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annotate xml/en/docs/stream/ngx_stream_core_module.xml @ 1507:14180fa9a518

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Added ids for reuseport, mentioned reuseport in news.
author Yaroslav Zhuravlev <yar@nginx.com>
date Thu, 11 Jun 2015 21:22:52 +0300
parents b628e042a15e
children 3ae5301ea37a
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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="8">
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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>backlog</literal>=<value>number</value>]
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69 [<literal>bind</literal>]
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70 [<literal>ipv6only</literal>=<literal>on</literal>|<literal>off</literal>]
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71 [<literal>reuseport</literal>]
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72 [<literal>so_keepalive</literal>=<literal>on</literal>|<literal>off</literal>|[<value>keepidle</value>]:[<value>keepintvl</value>]:[<value>keepcnt</value>]]</syntax>
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73 <default/>
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74 <context>server</context>
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75
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76 <para>
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77 Sets the <value>address</value> and <value>port</value> for the socket
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78 on which the server will accept connections.
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79 It is possible to specify just the port.
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80 The address can also be a hostname, for example:
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81 <example>
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82 listen 127.0.0.1:12345;
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83 listen *:12345;
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84 listen 12345; # same as *:12345
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85 listen localhost:12345;
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86 </example>
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87 IPv6 addresses are specified in square brackets:
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88 <example>
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89 listen [::1]:12345;
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90 listen [::]:12345;
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91 </example>
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92 UNIX-domain sockets are specified with the “<literal>unix:</literal>”
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93 prefix:
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94 <example>
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95 listen unix:/var/run/nginx.sock;
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96 </example>
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97
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98 </para>
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99
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100 <para>
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101 The <literal>ssl</literal> parameter allows specifying that all
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102 connections accepted on this port should work in SSL mode.
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103 </para>
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104
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105 <para>
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106 The <literal>listen</literal> directive
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107 can have several additional parameters specific to socket-related system calls.
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108 <list type="tag">
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109
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110 <tag-name>
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111 <literal>backlog</literal>=<value>number</value>
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112 </tag-name>
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113 <tag-desc>
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114 sets the <literal>backlog</literal> parameter in the
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115 <c-func>listen</c-func> call that limits
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116 the maximum length for the queue of pending connections (1.9.2).
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117 By default,
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118 <literal>backlog</literal> is set to -1 on FreeBSD, DragonFly BSD, and Mac OS X,
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119 and to 511 on other platforms.
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120 </tag-desc>
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121
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122 <tag-name>
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123 <literal>bind</literal>
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124 </tag-name>
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125 <tag-desc>
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126 this parameter instructs to make a separate <c-func>bind</c-func>
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127 call for a given address:port pair.
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128 The fact is that if there are several <literal>listen</literal> directives with
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129 the same port but different addresses, and one of the
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130 <literal>listen</literal> directives listens on all addresses
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131 for the given port (<literal>*:</literal><value>port</value>), nginx will
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132 <c-func>bind</c-func> only to <literal>*:</literal><value>port</value>.
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133 It should be noted that the <c-func>getsockname</c-func> system call will be
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134 made in this case to determine the address that accepted the connection.
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135 If the <literal>ipv6only</literal>
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136 or <literal>so_keepalive</literal> parameters
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137 are used then for a given
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138 <value>address</value>:<value>port</value> pair
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139 a separate <c-func>bind</c-func> call will always be made.
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140 </tag-desc>
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141
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142 <tag-name>
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143 <literal>ipv6only</literal>=<literal>on</literal>|<literal>off</literal>
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144 </tag-name>
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145 <tag-desc>
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146 this parameter determines
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147 (via the <c-def>IPV6_V6ONLY</c-def> socket option)
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148 whether an IPv6 socket listening on a wildcard address <literal>[::]</literal>
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149 will accept only IPv6 connections or both IPv6 and IPv4 connections.
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150 This parameter is turned on by default.
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151 It can only be set once on start.
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152 </tag-desc>
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153
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154 <tag-name id="reuseport">
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155 <literal>reuseport</literal>
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156 </tag-name>
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157 <tag-desc>
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158 this parameter (1.9.1) instructs to create an individual listening socket
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159 for each worker process
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160 (using the <c-def>SO_REUSEPORT</c-def> socket option), allowing a kernel
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161 to distribute incoming connections between worker processes.
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162 This currently works only on Linux 3.9+ and DragonFly BSD.
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163 <note>
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164 Inappropriate use of this option may have its security
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165 <link url="http://man7.org/linux/man-pages/man7/socket.7.html">implications</link>.
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166 </note>
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167 </tag-desc>
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168
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169 <tag-name>
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170 <literal>so_keepalive</literal>=<literal>on</literal>|<literal>off</literal>|[<value>keepidle</value>]:[<value>keepintvl</value>]:[<value>keepcnt</value>]
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171 </tag-name>
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172 <tag-desc>
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173 this parameter configures the “TCP keepalive” behavior
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174 for the listening socket.
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175 If this parameter is omitted then the operating system’s settings will be
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176 in effect for the socket.
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177 If it is set to the value “<literal>on</literal>”, the
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178 <c-def>SO_KEEPALIVE</c-def> option is turned on for the socket.
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179 If it is set to the value “<literal>off</literal>”, the
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180 <c-def>SO_KEEPALIVE</c-def> option is turned off for the socket.
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181 Some operating systems support setting of TCP keepalive parameters on
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182 a per-socket basis using the <c-def>TCP_KEEPIDLE</c-def>,
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183 <c-def>TCP_KEEPINTVL</c-def>, and <c-def>TCP_KEEPCNT</c-def> socket options.
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184 On such systems (currently, Linux 2.4+, NetBSD 5+, and
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185 FreeBSD 9.0-STABLE), they can be configured
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186 using the <value>keepidle</value>, <value>keepintvl</value>, and
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187 <value>keepcnt</value> parameters.
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188 One or two parameters may be omitted, in which case the system default setting
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189 for the corresponding socket option will be in effect.
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190 For example,
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191 <example>so_keepalive=30m::10</example>
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192 will set the idle timeout (<c-def>TCP_KEEPIDLE</c-def>) to 30 minutes,
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193 leave the probe interval (<c-def>TCP_KEEPINTVL</c-def>) at its system default,
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194 and set the probes count (<c-def>TCP_KEEPCNT</c-def>) to 10 probes.
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195 </tag-desc>
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196
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197 </list>
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198 </para>
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199
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200 <para>
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201 Different servers must listen on different
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202 <value>address</value>:<value>port</value> pairs.
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203 </para>
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204
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205 </directive>
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206
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207
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208 <directive name="resolver">
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209 <syntax>
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210 <value>address</value> ...
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211 [<literal>valid</literal>=<value>time</value>]
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212 [<literal>ipv6</literal>=<literal>on</literal>|<literal>off</literal>]</syntax>
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213 <default/>
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214 <context>stream</context>
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215 <context>server</context>
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216
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217 <para>
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218 Configures name servers used to resolve names of upstream servers
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219 into addresses, for example:
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220 <example>
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221 resolver 127.0.0.1 [::1]:5353;
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222 </example>
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223 An address can be specified as a domain name or IP address,
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224 and an optional port.
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225 If port is not specified, the port 53 is used.
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226 Name servers are queried in a round-robin fashion.
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227 </para>
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228
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229 <para>
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230 By default, nginx will look up both IPv4 and IPv6 addresses while resolving.
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231 If looking up of IPv6 addresses is not desired,
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232 the <literal>ipv6=off</literal> parameter can be specified.
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233 </para>
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234
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235 <para>
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236 By default, nginx caches answers using the TTL value of a response.
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237 The optional <literal>valid</literal> parameter allows overriding it:
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238 <example>
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239 resolver 127.0.0.1 [::1]:5353 valid=30s;
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240 </example>
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241 <note>
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242 This directive is available as part of our
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243 <commercial_version>commercial subscription</commercial_version>.
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244 </note>
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245 </para>
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246
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247 </directive>
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248
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249
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250 <directive name="resolver_timeout">
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251 <syntax><value>time</value></syntax>
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252 <default>30s</default>
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253 <context>stream</context>
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254 <context>server</context>
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255
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256 <para>
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257 Sets a timeout for name resolution, for example:
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258 <example>
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259 resolver_timeout 5s;
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260 </example>
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261 <note>
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262 This directive is available as part of our
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263 <commercial_version>commercial subscription</commercial_version>.
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264 </note>
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265 </para>
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266
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267 </directive>
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268
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269
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270 <directive name="server">
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271 <syntax block="yes"/>
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272 <default/>
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273 <context>stream</context>
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274
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275 <para>
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276 Sets the configuration for a server.
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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
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282 <directive name="stream">
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283 <syntax block="yes"/>
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284 <default/>
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285 <context>main</context>
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286
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287 <para>
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288 Provides the configuration file context in which the stream server directives
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289 are specified.
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290 </para>
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291
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292 </directive>
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293
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294 </section>
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295
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296 </module>