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annotate xml/en/docs/http/ngx_http_upstream_conf_module.xml @ 1740:32bbadb5b64c

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Corrected language of the "drain" parameter in upstream_conf.
author Yaroslav Zhuravlev <yar@nginx.com>
date Tue, 05 Jul 2016 16:24:04 +0300
parents 57c3f36b3b6a
children 5c55b7054b58
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34246e706f48 English translation of the ngx_http_upstream_module documentation.
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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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11 lang="en"
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12 rev="3">
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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 is available as part of our
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27 <commercial_version>commercial subscription</commercial_version>.
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28 </note>
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29 </para>
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30
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31 </section>
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32
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33
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34 <section id="example" name="Example Configuration">
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35
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36 <para>
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37 <example>
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38 upstream backend {
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39 zone upstream_backend 64k;
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40
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41 ...
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42 }
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43
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44 server {
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45 location /upstream_conf {
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46 <emphasis>upstream_conf</emphasis>;
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47 allow 127.0.0.1;
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48 deny all;
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49 }
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50 }
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51 </example>
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52 </para>
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53
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54 </section>
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56
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57 <section id="directives" name="Directives">
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58
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59 <directive name="upstream_conf">
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60 <syntax/>
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61 <default/>
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62 <context>location</context>
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63
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64 <para>
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65 Turns on the HTTP interface of upstream configuration in the surrounding
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66 location.
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67 Access to this location should be
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68 <link doc="ngx_http_core_module.xml" id="satisfy">limited</link>.
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69 </para>
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70
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71 <para>
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72 Configuration commands can be used to:
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73 <list type="bullet">
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74
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75 <listitem>view the group configuration;</listitem>
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76
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77 <listitem>view, modify, or remove a server;</listitem>
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78
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79 <listitem>add a new server.</listitem>
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80
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81 </list>
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82 <note>
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83 Since addresses in a group are not required to be unique, specific
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84 servers in a group are referenced by their IDs.
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85 IDs are assigned automatically and shown when adding a new server
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86 or viewing the group configuration.
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87 </note>
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88 </para>
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89
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90 <para>
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91 A configuration command consists of parameters passed as request arguments,
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92 for example:
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93 <example>
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94 http://127.0.0.1/upstream_conf?upstream=backend
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95 </example>
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96 </para>
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97
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98 <para>
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99 The following parameters are supported:
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100
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101 <list type="tag" compact="no">
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102
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103 <tag-name>
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104 <literal>stream=</literal></tag-name>
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105 <tag-desc>
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106 Selects a
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107 <link doc="../stream/ngx_stream_upstream_module.xml">stream</link>
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108 upstream server group.
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109 Without this parameter, selects an
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110 <link doc="ngx_http_upstream_module.xml">http</link>
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111 upstream server group.
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112 </tag-desc>
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113
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114 <tag-name>
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115 <literal>upstream=</literal><value>name</value></tag-name>
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116 <tag-desc>
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117 Selects a group to work with.
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118 This parameter is mandatory.
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119 </tag-desc>
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120
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121 <tag-name>
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122 <literal>id=</literal><value>number</value></tag-name>
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123 <tag-desc>
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124 Selects a server for viewing, modifying, or removing.
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125 </tag-desc>
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126
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127 <tag-name>
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128 <literal>remove=</literal></tag-name>
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129 <tag-desc>
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130 Removes a server from the group.
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131 </tag-desc>
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132
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133 <tag-name>
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134 <literal>add=</literal></tag-name>
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135 <tag-desc>
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136 Adds a new server to the group.
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137 </tag-desc>
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138
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139 <tag-name>
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140 <literal>backup=</literal></tag-name>
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141 <tag-desc>
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142 Required to add a backup server.
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143 <note>
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144 Before version 1.7.2, <literal>backup=</literal>
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145 was also required to view, modify, or remove existing backup servers.
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146 </note>
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147 </tag-desc>
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148
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149 <tag-name>
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150 <literal>server=</literal><value>address</value></tag-name>
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151 <tag-desc>
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152 Same as the “<literal>address</literal>” parameter
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153 of the
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154 <link doc="ngx_http_upstream_module.xml" id="server">http</link>
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155 or
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156 <link doc="../stream/ngx_stream_upstream_module.xml" id="server">stream</link>
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157 upstream server.
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158 <para>
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159 When adding a server, it is possible to specify it as a domain name.
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160 In this case, changes of the IP addresses that correspond to a domain name
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161 will be monitored and automatically applied to the upstream
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162 configuration without the need of restarting nginx (1.7.2).
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163 This requires the “<literal>resolver</literal>” directive in the
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164 <link doc="ngx_http_core_module.xml" id="resolver">http</link>
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165 or
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166 <link doc="../stream/ngx_stream_core_module.xml" id="resolver">stream</link>
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167 block.
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168 See also the “<literal>resolve</literal>” parameter
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169 of the
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170 <link doc="ngx_http_upstream_module.xml" id="resolve">http</link>
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171 or
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172 <link doc="../stream/ngx_stream_upstream_module.xml" id="resolve">stream</link>
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173 upstream server.
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174 </para>
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175 </tag-desc>
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176
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177 <tag-name>
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178 <literal>service=</literal><value>name</value></tag-name>
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179 <tag-desc>
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180 Same as the “<literal>service</literal>” parameter
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181 of the
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182 <link doc="ngx_http_upstream_module.xml" id="service">http</link>
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183 or
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184 <link doc="../stream/ngx_stream_upstream_module.xml" id="service">stream</link>
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185 upstream server (1.9.13).
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186 </tag-desc>
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187
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188 <tag-name>
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189 <literal>weight=</literal><value>number</value></tag-name>
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190 <tag-desc>
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191 Same as the “<literal>weight</literal>” parameter
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192 of the
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193 <link doc="ngx_http_upstream_module.xml" id="weight">http</link>
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194 or
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195 <link doc="../stream/ngx_stream_upstream_module.xml" id="weight">stream</link>
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196 upstream server.
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197 </tag-desc>
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198
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199 <tag-name>
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200 <literal>max_conns=</literal><value>number</value></tag-name>
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201 <tag-desc>
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202 Same as the “<literal>max_conns</literal>” parameter
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203 of the
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204 <link doc="ngx_http_upstream_module.xml" id="max_conns">http</link>
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205 or
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206 <link doc="../stream/ngx_stream_upstream_module.xml" id="max_conns">stream</link>
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207 upstream server.
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208 </tag-desc>
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209
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210 <tag-name>
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211 <literal>max_fails=</literal><value>number</value></tag-name>
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212 <tag-desc>
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213 Same as the “<literal>max_fails</literal>” parameter
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214 of the
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215 <link doc="ngx_http_upstream_module.xml" id="max_fails">http</link>
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216 or
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217 <link doc="../stream/ngx_stream_upstream_module.xml" id="max_fails">stream</link>
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218 upstream server.
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219 </tag-desc>
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220
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221 <tag-name>
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222 <literal>fail_timeout=</literal><value>time</value></tag-name>
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223 <tag-desc>
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224 Same as the “<literal>fail_timeout</literal>” parameter
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225 of the
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226 <link doc="ngx_http_upstream_module.xml" id="fail_timeout">http</link>
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227 or
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228 <link doc="../stream/ngx_stream_upstream_module.xml" id="fail_timeout">stream</link>
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229 upstream server.
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230 </tag-desc>
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231
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232 <tag-name>
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233 <literal>slow_start=</literal><value>time</value></tag-name>
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234 <tag-desc>
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235 Same as the “<literal>slow_start</literal>” parameter
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236 of the
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237 <link doc="ngx_http_upstream_module.xml" id="slow_start">http</link>
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238 or
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239 <link doc="../stream/ngx_stream_upstream_module.xml" id="slow_start">stream</link>
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240 upstream server.
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241 </tag-desc>
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242
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243 <tag-name>
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244 <literal>down=</literal></tag-name>
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245 <tag-desc>
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246 Same as the “<literal>down</literal>” parameter
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247 of the
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248 <link doc="ngx_http_upstream_module.xml" id="down">http</link>
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249 or
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250 <link doc="../stream/ngx_stream_upstream_module.xml" id="down">stream</link>
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251 upstream server.
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252 </tag-desc>
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253
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254 <tag-name id="drain"><literal>drain=</literal></tag-name>
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255 <tag-desc>
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256 Puts the
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257 <link doc="ngx_http_upstream_module.xml">http</link>
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258 upstream server into the “draining” mode (1.7.5).
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259 In this mode, only requests
1450
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260 <link doc="ngx_http_upstream_module.xml" id="sticky">bound</link> to the server
1367
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diff changeset
261 will be proxied to it.
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262 </tag-desc>
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263
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264 <tag-name>
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265 <literal>up=</literal></tag-name>
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266 <tag-desc>
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267 The opposite of the “<literal>down</literal>” parameter
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268 of the
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269 <link doc="ngx_http_upstream_module.xml" id="down">http</link>
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270 or
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271 <link doc="../stream/ngx_stream_upstream_module.xml" id="down">stream</link>
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272 upstream server.
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273 </tag-desc>
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274
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275 <tag-name>
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276 <literal>route=</literal><value>string</value></tag-name>
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277 <tag-desc>
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278 Same as the “<literal>route</literal>” parameter of the
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279 <link doc="ngx_http_upstream_module.xml" id="route">http</link>
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280 upstream server.
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281 </tag-desc>
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282
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283 </list>
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284
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285 The first three parameters select an object.
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286 This can be either the whole http or stream upstream server group,
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287 or a specific server.
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288 Without other parameters, the configuration of the selected
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289 group or server is shown.
953
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290 </para>
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291
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292 <para>
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293 For example, to view the configuration of the whole group, send:
953
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294 <example>
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295 http://127.0.0.1/upstream_conf?upstream=backend
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296 </example>
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297
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298 To view the configuration of a specific server, also specify its ID:
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299 <example>
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300 http://127.0.0.1/upstream_conf?upstream=backend&amp;id=42
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301 </example>
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302 </para>
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303
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304 <para>
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305 To add a new server,
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306 specify its address in the “<literal>server=</literal>” parameter.
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307 Without other parameters specified, a server will be added with other
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308 parameters set to their default values (see the
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309 <link doc="ngx_http_upstream_module.xml" id="server">http</link>
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310 or
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311 <link doc="../stream/ngx_stream_upstream_module.xml" id="server">stream</link>
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312 “<literal>server</literal>” directive).
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313 </para>
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314
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315 <para>
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316 For example, to add a new primary server, send:
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317 <example>
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318 http://127.0.0.1/upstream_conf?add=&amp;upstream=backend&amp;server=127.0.0.1:8080
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319 </example>
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320
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321 To add a new backup server, send:
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322 <example>
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323 http://127.0.0.1/upstream_conf?add=&amp;upstream=backend&amp;backup=&amp;server=127.0.0.1:8080
953
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324 </example>
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325
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326 To add a new primary server,
953
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327 set its parameters to non-default values
968
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Vladimir Homutov <vl@nginx.com>
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328 and mark it as “<literal>down</literal>”, send:
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329 <example>
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330 http://127.0.0.1/upstream_conf?add=&amp;upstream=backend&amp;server=127.0.0.1:8080&amp;weight=2&amp;down=
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331 </example>
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332
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333 To remove a server, specify its ID:
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334 <example>
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335 http://127.0.0.1/upstream_conf?remove=&amp;upstream=backend&amp;id=42
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336 </example>
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337
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338 To mark an existing server as “<literal>down</literal>”, send:
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339 <example>
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340 http://127.0.0.1/upstream_conf?upstream=backend&amp;id=42&amp;down=
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341 </example>
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342
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343 To modify the address of an existing server, send:
953
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344 <example>
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345 http://127.0.0.1/upstream_conf?upstream=backend&amp;id=42&amp;server=192.0.2.3:8123
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346 </example>
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347
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348 To modify other parameters of an existing server, send:
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349 <example>
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350 http://127.0.0.1/upstream_conf?upstream=backend&amp;id=42&amp;max_fails=3&amp;weight=4
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351 </example>
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352
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353 The above examples are for an
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354 <link doc="ngx_http_upstream_module.xml">http</link>
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355 upstream server group.
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356 Similar examples for a
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357 <link doc="../stream/ngx_stream_upstream_module.xml">stream</link>
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358 upstream server group require the “<literal>stream=</literal>” parameter.
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359 </para>
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360
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361 </directive>
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362
293
34246e706f48 English translation of the ngx_http_upstream_module documentation.
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363 </section>
34246e706f48 English translation of the ngx_http_upstream_module documentation.
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364
34246e706f48 English translation of the ngx_http_upstream_module documentation.
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365 </module>