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annotate xml/en/docs/stream/ngx_stream_core_module.xml @ 1500:cd534da03d02

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Added Linux kernel version in reuseport.
author Yaroslav Zhuravlev <yar@nginx.com>
date Wed, 03 Jun 2015 14:00:37 +0300
parents 99ce48c8cce3
children b628e042a15e
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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_stream_core_module"
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10 link="/en/docs/stream/ngx_stream_core_module.html"
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11 lang="en"
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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_stream_core_module</literal> module
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18 is available since version 1.9.0.
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19 This module is not built by default, it should be enabled with the
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20 <literal>--with-stream</literal>
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21 configuration parameter.
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22 </para>
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23
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24 </section>
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25
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26
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27 <section id="example" name="Example Configuration">
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28
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29 <para>
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30 <example>
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31 worker_processes auto;
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32
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33 error_log /var/log/nginx/error.log info;
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34
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35 stream {
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36 upstream backend {
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37 hash $remote_addr consistent;
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38
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39 server backend1.example.com:12345 weight=5;
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40 server 127.0.0.1:12345 max_fails=3 fail_timeout=30s;
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41 server unix:/tmp/backend3;
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42 }
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43
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44 server {
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45 listen 12345;
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46 proxy_connect_timeout 1s;
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47 proxy_timeout 3s;
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48 proxy_pass backend;
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49 }
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50
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51 server {
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52 listen [::1]:12345;
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53 proxy_pass unix:/tmp/stream.socket;
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54 }
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55 }
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56 </example>
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57 </para>
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58
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59 </section>
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60
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61
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62 <section id="directives" name="Directives">
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63
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64 <directive name="listen">
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65 <syntax>
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66 <value>address</value>:<value>port</value>
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67 [<literal>ssl</literal>]
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68 [<literal>bind</literal>]
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69 [<literal>ipv6only</literal>=<literal>on</literal>|<literal>off</literal>]
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70 [<literal>reuseport</literal>]
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71 [<literal>so_keepalive</literal>=<literal>on</literal>|<literal>off</literal>|[<value>keepidle</value>]:[<value>keepintvl</value>]:[<value>keepcnt</value>]]</syntax>
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72 <default/>
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73 <context>server</context>
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74
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75 <para>
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76 Sets the <value>address</value> and <value>port</value> for the socket
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77 on which the server will accept connections.
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78 It is possible to specify just the port.
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79 The address can also be a hostname, for example:
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80 <example>
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81 listen 127.0.0.1:12345;
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82 listen *:12345;
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83 listen 12345; # same as *:12345
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84 listen localhost:12345;
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85 </example>
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86 IPv6 addresses are specified in square brackets:
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87 <example>
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88 listen [::1]:12345;
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89 listen [::]:12345;
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90 </example>
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91 UNIX-domain sockets are specified with the “<literal>unix:</literal>”
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92 prefix:
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93 <example>
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94 listen unix:/var/run/nginx.sock;
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95 </example>
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96
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97 </para>
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98
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99 <para>
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100 The <literal>ssl</literal> parameter allows specifying that all
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101 connections accepted on this port should work in SSL mode.
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102 </para>
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103
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104 <para>
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105 The <literal>listen</literal> directive
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106 can have several additional parameters specific to socket-related system calls.
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107 <list type="tag">
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108
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109 <tag-name>
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110 <literal>bind</literal>
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111 </tag-name>
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112 <tag-desc>
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113 this parameter instructs to make a separate <c-func>bind</c-func>
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114 call for a given address:port pair.
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115 The fact is that if there are several <literal>listen</literal> directives with
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116 the same port but different addresses, and one of the
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117 <literal>listen</literal> directives listens on all addresses
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118 for the given port (<literal>*:</literal><value>port</value>), nginx will
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119 <c-func>bind</c-func> only to <literal>*:</literal><value>port</value>.
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120 It should be noted that the <c-func>getsockname</c-func> system call will be
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121 made in this case to determine the address that accepted the connection.
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122 If the <literal>ipv6only</literal>
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123 or <literal>so_keepalive</literal> parameters
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124 are used then for a given
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125 <value>address</value>:<value>port</value> pair
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126 a separate <c-func>bind</c-func> call will always be made.
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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>ipv6only</literal>=<literal>on</literal>|<literal>off</literal>
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131 </tag-name>
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132 <tag-desc>
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133 this parameter determines
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134 (via the <c-def>IPV6_V6ONLY</c-def> socket option)
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135 whether an IPv6 socket listening on a wildcard address <literal>[::]</literal>
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136 will accept only IPv6 connections or both IPv6 and IPv4 connections.
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137 This parameter is turned on by default.
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138 It can only be set once on start.
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139 </tag-desc>
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140
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141 <tag-name>
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142 <literal>reuseport</literal>
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143 </tag-name>
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144 <tag-desc>
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145 this parameter (1.9.1) instructs to create an individual listening socket
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146 for each worker process
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147 (using the <c-def>SO_REUSEPORT</c-def> socket option), allowing a kernel
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148 to distribute incoming connections between worker processes.
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149 This currently works only on Linux 3.9+ and DragonFly BSD.
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150 <note>
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151 Inappropriate use of this option may have its security
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152 <link url="http://man7.org/linux/man-pages/man7/socket.7.html">implications</link>.
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153 </note>
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154 </tag-desc>
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155
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156 <tag-name>
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157 <literal>so_keepalive</literal>=<literal>on</literal>|<literal>off</literal>|[<value>keepidle</value>]:[<value>keepintvl</value>]:[<value>keepcnt</value>]
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158 </tag-name>
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159 <tag-desc>
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160 this parameter configures the “TCP keepalive” behavior
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161 for the listening socket.
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162 If this parameter is omitted then the operating system’s settings will be
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163 in effect for the socket.
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164 If it is set to the value “<literal>on</literal>”, the
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165 <c-def>SO_KEEPALIVE</c-def> option is turned on for the socket.
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166 If it is set to the value “<literal>off</literal>”, the
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167 <c-def>SO_KEEPALIVE</c-def> option is turned off for the socket.
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168 Some operating systems support setting of TCP keepalive parameters on
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169 a per-socket basis using the <c-def>TCP_KEEPIDLE</c-def>,
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170 <c-def>TCP_KEEPINTVL</c-def>, and <c-def>TCP_KEEPCNT</c-def> socket options.
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171 On such systems (currently, Linux 2.4+, NetBSD 5+, and
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172 FreeBSD 9.0-STABLE), they can be configured
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173 using the <value>keepidle</value>, <value>keepintvl</value>, and
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174 <value>keepcnt</value> parameters.
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175 One or two parameters may be omitted, in which case the system default setting
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176 for the corresponding socket option will be in effect.
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177 For example,
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178 <example>so_keepalive=30m::10</example>
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179 will set the idle timeout (<c-def>TCP_KEEPIDLE</c-def>) to 30 minutes,
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180 leave the probe interval (<c-def>TCP_KEEPINTVL</c-def>) at its system default,
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181 and set the probes count (<c-def>TCP_KEEPCNT</c-def>) to 10 probes.
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182 </tag-desc>
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183
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184 </list>
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185 </para>
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186
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187 <para>
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188 Different servers must listen on different
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189 <value>address</value>:<value>port</value> pairs.
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190 </para>
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191
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192 </directive>
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193
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194
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195 <directive name="resolver">
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196 <syntax>
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197 <value>address</value> ...
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198 [<literal>valid</literal>=<value>time</value>]
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199 [<literal>ipv6</literal>=<literal>on</literal>|<literal>off</literal>]</syntax>
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200 <default/>
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201 <context>stream</context>
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202 <context>server</context>
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203
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204 <para>
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205 Configures name servers used to resolve names of upstream servers
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206 into addresses, for example:
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207 <example>
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208 resolver 127.0.0.1 [::1]:5353;
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209 </example>
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210 An address can be specified as a domain name or IP address,
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211 and an optional port.
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212 If port is not specified, the port 53 is used.
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213 Name servers are queried in a round-robin fashion.
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214 </para>
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215
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216 <para>
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217 By default, nginx will look up both IPv4 and IPv6 addresses while resolving.
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218 If looking up of IPv6 addresses is not desired,
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219 the <literal>ipv6=off</literal> parameter can be specified.
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220 </para>
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221
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222 <para>
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223 By default, nginx caches answers using the TTL value of a response.
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224 The optional <literal>valid</literal> parameter allows overriding it:
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225 <example>
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226 resolver 127.0.0.1 [::1]:5353 valid=30s;
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227 </example>
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228 <note>
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229 This directive is available as part of our
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230 <commercial_version>commercial subscription</commercial_version>.
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231 </note>
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232 </para>
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233
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234 </directive>
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235
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236
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237 <directive name="resolver_timeout">
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238 <syntax><value>time</value></syntax>
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239 <default>30s</default>
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240 <context>stream</context>
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241 <context>server</context>
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242
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243 <para>
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244 Sets a timeout for name resolution, for example:
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245 <example>
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246 resolver_timeout 5s;
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247 </example>
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248 <note>
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249 This directive is available as part of our
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250 <commercial_version>commercial subscription</commercial_version>.
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251 </note>
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252 </para>
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253
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254 </directive>
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255
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256
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257 <directive name="server">
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258 <syntax block="yes"/>
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259 <default/>
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260 <context>stream</context>
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261
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262 <para>
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263 Sets the configuration for a server.
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264 </para>
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265
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266 </directive>
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267
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268
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269 <directive name="stream">
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270 <syntax block="yes"/>
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271 <default/>
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272 <context>main</context>
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273
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274 <para>
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275 Provides the configuration file context in which the stream server directives
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276 are specified.
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277 </para>
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278
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279 </directive>
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280
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281 </section>
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282
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283 </module>