Mercurial > hg > nginx-site
annotate xml/en/docs/http/ngx_http_upstream_conf_module.xml @ 2943:0f468b4e01d6
njs-0.7.11.
author | Yaroslav Zhuravlev <yar@nginx.com> |
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date | Thu, 09 Mar 2023 22:20:24 +0000 |
parents | 283b1e67eaa6 |
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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) Nginx, Inc. |
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5 --> |
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6 |
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7 <!DOCTYPE module SYSTEM "../../../../dtd/module.dtd"> |
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8 |
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9 <module name="Module ngx_http_upstream_conf_module" |
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10 link="/en/docs/http/ngx_http_upstream_conf_module.html" |
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12 rev="6"> |
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13 |
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14 <section id="summary"> |
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15 |
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16 <para> |
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17 The <literal>ngx_http_upstream_conf_module</literal> module |
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18 allows configuring upstream server groups on-the-fly |
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19 via a simple HTTP interface without the need of restarting nginx. |
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20 The |
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21 <link doc="ngx_http_upstream_module.xml" id="zone">http</link> |
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22 or |
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23 <link doc="../stream/ngx_stream_upstream_module.xml" id="zone">stream</link> |
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24 server group must reside in the shared memory. |
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25 <note> |
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26 This module was available as part of our |
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27 <commercial_version>commercial subscription</commercial_version> |
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28 until 1.13.10. |
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29 It was superseded by the |
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30 <link doc="ngx_http_api_module.xml">ngx_http_api_module</link> module |
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31 in 1.13.3. |
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32 </note> |
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33 </para> |
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34 |
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35 </section> |
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36 |
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37 |
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38 <section id="example" name="Example Configuration"> |
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39 |
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40 <para> |
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41 <example> |
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42 upstream backend { |
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43 zone upstream_backend 64k; |
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44 |
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45 ... |
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46 } |
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47 |
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48 server { |
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49 location /upstream_conf { |
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50 <emphasis>upstream_conf</emphasis>; |
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51 allow 127.0.0.1; |
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52 deny all; |
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53 } |
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54 } |
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55 </example> |
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56 </para> |
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57 |
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58 </section> |
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59 |
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60 |
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61 <section id="directives" name="Directives"> |
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62 |
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63 <directive name="upstream_conf"> |
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64 <syntax/> |
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65 <default/> |
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66 <context>location</context> |
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67 |
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68 <para> |
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69 Turns on the HTTP interface of upstream configuration in the surrounding |
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70 location. |
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71 Access to this location should be |
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72 <link doc="ngx_http_core_module.xml" id="satisfy">limited</link>. |
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73 </para> |
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74 |
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75 <para> |
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76 Configuration commands can be used to: |
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77 <list type="bullet"> |
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78 |
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79 <listitem>view the group configuration;</listitem> |
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80 |
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81 <listitem>view, modify, or remove a server;</listitem> |
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82 |
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83 <listitem>add a new server.</listitem> |
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84 |
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85 </list> |
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86 <note> |
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87 Since addresses in a group are not required to be unique, specific |
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88 servers in a group are referenced by their IDs. |
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89 IDs are assigned automatically and shown when adding a new server |
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90 or viewing the group configuration. |
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91 </note> |
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92 </para> |
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93 |
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94 <para> |
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95 A configuration command consists of parameters passed as request arguments, |
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96 for example: |
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97 <example> |
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98 http://127.0.0.1/upstream_conf?upstream=backend |
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99 </example> |
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100 </para> |
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101 |
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102 <para> |
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103 The following parameters are supported: |
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104 |
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105 <list type="tag" compact="no"> |
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106 |
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107 <tag-name> |
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108 <literal>stream=</literal></tag-name> |
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109 <tag-desc> |
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110 Selects a |
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111 <link doc="../stream/ngx_stream_upstream_module.xml">stream</link> |
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112 upstream server group. |
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113 Without this parameter, selects an |
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114 <link doc="ngx_http_upstream_module.xml">http</link> |
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115 upstream server group. |
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116 </tag-desc> |
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117 |
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118 <tag-name> |
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119 <literal>upstream=</literal><value>name</value></tag-name> |
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120 <tag-desc> |
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121 Selects a group to work with. |
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122 This parameter is mandatory. |
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123 </tag-desc> |
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124 |
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125 <tag-name> |
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126 <literal>id=</literal><value>number</value></tag-name> |
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127 <tag-desc> |
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128 Selects a server for viewing, modifying, or removing. |
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129 </tag-desc> |
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130 |
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131 <tag-name> |
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132 <literal>remove=</literal></tag-name> |
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133 <tag-desc> |
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134 Removes a server from the group. |
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135 </tag-desc> |
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136 |
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137 <tag-name> |
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138 <literal>add=</literal></tag-name> |
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139 <tag-desc> |
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140 Adds a new server to the group. |
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141 </tag-desc> |
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142 |
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143 <tag-name> |
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144 <literal>backup=</literal></tag-name> |
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145 <tag-desc> |
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146 Required to add a backup server. |
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147 <note> |
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148 Before version 1.7.2, <literal>backup=</literal> |
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149 was also required to view, modify, or remove existing backup servers. |
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150 </note> |
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151 </tag-desc> |
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152 |
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153 <tag-name> |
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154 <literal>server=</literal><value>address</value></tag-name> |
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155 <tag-desc> |
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156 Same as the “<literal>address</literal>” parameter |
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157 of the |
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158 <link doc="ngx_http_upstream_module.xml" id="server">http</link> |
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159 or |
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160 <link doc="../stream/ngx_stream_upstream_module.xml" id="server">stream</link> |
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161 upstream server. |
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162 <para> |
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163 When adding a server, it is possible to specify it as a domain name. |
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164 In this case, changes of the IP addresses that correspond to a domain name |
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165 will be monitored and automatically applied to the upstream |
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166 configuration without the need of restarting nginx (1.7.2). |
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167 This requires the “<literal>resolver</literal>” directive in the |
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168 <link doc="ngx_http_core_module.xml" id="resolver">http</link> |
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169 or |
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170 <link doc="../stream/ngx_stream_core_module.xml" id="resolver">stream</link> |
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171 block. |
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172 See also the “<literal>resolve</literal>” parameter |
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173 of the |
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174 <link doc="ngx_http_upstream_module.xml" id="resolve">http</link> |
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175 or |
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176 <link doc="../stream/ngx_stream_upstream_module.xml" id="resolve">stream</link> |
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177 upstream server. |
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178 </para> |
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179 </tag-desc> |
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180 |
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181 <tag-name> |
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182 <literal>service=</literal><value>name</value></tag-name> |
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183 <tag-desc> |
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184 Same as the “<literal>service</literal>” parameter |
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185 of the |
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186 <link doc="ngx_http_upstream_module.xml" id="service">http</link> |
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187 or |
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188 <link doc="../stream/ngx_stream_upstream_module.xml" id="service">stream</link> |
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189 upstream server (1.9.13). |
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190 </tag-desc> |
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191 |
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192 <tag-name> |
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193 <literal>weight=</literal><value>number</value></tag-name> |
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194 <tag-desc> |
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195 Same as the “<literal>weight</literal>” parameter |
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196 of the |
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197 <link doc="ngx_http_upstream_module.xml" id="weight">http</link> |
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198 or |
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199 <link doc="../stream/ngx_stream_upstream_module.xml" id="weight">stream</link> |
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200 upstream server. |
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201 </tag-desc> |
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202 |
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203 <tag-name> |
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204 <literal>max_conns=</literal><value>number</value></tag-name> |
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205 <tag-desc> |
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206 Same as the “<literal>max_conns</literal>” parameter |
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207 of the |
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208 <link doc="ngx_http_upstream_module.xml" id="max_conns">http</link> |
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209 or |
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210 <link doc="../stream/ngx_stream_upstream_module.xml" id="max_conns">stream</link> |
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211 upstream server. |
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212 </tag-desc> |
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213 |
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214 <tag-name> |
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215 <literal>max_fails=</literal><value>number</value></tag-name> |
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216 <tag-desc> |
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217 Same as the “<literal>max_fails</literal>” parameter |
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218 of the |
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219 <link doc="ngx_http_upstream_module.xml" id="max_fails">http</link> |
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220 or |
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221 <link doc="../stream/ngx_stream_upstream_module.xml" id="max_fails">stream</link> |
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222 upstream server. |
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223 </tag-desc> |
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224 |
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225 <tag-name> |
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226 <literal>fail_timeout=</literal><value>time</value></tag-name> |
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227 <tag-desc> |
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228 Same as the “<literal>fail_timeout</literal>” parameter |
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229 of the |
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230 <link doc="ngx_http_upstream_module.xml" id="fail_timeout">http</link> |
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231 or |
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232 <link doc="../stream/ngx_stream_upstream_module.xml" id="fail_timeout">stream</link> |
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233 upstream server. |
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234 </tag-desc> |
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235 |
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236 <tag-name> |
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237 <literal>slow_start=</literal><value>time</value></tag-name> |
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238 <tag-desc> |
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239 Same as the “<literal>slow_start</literal>” parameter |
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240 of the |
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241 <link doc="ngx_http_upstream_module.xml" id="slow_start">http</link> |
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242 or |
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243 <link doc="../stream/ngx_stream_upstream_module.xml" id="slow_start">stream</link> |
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244 upstream server. |
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245 </tag-desc> |
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246 |
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247 <tag-name> |
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248 <literal>down=</literal></tag-name> |
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249 <tag-desc> |
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250 Same as the “<literal>down</literal>” parameter |
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251 of the |
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252 <link doc="ngx_http_upstream_module.xml" id="down">http</link> |
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253 or |
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254 <link doc="../stream/ngx_stream_upstream_module.xml" id="down">stream</link> |
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255 upstream server. |
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256 </tag-desc> |
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257 |
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258 <tag-name id="drain"><literal>drain=</literal></tag-name> |
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259 <tag-desc> |
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260 Puts the |
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261 <link doc="ngx_http_upstream_module.xml">http</link> |
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262 upstream server into the “draining” mode (1.7.5). |
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263 In this mode, only requests |
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264 <link doc="ngx_http_upstream_module.xml" id="sticky">bound</link> to the server |
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265 will be proxied to it. |
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266 </tag-desc> |
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267 |
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268 <tag-name> |
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269 <literal>up=</literal></tag-name> |
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270 <tag-desc> |
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271 The opposite of the “<literal>down</literal>” parameter |
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272 of the |
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273 <link doc="ngx_http_upstream_module.xml" id="down">http</link> |
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274 or |
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275 <link doc="../stream/ngx_stream_upstream_module.xml" id="down">stream</link> |
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276 upstream server. |
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277 </tag-desc> |
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278 |
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279 <tag-name> |
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280 <literal>route=</literal><value>string</value></tag-name> |
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281 <tag-desc> |
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282 Same as the “<literal>route</literal>” parameter of the |
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283 <link doc="ngx_http_upstream_module.xml" id="route">http</link> |
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284 upstream server. |
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285 </tag-desc> |
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286 |
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287 </list> |
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288 |
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289 The first three parameters select an object. |
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290 This can be either the whole http or stream upstream server group, |
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291 or a specific server. |
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292 Without other parameters, the configuration of the selected |
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293 group or server is shown. |
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294 </para> |
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295 |
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296 <para> |
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297 For example, to view the configuration of the whole group, send: |
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298 <example> |
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299 http://127.0.0.1/upstream_conf?upstream=backend |
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300 </example> |
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301 |
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302 To view the configuration of a specific server, also specify its ID: |
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303 <example> |
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304 http://127.0.0.1/upstream_conf?upstream=backend&id=42 |
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305 </example> |
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306 </para> |
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307 |
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308 <para> |
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309 To add a new server, |
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310 specify its address in the “<literal>server=</literal>” parameter. |
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311 Without other parameters specified, a server will be added with other |
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312 parameters set to their default values (see the |
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313 <link doc="ngx_http_upstream_module.xml" id="server">http</link> |
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314 or |
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315 <link doc="../stream/ngx_stream_upstream_module.xml" id="server">stream</link> |
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316 “<literal>server</literal>” directive). |
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317 </para> |
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318 |
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319 <para> |
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320 For example, to add a new primary server, send: |
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321 <example> |
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322 http://127.0.0.1/upstream_conf?add=&upstream=backend&server=127.0.0.1:8080 |
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323 </example> |
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324 |
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325 To add a new backup server, send: |
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326 <example> |
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327 http://127.0.0.1/upstream_conf?add=&upstream=backend&backup=&server=127.0.0.1:8080 |
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328 </example> |
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329 |
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330 To add a new primary server, |
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331 set its parameters to non-default values |
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332 and mark it as “<literal>down</literal>”, send: |
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333 <example> |
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334 http://127.0.0.1/upstream_conf?add=&upstream=backend&server=127.0.0.1:8080&weight=2&down= |
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335 </example> |
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336 |
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337 To remove a server, specify its ID: |
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338 <example> |
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339 http://127.0.0.1/upstream_conf?remove=&upstream=backend&id=42 |
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340 </example> |
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341 |
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342 To mark an existing server as “<literal>down</literal>”, send: |
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343 <example> |
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344 http://127.0.0.1/upstream_conf?upstream=backend&id=42&down= |
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345 </example> |
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346 |
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347 To modify the address of an existing server, send: |
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348 <example> |
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349 http://127.0.0.1/upstream_conf?upstream=backend&id=42&server=192.0.2.3:8123 |
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350 </example> |
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351 |
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352 To modify other parameters of an existing server, send: |
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353 <example> |
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354 http://127.0.0.1/upstream_conf?upstream=backend&id=42&max_fails=3&weight=4 |
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355 </example> |
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356 |
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357 The above examples are for an |
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358 <link doc="ngx_http_upstream_module.xml">http</link> |
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359 upstream server group. |
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360 Similar examples for a |
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Ruslan Ermilov <ru@nginx.com>
parents:
1424
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361 <link doc="../stream/ngx_stream_upstream_module.xml">stream</link> |
f5b5eefc43cb
Updated commercial docs for the upcoming release.
Ruslan Ermilov <ru@nginx.com>
parents:
1424
diff
changeset
|
362 upstream server group require the “<literal>stream=</literal>” parameter. |
953
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
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changeset
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363 </para> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
364 |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
365 </directive> |
aded7086e84f
Commercial version documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
942
diff
changeset
|
366 |
293
34246e706f48
English translation of the ngx_http_upstream_module documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
367 </section> |
34246e706f48
English translation of the ngx_http_upstream_module documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
368 |
34246e706f48
English translation of the ngx_http_upstream_module documentation.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
369 </module> |