["mail"]},
        {"BDAY", "%s", ["birthDay"]}]},
      %% Search form
      {ldap_search_fields,
       [{"User", "%u"},
        {"Name", "givenName"},
        {"Family Name", "sn"},
        {"Email", "mail"},
        {"Birthday", "birthDay"}]},
      %% vCard fields to be reported
      %% Note that JID is always returned with search results
      {ldap_search_reported,
       [{"Full Name", "FN"},
        {"Nickname", "NICKNAME"},
        {"Birthday", "BDAY"}]}
    ]}
    ...
  }.
</PRE><P>Note that <TT>mod_vcard_ldap</TT> module checks an existence of the user before
searching his info in LDAP.</P></LI><LI CLASS="li-itemize"><TT>ldap_vcard_map</TT> example:
<PRE CLASS="verbatim">  {ldap_vcard_map,
   [{"NICKNAME", "%u", []},
    {"FN", "%s", ["displayName"]},
    {"CTRY", "Russia", []},
    {"EMAIL", "%u@%d", []},
    {"DESC", "%s\n%s", ["title", "description"]}
   ]},
</PRE></LI><LI CLASS="li-itemize"><TT>ldap_search_fields</TT> example:
<PRE CLASS="verbatim">  {ldap_search_fields,
   [{"User", "uid"},
    {"Full Name", "displayName"},
    {"Email", "mail"}
   ]},
</PRE></LI><LI CLASS="li-itemize"><TT>ldap_search_reported</TT> example:
<PRE CLASS="verbatim">  {ldap_search_reported,
   [{"Full Name", "FN"},
    {"Email", "EMAIL"},
    {"Birthday", "BDAY"},
    {"Nickname", "NICKNAME"}
   ]},
</PRE></LI></UL><!--TOC subsection <TT>mod_version</TT>-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc52">3.3.23</A>&#XA0;&#XA0;<TT>mod_version</TT></H3><!--SEC END --><P>
<A NAME="modversion"></A>
</P><P>This module implements Software Version (<A HREF="http://www.xmpp.org/extensions/xep-0092.html">XEP-0092</A>). Consequently, it
answers <TT>ejabberd</TT>'s version when queried.</P><P>Options:
</P><DL CLASS="description"><DT CLASS="dt-description">
<B><TT>show_os</TT></B></DT><DD CLASS="dd-description">Should the operating system be revealed or not.
The default value is <TT>true</TT>.
</DD><DT CLASS="dt-description"><B><TT>iqdisc</TT></B></DT><DD CLASS="dd-description"> This specifies 
the processing discipline for Software Version (<TT>jabber:iq:version</TT>) IQ queries (see section&#XA0;<A HREF="#modiqdiscoption">3.3.2</A>).
</DD></DL><!--TOC chapter Managing an ejabberd server-->
<H1 CLASS="chapter"><!--SEC ANCHOR --><A NAME="htoc53">Chapter&#XA0;4</A>&#XA0;&#XA0;Managing an ejabberd server</H1><!--SEC END --><!--TOC section Online Configuration and Monitoring-->
<H2 CLASS="section"><!--SEC ANCHOR --><A NAME="htoc54">4.1</A>&#XA0;&#XA0;Online Configuration and Monitoring</H2><!--SEC END --><P>
<A NAME="onlineconfig"></A></P><!--TOC subsection Web Interface-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc55">4.1.1</A>&#XA0;&#XA0;Web Interface</H3><!--SEC END --><P>
<A NAME="webinterface"></A>
</P><P>To perform online configuration of <TT>ejabberd</TT> you need to enable the
<TT>ejabberd_http</TT> listener with the option <TT>web_admin</TT> (see
section&#XA0;<A HREF="#listened">3.1.3</A>). Then you can open 
<CODE>http://server:port/admin/</CODE> in your favourite web browser. You
will be asked to enter the username (the <EM>full</EM> Jabber ID) and password
of an <TT>ejabberd</TT> user with administrator rights. After authentication
you will see a page similar to figure&#XA0;<A HREF="#fig:webadmmain">4.1</A>.</P><BLOCKQUOTE CLASS="figure"><DIV CLASS="center"><DIV CLASS="center"><HR WIDTH="80%" SIZE=2></DIV>

<IMG SRC="webadmmain.png" ALT="webadmmain.png">


<DIV CLASS="caption"><TABLE CELLSPACING=6 CELLPADDING=0><TR><TD VALIGN=top ALIGN=left>Figure 4.1: Top page from the web interface</TD></TR>
</TABLE></DIV>
<A NAME="fig:webadmmain"></A>
<DIV CLASS="center"><HR WIDTH="80%" SIZE=2></DIV></DIV></BLOCKQUOTE><P>
Here you can edit access restrictions, manage users, create backups,
manage the database, enable/disable ports listened for, view server
statistics,&#X2026;</P><P>Examples:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
You can serve the web interface on the same port as the
HTTP Polling interface. In this example
you should point your web browser to <CODE>http://example.org:5280/admin/</CODE> to
administer all virtual hosts or to
<CODE>http://example.org:5280/admin/server/example.com/</CODE> to administer only
the virtual host <TT>example.com</TT>. Before you get access to the web interface
you need to enter as username, the JID and password from a registered user
that is allowed to configure <TT>ejabberd</TT>. In this example you can enter as
username `<TT>admin@example.net</TT>' to administer all virtual hosts (first
URL). If you log in with `<TT>admin@example.com</TT>' on<BR>
 <CODE>http://example.org:5280/admin/server/example.com/</CODE> you can only
administer the virtual host <TT>example.com</TT>.
<PRE CLASS="verbatim">  ...
  {acl, admins, {user, "admin", "example.net"}}.
  {host_config, "example.com", [{acl, admins, {user, "admin", "example.com"}}]}.
  {access, configure, [{allow, admins}]}.
  ...
  {hosts, ["example.org"]}.
  ...
  {listen,
   [...
    {5280, ejabberd_http, [http_poll, web_admin]},
    ...
   ]
  }.
</PRE></LI><LI CLASS="li-itemize">For security reasons, you can serve the web interface on a secured
connection, on a port differing from the HTTP Polling interface, and bind it
to the internal LAN IP. The web interface will be accessible by pointing your
web browser to <CODE>https://192.168.1.1:5280/admin/</CODE>:
<PRE CLASS="verbatim">  ...
  {hosts, ["example.org"]}.
  ...
  {listen,
   [...
    {5270, ejabberd_http,    [http_poll]},
    {5280, ejabberd_http,    [web_admin, {ip, {192, 168, 1, 1}},
                              tls, {certfile, "/usr/local/etc/server.pem"}]},
    ...
   ]
  }.
</PRE></LI></UL><!--TOC subsection <TT>ejabberdctl</TT>-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc56">4.1.2</A>&#XA0;&#XA0;<TT>ejabberdctl</TT></H3><!--SEC END --><P>
<A NAME="ejabberdctl"></A>
</P><P>It is possible to do some administration operations using the command
line tool <TT>ejabberdctl</TT>. You can list all available options by
running <TT>ejabberdctl</TT> without arguments:
</P><PRE CLASS="verbatim">% ejabberdctl
Usage: ejabberdctl node command

Available commands:
  status                        get ejabberd status
  stop                          stop ejabberd
  restart                       restart ejabberd
  reopen-log                    reopen log file
  register user server password register a user
  unregister user server        unregister a user
  backup file                   store a database backup to file
  restore file                  restore a database backup from file
  install-fallback file         install a database fallback from file
  dump file                     dump a database to a text file
  load file                     restore a database from a text file
  import-file file              import user data from jabberd 1.4 spool file
  import-dir dir                import user data from jabberd 1.4 spool directory
  registered-users              list all registered users
  delete-expired-messages       delete expired offline messages from database

Example:
  ejabberdctl ejabberd@host restart
</PRE><P>Additional information:
</P><DL CLASS="description"><DT CLASS="dt-description">
<B><TT>reopen-log </TT></B></DT><DD CLASS="dd-description"> If you use a tool to rotate logs, you have to configure it
so that this command is executed after each rotation.
</DD><DT CLASS="dt-description"><B><TT>backup, restore, install-fallback, dump, load</TT></B></DT><DD CLASS="dd-description"> You can use these
commands to create and restore backups. 
</DD><DT CLASS="dt-description"><B><TT>import-file, import-dir</TT></B></DT><DD CLASS="dd-description"> 
These options can be used to migrate from other Jabber/XMPP servers. There
exist tutorials to <A HREF="http://ejabberd.jabber.ru/migrate-to-ejabberd">migrate from other software to ejabberd</A>.
</DD><DT CLASS="dt-description"><B><TT>delete-expired-messages</TT></B></DT><DD CLASS="dd-description"> This option can be used to delete old messages
in offline storage. This might be useful when the number of offline messages
is very high.
</DD></DL><!--TOC chapter Securing ejabberd-->
<H1 CLASS="chapter"><!--SEC ANCHOR --><A NAME="htoc57">Chapter&#XA0;5</A>&#XA0;&#XA0;Securing ejabberd</H1><!--SEC END --><!--TOC section Firewall Settings-->
<H2 CLASS="section"><!--SEC ANCHOR --><A NAME="htoc58">5.1</A>&#XA0;&#XA0;Firewall Settings</H2><!--SEC END --><P>
<A NAME="firewall"></A>
</P><P>You need to take the following TCP ports in mind when configuring your firewall:
</P><BLOCKQUOTE CLASS="table"><DIV CLASS="center"><DIV CLASS="center"><HR WIDTH="80%" SIZE=2></DIV>
<TABLE BORDER=1 CELLSPACING=0 CELLPADDING=1><TR><TD ALIGN=left NOWRAP>Port</TD><TD ALIGN=left NOWRAP>Description</TD></TR>
<TR><TD ALIGN=left NOWRAP>5222</TD><TD ALIGN=left NOWRAP>SASL and unencrypted c2s connections.</TD></TR>
<TR><TD ALIGN=left NOWRAP>5223</TD><TD ALIGN=left NOWRAP>Obsolete SSL c2s connections.</TD></TR>
<TR><TD ALIGN=left NOWRAP>5269</TD><TD ALIGN=left NOWRAP>s2s connections.</TD></TR>
<TR><TD ALIGN=left NOWRAP>4369</TD><TD ALIGN=left NOWRAP>Only for clustering (see&#XA0;<A HREF="#clustering">7</A>).</TD></TR>
<TR><TD ALIGN=left NOWRAP>port range</TD><TD ALIGN=left NOWRAP>Only for clustring (see&#XA0;<A HREF="#clustering">7</A>). This range
is configurable (see&#XA0;<A HREF="#start">2.4.4</A>).</TD></TR>
</TABLE>
<DIV CLASS="center"><HR WIDTH="80%" SIZE=2></DIV></DIV></BLOCKQUOTE><!--TOC chapter Integrating ejabberd with other Instant Messaging servers-->
<H1 CLASS="chapter"><!--SEC ANCHOR --><A NAME="htoc59">Chapter&#XA0;6</A>&#XA0;&#XA0;Integrating ejabberd with other Instant Messaging servers</H1><!--SEC END --><!--TOC section SRV Records-->
<H2 CLASS="section"><!--SEC ANCHOR --><A NAME="htoc60">6.1</A>&#XA0;&#XA0;SRV Records</H2><!--SEC END --><P>
<A NAME="srv"></A>
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
General information:
<A HREF="http://en.wikipedia.org/wiki/SRV_record">SRV record</A>
</LI><LI CLASS="li-itemize">Practical information:
<A HREF="http://jabberd.jabberstudio.org/2/docs/section05.html#5_7">Setting DNS SRV Records</A>
</LI></UL><!--TOC chapter Clustering-->
<H1 CLASS="chapter"><!--SEC ANCHOR --><A NAME="htoc61">Chapter&#XA0;7</A>&#XA0;&#XA0;Clustering</H1><!--SEC END --><P>
<A NAME="clustering"></A>
</P><!--TOC section How it Works-->
<H2 CLASS="section"><!--SEC ANCHOR --><A NAME="htoc62">7.1</A>&#XA0;&#XA0;How it Works</H2><!--SEC END --><P>
<A NAME="howitworks"></A>
</P><P>A Jabber domain is served by one or more <TT>ejabberd</TT> nodes. These nodes can
be run on different machines that are connected via a network. They all
must have the ability to connect to port 4369 of all another nodes, and must
have the same magic cookie (see Erlang/OTP documentation, in other words the
file <TT>~ejabberd/.erlang.cookie</TT> must be the same on all nodes). This is
needed because all nodes exchange information about connected users, s2s
connections, registered services, etc&#X2026;</P><P>Each <TT>ejabberd</TT> node has the following modules:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
router,
</LI><LI CLASS="li-itemize">local router,
</LI><LI CLASS="li-itemize">session manager,
</LI><LI CLASS="li-itemize">s2s manager.
</LI></UL><!--TOC subsection Router-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc63">7.1.1</A>&#XA0;&#XA0;Router</H3><!--SEC END --><P>
<A NAME="router"></A>
</P><P>This module is the main router of Jabber packets on each node. It
routes them based on their destination's domains. It uses a global
routing table. The domain of the packet's destination is searched in the
routing table, and if it is found, the packet is routed to the
appropriate process. If not, it is sent to the s2s manager.</P><!--TOC subsection Local Router-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc64">7.1.2</A>&#XA0;&#XA0;Local Router</H3><!--SEC END --><P>
<A NAME="localrouter"></A>
</P><P>This module routes packets which have a destination domain equal to
one of this server's host names. If the destination JID has a non-empty user
part, it is routed to the session manager, otherwise it is processed depending
on its content.</P><!--TOC subsection Session Manager-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc65">7.1.3</A>&#XA0;&#XA0;Session Manager</H3><!--SEC END --><P>
<A NAME="sessionmanager"></A>
</P><P>This module routes packets to local users. It looks up to which user
resource a packet must be sent via a presence table. Then the packet is
either routed to the appropriate c2s process, or stored in offline
storage, or bounced back.</P><!--TOC subsection s2s Manager-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc66">7.1.4</A>&#XA0;&#XA0;s2s Manager</H3><!--SEC END --><P>
<A NAME="s2smanager"></A>
</P><P>This module routes packets to other Jabber servers. First, it
checks if an opened s2s connection from the domain of the packet's
source to the domain of the packet's destination exists. If that is the case,
the s2s manager routes the packet to the process
serving this connection, otherwise a new connection is opened.</P><!--TOC section Clustering Setup-->
<H2 CLASS="section"><!--SEC ANCHOR --><A NAME="htoc67">7.2</A>&#XA0;&#XA0;Clustering Setup</H2><!--SEC END --><P>
<A NAME="cluster"></A>
</P><P>Suppose you already configured <TT>ejabberd</TT> on one machine named (<TT>first</TT>),
and you need to setup another one to make an <TT>ejabberd</TT> cluster. Then do
following steps:</P><OL CLASS="enumerate" type=1><LI CLASS="li-enumerate">
Copy <CODE>~ejabberd/.erlang.cookie</CODE> file from <TT>first</TT> to
<TT>second</TT>.<P>(alt) You can also add `<CODE>-cookie content_of_.erlang.cookie</CODE>'
option to all `<TT>erl</TT>' commands below.</P></LI><LI CLASS="li-enumerate">On <TT>second</TT> run the following command as the <TT>ejabberd</TT> daemon user,
in the working directory of <TT>ejabberd</TT>:<PRE CLASS="verbatim">erl -sname ejabberd \
    -mnesia extra_db_nodes "['ejabberd@first']" \
    -s mnesia
</PRE><P>This will start Mnesia serving the same database as <TT>ejabberd@first</TT>.
You can check this by running the command `<CODE>mnesia:info().</CODE>'. You
should see a lot of remote tables and a line like the following:</P><PRE CLASS="verbatim">running db nodes   = [ejabberd@first, ejabberd@second]
</PRE></LI><LI CLASS="li-enumerate">Now run the following in the same `<TT>erl</TT>' session:<PRE CLASS="verbatim">mnesia:change_table_copy_type(schema, node(), disc_copies).
</PRE><P>This will create local disc storage for the database.</P><P>(alt) Change storage type of the <TT>scheme</TT> table to `RAM and disc
copy' on the second node via the web interface.</P></LI><LI CLASS="li-enumerate">Now you can add replicas of various tables to this node with
`<CODE>mnesia:add_table_copy</CODE>' or
`<CODE>mnesia:change_table_copy_type</CODE>' as above (just replace
`<CODE>schema</CODE>' with another table name and `<CODE>disc_copies</CODE>'
can be replaced with `<CODE>ram_copies</CODE>' or
`<CODE>disc_only_copies</CODE>').<P>Which tables to replicate is very dependant on your needs, you can get
some hints from the command `<CODE>mnesia:info().</CODE>', by looking at the
size of tables and the default storage type for each table on 'first'.</P><P>Replicating a table makes lookups in this table faster on this node.
Writing, on the other hand, will be slower. And of course if machine with one
of the replicas is down, other replicas will be used.</P><P>Also <A HREF="http://www.erlang.se/doc/doc-5.4.9/lib/mnesia-4.2.2/doc/html/Mnesia_chap5.html#5.3">section 5.3 (Table Fragmentation) of Mnesia User's Guide</A> can be helpful.
</P><P>(alt) Same as in previous item, but for other tables.</P></LI><LI CLASS="li-enumerate">Run `<CODE>init:stop().</CODE>' or just `<CODE>q().</CODE>' to exit from
the Erlang shell. This probably can take some time if Mnesia has not yet
transfered and processed all data it needed from <TT>first</TT>.</LI><LI CLASS="li-enumerate">Now run <TT>ejabberd</TT> on <TT>second</TT> with almost the same config as
on <TT>first</TT> (you probably do not need to duplicate `<CODE>acl</CODE>'
and `<CODE>access</CODE>' options &#X2014; they will be taken from
<TT>first</TT>, and <CODE>mod_muc</CODE> and <CODE>mod_irc</CODE> should be
enabled only on one machine in the cluster).
</LI></OL><P>You can repeat these steps for other machines supposed to serve this
domain.</P><!--TOC section Service Load-Balancing-->
<H2 CLASS="section"><!--SEC ANCHOR --><A NAME="htoc68">7.3</A>&#XA0;&#XA0;Service Load-Balancing</H2><!--SEC END --><!--TOC subsection Components Load-Balancing-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc69">7.3.1</A>&#XA0;&#XA0;Components Load-Balancing</H3><!--SEC END --><P>
<A NAME="componentlb"></A>
</P><!--TOC subsection Domain Load-Balancing Algorithm-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc70">7.3.2</A>&#XA0;&#XA0;Domain Load-Balancing Algorithm</H3><!--SEC END --><P>
<A NAME="domainlb"></A>
</P><P><TT>ejabberd</TT> includes an algorithm to load balance the components that are plugged on an ejabberd cluster. It means that you can plug one or several instances of the same component on each ejabberd cluster and that the traffic will be automatically distributed.</P><P>The default distribution algorithm try to deliver to a local instance of a component. If several local instances are available, one instance is choosen randomly. If no instance is available locally, one instance is choosen randomly among the remote component instances.</P><P>If you need a different behaviour, you can change the load balancing behaviour with the option <TT>domain_balancing</TT>. The syntax of the option is the following:</P><PRE CLASS="verbatim"> {domain_balancing, "component.example.com", &lt;balancing_criterium&gt;}.                                   
</PRE><P>Several balancing criteria are available:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
<TT>destination</TT>: the full JID of the packet <TT>to</TT> attribute is used.
</LI><LI CLASS="li-itemize"><TT>source</TT>: the full JID of the packet <TT>from</TT> attribute is used.
</LI><LI CLASS="li-itemize"><TT>bare_destination</TT>: the bare JID (without resource) of the packet <TT>to</TT> attribute is used.
</LI><LI CLASS="li-itemize"><TT>bare_source</TT>: the bare JID (without resource) of the packet <TT>from</TT> attribute is used.
</LI></UL><P>If the value corresponding to the criterium is the same, the same component instance in the cluster will be used.</P><!--TOC subsection Load-Balancing Buckets-->
<H3 CLASS="subsection"><!--SEC ANCHOR --><A NAME="htoc71">7.3.3</A>&#XA0;&#XA0;Load-Balancing Buckets</H3><!--SEC END --><P>
<A NAME="lbbuckets"></A>
</P><P>When there is a risk of failure for a given component, domain balancing can cause service trouble. If one component is failling the service will not work correctly unless the sessions are rebalanced.</P><P>In this case, it is best to limit the problem to the sessions handled by the failling component. This is what the <TT>domain_balancing_component_number</TT> option does, making the load balancing algorithm not dynamic, but sticky on a fix number of component instances.</P><P>The syntax is the following:
</P><PRE CLASS="verbatim">    {domain_balancing_component_number, "component.example.com", N}
</PRE><!--TOC chapter Debugging-->
<H1 CLASS="chapter"><!--SEC ANCHOR --><A NAME="htoc72">Chapter&#XA0;8</A>&#XA0;&#XA0;Debugging</H1><!--SEC END --><P>
<A NAME="debugging"></A>
</P><!--TOC section Watchdog alerts-->
<H2 CLASS="section"><!--SEC ANCHOR --><A NAME="htoc73">8.1</A>&#XA0;&#XA0;Watchdog alerts</H2><!--SEC END --><P>
<A NAME="watchdog"></A>
</P><P>ejabberd includes a watchdog mechanism to notify admins in realtime
through XMPP when any process consumes too much memory.</P><P>To enable the watchdog, add the <TT>watchdog_admins</TT>
 option in the config file:</P><PRE CLASS="verbatim">{watchdog_admins, [``admin@localhost'']}.
</PRE><!--TOC chapter Internationalization and Localization-->
<H1 CLASS="chapter"><!--SEC ANCHOR --><A NAME="htoc74">Appendix&#XA0;A</A>&#XA0;&#XA0;Internationalization and Localization</H1><!--SEC END --><P>
<A NAME="i18nl10n"></A>
</P><P>All built-in modules support the <TT>xml:lang</TT> attribute inside IQ queries.
Figure&#XA0;<A HREF="#fig:discorus">A.1</A>, for example, shows the reply to the following query:
</P><PRE CLASS="verbatim">  &lt;iq id='5'
      to='example.org'
      type='get'
      xml:lang='ru'&gt;
    &lt;query xmlns='http://jabber.org/protocol/disco#items'/&gt;
  &lt;/iq&gt;
</PRE><BLOCKQUOTE CLASS="figure"><DIV CLASS="center"><DIV CLASS="center"><HR WIDTH="80%" SIZE=2></DIV>

<IMG SRC="discorus.png" ALT="discorus.png">


<DIV CLASS="caption"><TABLE CELLSPACING=6 CELLPADDING=0><TR><TD VALIGN=top ALIGN=left>Figure A.1: Service Discovery when <TT>xml:lang='ru'</TT></TD></TR>
</TABLE></DIV>
<A NAME="fig:discorus"></A>
<DIV CLASS="center"><HR WIDTH="80%" SIZE=2></DIV></DIV></BLOCKQUOTE><P>The web interface also supports the <CODE>Accept-Language</CODE> HTTP header (compare
figure&#XA0;<A HREF="#fig:webadmmainru">A.2</A> with figure&#XA0;<A HREF="#fig:webadmmain">4.1</A>)</P><BLOCKQUOTE CLASS="figure"><DIV CLASS="center"><DIV CLASS="center"><HR WIDTH="80%" SIZE=2></DIV>

<IMG SRC="webadmmainru.png" ALT="webadmmainru.png">


<DIV CLASS="caption"><TABLE CELLSPACING=6 CELLPADDING=0><TR><TD VALIGN=top ALIGN=left>Figure A.2: Top page from the web interface with HTTP header
`Accept-Language: ru'</TD></TR>
</TABLE></DIV>
<A NAME="fig:webadmmainru"></A>
<DIV CLASS="center"><HR WIDTH="80%" SIZE=2></DIV></DIV></BLOCKQUOTE><!--TOC chapter Release Notes-->
<H1 CLASS="chapter"><!--SEC ANCHOR --><A NAME="htoc75">Appendix&#XA0;B</A>&#XA0;&#XA0;Release Notes</H1><!--SEC END --><P>
<A NAME="releasenotes"></A>
</P><P>Release notes are available from <A HREF="http://www.process-one.net/en/ejabberd/release_notes/">ejabberd Home Page</A></P><!--TOC chapter Acknowledgements-->
<H1 CLASS="chapter"><!--SEC ANCHOR --><A NAME="htoc76">Appendix&#XA0;C</A>&#XA0;&#XA0;Acknowledgements</H1><!--SEC END --><P>
<A NAME="acknowledgements"></A>
Thanks to all people who contributed to this guide:
</P><UL CLASS="itemize"><LI CLASS="li-itemize">
Alexey Shchepin (<A HREF="xmpp:aleksey@jabber.ru"><TT>xmpp:aleksey@jabber.ru</TT></A>)
</LI><LI CLASS="li-itemize">Badlop (<A HREF="xmpp:badlop@jabberes.org"><TT>xmpp:badlop@jabberes.org</TT></A>)
</LI><LI CLASS="li-itemize">Evgeniy Khramtsov (<A HREF="xmpp:xram@jabber.ru"><TT>xmpp:xram@jabber.ru</TT></A>)
</LI><LI CLASS="li-itemize">Florian Zumbiehl (<A HREF="xmpp:florz@florz.de"><TT>xmpp:florz@florz.de</TT></A>)
</LI><LI CLASS="li-itemize">Michael Grigutsch (<A HREF="xmpp:migri@jabber.i-pobox.net"><TT>xmpp:migri@jabber.i-pobox.net</TT></A>)
</LI><LI CLASS="li-itemize">Mickael Remond (<A HREF="xmpp:mremond@erlang-projects.org"><TT>xmpp:mremond@erlang-projects.org</TT></A>)
</LI><LI CLASS="li-itemize">Sander Devrieze (<A HREF="xmpp:sander@devrieze.dyndns.org"><TT>xmpp:sander@devrieze.dyndns.org</TT></A>)
</LI><LI CLASS="li-itemize">Sergei Golovan (<A HREF="xmpp:sgolovan@nes.ru"><TT>xmpp:sgolovan@nes.ru</TT></A>)
</LI><LI CLASS="li-itemize">Vsevolod Pelipas (<A HREF="xmpp:vsevoload@jabber.ru"><TT>xmpp:vsevoload@jabber.ru</TT></A>)
</LI></UL><!--TOC chapter Copyright Information-->
<H1 CLASS="chapter"><!--SEC ANCHOR --><A NAME="htoc77">Appendix&#XA0;D</A>&#XA0;&#XA0;Copyright Information</H1><!--SEC END --><P>
<A NAME="copyright"></A></P><P>Ejabberd Installation and Operation Guide.<BR>
Copyright &#XA9; 2003 &#X2014; 2007 Process-one</P><P>This document is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.</P><P>This document is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.</P><P>You should have received a copy of the GNU General Public License along with
this document; if not, write to the Free Software Foundation, Inc., 51 Franklin
Street, Fifth Floor, Boston, MA 02110-1301, USA.</P><!--CUT END -->
<!--HTMLFOOT-->
<!--ENDHTML-->
<!--FOOTER-->
<HR SIZE=2><BLOCKQUOTE CLASS="quote"><EM>This document was translated from L<sup>A</sup>T<sub>E</sub>X by
</EM><A HREF="http://hevea.inria.fr/index.html"><EM>H</EM><EM><FONT SIZE=2><sup>E</sup></FONT></EM><EM>V</EM><EM><FONT SIZE=2><sup>E</sup></FONT></EM><EM>A</EM></A><EM>.</EM></BLOCKQUOTE></BODY>
</HTML>