Mercurial > hg > nginx-site
annotate xml/en/docs/http/ngx_http_upstream_conf_module.xml @ 1455:27430ebb4123
Donor added.
author | Maxim Konovalov <maxim@nginx.com> |
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date | Sat, 18 Apr 2015 16:42:30 +0000 |
parents | f5b5eefc43cb |
children | d3c1a4e8c1fe |
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" |
589 | 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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28 |
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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&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=&upstream=backend&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=&upstream=backend&backup=&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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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=&upstream=backend&server=127.0.0.1:8080&weight=2&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=&upstream=backend&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&id=42&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&id=42&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&id=42&max_fails=3&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 |
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348 </section> |
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349 |
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350 </module> |