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annotate xml/en/docs/http/ngx_http_upstream_conf_module.xml @ 1450:f5b5eefc43cb

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Updated commercial docs for the upcoming release.
author Ruslan Ermilov <ru@nginx.com>
date Thu, 09 Apr 2015 19:18:54 +0300
parents xml/en/docs/http/ngx_http_upstream_module.xml@410e0683b6b4
children d3c1a4e8c1fe
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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="1">
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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 </para>
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26
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27 </section>
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29
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30 <section id="example" name="Example Configuration">
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31
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32 <para>
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33 <example>
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34 upstream backend {
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35 zone upstream_backend 64k;
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36
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37 ...
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38 }
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39
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40 server {
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41 location /upstream_conf {
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42 <emphasis>upstream_conf</emphasis>;
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43 allow 127.0.0.1;
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44 deny all;
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45 }
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46 }
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47 </example>
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48 </para>
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49
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50 </section>
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51
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52
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53 <section id="directives" name="Directives">
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54
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55 <directive name="upstream_conf">
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56 <syntax/>
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57 <default/>
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58 <context>location</context>
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59
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60 <para>
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61 Turns on the HTTP interface of upstream configuration in the surrounding
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62 location.
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63 Access to this location should be
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64 <link doc="ngx_http_core_module.xml" id="satisfy">limited</link>.
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65 </para>
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66
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67 <para>
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68 Configuration commands can be used to:
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69 <list type="bullet">
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70
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71 <listitem>view the group configuration;</listitem>
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72
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73 <listitem>view, modify, or remove a server;</listitem>
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74
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75 <listitem>add a new server.</listitem>
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76
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77 </list>
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78 <note>
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79 Since addresses in a group are not required to be unique, specific
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80 servers in a group are referenced by their IDs.
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81 IDs are assigned automatically and shown when adding a new server
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82 or viewing the group configuration.
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83 </note>
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84 </para>
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85
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86 <para>
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87 A configuration command consists of parameters passed as request arguments,
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88 for example:
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89 <example>
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90 http://127.0.0.1/upstream_conf?upstream=backend
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91 </example>
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92 </para>
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93
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94 <para>
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95 The following parameters are supported:
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96
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97 <list type="tag" compact="no">
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98
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99 <tag-name>
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100 <literal>stream=</literal></tag-name>
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101 <tag-desc>
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102 Selects a
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103 <link doc="../stream/ngx_stream_upstream_module.xml">stream</link>
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104 upstream server group.
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105 Without this parameter, selects an
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106 <link doc="ngx_http_upstream_module.xml">http</link>
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107 upstream server group.
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108 </tag-desc>
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109
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110 <tag-name>
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111 <literal>upstream=</literal><value>name</value></tag-name>
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112 <tag-desc>
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113 Selects a group to work with.
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114 This parameter is mandatory.
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115 </tag-desc>
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116
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117 <tag-name>
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118 <literal>id=</literal><value>number</value></tag-name>
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119 <tag-desc>
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120 Selects a server for viewing, modifying, or removing.
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121 </tag-desc>
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122
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123 <tag-name>
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124 <literal>remove=</literal></tag-name>
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125 <tag-desc>
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126 Removes a server from the group.
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127 </tag-desc>
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128
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129 <tag-name>
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130 <literal>add=</literal></tag-name>
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131 <tag-desc>
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132 Adds a new server to the group.
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133 </tag-desc>
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134
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135 <tag-name>
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136 <literal>backup=</literal></tag-name>
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137 <tag-desc>
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138 Required to add a backup server.
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139 <note>
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140 Before version 1.7.2, <literal>backup=</literal>
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141 was also required to view, modify, or remove existing backup servers.
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142 </note>
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143 </tag-desc>
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144
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145 <tag-name>
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146 <literal>server=</literal><value>address</value></tag-name>
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147 <tag-desc>
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148 Same as the “<literal>address</literal>” parameter
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149 of the
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150 <link doc="ngx_http_upstream_module.xml" id="server">http</link>
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151 or
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152 <link doc="../stream/ngx_stream_upstream_module.xml" id="server">stream</link>
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153 upstream server.
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154 <para>
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155 When adding a server, it is possible to specify it as a domain name.
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156 In this case, changes of the IP addresses that correspond to a domain name
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157 will be monitored and automatically applied to the upstream
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158 configuration without the need of restarting nginx (1.7.2).
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159 This requires the “<literal>resolver</literal>” directive in the
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160 <link doc="ngx_http_core_module.xml" id="resolver">http</link>
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161 or
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162 <link doc="../stream/ngx_stream_core_module.xml" id="resolver">stream</link>
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163 block.
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164 See also the “<literal>resolve</literal>” parameter
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165 of the
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166 <link doc="ngx_http_upstream_module.xml" id="resolve">http</link>
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167 or
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168 <link doc="../stream/ngx_stream_upstream_module.xml" id="resolve">stream</link>
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169 upstream server.
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170 </para>
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171 </tag-desc>
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172
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173 <tag-name>
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174 <literal>weight=</literal><value>number</value></tag-name>
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175 <tag-desc>
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176 Same as the “<literal>weight</literal>” parameter
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177 of the
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178 <link doc="ngx_http_upstream_module.xml" id="weight">http</link>
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179 or
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180 <link doc="../stream/ngx_stream_upstream_module.xml" id="weight">stream</link>
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181 upstream server.
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182 </tag-desc>
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183
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184 <tag-name>
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185 <literal>max_conns=</literal><value>number</value></tag-name>
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186 <tag-desc>
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187 Same as the “<literal>max_conns</literal>” parameter
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188 of the
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189 <link doc="ngx_http_upstream_module.xml" id="max_conns">http</link>
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190 or
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191 <link doc="../stream/ngx_stream_upstream_module.xml" id="max_conns">stream</link>
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192 upstream server.
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193 </tag-desc>
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194
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195 <tag-name>
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196 <literal>max_fails=</literal><value>number</value></tag-name>
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197 <tag-desc>
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198 Same as the “<literal>max_fails</literal>” parameter
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199 of the
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200 <link doc="ngx_http_upstream_module.xml" id="max_fails">http</link>
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201 or
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202 <link doc="../stream/ngx_stream_upstream_module.xml" id="max_fails">stream</link>
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203 upstream server.
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204 </tag-desc>
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205
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206 <tag-name>
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207 <literal>fail_timeout=</literal><value>time</value></tag-name>
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208 <tag-desc>
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209 Same as the “<literal>fail_timeout</literal>” parameter
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210 of the
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211 <link doc="ngx_http_upstream_module.xml" id="fail_timeout">http</link>
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212 or
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213 <link doc="../stream/ngx_stream_upstream_module.xml" id="fail_timeout">stream</link>
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214 upstream server.
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215 </tag-desc>
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216
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217 <tag-name>
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218 <literal>slow_start=</literal><value>time</value></tag-name>
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219 <tag-desc>
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220 Same as the “<literal>slow_start</literal>” parameter
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221 of the
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222 <link doc="ngx_http_upstream_module.xml" id="slow_start">http</link>
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223 or
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224 <link doc="../stream/ngx_stream_upstream_module.xml" id="slow_start">stream</link>
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225 upstream server.
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226 </tag-desc>
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227
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228 <tag-name>
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229 <literal>down=</literal></tag-name>
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230 <tag-desc>
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231 Same as the “<literal>down</literal>” parameter
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232 of the
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233 <link doc="ngx_http_upstream_module.xml" id="down">http</link>
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234 or
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235 <link doc="../stream/ngx_stream_upstream_module.xml" id="down">stream</link>
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236 upstream server.
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237 </tag-desc>
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238
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239 <tag-name id="drain"><literal>drain=</literal></tag-name>
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240 <tag-desc>
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241 Puts the
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242 <link doc="ngx_http_upstream_module.xml">http</link>
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243 upstream server in the “draining” mode (1.7.5).
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244 In this mode, only requests of the
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245 <link doc="ngx_http_upstream_module.xml" id="sticky">bound</link> to the server
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246 will be proxied to it.
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247 </tag-desc>
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248
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249 <tag-name>
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250 <literal>up=</literal></tag-name>
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251 <tag-desc>
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252 The opposite of the “<literal>down</literal>” parameter
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253 of the
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254 <link doc="ngx_http_upstream_module.xml" id="down">http</link>
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255 or
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256 <link doc="../stream/ngx_stream_upstream_module.xml" id="down">stream</link>
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257 upstream server.
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258 </tag-desc>
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259
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260 <tag-name>
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261 <literal>route=</literal><value>string</value></tag-name>
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262 <tag-desc>
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263 Same as the “<literal>route</literal>” parameter of the
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264 <link doc="ngx_http_upstream_module.xml" id="route">http</link>
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265 upstream server.
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266 </tag-desc>
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267
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268 </list>
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269
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270 The first three parameters select an object.
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271 This can be either the whole http or stream upstream server group,
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272 or a specific server.
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273 Without other parameters, the configuration of the selected
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274 group or server is shown.
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275 </para>
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276
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277 <para>
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278 For example, to view the configuration of the whole group, send:
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279 <example>
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280 http://127.0.0.1/upstream_conf?upstream=backend
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281 </example>
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282
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283 To view the configuration of a specific server, also specify its ID:
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284 <example>
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285 http://127.0.0.1/upstream_conf?upstream=backend&amp;id=42
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286 </example>
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287 </para>
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288
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289 <para>
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290 To add a new server,
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291 specify its address in the “<literal>server=</literal>” parameter.
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292 Without other parameters specified, a server will be added with other
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293 parameters set to their default values (see the
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294 <link doc="ngx_http_upstream_module.xml" id="server">http</link>
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295 or
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296 <link doc="../stream/ngx_stream_upstream_module.xml" id="server">stream</link>
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297 “<literal>server</literal>” directive).
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298 </para>
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299
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300 <para>
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301 For example, to add a new primary server, send:
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302 <example>
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303 http://127.0.0.1/upstream_conf?add=&amp;upstream=backend&amp;server=127.0.0.1:8080
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304 </example>
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305
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306 To add a new backup server, send:
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307 <example>
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308 http://127.0.0.1/upstream_conf?add=&amp;upstream=backend&amp;backup=&amp;server=127.0.0.1:8080
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309 </example>
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310
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311 To add a new primary server,
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312 set its parameters to non-default values
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Vladimir Homutov <vl@nginx.com>
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313 and mark it as “<literal>down</literal>”, send:
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314 <example>
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315 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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316 </example>
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317
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318 To remove a server, specify its ID:
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319 <example>
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320 http://127.0.0.1/upstream_conf?remove=&amp;upstream=backend&amp;id=42
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321 </example>
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322
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323 To mark an existing server as “<literal>down</literal>”, send:
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324 <example>
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325 http://127.0.0.1/upstream_conf?upstream=backend&amp;id=42&amp;down=
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326 </example>
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327
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328 To modify the address of an existing server, send:
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329 <example>
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330 http://127.0.0.1/upstream_conf?upstream=backend&amp;id=42&amp;server=192.0.2.3:8123
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331 </example>
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332
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333 To modify other parameters of an existing server, send:
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334 <example>
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335 http://127.0.0.1/upstream_conf?upstream=backend&amp;id=42&amp;max_fails=3&amp;weight=4
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336 </example>
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337
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338 The above examples are for an
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339 <link doc="ngx_http_upstream_module.xml">http</link>
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340 upstream server group.
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341 Similar examples for a
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342 <link doc="../stream/ngx_stream_upstream_module.xml">stream</link>
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343 upstream server group require the “<literal>stream=</literal>” parameter.
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344 </para>
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345
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346 </directive>
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347
293
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348 </section>
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349
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350 </module>