Mercurial > hg > nginx-site
annotate xml/en/docs/http/ngx_http_upstream_module.xml @ 968:fa19bacf6e1e
Unified upstream server up/down state terminology.
The "down" word is reserved for usage with the flag of the same name, that
marks server as permanently unavailable.
author | Vladimir Homutov <vl@nginx.com> |
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date | Thu, 15 Aug 2013 15:54:23 +0400 |
parents | 95c3c3bbf1ce |
children | 7c542520b8f7 |
rev | line source |
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1 <?xml version="1.0"?> |
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2 |
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3 <!-- |
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4 Copyright (C) Igor Sysoev |
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5 Copyright (C) Nginx, Inc. |
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6 --> |
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7 |
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8 <!DOCTYPE module SYSTEM "../../../../dtd/module.dtd"> |
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9 |
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10 <module name="Module ngx_http_upstream_module" |
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11 link="/en/docs/http/ngx_http_upstream_module.html" |
589 | 12 lang="en" |
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13 rev="8"> |
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14 |
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15 <section id="summary"> |
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16 |
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17 <para> |
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18 The <literal>ngx_http_upstream_module</literal> module |
966 | 19 is used to define groups of servers that can be referenced |
20 by the <link doc="ngx_http_proxy_module.xml" id="proxy_pass"/>, | |
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21 <link doc="ngx_http_fastcgi_module.xml" id="fastcgi_pass"/>, and |
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22 <link doc="ngx_http_memcached_module.xml" id="memcached_pass"/> directives. |
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23 </para> |
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24 |
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25 </section> |
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26 |
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27 |
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28 <section id="example" name="Example Configuration"> |
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29 |
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30 <para> |
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31 <example> |
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32 upstream <emphasis>backend</emphasis> { |
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33 server backend1.example.com weight=5; |
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34 server backend2.example.com:8080; |
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35 server unix:/tmp/backend3; |
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36 |
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37 server backup1.example.com:8080 backup; |
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38 server backup2.example.com:8080 backup; |
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39 } |
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40 |
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41 server { |
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42 location / { |
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43 proxy_pass http://<emphasis>backend</emphasis>; |
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44 } |
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45 } |
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46 </example> |
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47 </para> |
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48 |
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49 <para> |
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50 Dynamically configurable group, |
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51 available as part of our <commercial_version/> only: |
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52 <example> |
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53 upstream <emphasis>appservers</emphasis> { |
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54 zone appservers 64k; |
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55 |
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56 server appserv1.example.com weight=5; |
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57 server appserv2.example.com:8080 fail_timeout=5s slow_start=30s; |
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58 server 192.0.2.1 max_fails=3; |
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59 |
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60 server reserve1.example.com:8080 backup; |
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61 server reserve2.example.com:8080 backup; |
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62 } |
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63 |
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64 server { |
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65 location / { |
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66 proxy_pass http://<emphasis>appservers</emphasis>; |
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67 health_check; |
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68 } |
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69 |
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70 location /upstream_conf { |
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71 upstream_conf; |
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72 allow 127.0.0.1; |
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73 deny all; |
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74 } |
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75 } |
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76 </example> |
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77 </para> |
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78 |
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79 </section> |
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80 |
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81 |
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82 <section id="directives" name="Directives"> |
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83 |
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84 <directive name="upstream"> |
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85 <syntax block="yes"><value>name</value></syntax> |
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86 <default/> |
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87 <context>http</context> |
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88 |
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89 <para> |
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90 Defines a group of servers. |
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91 Servers can listen on different ports. |
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92 In addition, servers listening on TCP and UNIX-domain sockets |
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93 can be mixed. |
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94 </para> |
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95 |
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96 <para> |
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97 Example: |
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98 <example> |
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99 upstream backend { |
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100 server backend1.example.com weight=5; |
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101 server 127.0.0.1:8080 max_fails=3 fail_timeout=30s; |
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102 server unix:/tmp/backend3; |
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103 } |
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104 </example> |
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105 </para> |
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106 |
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107 <para> |
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109 weighted round-robin balancing method. |
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110 In the above example, each 7 requests will be distributed as follows: |
966 | 111 5 requests go to <literal>backend1.example.com</literal> |
112 and one request to each of the second and third servers. | |
113 If an error occurs during communication with a server, the request will | |
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114 be passed to the next server, and so on until all of the functioning |
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115 servers will be tried. |
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116 If a successful response could not be obtained from any of the servers, |
966 | 117 the client will receive the result of the communication with the last server. |
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118 </para> |
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119 |
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120 </directive> |
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121 |
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122 |
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123 <directive name="server"> |
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124 <syntax><value>address</value> [<value>parameters</value>]</syntax> |
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125 <default/> |
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126 <context>upstream</context> |
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127 |
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128 <para> |
966 | 129 Defines the <value>address</value> and other <value>parameters</value> |
130 of a server. | |
131 The address can be specified as a domain name or IP address, | |
132 with an optional port, or as a UNIX-domain socket path | |
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133 specified after the “<literal>unix:</literal>” prefix. |
966 | 134 If a port is not specified, the port 80 is used. |
135 A domain name that resolves to several IP addresses defines | |
136 multiple servers at once. | |
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137 </para> |
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138 |
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139 <para> |
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140 The following parameters can be defined: |
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141 <list type="tag"> |
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142 |
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143 <tag-name><literal>weight</literal>=<value>number</value></tag-name> |
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144 <tag-desc> |
966 | 145 sets the weight of the server, by default, 1. |
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146 </tag-desc> |
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147 |
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148 <tag-name><literal>max_fails</literal>=<value>number</value></tag-name> |
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149 <tag-desc> |
966 | 150 sets the number of unsuccessful attempts to communicate with the server |
151 that should happen in the duration set by the <literal>fail_timeout</literal> | |
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152 parameter to consider the server unavailable for a duration also set by the |
966 | 153 <literal>fail_timeout</literal> parameter. |
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154 By default, the number of unsuccessful attempts is set to 1. |
966 | 155 The zero value disables the accounting of attempts. |
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156 What is considered an unsuccessful attempt is defined by the |
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157 <link doc="ngx_http_proxy_module.xml" id="proxy_next_upstream"/>, |
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158 <link doc="ngx_http_fastcgi_module.xml" id="fastcgi_next_upstream"/>, and |
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159 <link doc="ngx_http_memcached_module.xml" id="memcached_next_upstream"/> |
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160 directives. |
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161 </tag-desc> |
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162 |
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163 <tag-name><literal>fail_timeout</literal>=<value>time</value></tag-name> |
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164 <tag-desc> |
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165 sets |
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166 <list type="bullet"> |
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167 |
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168 <listitem> |
966 | 169 the time during which the specified number of unsuccessful attempts to |
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170 communicate with the server should happen to consider the server unavailable; |
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171 </listitem> |
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172 |
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173 <listitem> |
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174 and the period of time the server will be considered unavailable. |
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175 </listitem> |
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176 |
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177 </list> |
966 | 178 By default, the parameter is set to 10 seconds. |
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179 </tag-desc> |
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180 |
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181 <tag-name><literal>slow_start</literal>=<value>time</value></tag-name> |
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182 <tag-desc> |
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183 sets the <value>time</value> during which the server will recover its weight |
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184 from zero to a nominal value, when unhealthy server becomes |
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185 <link id="health_check">healthy</link>, |
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186 or when the server becomes available after a period of time |
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187 it was considered unavailable. |
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188 Default value is zero, i.e. slow start is disabled. |
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189 <note> |
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190 This functionality is available as part of our <commercial_version/> only. |
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191 </note> |
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192 </tag-desc> |
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193 |
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194 <tag-name><literal>backup</literal></tag-name> |
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195 <tag-desc> |
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196 marks the server as a backup server. |
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197 It will be passed requests when the primary servers are unavailable. |
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198 </tag-desc> |
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199 |
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200 <tag-name><literal>down</literal></tag-name> |
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201 <tag-desc> |
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202 marks the server as permanently unavailable; used along with |
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203 the <link id="ip_hash"/> directive. |
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204 </tag-desc> |
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205 |
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206 </list> |
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207 </para> |
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208 |
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209 <para> |
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210 Example: |
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211 <example> |
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212 upstream backend { |
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213 server backend1.example.com weight=5; |
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214 server 127.0.0.1:8080 max_fails=3 fail_timeout=30s; |
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215 server unix:/tmp/backend3; |
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216 |
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217 server backup1.example.com:8080 backup; |
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218 } |
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219 </example> |
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220 </para> |
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221 |
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222 </directive> |
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223 |
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224 |
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225 <directive name="zone"> |
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226 <syntax><value>name</value> <value>size</value></syntax> |
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227 <default/> |
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228 <context>upstream</context> |
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229 |
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230 <para> |
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231 Makes the group dynamically configurable. |
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232 Defines the <value>name</value> and <value>size</value> of a shared |
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233 memory zone that keeps group’s configuration and run-time state that are |
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234 shared between worker processes. |
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235 Such groups allow to add, remove, and modify servers at run time. |
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236 The configuration is accessible via a special location handled by |
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237 <link id="upstream_conf"/>. |
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238 </para> |
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239 |
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240 <para> |
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241 <note> |
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242 This directive is available as part of our <commercial_version/> only. |
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243 </note> |
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244 </para> |
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245 |
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246 </directive> |
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247 |
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248 |
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249 <directive name="ip_hash"> |
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250 <syntax/> |
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251 <default/> |
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252 <context>upstream</context> |
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253 |
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254 <para> |
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255 Specifies that a group should use a load balancing method where requests |
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256 are distributed between servers based on client IP addresses. |
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257 The first three octets of the client IPv4 address, or the entire IPv6 address, |
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258 are used as a hashing key. |
966 | 259 The method ensures that requests from the same client will always be |
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260 passed to the same server except when this server is unavailable. |
966 | 261 In the latter case client requests will be passed to another server. |
262 Most probably, it will always be the same server as well. | |
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263 <note> |
566 | 264 IPv6 addresses are supported starting from versions 1.3.2 and 1.2.2. |
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265 </note> |
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266 </para> |
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267 |
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268 <para> |
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269 If one of the servers needs to be temporarily removed, it should |
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270 be marked with the <literal>down</literal> parameter in |
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271 order to preserve the current hashing of client IP addresses. |
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272 </para> |
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273 |
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274 <para> |
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275 Example: |
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276 <example> |
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277 upstream backend { |
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278 ip_hash; |
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279 |
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280 server backend1.example.com; |
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281 server backend2.example.com; |
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282 server backend3.example.com <emphasis>down</emphasis>; |
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283 server backend4.example.com; |
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284 } |
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285 </example> |
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286 </para> |
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287 |
526
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288 <para> |
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289 <note> |
966 | 290 Until versions 1.3.1 and 1.2.2, it was not possible to specify a weight for |
533
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291 servers using the <literal>ip_hash</literal> load balancing method. |
526
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292 </note> |
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293 </para> |
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294 |
293
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295 </directive> |
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296 |
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297 |
316
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298 <directive name="keepalive"> |
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299 <syntax><value>connections</value></syntax> |
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300 <default/> |
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301 <context>upstream</context> |
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302 <appeared-in>1.1.4</appeared-in> |
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303 |
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304 <para> |
966 | 305 Activates the cache for connections to upstream servers. |
316
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306 </para> |
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307 |
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308 <para> |
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309 The <value>connections</value> parameter sets the maximum number of |
966 | 310 idle keepalive connections to upstream servers that are preserved in |
311 the cache of each worker process. | |
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312 When this number is exceeded, the least recently used connections |
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313 are closed. |
316
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314 <note> |
966 | 315 It should be particularly noted that the <literal>keepalive</literal> directive |
316 does not limit the total number of connections to upstream servers | |
317 that an nginx worker process can open. | |
318 The <value>connections</value> parameter should be set to a number small enough | |
319 to let upstream servers process new incoming connections as well. | |
316
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320 </note> |
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321 </para> |
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322 |
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323 <para> |
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324 Example configuration of memcached upstream with keepalive connections: |
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325 <example> |
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326 upstream memcached_backend { |
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327 server 127.0.0.1:11211; |
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328 server 10.0.0.2:11211; |
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329 |
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330 keepalive 32; |
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331 } |
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332 |
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333 server { |
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334 ... |
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335 |
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336 location /memcached/ { |
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337 set $memcached_key $uri; |
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338 memcached_pass memcached_backend; |
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339 } |
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340 |
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341 } |
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342 </example> |
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343 </para> |
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344 |
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345 <para> |
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346 For HTTP, the <link doc="ngx_http_proxy_module.xml" id="proxy_http_version"/> |
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347 directive should be set to “<literal>1.1</literal>” |
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348 and the <header>Connection</header> header field should be cleared: |
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349 <example> |
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350 upstream http_backend { |
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351 server 127.0.0.1:8080; |
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352 |
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353 keepalive 16; |
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354 } |
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355 |
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356 server { |
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357 ... |
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358 |
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359 location /http/ { |
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360 proxy_pass http://http_backend; |
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361 proxy_http_version 1.1; |
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362 proxy_set_header Connection ""; |
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363 ... |
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364 } |
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365 } |
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366 </example> |
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367 </para> |
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368 |
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369 <para> |
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370 <note> |
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371 Alternatively, HTTP/1.0 persistent connections can be used by passing the |
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372 <header>Connection: Keep-Alive</header> header field to an upstream server, |
966 | 373 though this method is not recommended. |
316
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374 </note> |
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375 </para> |
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376 |
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377 <para> |
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378 For FastCGI servers, it is required to set |
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379 <link doc="ngx_http_fastcgi_module.xml" id="fastcgi_keep_conn"/> |
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380 for keepalive connections to work: |
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381 <example> |
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382 upstream fastcgi_backend { |
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383 server 127.0.0.1:9000; |
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384 |
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385 keepalive 8; |
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386 } |
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387 |
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388 server { |
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389 ... |
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390 |
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391 location /fastcgi/ { |
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392 fastcgi_pass fastcgi_backend; |
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393 fastcgi_keep_conn on; |
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394 ... |
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395 } |
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396 } |
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397 </example> |
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398 </para> |
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399 |
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400 <para> |
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401 <note> |
533
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402 When using load balancer methods other than the default |
966 | 403 round-robin method, it is necessary to activate them before |
316
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404 the <literal>keepalive</literal> directive. |
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405 </note> |
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406 |
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407 <note> |
533
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408 SCGI and uwsgi protocols do not have a notion of keepalive connections. |
316
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409 </note> |
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410 </para> |
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411 |
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412 </directive> |
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413 |
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414 |
526
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415 <directive name="least_conn"> |
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416 <syntax/> |
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417 <default/> |
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418 <context>upstream</context> |
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419 <appeared-in>1.3.1</appeared-in> |
566 | 420 <appeared-in>1.2.2</appeared-in> |
526
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421 |
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422 <para> |
533
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423 Specifies that a group should use a load balancing method where a request |
526
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424 is passed to the server with the least number of active connections, |
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425 taking into account weights of servers. |
533
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426 If there are several such servers, they are tried using a |
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427 weighted round-robin balancing method. |
293
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428 </para> |
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429 |
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430 </directive> |
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431 |
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432 |
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433 <directive name="health_check"> |
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434 <syntax> |
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435 [<literal>interval=</literal><value>time</value>] |
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436 <!-- |
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437 [<literal>jitter=</literal><value>time</value>] |
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438 --> |
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439 [<literal>fails=</literal><value>number</value>] |
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440 [<literal>passes=</literal><value>number</value>] |
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441 [<literal>uri=</literal><value>uri</value>] |
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442 [<literal>match=</literal><value>name</value>]</syntax> |
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443 |
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444 <default/> |
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445 <context>location</context> |
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446 |
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447 <para> |
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448 Enables periodic health checks of the servers in a |
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449 <link id="upstream">group</link> referenced in the surrounding location. |
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450 </para> |
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451 |
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452 <para> |
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453 The following optional parameters are supported: |
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454 <list type="bullet"> |
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|
455 |
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456 <listitem> |
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457 <literal>interval</literal> |
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458 sets the interval between two consecutive health checks, |
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459 by default, 5 seconds; |
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460 </listitem> |
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461 |
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462 <listitem> |
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463 <literal>fails</literal> |
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464 sets the number of consecutive failed health checks of a particular server |
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465 after which this server will be considered unhealthy, |
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466 by default, 1; |
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467 </listitem> |
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468 |
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469 <listitem> |
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470 <literal>passes</literal> |
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471 sets the number of consecutive passed health checks of a particular server |
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472 after which the server will be considered healthy, |
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473 by default, 1; |
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474 </listitem> |
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475 |
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476 <listitem> |
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477 <literal>uri</literal> |
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478 defines the URI used in health check requests, |
956
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479 by default, “<literal>/</literal>”; |
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480 </listitem> |
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481 |
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482 <listitem> |
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483 <literal>match</literal> |
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484 specifies the <literal>match</literal> block configuring the tests that a |
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485 response should pass in order for a health check to pass; |
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486 by default, the response should have status code 2xx or 3xx. |
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487 </listitem> |
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488 |
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489 </list> |
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490 </para> |
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|
491 |
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492 <para> |
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493 For example, |
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494 <example> |
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495 location / { |
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496 proxy_pass http://backend; |
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497 health_check; |
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498 } |
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499 </example> |
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500 will send “<literal>/</literal>” requests to each |
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501 server in the <literal>backend</literal> group every five seconds. |
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502 If any communication error or timeout occurs, or a |
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503 proxied server responds with the status code other than |
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504 2xx or 3xx, the health check will fail, and the server will |
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505 be considered unhealthy. |
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506 Client requests are not passed to unhealthy servers. |
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507 </para> |
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508 |
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509 <para> |
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510 Health checks can be configured to test the status code of a response, |
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511 presence of certain header fields and their values, |
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512 and the body contents. |
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513 Tests are configured separately using the <link id="match"/> directive |
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514 and referenced in the <literal>match</literal> parameter. |
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515 For example: |
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516 <example> |
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517 http { |
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518 server { |
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519 ... |
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520 location / { |
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521 proxy_pass http://backend; |
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522 health_check match=welcome; |
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523 } |
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524 } |
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|
525 |
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526 match welcome { |
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527 status 200; |
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528 header Content-Type = text/html; |
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529 body ~ "Welcome to nginx!"; |
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530 } |
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|
531 } |
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|
532 </example> |
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533 This configuration tells that for a health check to pass, the response to a |
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534 health check request should succeed, |
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535 have status 200, content type “<literal>text/html</literal>”, |
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536 and contain “<literal>Welcome to nginx!</literal>” in the body. |
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537 </para> |
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|
538 |
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|
539 <para> |
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540 The server group must reside in the <link id="zone">shared memory</link>. |
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|
541 </para> |
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542 |
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|
543 <para> |
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|
544 If several health checks are defined for the same group of servers, |
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545 a single failure of any check will make the corresponding server be |
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546 considered unhealthy. |
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547 </para> |
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548 |
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|
549 <para> |
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|
550 <note> |
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|
551 This directive is available as part of our <commercial_version/> only. |
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552 </note> |
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553 </para> |
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554 |
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|
555 </directive> |
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556 |
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|
557 |
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|
558 <directive name="match"> |
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559 <syntax block="yes"><value>name</value></syntax> |
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560 <default/> |
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561 <context>http</context> |
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562 |
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|
563 <para> |
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564 Defines the named test set used to verify responses to health check requests. |
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|
565 </para> |
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|
566 |
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|
567 <para> |
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568 The following items can be tested in a response: |
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|
569 <list type="tag"> |
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|
570 |
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|
571 <tag-name><literal>status 200;</literal></tag-name> |
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572 <tag-desc>status is 200</tag-desc> |
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573 |
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574 <tag-name><literal>status ! 500;</literal></tag-name> |
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575 <tag-desc>status is not 500</tag-desc> |
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|
576 |
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577 <tag-name><literal>status 200 204;</literal></tag-name> |
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578 <tag-desc>status is 200 or 204</tag-desc> |
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|
579 |
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580 <tag-name><literal>status ! 301 302;</literal></tag-name> |
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581 <tag-desc>status is neither 301 nor 302</tag-desc> |
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|
582 |
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583 <tag-name><literal>status 200-399;</literal></tag-name> |
966 | 584 <tag-desc>status is in the range from 200 to 399</tag-desc> |
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|
585 |
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|
586 <tag-name><literal>status ! 400-599;</literal></tag-name> |
966 | 587 <tag-desc>status is not in the range from 400 to 599</tag-desc> |
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|
588 |
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|
589 <tag-name><literal>status 301-303 307;</literal></tag-name> |
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590 <tag-desc>status is either 301, 302, 303, or 307</tag-desc> |
953
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|
591 |
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|
592 </list> |
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|
593 |
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|
594 <list type="tag"> |
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|
595 |
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|
596 <tag-name><literal>header Content-Type = text/html;</literal></tag-name> |
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|
597 <tag-desc> |
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598 header contains <header>Content-Type</header> |
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599 with value <literal>text/html</literal> |
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|
600 </tag-desc> |
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|
601 |
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|
602 <tag-name><literal>header Content-Type != text/html;</literal></tag-name> |
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|
603 <tag-desc> |
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|
604 header contains <header>Content-Type</header> |
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|
605 with value other than <literal>text/html</literal> |
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|
606 </tag-desc> |
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|
607 |
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changeset
|
608 <tag-name><literal>header Connection ~ close;</literal></tag-name> |
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|
609 <tag-desc> |
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changeset
|
610 header contains <header>Connection</header> |
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|
611 with value matching regular expression <literal>close</literal> |
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|
612 </tag-desc> |
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changeset
|
613 |
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changeset
|
614 <tag-name><literal>header Connection !~ close;</literal></tag-name> |
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changeset
|
615 <tag-desc> |
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|
616 header contains <header>Connection</header> |
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|
617 with value not matching regular expression <literal>close</literal> |
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|
618 </tag-desc> |
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|
619 |
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|
620 <tag-name><literal>header Host;</literal></tag-name> |
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|
621 <tag-desc>header contains <header>Host</header></tag-desc> |
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|
622 |
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|
623 <tag-name><literal>header ! X-Accel-Redirect;</literal></tag-name> |
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624 <tag-desc>header lacks <header>X-Accel-Redirect</header></tag-desc> |
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|
625 |
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|
626 </list> |
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|
627 |
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|
628 <list type="tag"> |
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|
629 |
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|
630 <tag-name><literal>body ~ "Welcome to nginx!";</literal></tag-name> |
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|
631 <tag-desc> |
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|
632 body matches regular expression “<literal>Welcome to nginx!</literal>” |
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|
633 </tag-desc> |
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changeset
|
634 |
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changeset
|
635 <tag-name><literal>body !~ "Welcome to nginx!";</literal></tag-name> |
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|
636 <tag-desc> |
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|
637 body does not match regular expression “<literal>Welcome to nginx!</literal>” |
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|
638 </tag-desc> |
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diff
changeset
|
639 |
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|
640 </list> |
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|
641 </para> |
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changeset
|
642 |
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changeset
|
643 <para> |
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|
644 If several tests are specified, |
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|
645 the response matches only if it matches all tests. |
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|
646 <note> |
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|
647 Only the first 256k of the response body are examined. |
953
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|
648 </note> |
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|
649 </para> |
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changeset
|
650 |
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|
651 <para> |
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changeset
|
652 Examples: |
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Commercial version documentation.
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|
653 <example> |
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changeset
|
654 # status is 200, content type is "text/html", |
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changeset
|
655 # and body contains "Welcome to nginx!" |
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Ruslan Ermilov <ru@nginx.com>
parents:
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|
656 match welcome { |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
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diff
changeset
|
657 status 200; |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
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diff
changeset
|
658 header Content-Type = text/html; |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
659 body ~ "Welcome to nginx!"; |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
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diff
changeset
|
660 } |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
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diff
changeset
|
661 </example> |
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Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
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diff
changeset
|
662 |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
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diff
changeset
|
663 <example> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
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diff
changeset
|
664 # status is not one of 301, 302, 303, or 307, and header does not have "Refresh:" |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
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diff
changeset
|
665 match not_redirect { |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
666 status ! 301-303 307; |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
667 header ! Refresh; |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
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diff
changeset
|
668 } |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
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diff
changeset
|
669 </example> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
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diff
changeset
|
670 |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
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diff
changeset
|
671 <example> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
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diff
changeset
|
672 # status ok and not in maintenance mode |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
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diff
changeset
|
673 match server_ok { |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
674 status 200-399; |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
675 body !~ "maintenance mode"; |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
676 } |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
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diff
changeset
|
677 </example> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
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diff
changeset
|
678 |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
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diff
changeset
|
679 </para> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
680 |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
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diff
changeset
|
681 <para> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
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diff
changeset
|
682 <note> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
683 This directive is available as part of our <commercial_version/> only. |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
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diff
changeset
|
684 </note> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
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diff
changeset
|
685 </para> |
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Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
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diff
changeset
|
686 |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
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diff
changeset
|
687 </directive> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
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diff
changeset
|
688 |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
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diff
changeset
|
689 |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
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diff
changeset
|
690 <directive name="sticky_cookie_insert"> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
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diff
changeset
|
691 <syntax><value>name</value> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
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diff
changeset
|
692 [<literal>expires=</literal><value>time</value>] |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
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diff
changeset
|
693 [<literal>domain=</literal><value>host</value>] |
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Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
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diff
changeset
|
694 [<literal>path=</literal><value>path</value>]</syntax> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
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diff
changeset
|
695 <default/> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
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diff
changeset
|
696 <context>upstream</context> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
697 |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
698 <para> |
962
f3754c623e6b
Minor editing of the stiky_cookie_insert directive.
Egor Nikitin <yegor.nikitin@gmail.com>
parents:
960
diff
changeset
|
699 Enables session affinity, which causes requests from the same client to be |
960
48ab154edf10
Upstream: removed obsoleted directives in the "sticky" module.
Vladimir Homutov <vl@nginx.com>
parents:
956
diff
changeset
|
700 passed to the same server in a group of servers. |
953
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
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diff
changeset
|
701 Example: |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
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diff
changeset
|
702 <example> |
960
48ab154edf10
Upstream: removed obsoleted directives in the "sticky" module.
Vladimir Homutov <vl@nginx.com>
parents:
956
diff
changeset
|
703 upstream backend { |
48ab154edf10
Upstream: removed obsoleted directives in the "sticky" module.
Vladimir Homutov <vl@nginx.com>
parents:
956
diff
changeset
|
704 server backend1.example.com; |
48ab154edf10
Upstream: removed obsoleted directives in the "sticky" module.
Vladimir Homutov <vl@nginx.com>
parents:
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diff
changeset
|
705 server backend2.example.com; |
48ab154edf10
Upstream: removed obsoleted directives in the "sticky" module.
Vladimir Homutov <vl@nginx.com>
parents:
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diff
changeset
|
706 |
48ab154edf10
Upstream: removed obsoleted directives in the "sticky" module.
Vladimir Homutov <vl@nginx.com>
parents:
956
diff
changeset
|
707 sticky_cookie_insert srv_id expires=1h domain=example.com path=/; |
48ab154edf10
Upstream: removed obsoleted directives in the "sticky" module.
Vladimir Homutov <vl@nginx.com>
parents:
956
diff
changeset
|
708 } |
953
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
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diff
changeset
|
709 </example> |
960
48ab154edf10
Upstream: removed obsoleted directives in the "sticky" module.
Vladimir Homutov <vl@nginx.com>
parents:
956
diff
changeset
|
710 </para> |
48ab154edf10
Upstream: removed obsoleted directives in the "sticky" module.
Vladimir Homutov <vl@nginx.com>
parents:
956
diff
changeset
|
711 |
48ab154edf10
Upstream: removed obsoleted directives in the "sticky" module.
Vladimir Homutov <vl@nginx.com>
parents:
956
diff
changeset
|
712 <para> |
48ab154edf10
Upstream: removed obsoleted directives in the "sticky" module.
Vladimir Homutov <vl@nginx.com>
parents:
956
diff
changeset
|
713 A request that comes from a client not yet bound to a particular server |
48ab154edf10
Upstream: removed obsoleted directives in the "sticky" module.
Vladimir Homutov <vl@nginx.com>
parents:
956
diff
changeset
|
714 is passed to the server selected by the configured balancing method. |
48ab154edf10
Upstream: removed obsoleted directives in the "sticky" module.
Vladimir Homutov <vl@nginx.com>
parents:
956
diff
changeset
|
715 Further requests from the same client are passed to the same server. |
48ab154edf10
Upstream: removed obsoleted directives in the "sticky" module.
Vladimir Homutov <vl@nginx.com>
parents:
956
diff
changeset
|
716 If a request cannot be processed by the bound server, the new server |
48ab154edf10
Upstream: removed obsoleted directives in the "sticky" module.
Vladimir Homutov <vl@nginx.com>
parents:
956
diff
changeset
|
717 is selected as if the client was not yet bound. |
48ab154edf10
Upstream: removed obsoleted directives in the "sticky" module.
Vladimir Homutov <vl@nginx.com>
parents:
956
diff
changeset
|
718 </para> |
48ab154edf10
Upstream: removed obsoleted directives in the "sticky" module.
Vladimir Homutov <vl@nginx.com>
parents:
956
diff
changeset
|
719 |
48ab154edf10
Upstream: removed obsoleted directives in the "sticky" module.
Vladimir Homutov <vl@nginx.com>
parents:
956
diff
changeset
|
720 <para> |
962
f3754c623e6b
Minor editing of the stiky_cookie_insert directive.
Egor Nikitin <yegor.nikitin@gmail.com>
parents:
960
diff
changeset
|
721 Information about the bound server is kept in an HTTP cookie. |
953
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
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diff
changeset
|
722 The first parameter sets the name of the cookie to be inserted or inspected. |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
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diff
changeset
|
723 Additional parameters may be as follows: |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
724 <list type="tag"> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
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diff
changeset
|
725 |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
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diff
changeset
|
726 <tag-name><literal>expires</literal></tag-name> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
727 <tag-desc> |
956
488a3f738db0
Text revision of commercial modules.
Egor Nikitin <yegor.nikitin@gmail.com>
parents:
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diff
changeset
|
728 Sets the time for which a browser should keep the cookie. |
960
48ab154edf10
Upstream: removed obsoleted directives in the "sticky" module.
Vladimir Homutov <vl@nginx.com>
parents:
956
diff
changeset
|
729 The parameter <literal>max</literal> will cause the cookie to expire on |
953
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
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diff
changeset
|
730 “<literal>31 Dec 2037 23:55:55 GMT</literal>”. |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
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diff
changeset
|
731 This is the maximum time understood by old browsers. |
960
48ab154edf10
Upstream: removed obsoleted directives in the "sticky" module.
Vladimir Homutov <vl@nginx.com>
parents:
956
diff
changeset
|
732 If the parameter is not specified, it will cause the cookie to expire at |
48ab154edf10
Upstream: removed obsoleted directives in the "sticky" module.
Vladimir Homutov <vl@nginx.com>
parents:
956
diff
changeset
|
733 the end of a browser session. |
953
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
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diff
changeset
|
734 </tag-desc> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
735 |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
736 <tag-name><literal>domain</literal></tag-name> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
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diff
changeset
|
737 <tag-desc> |
956
488a3f738db0
Text revision of commercial modules.
Egor Nikitin <yegor.nikitin@gmail.com>
parents:
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diff
changeset
|
738 Defines the domain for which the cookie is set. |
953
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
739 </tag-desc> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
740 |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
741 <tag-name><literal>path</literal></tag-name> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
742 <tag-desc> |
956
488a3f738db0
Text revision of commercial modules.
Egor Nikitin <yegor.nikitin@gmail.com>
parents:
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diff
changeset
|
743 Defines the path for which the cookie is set. |
953
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
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diff
changeset
|
744 </tag-desc> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
745 |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
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diff
changeset
|
746 </list> |
956
488a3f738db0
Text revision of commercial modules.
Egor Nikitin <yegor.nikitin@gmail.com>
parents:
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diff
changeset
|
747 If some parameter is omitted, the corresponding cookie field is not set. |
953
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
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diff
changeset
|
748 </para> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
749 |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
750 <para> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
751 <note> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
752 This directive is available as part of our <commercial_version/> only. |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
753 </note> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
754 </para> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
755 |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
756 </directive> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
757 |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
758 |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
759 <directive name="upstream_conf"> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
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diff
changeset
|
760 <syntax/> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
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diff
changeset
|
761 <default/> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
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diff
changeset
|
762 <context>location</context> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
763 |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
764 <para> |
956
488a3f738db0
Text revision of commercial modules.
Egor Nikitin <yegor.nikitin@gmail.com>
parents:
955
diff
changeset
|
765 Turns on the HTTP interface of upstream configuration in the surrounding |
488a3f738db0
Text revision of commercial modules.
Egor Nikitin <yegor.nikitin@gmail.com>
parents:
955
diff
changeset
|
766 location. |
953
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
767 Access to this location should be |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
768 <link doc="ngx_http_core_module.xml" id="satisfy">limited</link>. |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
769 </para> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
770 |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
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diff
changeset
|
771 <para> |
956
488a3f738db0
Text revision of commercial modules.
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parents:
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diff
changeset
|
772 Configuration commands can be used to: |
953
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
773 <list type="bullet"> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
774 |
aded7086e84f
Commercial version documentation.
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parents:
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diff
changeset
|
775 <listitem>view all primary or backup servers in a group;</listitem> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
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diff
changeset
|
776 |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
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diff
changeset
|
777 <listitem>view an individual server;</listitem> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
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diff
changeset
|
778 |
aded7086e84f
Commercial version documentation.
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parents:
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diff
changeset
|
779 <listitem>modify an individual server;</listitem> |
aded7086e84f
Commercial version documentation.
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parents:
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diff
changeset
|
780 |
956
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Text revision of commercial modules.
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parents:
955
diff
changeset
|
781 <listitem>add a new server (see the note below);</listitem> |
953
aded7086e84f
Commercial version documentation.
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parents:
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diff
changeset
|
782 |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
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diff
changeset
|
783 <listitem>remove an individual server.</listitem> |
aded7086e84f
Commercial version documentation.
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parents:
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diff
changeset
|
784 |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
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diff
changeset
|
785 </list> |
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786 <note> |
956
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787 As noted in the <link id="server"/> directive, specifying a server |
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788 as a domain name may result in several servers being added to the group. |
953
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789 Since addresses in a group are not required to be unique, individual |
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790 servers in a group can be uniquely referenced to only by their ID. |
956
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791 IDs are assigned automatically and shown on viewing of the group configuration. |
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792 </note> |
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|
793 </para> |
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|
794 |
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|
795 <para> |
956
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796 A configuration command consists of parameters passed as request arguments, |
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797 for example: |
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798 <example> |
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799 http://127.0.0.1/upstream_conf?upstream=appservers |
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800 </example> |
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801 </para> |
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802 |
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803 <para> |
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804 The following parameters are supported: |
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805 |
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806 <list type="tag" compact="no"> |
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807 |
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808 <tag-name> |
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809 <literal>upstream=</literal><value>name</value></tag-name> |
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810 <tag-desc> |
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811 Selects a group. |
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812 This parameter is mandatory. |
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813 </tag-desc> |
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814 |
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|
815 <tag-name> |
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816 <literal>backup=</literal> |
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817 </tag-name> |
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818 <tag-desc> |
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819 If not set, selects primary servers in the group. |
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820 If set, selects backup servers in the group. |
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821 </tag-desc> |
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822 |
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823 <tag-name> |
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824 <literal>id=</literal><value>number</value></tag-name> |
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825 <tag-desc> |
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826 Selects an individual primary or backup server in the group. |
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827 </tag-desc> |
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828 |
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829 <tag-name> |
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830 <literal>remove=</literal></tag-name> |
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831 <tag-desc> |
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832 Removes an individual primary or backup server from the group. |
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833 </tag-desc> |
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834 |
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835 <tag-name> |
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836 <literal>add=</literal></tag-name> |
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837 <tag-desc> |
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838 Adds a new primary or backup server to the group. |
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839 </tag-desc> |
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|
840 |
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|
841 <tag-name> |
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842 <literal>server=</literal><value>address</value></tag-name> |
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843 <tag-desc> |
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844 Same as the “<literal>address</literal>” parameter |
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845 of the <link id="server"/> directive. |
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|
846 </tag-desc> |
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|
847 |
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|
848 <tag-name> |
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849 <literal>weight=</literal><value>number</value></tag-name> |
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850 <tag-desc> |
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851 Same as the “<literal>weight</literal>” parameter |
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852 of the <link id="server"/> directive. |
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|
853 </tag-desc> |
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|
854 |
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|
855 <tag-name> |
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856 <literal>max_fails=</literal><value>number</value></tag-name> |
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857 <tag-desc> |
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858 Same as the “<literal>max_fails</literal>” parameter |
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859 of the <link id="server"/> directive. |
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|
860 </tag-desc> |
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|
861 |
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|
862 <tag-name> |
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863 <literal>fail_timeout=</literal><value>time</value></tag-name> |
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864 <tag-desc> |
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865 Same as the “<literal>fail_timeout</literal>” parameter |
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866 of the <link id="server"/> directive. |
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|
867 </tag-desc> |
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|
868 |
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869 <tag-name> |
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870 <literal>slow_start=</literal><value>time</value></tag-name> |
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|
871 <tag-desc> |
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872 Same as the “<literal>slow_start</literal>” parameter |
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|
873 of the <link id="server"/> directive. |
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|
874 </tag-desc> |
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|
875 |
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|
876 <tag-name> |
953
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877 <literal>down=</literal></tag-name> |
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|
878 <tag-desc> |
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879 Same as the “<literal>down</literal>” parameter |
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880 of the <link id="server"/> directive. |
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|
881 </tag-desc> |
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|
882 |
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|
883 <tag-name> |
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|
884 <literal>up=</literal></tag-name> |
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|
885 <tag-desc> |
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|
886 The opposite of the “<literal>down</literal>” parameter |
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|
887 of the <link id="server"/> directive. |
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|
888 </tag-desc> |
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|
889 |
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|
890 </list> |
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|
891 |
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892 The first three parameters select a target the command applies to. |
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893 Without other parameters, the command shows configuration of the selected |
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|
894 target. |
953
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|
895 </para> |
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|
896 |
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|
897 <para> |
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|
898 For example, to view the primary servers in the group, send: |
953
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|
899 <example> |
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|
900 http://127.0.0.1/upstream_conf?upstream=appservers |
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|
901 </example> |
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|
902 |
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|
903 To view the backup servers in the group, send: |
953
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|
904 <example> |
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905 http://127.0.0.1/upstream_conf?upstream=appservers&backup= |
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|
906 </example> |
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|
907 |
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|
908 To view an individual primary server in the group, send: |
953
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|
909 <example> |
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|
910 http://127.0.0.1/upstream_conf?upstream=appservers&id=42 |
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911 </example> |
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|
912 |
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changeset
|
913 To view an individual backup server in the group, send: |
953
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|
914 <example> |
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|
915 http://127.0.0.1/upstream_conf?upstream=appservers&backup=&id=42 |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
916 </example> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
917 </para> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
918 |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
919 <para> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
920 To add a new primary or backup server to the group, |
956
488a3f738db0
Text revision of commercial modules.
Egor Nikitin <yegor.nikitin@gmail.com>
parents:
955
diff
changeset
|
921 specify its address in the “<literal>server=</literal>” parameter. |
953
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
922 Without other parameters specified, a server will be added with other |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
923 parameters set to their default values (see the <link id="server"/> directive). |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
924 </para> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
925 |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
926 <para> |
956
488a3f738db0
Text revision of commercial modules.
Egor Nikitin <yegor.nikitin@gmail.com>
parents:
955
diff
changeset
|
927 For example, to add a new primary server to the group, send: |
953
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
928 <example> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
929 http://127.0.0.1/upstream_conf?add=&upstream=appservers&server=127.0.0.1:8080 |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
930 </example> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
931 |
956
488a3f738db0
Text revision of commercial modules.
Egor Nikitin <yegor.nikitin@gmail.com>
parents:
955
diff
changeset
|
932 To add a new backup server to the group, send: |
953
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
933 <example> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
934 http://127.0.0.1/upstream_conf?add=&upstream=appservers&backup=&server=127.0.0.1:8080 |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
935 </example> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
936 |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
937 To add a new primary server to the group, |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
938 set its parameters to non-default values |
968
fa19bacf6e1e
Unified upstream server up/down state terminology.
Vladimir Homutov <vl@nginx.com>
parents:
966
diff
changeset
|
939 and mark it as “<literal>down</literal>”, send: |
953
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
940 <example> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
941 http://127.0.0.1/upstream_conf?add=&upstream=appservers&server=127.0.0.1:8080&weight=2&max_fails=3&fail_timeout=3s&down= |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
942 </example> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
943 </para> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
944 |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
945 <para> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
946 To remove an individual primary or backup server from the group, |
956
488a3f738db0
Text revision of commercial modules.
Egor Nikitin <yegor.nikitin@gmail.com>
parents:
955
diff
changeset
|
947 select it with the <literal>id=</literal> parameter. |
953
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
948 </para> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
949 |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
950 <para> |
956
488a3f738db0
Text revision of commercial modules.
Egor Nikitin <yegor.nikitin@gmail.com>
parents:
955
diff
changeset
|
951 For example, to remove an individual primary server from the group, send: |
953
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
952 <example> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
953 http://127.0.0.1/upstream_conf?remove=&upstream=appservers&id=42 |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
954 </example> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
955 |
956
488a3f738db0
Text revision of commercial modules.
Egor Nikitin <yegor.nikitin@gmail.com>
parents:
955
diff
changeset
|
956 To remove an individual backup server from the group, send: |
953
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
957 <example> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
958 http://127.0.0.1/upstream_conf?remove=&upstream=appservers&backup=&id=42 |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
959 </example> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
960 </para> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
961 |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
962 <para> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
963 To modify an individual primary or backup server in the group, |
956
488a3f738db0
Text revision of commercial modules.
Egor Nikitin <yegor.nikitin@gmail.com>
parents:
955
diff
changeset
|
964 select it with the <literal>id=</literal> parameter. |
953
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
965 </para> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
966 |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
967 <para> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
968 For example, to modify an individual primary server in the group |
956
488a3f738db0
Text revision of commercial modules.
Egor Nikitin <yegor.nikitin@gmail.com>
parents:
955
diff
changeset
|
969 by marking it as “<literal>down</literal>”, send: |
953
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
970 <example> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
971 http://127.0.0.1/upstream_conf?upstream=appservers&id=42&down= |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
972 </example> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
973 |
956
488a3f738db0
Text revision of commercial modules.
Egor Nikitin <yegor.nikitin@gmail.com>
parents:
955
diff
changeset
|
974 To modify the address of an individual backup server in the group, send: |
953
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
975 <example> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
976 http://127.0.0.1/upstream_conf?upstream=appservers&backup=&id=42&server=192.0.2.3:8123 |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
977 </example> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
978 |
956
488a3f738db0
Text revision of commercial modules.
Egor Nikitin <yegor.nikitin@gmail.com>
parents:
955
diff
changeset
|
979 To modify other parameters of an individual primary server in the group, send: |
953
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
980 <example> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
981 http://127.0.0.1/upstream_conf?upstream=appservers&id=42&max_fails=3&weight=4 |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
982 </example> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
983 |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
984 </para> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
985 |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
986 <para> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
987 <note> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
988 This directive is available as part of our <commercial_version/> only. |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
989 </note> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
990 </para> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
991 |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
992 </directive> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
993 |
293
34246e706f48
English translation of the ngx_http_upstream_module documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
994 </section> |
34246e706f48
English translation of the ngx_http_upstream_module documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
995 |
34246e706f48
English translation of the ngx_http_upstream_module documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
996 |
34246e706f48
English translation of the ngx_http_upstream_module documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
997 <section id="variables" name="Embedded Variables"> |
34246e706f48
English translation of the ngx_http_upstream_module documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
998 |
34246e706f48
English translation of the ngx_http_upstream_module documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
999 <para> |
34246e706f48
English translation of the ngx_http_upstream_module documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
1000 The <literal>ngx_http_upstream_module</literal> module |
34246e706f48
English translation of the ngx_http_upstream_module documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
1001 supports the following embedded variables: |
34246e706f48
English translation of the ngx_http_upstream_module documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
1002 <list type="tag"> |
34246e706f48
English translation of the ngx_http_upstream_module documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
1003 |
34246e706f48
English translation of the ngx_http_upstream_module documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
1004 <tag-name><var>$upstream_addr</var></tag-name> |
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English translation of the ngx_http_upstream_module documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
1005 <tag-desc> |
966 | 1006 keeps the IP address and port of the server, |
1007 or the path to the UNIX-domain socket. | |
293
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English translation of the ngx_http_upstream_module documentation.
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parents:
diff
changeset
|
1008 If several servers were contacted during request processing, |
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English translation of the ngx_http_upstream_module documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
1009 their addresses are separated by commas, e.g. |
34246e706f48
English translation of the ngx_http_upstream_module documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
1010 “<literal>192.168.1.1:80, 192.168.1.2:80, unix:/tmp/sock</literal>”. |
966 | 1011 If an internal redirect from one server group to another happens, |
1012 initiated by | |
293
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English translation of the ngx_http_upstream_module documentation.
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parents:
diff
changeset
|
1013 <header>X-Accel-Redirect</header> or |
966 | 1014 <link doc="ngx_http_core_module.xml" id="error_page"/>, |
1015 then the server addresses from different groups are separated by colons, e.g. | |
293
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parents:
diff
changeset
|
1016 “<literal>192.168.1.1:80, 192.168.1.2:80, unix:/tmp/sock : 192.168.10.1:80, 192.168.10.2:80</literal>”. |
34246e706f48
English translation of the ngx_http_upstream_module documentation.
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parents:
diff
changeset
|
1017 </tag-desc> |
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English translation of the ngx_http_upstream_module documentation.
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parents:
diff
changeset
|
1018 |
731
f62328124e5b
Documented $upstream_cache_status and $upstream_response_length variables.
Vladimir Homutov <vl@nginx.com>
parents:
654
diff
changeset
|
1019 <tag-name><var>$upstream_cache_status</var></tag-name> |
f62328124e5b
Documented $upstream_cache_status and $upstream_response_length variables.
Vladimir Homutov <vl@nginx.com>
parents:
654
diff
changeset
|
1020 <tag-desc> |
966 | 1021 keeps the status of accessing a response cache (0.8.3). |
1022 The status can be either “<literal>MISS</literal>”, | |
731
f62328124e5b
Documented $upstream_cache_status and $upstream_response_length variables.
Vladimir Homutov <vl@nginx.com>
parents:
654
diff
changeset
|
1023 “<literal>BYPASS</literal>”, “<literal>EXPIRED</literal>”, |
f62328124e5b
Documented $upstream_cache_status and $upstream_response_length variables.
Vladimir Homutov <vl@nginx.com>
parents:
654
diff
changeset
|
1024 “<literal>STALE</literal>”, “<literal>UPDATING</literal>” or |
f62328124e5b
Documented $upstream_cache_status and $upstream_response_length variables.
Vladimir Homutov <vl@nginx.com>
parents:
654
diff
changeset
|
1025 “<literal>HIT</literal>”. |
f62328124e5b
Documented $upstream_cache_status and $upstream_response_length variables.
Vladimir Homutov <vl@nginx.com>
parents:
654
diff
changeset
|
1026 </tag-desc> |
f62328124e5b
Documented $upstream_cache_status and $upstream_response_length variables.
Vladimir Homutov <vl@nginx.com>
parents:
654
diff
changeset
|
1027 |
f62328124e5b
Documented $upstream_cache_status and $upstream_response_length variables.
Vladimir Homutov <vl@nginx.com>
parents:
654
diff
changeset
|
1028 <tag-name><var>$upstream_response_length</var></tag-name> |
f62328124e5b
Documented $upstream_cache_status and $upstream_response_length variables.
Vladimir Homutov <vl@nginx.com>
parents:
654
diff
changeset
|
1029 <tag-desc> |
966 | 1030 keeps the lengths of responses obtained from the upstream servers (0.7.27); |
731
f62328124e5b
Documented $upstream_cache_status and $upstream_response_length variables.
Vladimir Homutov <vl@nginx.com>
parents:
654
diff
changeset
|
1031 lengths are kept in bytes. |
966 | 1032 Several response lengths are separated by commas and colons |
1033 like addresses in the <var>$upstream_addr</var> variable. | |
731
f62328124e5b
Documented $upstream_cache_status and $upstream_response_length variables.
Vladimir Homutov <vl@nginx.com>
parents:
654
diff
changeset
|
1034 </tag-desc> |
f62328124e5b
Documented $upstream_cache_status and $upstream_response_length variables.
Vladimir Homutov <vl@nginx.com>
parents:
654
diff
changeset
|
1035 |
293
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parents:
diff
changeset
|
1036 <tag-name><var>$upstream_response_time</var></tag-name> |
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English translation of the ngx_http_upstream_module documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
1037 <tag-desc> |
731
f62328124e5b
Documented $upstream_cache_status and $upstream_response_length variables.
Vladimir Homutov <vl@nginx.com>
parents:
654
diff
changeset
|
1038 keeps times of responses obtained from upstream servers; |
f62328124e5b
Documented $upstream_cache_status and $upstream_response_length variables.
Vladimir Homutov <vl@nginx.com>
parents:
654
diff
changeset
|
1039 times are kept in seconds with a milliseconds resolution. |
966 | 1040 Several response times are separated by commas and colons |
1041 like addresses in the <var>$upstream_addr</var> variable. | |
293
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parents:
diff
changeset
|
1042 </tag-desc> |
34246e706f48
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Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
1043 |
34246e706f48
English translation of the ngx_http_upstream_module documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
1044 <tag-name><var>$upstream_status</var></tag-name> |
34246e706f48
English translation of the ngx_http_upstream_module documentation.
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1045 <tag-desc> |
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1046 keeps codes of responses obtained from upstream servers. |
966 | 1047 Several response codes are separated by commas and colons |
1048 like addresses in the <var>$upstream_addr</var> variable. | |
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1049 </tag-desc> |
34246e706f48
English translation of the ngx_http_upstream_module documentation.
Ruslan Ermilov <ru@nginx.com>
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1050 |
34246e706f48
English translation of the ngx_http_upstream_module documentation.
Ruslan Ermilov <ru@nginx.com>
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1051 <tag-name><var>$upstream_http_...</var></tag-name> |
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English translation of the ngx_http_upstream_module documentation.
Ruslan Ermilov <ru@nginx.com>
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1052 <tag-desc> |
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English translation of the ngx_http_upstream_module documentation.
Ruslan Ermilov <ru@nginx.com>
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1053 keep server response header fields. |
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English translation of the ngx_http_upstream_module documentation.
Ruslan Ermilov <ru@nginx.com>
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1054 For example, the <header>Server</header> response header field |
966 | 1055 is available through the <var>$upstream_http_server</var> variable. |
731
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1056 The rules of converting header field names to variable names are the same |
966 | 1057 as for the variables that start with the |
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1058 “<link doc="ngx_http_core_module.xml" id="variables">$http_</link>” prefix. |
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1059 Only the last server’s response header fields are saved. |
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English translation of the ngx_http_upstream_module documentation.
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1060 </tag-desc> |
34246e706f48
English translation of the ngx_http_upstream_module documentation.
Ruslan Ermilov <ru@nginx.com>
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1061 |
34246e706f48
English translation of the ngx_http_upstream_module documentation.
Ruslan Ermilov <ru@nginx.com>
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1062 </list> |
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English translation of the ngx_http_upstream_module documentation.
Ruslan Ermilov <ru@nginx.com>
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1063 </para> |
34246e706f48
English translation of the ngx_http_upstream_module documentation.
Ruslan Ermilov <ru@nginx.com>
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1064 |
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English translation of the ngx_http_upstream_module documentation.
Ruslan Ermilov <ru@nginx.com>
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1065 </section> |
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English translation of the ngx_http_upstream_module documentation.
Ruslan Ermilov <ru@nginx.com>
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1066 |
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English translation of the ngx_http_upstream_module documentation.
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1067 </module> |