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annotate xml/en/docs/stream/ngx_stream_core_module.xml @ 1546:8ea1813272bb

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Documented the tcp_nodelay directive for stream.
author Yaroslav Zhuravlev <yar@nginx.com>
date Tue, 11 Aug 2015 18:26:37 +0300
parents 3ae5301ea37a
children 48615cf80e20
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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="10">
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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 events {
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36 worker_connections 1024;
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37 }
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38
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39 stream {
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40 upstream backend {
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41 hash $remote_addr consistent;
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42
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43 server backend1.example.com:12345 weight=5;
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44 server 127.0.0.1:12345 max_fails=3 fail_timeout=30s;
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45 server unix:/tmp/backend3;
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46 }
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47
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48 server {
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49 listen 12345;
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50 proxy_connect_timeout 1s;
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51 proxy_timeout 3s;
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52 proxy_pass backend;
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53 }
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54
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55 server {
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56 listen [::1]:12345;
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57 proxy_pass unix:/tmp/stream.socket;
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58 }
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59 }
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60 </example>
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61 </para>
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62
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63 </section>
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64
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65
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66 <section id="directives" name="Directives">
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67
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68 <directive name="listen">
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69 <syntax>
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70 <value>address</value>:<value>port</value>
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71 [<literal>ssl</literal>]
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72 [<literal>backlog</literal>=<value>number</value>]
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73 [<literal>bind</literal>]
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74 [<literal>ipv6only</literal>=<literal>on</literal>|<literal>off</literal>]
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75 [<literal>reuseport</literal>]
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76 [<literal>so_keepalive</literal>=<literal>on</literal>|<literal>off</literal>|[<value>keepidle</value>]:[<value>keepintvl</value>]:[<value>keepcnt</value>]]</syntax>
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77 <default/>
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78 <context>server</context>
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79
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80 <para>
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81 Sets the <value>address</value> and <value>port</value> for the socket
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82 on which the server will accept connections.
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83 It is possible to specify just the port.
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84 The address can also be a hostname, for example:
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85 <example>
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86 listen 127.0.0.1:12345;
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87 listen *:12345;
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88 listen 12345; # same as *:12345
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89 listen localhost:12345;
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90 </example>
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91 IPv6 addresses are specified in square brackets:
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92 <example>
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93 listen [::1]:12345;
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94 listen [::]:12345;
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95 </example>
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96 UNIX-domain sockets are specified with the “<literal>unix:</literal>”
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97 prefix:
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98 <example>
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99 listen unix:/var/run/nginx.sock;
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100 </example>
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101
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102 </para>
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103
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104 <para>
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105 The <literal>ssl</literal> parameter allows specifying that all
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106 connections accepted on this port should work in SSL mode.
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107 </para>
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108
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109 <para>
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110 The <literal>listen</literal> directive
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111 can have several additional parameters specific to socket-related system calls.
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112 <list type="tag">
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113
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114 <tag-name>
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115 <literal>backlog</literal>=<value>number</value>
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116 </tag-name>
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117 <tag-desc>
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118 sets the <literal>backlog</literal> parameter in the
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119 <c-func>listen</c-func> call that limits
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120 the maximum length for the queue of pending connections (1.9.2).
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121 By default,
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122 <literal>backlog</literal> is set to -1 on FreeBSD, DragonFly BSD, and Mac OS X,
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123 and to 511 on other platforms.
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124 </tag-desc>
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125
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126 <tag-name>
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127 <literal>bind</literal>
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128 </tag-name>
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129 <tag-desc>
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130 this parameter instructs to make a separate <c-func>bind</c-func>
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131 call for a given address:port pair.
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132 The fact is that if there are several <literal>listen</literal> directives with
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133 the same port but different addresses, and one of the
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134 <literal>listen</literal> directives listens on all addresses
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135 for the given port (<literal>*:</literal><value>port</value>), nginx will
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136 <c-func>bind</c-func> only to <literal>*:</literal><value>port</value>.
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137 It should be noted that the <c-func>getsockname</c-func> system call will be
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138 made in this case to determine the address that accepted the connection.
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139 If the <literal>ipv6only</literal>
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140 or <literal>so_keepalive</literal> parameters
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141 are used then for a given
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142 <value>address</value>:<value>port</value> pair
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143 a separate <c-func>bind</c-func> call will always be made.
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144 </tag-desc>
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145
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146 <tag-name>
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147 <literal>ipv6only</literal>=<literal>on</literal>|<literal>off</literal>
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148 </tag-name>
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149 <tag-desc>
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150 this parameter determines
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151 (via the <c-def>IPV6_V6ONLY</c-def> socket option)
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152 whether an IPv6 socket listening on a wildcard address <literal>[::]</literal>
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153 will accept only IPv6 connections or both IPv6 and IPv4 connections.
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154 This parameter is turned on by default.
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155 It can only be set once on start.
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156 </tag-desc>
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157
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158 <tag-name id="reuseport">
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159 <literal>reuseport</literal>
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160 </tag-name>
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161 <tag-desc>
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162 this parameter (1.9.1) instructs to create an individual listening socket
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163 for each worker process
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164 (using the <c-def>SO_REUSEPORT</c-def> socket option), allowing a kernel
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165 to distribute incoming connections between worker processes.
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166 This currently works only on Linux 3.9+ and DragonFly BSD.
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167 <note>
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168 Inappropriate use of this option may have its security
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169 <link url="http://man7.org/linux/man-pages/man7/socket.7.html">implications</link>.
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170 </note>
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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>so_keepalive</literal>=<literal>on</literal>|<literal>off</literal>|[<value>keepidle</value>]:[<value>keepintvl</value>]:[<value>keepcnt</value>]
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175 </tag-name>
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176 <tag-desc>
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177 this parameter configures the “TCP keepalive” behavior
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178 for the listening socket.
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179 If this parameter is omitted then the operating system’s settings will be
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180 in effect for the socket.
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181 If it is set to the value “<literal>on</literal>”, the
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182 <c-def>SO_KEEPALIVE</c-def> option is turned on for the socket.
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183 If it is set to the value “<literal>off</literal>”, the
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184 <c-def>SO_KEEPALIVE</c-def> option is turned off for the socket.
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185 Some operating systems support setting of TCP keepalive parameters on
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186 a per-socket basis using the <c-def>TCP_KEEPIDLE</c-def>,
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187 <c-def>TCP_KEEPINTVL</c-def>, and <c-def>TCP_KEEPCNT</c-def> socket options.
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188 On such systems (currently, Linux 2.4+, NetBSD 5+, and
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189 FreeBSD 9.0-STABLE), they can be configured
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190 using the <value>keepidle</value>, <value>keepintvl</value>, and
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191 <value>keepcnt</value> parameters.
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192 One or two parameters may be omitted, in which case the system default setting
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193 for the corresponding socket option will be in effect.
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194 For example,
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195 <example>so_keepalive=30m::10</example>
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196 will set the idle timeout (<c-def>TCP_KEEPIDLE</c-def>) to 30 minutes,
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197 leave the probe interval (<c-def>TCP_KEEPINTVL</c-def>) at its system default,
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198 and set the probes count (<c-def>TCP_KEEPCNT</c-def>) to 10 probes.
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199 </tag-desc>
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200
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201 </list>
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202 </para>
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203
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204 <para>
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205 Different servers must listen on different
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206 <value>address</value>:<value>port</value> pairs.
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207 </para>
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208
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209 </directive>
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210
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211
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212 <directive name="resolver">
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213 <syntax>
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214 <value>address</value> ...
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215 [<literal>valid</literal>=<value>time</value>]
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216 [<literal>ipv6</literal>=<literal>on</literal>|<literal>off</literal>]</syntax>
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217 <default/>
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218 <context>stream</context>
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219 <context>server</context>
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220
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221 <para>
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222 Configures name servers used to resolve names of upstream servers
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223 into addresses, for example:
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224 <example>
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225 resolver 127.0.0.1 [::1]:5353;
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226 </example>
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227 An address can be specified as a domain name or IP address,
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228 and an optional port.
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229 If port is not specified, the port 53 is used.
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230 Name servers are queried in a round-robin fashion.
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231 </para>
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232
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233 <para>
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234 By default, nginx will look up both IPv4 and IPv6 addresses while resolving.
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235 If looking up of IPv6 addresses is not desired,
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236 the <literal>ipv6=off</literal> parameter can be specified.
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237 </para>
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238
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239 <para>
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240 By default, nginx caches answers using the TTL value of a response.
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241 The optional <literal>valid</literal> parameter allows overriding it:
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242 <example>
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243 resolver 127.0.0.1 [::1]:5353 valid=30s;
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244 </example>
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245 <note>
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246 This directive is available as part of our
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247 <commercial_version>commercial subscription</commercial_version>.
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248 </note>
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249 </para>
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250
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251 </directive>
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252
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253
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254 <directive name="resolver_timeout">
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255 <syntax><value>time</value></syntax>
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256 <default>30s</default>
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257 <context>stream</context>
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258 <context>server</context>
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259
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260 <para>
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261 Sets a timeout for name resolution, for example:
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262 <example>
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263 resolver_timeout 5s;
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264 </example>
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265 <note>
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266 This directive is available as part of our
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267 <commercial_version>commercial subscription</commercial_version>.
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268 </note>
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269 </para>
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270
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271 </directive>
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272
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273
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274 <directive name="server">
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275 <syntax block="yes"/>
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276 <default/>
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277 <context>stream</context>
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278
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279 <para>
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280 Sets the configuration for a server.
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281 </para>
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282
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283 </directive>
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284
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285
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286 <directive name="stream">
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287 <syntax block="yes"/>
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288 <default/>
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289 <context>main</context>
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290
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291 <para>
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292 Provides the configuration file context in which the stream server directives
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293 are specified.
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294 </para>
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295
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296 </directive>
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297
1546
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298
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299 <directive name="tcp_nodelay">
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300 <syntax><literal>on</literal> | <literal>off</literal></syntax>
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301 <default>on</default>
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302 <context>stream</context>
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303 <context>server</context>
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304 <appeared-in>1.9.4</appeared-in>
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305
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306 <para>
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307 Enables or disables the use of the <c-def>TCP_NODELAY</c-def> option.
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308 The option is enabled for both client and proxied server connections.
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309 </para>
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310
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311 </directive>
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312
1367
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313 </section>
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314
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315 </module>