Linux ip-172-26-2-223 5.4.0-1018-aws #18-Ubuntu SMP Wed Jun 24 01:15:00 UTC 2020 x86_64
Apache
: 172.26.2.223 | : 18.223.109.25
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8.1.13
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www /
server /
apache /
manual /
mod /
[ HOME SHELL ]
Name
Size
Permission
Action
core.html
535
B
-rw-r--r--
core.html.de
238.47
KB
-rw-r--r--
core.html.en
293.44
KB
-rw-r--r--
core.html.es
262.51
KB
-rw-r--r--
core.html.fr.utf8
324.56
KB
-rw-r--r--
core.html.ja.utf8
254.26
KB
-rw-r--r--
core.html.tr.utf8
313.84
KB
-rw-r--r--
directive-dict.html
598
B
-rw-r--r--
directive-dict.html.en
17.79
KB
-rw-r--r--
directive-dict.html.es
19.47
KB
-rw-r--r--
directive-dict.html.fr.utf8
19.11
KB
-rw-r--r--
directive-dict.html.ja.utf8
20.06
KB
-rw-r--r--
directive-dict.html.ko.euc-kr
15.65
KB
-rw-r--r--
directive-dict.html.tr.utf8
19.11
KB
-rw-r--r--
directives.html
760
B
-rw-r--r--
directives.html.de
57.67
KB
-rw-r--r--
directives.html.en
57.54
KB
-rw-r--r--
directives.html.es
57.83
KB
-rw-r--r--
directives.html.fr.utf8
57.65
KB
-rw-r--r--
directives.html.ja.utf8
57.74
KB
-rw-r--r--
directives.html.ko.euc-kr
57.39
KB
-rw-r--r--
directives.html.tr.utf8
57.57
KB
-rw-r--r--
directives.html.zh-cn.utf8
57.41
KB
-rw-r--r--
event.html
201
B
-rw-r--r--
event.html.en
28.84
KB
-rw-r--r--
event.html.fr.utf8
31.36
KB
-rw-r--r--
index.html
720
B
-rw-r--r--
index.html.de
23.21
KB
-rw-r--r--
index.html.en
22.93
KB
-rw-r--r--
index.html.es
23.49
KB
-rw-r--r--
index.html.fr.utf8
25.14
KB
-rw-r--r--
index.html.ja.utf8
24.2
KB
-rw-r--r--
index.html.ko.euc-kr
22.37
KB
-rw-r--r--
index.html.tr.utf8
23.2
KB
-rw-r--r--
index.html.zh-cn.utf8
22.81
KB
-rw-r--r--
mod_access_compat.html
322
B
-rw-r--r--
mod_access_compat.html.en
28.41
KB
-rw-r--r--
mod_access_compat.html.fr.utf8
31.22
KB
-rw-r--r--
mod_access_compat.html.ja.utf8
30.51
KB
-rw-r--r--
mod_actions.html
489
B
-rw-r--r--
mod_actions.html.de
13.78
KB
-rw-r--r--
mod_actions.html.en
12.72
KB
-rw-r--r--
mod_actions.html.fr.utf8
13.32
KB
-rw-r--r--
mod_actions.html.ja.utf8
14.43
KB
-rw-r--r--
mod_actions.html.ko.euc-kr
12.37
KB
-rw-r--r--
mod_alias.html
479
B
-rw-r--r--
mod_alias.html.en
36.82
KB
-rw-r--r--
mod_alias.html.fr.utf8
40.04
KB
-rw-r--r--
mod_alias.html.ja.utf8
28.55
KB
-rw-r--r--
mod_alias.html.ko.euc-kr
22.95
KB
-rw-r--r--
mod_alias.html.tr.utf8
39.33
KB
-rw-r--r--
mod_allowmethods.html
223
B
-rw-r--r--
mod_allowmethods.html.en
8.09
KB
-rw-r--r--
mod_allowmethods.html.fr.utf8
8.4
KB
-rw-r--r--
mod_asis.html
386
B
-rw-r--r--
mod_asis.html.en
8.9
KB
-rw-r--r--
mod_asis.html.fr.utf8
9.18
KB
-rw-r--r--
mod_asis.html.ja.utf8
9.74
KB
-rw-r--r--
mod_asis.html.ko.euc-kr
8.47
KB
-rw-r--r--
mod_auth_basic.html
410
B
-rw-r--r--
mod_auth_basic.html.en
19.57
KB
-rw-r--r--
mod_auth_basic.html.fr.utf8
21.6
KB
-rw-r--r--
mod_auth_basic.html.ja.utf8
16.32
KB
-rw-r--r--
mod_auth_basic.html.ko.euc-kr
13.84
KB
-rw-r--r--
mod_auth_digest.html
319
B
-rw-r--r--
mod_auth_digest.html.en
20.11
KB
-rw-r--r--
mod_auth_digest.html.fr.utf8
21.9
KB
-rw-r--r--
mod_auth_digest.html.ko.euc-kr
20.41
KB
-rw-r--r--
mod_auth_form.html
217
B
-rw-r--r--
mod_auth_form.html.en
50.41
KB
-rw-r--r--
mod_auth_form.html.fr.utf8
54.73
KB
-rw-r--r--
mod_authn_anon.html
410
B
-rw-r--r--
mod_authn_anon.html.en
16.5
KB
-rw-r--r--
mod_authn_anon.html.fr.utf8
17.97
KB
-rw-r--r--
mod_authn_anon.html.ja.utf8
18.47
KB
-rw-r--r--
mod_authn_anon.html.ko.euc-kr
16.05
KB
-rw-r--r--
mod_authn_core.html
219
B
-rw-r--r--
mod_authn_core.html.en
16.42
KB
-rw-r--r--
mod_authn_core.html.fr.utf8
17.58
KB
-rw-r--r--
mod_authn_dbd.html
217
B
-rw-r--r--
mod_authn_dbd.html.en
15.09
KB
-rw-r--r--
mod_authn_dbd.html.fr.utf8
16.31
KB
-rw-r--r--
mod_authn_dbm.html
406
B
-rw-r--r--
mod_authn_dbm.html.en
12.69
KB
-rw-r--r--
mod_authn_dbm.html.fr.utf8
13.59
KB
-rw-r--r--
mod_authn_dbm.html.ja.utf8
13.07
KB
-rw-r--r--
mod_authn_dbm.html.ko.euc-kr
11.09
KB
-rw-r--r--
mod_authn_file.html
410
B
-rw-r--r--
mod_authn_file.html.en
11.42
KB
-rw-r--r--
mod_authn_file.html.fr.utf8
12.21
KB
-rw-r--r--
mod_authn_file.html.ja.utf8
12.44
KB
-rw-r--r--
mod_authn_file.html.ko.euc-kr
10.54
KB
-rw-r--r--
mod_authn_socache.html
225
B
-rw-r--r--
mod_authn_socache.html.en
18.82
KB
-rw-r--r--
mod_authn_socache.html.fr.utf8
20.67
KB
-rw-r--r--
mod_authnz_fcgi.html
221
B
-rw-r--r--
mod_authnz_fcgi.html.en
26.98
KB
-rw-r--r--
mod_authnz_fcgi.html.fr.utf8
29.33
KB
-rw-r--r--
mod_authnz_ldap.html
221
B
-rw-r--r--
mod_authnz_ldap.html.en
84.3
KB
-rw-r--r--
mod_authnz_ldap.html.fr.utf8
86.91
KB
-rw-r--r--
mod_authz_core.html
219
B
-rw-r--r--
mod_authz_core.html.en
37.04
KB
-rw-r--r--
mod_authz_core.html.fr.utf8
40.05
KB
-rw-r--r--
mod_authz_dbd.html
217
B
-rw-r--r--
mod_authz_dbd.html.en
18.2
KB
-rw-r--r--
mod_authz_dbd.html.fr.utf8
19.98
KB
-rw-r--r--
mod_authz_dbm.html
313
B
-rw-r--r--
mod_authz_dbm.html.en
12.86
KB
-rw-r--r--
mod_authz_dbm.html.fr.utf8
13.75
KB
-rw-r--r--
mod_authz_dbm.html.ko.euc-kr
10.39
KB
-rw-r--r--
mod_authz_groupfile.html
430
B
-rw-r--r--
mod_authz_groupfile.html.en
10.4
KB
-rw-r--r--
mod_authz_groupfile.html.fr.ut...
10.93
KB
-rw-r--r--
mod_authz_groupfile.html.ja.ut...
9.9
KB
-rw-r--r--
mod_authz_groupfile.html.ko.eu...
8.8
KB
-rw-r--r--
mod_authz_host.html
219
B
-rw-r--r--
mod_authz_host.html.en
13.39
KB
-rw-r--r--
mod_authz_host.html.fr.utf8
14.35
KB
-rw-r--r--
mod_authz_owner.html
414
B
-rw-r--r--
mod_authz_owner.html.en
11.29
KB
-rw-r--r--
mod_authz_owner.html.fr.utf8
11.92
KB
-rw-r--r--
mod_authz_owner.html.ja.utf8
12.93
KB
-rw-r--r--
mod_authz_owner.html.ko.euc-kr
11.1
KB
-rw-r--r--
mod_authz_user.html
410
B
-rw-r--r--
mod_authz_user.html.en
8.11
KB
-rw-r--r--
mod_authz_user.html.fr.utf8
8.37
KB
-rw-r--r--
mod_authz_user.html.ja.utf8
7.39
KB
-rw-r--r--
mod_authz_user.html.ko.euc-kr
6.85
KB
-rw-r--r--
mod_autoindex.html
499
B
-rw-r--r--
mod_autoindex.html.en
60.78
KB
-rw-r--r--
mod_autoindex.html.fr.utf8
67.28
KB
-rw-r--r--
mod_autoindex.html.ja.utf8
64.92
KB
-rw-r--r--
mod_autoindex.html.ko.euc-kr
50.19
KB
-rw-r--r--
mod_autoindex.html.tr.utf8
66.14
KB
-rw-r--r--
mod_brotli.html
211
B
-rw-r--r--
mod_brotli.html.en
21.14
KB
-rw-r--r--
mod_brotli.html.fr.utf8
22.5
KB
-rw-r--r--
mod_buffer.html
211
B
-rw-r--r--
mod_buffer.html.en
9.06
KB
-rw-r--r--
mod_buffer.html.fr.utf8
9.57
KB
-rw-r--r--
mod_cache.html
390
B
-rw-r--r--
mod_cache.html.en
68.08
KB
-rw-r--r--
mod_cache.html.fr.utf8
74.14
KB
-rw-r--r--
mod_cache.html.ja.utf8
52.35
KB
-rw-r--r--
mod_cache.html.ko.euc-kr
38.51
KB
-rw-r--r--
mod_cache_disk.html
410
B
-rw-r--r--
mod_cache_disk.html.en
20.1
KB
-rw-r--r--
mod_cache_disk.html.fr.utf8
21.26
KB
-rw-r--r--
mod_cache_disk.html.ja.utf8
18.36
KB
-rw-r--r--
mod_cache_disk.html.ko.euc-kr
15.72
KB
-rw-r--r--
mod_cache_socache.html
225
B
-rw-r--r--
mod_cache_socache.html.en
18.28
KB
-rw-r--r--
mod_cache_socache.html.fr.utf8
19.06
KB
-rw-r--r--
mod_cern_meta.html
313
B
-rw-r--r--
mod_cern_meta.html.en
11
KB
-rw-r--r--
mod_cern_meta.html.fr.utf8
11.56
KB
-rw-r--r--
mod_cern_meta.html.ko.euc-kr
10.54
KB
-rw-r--r--
mod_cgi.html
382
B
-rw-r--r--
mod_cgi.html.en
18.42
KB
-rw-r--r--
mod_cgi.html.fr.utf8
20.06
KB
-rw-r--r--
mod_cgi.html.ja.utf8
19.72
KB
-rw-r--r--
mod_cgi.html.ko.euc-kr
16.31
KB
-rw-r--r--
mod_cgid.html
386
B
-rw-r--r--
mod_cgid.html.en
11.56
KB
-rw-r--r--
mod_cgid.html.fr.utf8
12.15
KB
-rw-r--r--
mod_cgid.html.ja.utf8
12.2
KB
-rw-r--r--
mod_cgid.html.ko.euc-kr
10.7
KB
-rw-r--r--
mod_charset_lite.html
322
B
-rw-r--r--
mod_charset_lite.html.en
15.35
KB
-rw-r--r--
mod_charset_lite.html.fr.utf8
16.54
KB
-rw-r--r--
mod_charset_lite.html.ko.euc-k...
14.28
KB
-rw-r--r--
mod_data.html
207
B
-rw-r--r--
mod_data.html.en
7.49
KB
-rw-r--r--
mod_data.html.fr.utf8
7.68
KB
-rw-r--r--
mod_dav.html
382
B
-rw-r--r--
mod_dav.html.en
17.91
KB
-rw-r--r--
mod_dav.html.fr.utf8
19.45
KB
-rw-r--r--
mod_dav.html.ja.utf8
20.66
KB
-rw-r--r--
mod_dav.html.ko.euc-kr
17.71
KB
-rw-r--r--
mod_dav_fs.html
394
B
-rw-r--r--
mod_dav_fs.html.en
10.75
KB
-rw-r--r--
mod_dav_fs.html.fr.utf8
11.4
KB
-rw-r--r--
mod_dav_fs.html.ja.utf8
10.6
KB
-rw-r--r--
mod_dav_fs.html.ko.euc-kr
10.17
KB
-rw-r--r--
mod_dav_lock.html
307
B
-rw-r--r--
mod_dav_lock.html.en
9.76
KB
-rw-r--r--
mod_dav_lock.html.fr.utf8
10.32
KB
-rw-r--r--
mod_dav_lock.html.ja.utf8
10.51
KB
-rw-r--r--
mod_dbd.html
205
B
-rw-r--r--
mod_dbd.html.en
24.71
KB
-rw-r--r--
mod_dbd.html.fr.utf8
26.94
KB
-rw-r--r--
mod_deflate.html
398
B
-rw-r--r--
mod_deflate.html.en
28.35
KB
-rw-r--r--
mod_deflate.html.fr.utf8
30.4
KB
-rw-r--r--
mod_deflate.html.ja.utf8
31.06
KB
-rw-r--r--
mod_deflate.html.ko.euc-kr
26.17
KB
-rw-r--r--
mod_dialup.html
211
B
-rw-r--r--
mod_dialup.html.en
7.49
KB
-rw-r--r--
mod_dialup.html.fr.utf8
7.81
KB
-rw-r--r--
mod_dir.html
469
B
-rw-r--r--
mod_dir.html.en
22.39
KB
-rw-r--r--
mod_dir.html.fr.utf8
24.43
KB
-rw-r--r--
mod_dir.html.ja.utf8
19.66
KB
-rw-r--r--
mod_dir.html.ko.euc-kr
16.53
KB
-rw-r--r--
mod_dir.html.tr.utf8
23.66
KB
-rw-r--r--
mod_dumpio.html
301
B
-rw-r--r--
mod_dumpio.html.en
9.62
KB
-rw-r--r--
mod_dumpio.html.fr.utf8
9.99
KB
-rw-r--r--
mod_dumpio.html.ja.utf8
10.32
KB
-rw-r--r--
mod_echo.html
386
B
-rw-r--r--
mod_echo.html.en
7.44
KB
-rw-r--r--
mod_echo.html.fr.utf8
7.58
KB
-rw-r--r--
mod_echo.html.ja.utf8
7.88
KB
-rw-r--r--
mod_echo.html.ko.euc-kr
7.55
KB
-rw-r--r--
mod_env.html
469
B
-rw-r--r--
mod_env.html.en
11.6
KB
-rw-r--r--
mod_env.html.fr.utf8
12.08
KB
-rw-r--r--
mod_env.html.ja.utf8
11.07
KB
-rw-r--r--
mod_env.html.ko.euc-kr
9.9
KB
-rw-r--r--
mod_env.html.tr.utf8
11.72
KB
-rw-r--r--
mod_example_hooks.html
325
B
-rw-r--r--
mod_example_hooks.html.en
11.2
KB
-rw-r--r--
mod_example_hooks.html.fr.utf8
11.9
KB
-rw-r--r--
mod_example_hooks.html.ko.euc-...
10.76
KB
-rw-r--r--
mod_expires.html
398
B
-rw-r--r--
mod_expires.html.en
16.71
KB
-rw-r--r--
mod_expires.html.fr.utf8
17.81
KB
-rw-r--r--
mod_expires.html.ja.utf8
18.29
KB
-rw-r--r--
mod_expires.html.ko.euc-kr
15.08
KB
-rw-r--r--
mod_ext_filter.html
410
B
-rw-r--r--
mod_ext_filter.html.en
18.22
KB
-rw-r--r--
mod_ext_filter.html.fr.utf8
19.71
KB
-rw-r--r--
mod_ext_filter.html.ja.utf8
22.86
KB
-rw-r--r--
mod_ext_filter.html.ko.euc-kr
18.94
KB
-rw-r--r--
mod_file_cache.html
316
B
-rw-r--r--
mod_file_cache.html.en
15.4
KB
-rw-r--r--
mod_file_cache.html.fr.utf8
17.64
KB
-rw-r--r--
mod_file_cache.html.ko.euc-kr
14.45
KB
-rw-r--r--
mod_filter.html
211
B
-rw-r--r--
mod_filter.html.en
31.22
KB
-rw-r--r--
mod_filter.html.fr.utf8
34.81
KB
-rw-r--r--
mod_headers.html
398
B
-rw-r--r--
mod_headers.html.en
33.85
KB
-rw-r--r--
mod_headers.html.fr.utf8
37.21
KB
-rw-r--r--
mod_headers.html.ja.utf8
25.01
KB
-rw-r--r--
mod_headers.html.ko.euc-kr
19.54
KB
-rw-r--r--
mod_heartbeat.html
217
B
-rw-r--r--
mod_heartbeat.html.en
9.55
KB
-rw-r--r--
mod_heartbeat.html.fr.utf8
9.8
KB
-rw-r--r--
mod_heartmonitor.html
223
B
-rw-r--r--
mod_heartmonitor.html.en
12.12
KB
-rw-r--r--
mod_heartmonitor.html.fr.utf8
12.65
KB
-rw-r--r--
mod_http2.html
209
B
-rw-r--r--
mod_http2.html.en
62.64
KB
-rw-r--r--
mod_http2.html.fr.utf8
66.38
KB
-rw-r--r--
mod_ident.html
390
B
-rw-r--r--
mod_ident.html.en
9.94
KB
-rw-r--r--
mod_ident.html.fr.utf8
10.45
KB
-rw-r--r--
mod_ident.html.ja.utf8
10.88
KB
-rw-r--r--
mod_ident.html.ko.euc-kr
9.47
KB
-rw-r--r--
mod_imagemap.html
310
B
-rw-r--r--
mod_imagemap.html.en
21.22
KB
-rw-r--r--
mod_imagemap.html.fr.utf8
23.4
KB
-rw-r--r--
mod_imagemap.html.ko.euc-kr
19.77
KB
-rw-r--r--
mod_include.html
304
B
-rw-r--r--
mod_include.html.en
59.85
KB
-rw-r--r--
mod_include.html.fr.utf8
65.42
KB
-rw-r--r--
mod_include.html.ja.utf8
55.34
KB
-rw-r--r--
mod_info.html
386
B
-rw-r--r--
mod_info.html.en
14.6
KB
-rw-r--r--
mod_info.html.fr.utf8
15.53
KB
-rw-r--r--
mod_info.html.ja.utf8
15.12
KB
-rw-r--r--
mod_info.html.ko.euc-kr
12.6
KB
-rw-r--r--
mod_isapi.html
301
B
-rw-r--r--
mod_isapi.html.en
23.44
KB
-rw-r--r--
mod_isapi.html.fr.utf8
25.48
KB
-rw-r--r--
mod_isapi.html.ko.euc-kr
21.62
KB
-rw-r--r--
mod_lbmethod_bybusyness.html
237
B
-rw-r--r--
mod_lbmethod_bybusyness.html.e...
7.85
KB
-rw-r--r--
mod_lbmethod_bybusyness.html.f...
8.25
KB
-rw-r--r--
mod_lbmethod_byrequests.html
237
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<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en"><head> <meta content="text/html; charset=UTF-8" http-equiv="Content-Type" /> <!-- XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX This file is generated from xml source: DO NOT EDIT XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX --> <title>mod_proxy_balancer - Apache HTTP Server Version 2.4</title> <link href="../style/css/manual.css" rel="stylesheet" media="all" type="text/css" title="Main stylesheet" /> <link href="../style/css/manual-loose-100pc.css" rel="alternate stylesheet" media="all" type="text/css" title="No Sidebar - Default font size" /> <link href="../style/css/manual-print.css" rel="stylesheet" media="print" type="text/css" /><link rel="stylesheet" type="text/css" href="../style/css/prettify.css" /> <script src="../style/scripts/prettify.min.js" type="text/javascript"> </script> <link href="../images/favicon.ico" rel="shortcut icon" /></head> <body> <div id="page-header"> <p class="menu"><a href="../mod/">Modules</a> | <a href="../mod/directives.html">Directives</a> | <a href="http://wiki.apache.org/httpd/FAQ">FAQ</a> | <a href="../glossary.html">Glossary</a> | <a href="../sitemap.html">Sitemap</a></p> <p class="apache">Apache HTTP Server Version 2.4</p> <img alt="" src="../images/feather.png" /></div> <div class="up"><a href="./"><img title="<-" alt="<-" src="../images/left.gif" /></a></div> <div id="path"> <a href="http://www.apache.org/">Apache</a> > <a href="http://httpd.apache.org/">HTTP Server</a> > <a href="http://httpd.apache.org/docs/">Documentation</a> > <a href="../">Version 2.4</a> > <a href="./">Modules</a></div> <div id="page-content"> <div id="preamble"><h1>Apache Module mod_proxy_balancer</h1> <div class="toplang"> <p><span>Available Languages: </span><a href="../en/mod/mod_proxy_balancer.html" title="English"> en </a> | <a href="../fr/mod/mod_proxy_balancer.html" hreflang="fr" rel="alternate" title="Français"> fr </a> | <a href="../ja/mod/mod_proxy_balancer.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a></p> </div> <table class="module"><tr><th><a href="module-dict.html#Description">Description:</a></th><td><code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code> extension for load balancing </td></tr> <tr><th><a href="module-dict.html#Status">Status:</a></th><td>Extension</td></tr> <tr><th><a href="module-dict.html#ModuleIdentifier">Module Identifier:</a></th><td>proxy_balancer_module</td></tr> <tr><th><a href="module-dict.html#SourceFile">Source File:</a></th><td>mod_proxy_balancer.c</td></tr> <tr><th><a href="module-dict.html#Compatibility">Compatibility:</a></th><td>Available in version 2.1 and later</td></tr></table> <h3>Summary</h3> <p>This module <em>requires</em> the service of <code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code> and it provides load balancing for all the supported protocols. The most important ones are:</p> <ul> <li>HTTP, using <code class="module"><a href="../mod/mod_proxy_http.html">mod_proxy_http</a></code></li> <li>FTP, using <code class="module"><a href="../mod/mod_proxy_ftp.html">mod_proxy_ftp</a></code></li> <li>AJP13, using <code class="module"><a href="../mod/mod_proxy_ajp.html">mod_proxy_ajp</a></code></li> <li>WebSocket, using <code class="module"><a href="../mod/mod_proxy_wstunnel.html">mod_proxy_wstunnel</a></code></li> </ul> <p>The Load balancing scheduler algorithm is not provided by this module but from other ones such as:</p> <ul> <li><code class="module"><a href="../mod/mod_lbmethod_byrequests.html">mod_lbmethod_byrequests</a></code></li> <li><code class="module"><a href="../mod/mod_lbmethod_bytraffic.html">mod_lbmethod_bytraffic</a></code></li> <li><code class="module"><a href="../mod/mod_lbmethod_bybusyness.html">mod_lbmethod_bybusyness</a></code></li> <li><code class="module"><a href="../mod/mod_lbmethod_heartbeat.html">mod_lbmethod_heartbeat</a></code></li> </ul> <p>Thus, in order to get the ability of load balancing, <code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code>, <code class="module"><a href="../mod/mod_proxy_balancer.html">mod_proxy_balancer</a></code> and at least one of load balancing scheduler algorithm modules have to be present in the server.</p> <div class="warning"><h3>Warning</h3> <p>Do not enable proxying until you have <a href="mod_proxy.html#access">secured your server</a>. Open proxy servers are dangerous both to your network and to the Internet at large.</p> </div> </div> <div id="quickview"><a href="https://www.apache.org/foundation/contributing.html" class="badge"><img src="https://www.apache.org/images/SupportApache-small.png" alt="Support Apache!" /></a><h3>Topics</h3> <ul id="topics"> <li><img alt="" src="../images/down.gif" /> <a href="#scheduler">Load balancer scheduler algorithm</a></li> <li><img alt="" src="../images/down.gif" /> <a href="#stickyness">Load balancer stickyness</a></li> <li><img alt="" src="../images/down.gif" /> <a href="#example">Examples of a balancer configuration</a></li> <li><img alt="" src="../images/down.gif" /> <a href="#environment">Exported Environment Variables</a></li> <li><img alt="" src="../images/down.gif" /> <a href="#balancer_manager">Enabling Balancer Manager Support</a></li> <li><img alt="" src="../images/down.gif" /> <a href="#stickyness_implementation">Details on load balancer stickyness</a></li> <li><img alt="" src="../images/down.gif" /> <a href="#stickyness_troubleshooting">Troubleshooting load balancer stickyness</a></li> </ul><h3 class="directives">Directives</h3> <p>This module provides no directives.</p> <h3>Bugfix checklist</h3><ul class="seealso"><li><a href="https://www.apache.org/dist/httpd/CHANGES_2.4">httpd changelog</a></li><li><a href="https://bz.apache.org/bugzilla/buglist.cgi?bug_status=__open__&list_id=144532&product=Apache%20httpd-2&query_format=specific&order=changeddate%20DESC%2Cpriority%2Cbug_severity&component=mod_proxy_balancer">Known issues</a></li><li><a href="https://bz.apache.org/bugzilla/enter_bug.cgi?product=Apache%20httpd-2&component=mod_proxy_balancer">Report a bug</a></li></ul><h3>See also</h3> <ul class="seealso"> <li><code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code></li> <li><code class="directive"><a href="../mod/mod_proxy.html#balancermember">BalancerMember</a></code></li> <li><code class="directive"><a href="../mod/mod_proxy.html#balancergrowth">BalancerGrowth</a></code></li> <li><code class="directive"><a href="../mod/mod_proxy.html#balancerpersist">BalancerPersist</a></code></li> <li><code class="directive"><a href="../mod/mod_proxy.html#balancerinherit">BalancerInherit</a></code></li> <li><a href="#comments_section">Comments</a></li></ul></div> <div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> <div class="section"> <h2><a name="scheduler" id="scheduler">Load balancer scheduler algorithm</a></h2> <p>At present, there are 4 load balancer scheduler algorithms available for use: Request Counting (<code class="module"><a href="../mod/mod_lbmethod_byrequests.html">mod_lbmethod_byrequests</a></code>), Weighted Traffic Counting (<code class="module"><a href="../mod/mod_lbmethod_bytraffic.html">mod_lbmethod_bytraffic</a></code>), Pending Request Counting (<code class="module"><a href="../mod/mod_lbmethod_bybusyness.html">mod_lbmethod_bybusyness</a></code>) and Heartbeat Traffic Counting (<code class="module"><a href="../mod/mod_lbmethod_heartbeat.html">mod_lbmethod_heartbeat</a></code>). These are controlled via the <code>lbmethod</code> value of the Balancer definition. See the <code class="directive"><a href="../mod/mod_proxy.html#proxypass">ProxyPass</a></code> directive for more information, especially regarding how to configure the Balancer and BalancerMembers.</p> </div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> <div class="section"> <h2><a name="stickyness" id="stickyness">Load balancer stickyness</a></h2> <p>The balancer supports stickyness. When a request is proxied to some back-end, then all following requests from the same user should be proxied to the same back-end. Many load balancers implement this feature via a table that maps client IP addresses to back-ends. This approach is transparent to clients and back-ends, but suffers from some problems: unequal load distribution if clients are themselves hidden behind proxies, stickyness errors when a client uses a dynamic IP address that changes during a session and loss of stickyness, if the mapping table overflows.</p> <p>The module <code class="module"><a href="../mod/mod_proxy_balancer.html">mod_proxy_balancer</a></code> implements stickyness on top of two alternative means: cookies and URL encoding. Providing the cookie can be either done by the back-end or by the Apache web server itself. The URL encoding is usually done on the back-end.</p> </div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> <div class="section"> <h2><a name="example" id="example">Examples of a balancer configuration</a></h2> <p>Before we dive into the technical details, here's an example of how you might use <code class="module"><a href="../mod/mod_proxy_balancer.html">mod_proxy_balancer</a></code> to provide load balancing between two back-end servers: </p> <pre class="prettyprint lang-config"><Proxy "balancer://mycluster"> BalancerMember "http://192.168.1.50:80" BalancerMember "http://192.168.1.51:80" </Proxy> ProxyPass "/test" "balancer://mycluster" ProxyPassReverse "/test" "balancer://mycluster"</pre> <p>Another example of how to provide load balancing with stickyness using <code class="module"><a href="../mod/mod_headers.html">mod_headers</a></code>, even if the back-end server does not set a suitable session cookie: </p> <pre class="prettyprint lang-config">Header add Set-Cookie "ROUTEID=.%{BALANCER_WORKER_ROUTE}e; path=/" env=BALANCER_ROUTE_CHANGED <Proxy "balancer://mycluster"> BalancerMember "http://192.168.1.50:80" route=1 BalancerMember "http://192.168.1.51:80" route=2 ProxySet stickysession=ROUTEID </Proxy> ProxyPass "/test" "balancer://mycluster" ProxyPassReverse "/test" "balancer://mycluster"</pre> </div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> <div class="section"> <h2><a name="environment" id="environment">Exported Environment Variables</a></h2> <p>At present there are 6 environment variables exported:</p> <dl> <dt><var><a name="balancer_session_sticky" id="balancer_session_sticky">BALANCER_SESSION_STICKY</a></var></dt> <dd> <p>This is assigned the <var>stickysession</var> value used for the current request. It is the name of the cookie or request parameter used for sticky sessions</p> </dd> <dt><var><a name="balancer_session_route" id="balancer_session_route">BALANCER_SESSION_ROUTE</a></var></dt> <dd> <p>This is assigned the <var>route</var> parsed from the current request.</p> </dd> <dt><var><a name="balancer_name" id="balancer_name">BALANCER_NAME</a></var></dt> <dd> <p>This is assigned the name of the balancer used for the current request. The value is something like <code>balancer://foo</code>.</p> </dd> <dt><var><a name="balancer_worker_name" id="balancer_worker_name">BALANCER_WORKER_NAME</a></var></dt> <dd> <p>This is assigned the name of the worker used for the current request. The value is something like <code>http://hostA:1234</code>.</p> </dd> <dt><var><a name="balancer_worker_route" id="balancer_worker_route">BALANCER_WORKER_ROUTE</a></var></dt> <dd> <p>This is assigned the <var>route</var> of the worker that will be used for the current request.</p> </dd> <dt><var><a name="balancer_route_changed" id="balancer_route_changed">BALANCER_ROUTE_CHANGED</a></var></dt> <dd> <p>This is set to 1 if the session route does not match the worker route (BALANCER_SESSION_ROUTE != BALANCER_WORKER_ROUTE) or the session does not yet have an established route. This can be used to determine when/if the client needs to be sent an updated route when sticky sessions are used.</p> </dd> </dl> </div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> <div class="section"> <h2><a name="balancer_manager" id="balancer_manager">Enabling Balancer Manager Support</a></h2> <p>This module <em>requires</em> the service of <code class="module"><a href="../mod/mod_status.html">mod_status</a></code>. Balancer manager enables dynamic update of balancer members. You can use balancer manager to change the balance factor of a particular member, or put it in the off line mode. </p> <p>Thus, in order to get the ability of load balancer management, <code class="module"><a href="../mod/mod_status.html">mod_status</a></code> and <code class="module"><a href="../mod/mod_proxy_balancer.html">mod_proxy_balancer</a></code> have to be present in the server.</p> <p>To enable load balancer management for browsers from the example.com domain add this code to your <code>httpd.conf</code> configuration file</p> <pre class="prettyprint lang-config"><Location "/balancer-manager"> SetHandler balancer-manager Require host example.com </Location></pre> <p>You can now access load balancer manager by using a Web browser to access the page <code>http://your.server.name/balancer-manager</code>. Please note that only Balancers defined outside of <code><Location ...></code> containers can be dynamically controlled by the Manager.</p> </div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> <div class="section"> <h2><a name="stickyness_implementation" id="stickyness_implementation">Details on load balancer stickyness</a></h2> <p>When using cookie based stickyness, you need to configure the name of the cookie that contains the information about which back-end to use. This is done via the <var>stickysession</var> attribute added to either <code class="directive"><a href="../mod/mod_proxy.html#proxypass">ProxyPass</a></code> or <code class="directive"><a href="../mod/mod_proxy.html#proxyset">ProxySet</a></code>. The name of the cookie is case-sensitive. The balancer extracts the value of the cookie and looks for a member worker with <var>route</var> equal to that value. The <var>route</var> must also be set in either <code class="directive"><a href="../mod/mod_proxy.html#proxypass">ProxyPass</a></code> or <code class="directive"><a href="../mod/mod_proxy.html#proxyset">ProxySet</a></code>. The cookie can either be set by the back-end, or as shown in the above <a href="#example">example</a> by the Apache web server itself.</p> <p>Some back-ends use a slightly different form of stickyness cookie, for instance Apache Tomcat. Tomcat adds the name of the Tomcat instance to the end of its session id cookie, separated with a dot (<code>.</code>) from the session id. Thus if the Apache web server finds a dot in the value of the stickyness cookie, it only uses the part behind the dot to search for the route. In order to let Tomcat know about its instance name, you need to set the attribute <code>jvmRoute</code> inside the Tomcat configuration file <code>conf/server.xml</code> to the value of the <var>route</var> of the worker that connects to the respective Tomcat. The name of the session cookie used by Tomcat (and more generally by Java web applications based on servlets) is <code>JSESSIONID</code> (upper case) but can be configured to something else.</p> <p>The second way of implementing stickyness is URL encoding. The web server searches for a query parameter in the URL of the request. The name of the parameter is specified again using <var>stickysession</var>. The value of the parameter is used to lookup a member worker with <var>route</var> equal to that value. Since it is not easy to extract and manipulate all URL links contained in responses, generally the work of adding the parameters to each link is done by the back-end generating the content. In some cases it might be feasible doing this via the web server using <code class="module"><a href="../mod/mod_substitute.html">mod_substitute</a></code> or <code class="module"><a href="../mod/mod_sed.html">mod_sed</a></code>. This can have negative impact on performance though.</p> <p>The Java standards implement URL encoding slightly different. They use a path info appended to the URL using a semicolon (<code>;</code>) as the separator and add the session id behind. As in the cookie case, Apache Tomcat can include the configured <code>jvmRoute</code> in this path info. To let Apache find this sort of path info, you need to set <code>scolonpathdelim</code> to <code>On</code> in <code class="directive"><a href="../mod/mod_proxy.html#proxypass">ProxyPass</a></code> or <code class="directive"><a href="../mod/mod_proxy.html#proxyset">ProxySet</a></code>.</p> <p>Finally you can support cookies and URL encoding at the same time, by configuring the name of the cookie and the name of the URL parameter separated by a vertical bar (<code>|</code>) as in the following example:</p> <pre class="prettyprint lang-config">ProxyPass "/test" "balancer://mycluster" stickysession=JSESSIONID|jsessionid scolonpathdelim=On <Proxy "balancer://mycluster"> BalancerMember "http://192.168.1.50:80" route=node1 BalancerMember "http://192.168.1.51:80" route=node2 </Proxy></pre> <p>If the cookie and the request parameter both provide routing information for the same request, the information from the request parameter is used.</p> </div><div class="top"><a href="#page-header"><img alt="top" src="../images/up.gif" /></a></div> <div class="section"> <h2><a name="stickyness_troubleshooting" id="stickyness_troubleshooting">Troubleshooting load balancer stickyness</a></h2> <p>If you experience stickyness errors, e.g. users lose their application sessions and need to login again, you first want to check whether this is because the back-ends are sometimes unavailable or whether your configuration is wrong. To find out about possible stability problems with the back-ends, check your Apache error log for proxy error messages.</p> <p>To verify your configuration, first check, whether the stickyness is based on a cookie or on URL encoding. Next step would be logging the appropriate data in the access log by using an enhanced <code class="directive"><a href="../mod/mod_log_config.html#logformat">LogFormat</a></code>. The following fields are useful:</p> <dl> <dt><code>%{MYCOOKIE}C</code></dt> <dd>The value contained in the cookie with name <code>MYCOOKIE</code>. The name should be the same given in the <var>stickysession</var> attribute.</dd> <dt><code>%{Set-Cookie}o</code></dt> <dd>This logs any cookie set by the back-end. You can track, whether the back-end sets the session cookie you expect, and to which value it is set.</dd> <dt><code>%{BALANCER_SESSION_STICKY}e</code></dt> <dd>The name of the cookie or request parameter used to lookup the routing information.</dd> <dt><code>%{BALANCER_SESSION_ROUTE}e</code></dt> <dd>The route information found in the request.</dd> <dt><code>%{BALANCER_WORKER_ROUTE}e</code></dt> <dd>The route of the worker chosen.</dd> <dt><code>%{BALANCER_ROUTE_CHANGED}e</code></dt> <dd>Set to <code>1</code> if the route in the request is different from the route of the worker, i.e. the request couldn't be handled sticky.</dd> </dl> <p>Common reasons for loss of session are session timeouts, which are usually configurable on the back-end server.</p> <p>The balancer also logs detailed information about handling stickyness to the error log, if the log level is set to <code>debug</code> or higher. This is an easy way to troubleshoot stickyness problems, but the log volume might be too high for production servers under high load.</p> </div> </div> <div class="bottomlang"> <p><span>Available Languages: </span><a href="../en/mod/mod_proxy_balancer.html" title="English"> en </a> | <a href="../fr/mod/mod_proxy_balancer.html" hreflang="fr" rel="alternate" title="Français"> fr </a> | <a href="../ja/mod/mod_proxy_balancer.html" hreflang="ja" rel="alternate" title="Japanese"> ja </a></p> </div><div class="top"><a href="#page-header"><img src="../images/up.gif" alt="top" /></a></div><div class="section"><h2><a id="comments_section" name="comments_section">Comments</a></h2><div class="warning"><strong>Notice:</strong><br />This is not a Q&A section. Comments placed here should be pointed towards suggestions on improving the documentation or server, and may be removed by our moderators if they are either implemented or considered invalid/off-topic. 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