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annotate xml/en/docs/stream/ngx_stream_module.xml @ 1367:f1e14d87d833

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Updated commercial docs for the upcoming release.
author Ruslan Ermilov <ru@nginx.com>
date Mon, 01 Dec 2014 13:40:25 +0300
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children 66f227952864
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1367
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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) 2014 Yaroslav Zhuravlev
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5 Copyright (C) Nginx, Inc.
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6 -->
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7
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8 <!DOCTYPE module SYSTEM "../../../../dtd/module.dtd">
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9
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10 <module name="Module ngx_stream_module"
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11 link="/en/docs/stream/ngx_stream_module.html"
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12 lang="en"
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13 rev="1">
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14
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15 <section id="summary">
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16
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17 <para>
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18 The <literal>stream</literal> module (1.7.7) provides
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19 proxying TCP and UNIX-domain socket connections.
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20 </para>
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21
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22 <para>
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23 <note>
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24 This module is available as part of our
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25 <commercial_version>commercial subscription</commercial_version>.
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26 </note>
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27 </para>
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28
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29 </section>
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30
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31 <section id="example" name="Example Configuration">
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32
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33 <para>
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34 <example>
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35 stream {
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36 upstream backend {
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37 least_conn;
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38 server srv1.example.com:8000;
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39 server srv2.example.com:8000;
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40 server srv3.example.com:8001;
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41 }
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42
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43 server {
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44 listen 9000;
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45 proxy_connect_timeout 1s;
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46 proxy_timeout 3s;
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47 proxy_pass backend;
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48 }
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49 }
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50 </example>
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51 In this example, a server that listens on port 9000
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52 <link doc="ngx_stream_module.xml" id="proxy_pass">proxies</link>
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53 TCP connections to a group of servers named <literal>backend</literal>.
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54 Note that the <link doc="ngx_stream_module.xml" id="proxy_pass"/>
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55 directive defined the context of the <literal>stream</literal> module
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56 must not contain a protocol.
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57 Two optional timeout parameters are specified:
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58 the <link doc="ngx_stream_module.xml" id="proxy_connect_timeout"/> sets
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59 a timeout required for establishing a connection with a server
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60 that belongs to the <literal>backend</literal> group, while the
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61 <link doc="ngx_stream_module.xml" id="proxy_timeout"/> sets
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62 a timeout used after proxying to one of the servers in the
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63 <literal>backend</literal> group had started.
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64 All TCP proxy-related functionality is configured inside the
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65 <link doc="ngx_stream_module.xml" id="stream"/> block
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66 just like the <link doc="../http/ngx_http_core_module.xml" id="http"/> block
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67 for HTTP requests.
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68 </para>
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69
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70 <para>
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71 The <literal>backend</literal> group consists of three physical servers
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72 (<literal>srv1-srv3</literal>).
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73 Each server name follows the obligatory <literal>port</literal> number.
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74 TCP connections are distributed among the servers according to the
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75 <link doc="ngx_stream_upstream_module.xml" id="least_conn">least
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76 connected</link> load balancing method: a connection will go to the server
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77 that has the fewest active connections.
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78 Directives required to configure a group of proxied servers
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79 and load-balancing can be found in the
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80 <link doc="ngx_stream_upstream_module.xml">ngx_stream_upstream_module</link>.
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81 </para>
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82
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83 </section>
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84
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85
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86 <section id="directives" name="Directives">
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87
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88 <directive name="listen">
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89 <syntax>
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90 <value>address</value>:<value>port</value>
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91 [<literal>bind</literal>]
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92 [<literal>ipv6only</literal>=<literal>on</literal>|<literal>off</literal>]
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93 [<literal>so_keepalive</literal>=<literal>on</literal>|<literal>off</literal>|[<value>keepidle</value>]:[<value>keepintvl</value>]:[<value>keepcnt</value>]]</syntax>
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94 <default/>
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95 <context>server</context>
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96
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97 <para>
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98 Sets the <value>address</value> and <value>port</value> for the socket
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99 on which the server will accept connections.
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100 It is possible to specify just the port.
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101 The address can also be a hostname, for example:
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102 <example>
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103 listen 127.0.0.1:110;
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104 listen *:110;
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105 listen 110; # same as *:110
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106 listen localhost:110;
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107 </example>
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108 IPv6 addresses are specified in square brackets:
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109 <example>
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110 listen [::1]:110;
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111 listen [::]:110;
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112 </example>
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113 UNIX-domain sockets are specified with the “<literal>unix:</literal>”
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114 prefix:
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115 <example>
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116 listen unix:/var/run/nginx.sock;
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117 </example>
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118
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119 </para>
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120
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121 <para>
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122 The directive supports the following parameters:
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123
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124 <list type="tag">
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125
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126 <tag-name id="bind">
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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 id="ipv6only">
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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="so_keepalive">
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159 <literal>so_keepalive</literal>=<literal>on</literal>|<literal>off</literal>|[<value>keepidle</value>]:[<value>keepintvl</value>]:[<value>keepcnt</value>]
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160 </tag-name>
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161 <tag-desc>
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162 this parameter configures the “TCP keepalive” behavior
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163 for the listening socket.
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164 If this parameter is omitted then the operating system’s settings will be
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165 in effect for the socket.
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166 If it is set to the value “<literal>on</literal>”, the
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167 <c-def>SO_KEEPALIVE</c-def> option is turned on for the socket.
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168 If it is set to the value “<literal>off</literal>”, the
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169 <c-def>SO_KEEPALIVE</c-def> option is turned off for the socket.
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170 Some operating systems support setting of TCP keepalive parameters on
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171 a per-socket basis using the <c-def>TCP_KEEPIDLE</c-def>,
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172 <c-def>TCP_KEEPINTVL</c-def>, and <c-def>TCP_KEEPCNT</c-def> socket options.
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173 On such systems (currently, Linux 2.4+, NetBSD 5+, and
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174 FreeBSD 9.0-STABLE), they can be configured
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175 using the <value>keepidle</value>, <value>keepintvl</value>, and
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176 <value>keepcnt</value> parameters.
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177 One or two parameters may be omitted, in which case the system default setting
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178 for the corresponding socket option will be in effect.
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179 For example,
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180 <example>so_keepalive=30m::10</example>
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181 will set the idle timeout (<c-def>TCP_KEEPIDLE</c-def>) to 30 minutes,
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182 leave the probe interval (<c-def>TCP_KEEPINTVL</c-def>) at its system default,
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183 and set the probes count (<c-def>TCP_KEEPCNT</c-def>) to 10 probes.
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184 </tag-desc>
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185 </list>
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186 </para>
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187
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188 <para>
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189 Different servers must listen on different
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190 <value>address</value>:<value>port</value> pairs.
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191 </para>
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192
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193 </directive>
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194
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195
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196 <directive name="proxy_connect_timeout">
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197 <syntax><value>time</value></syntax>
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198 <default>60s</default>
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199 <context>stream</context>
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200 <context>server</context>
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201
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202 <para>
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203 Defines a timeout for establishing a connection with a proxied server.
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204 </para>
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205
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206 </directive>
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207
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208
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209 <directive name="proxy_downstream_buffer">
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210 <syntax><value>size</value></syntax>
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211 <default>16k</default>
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212 <context>stream</context>
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213 <context>server</context>
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214
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215 <para>
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216 Sets the <value>size</value> of the
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217 buffers used for reading data from the client.
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218 </para>
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219
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220 </directive>
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221
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222
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223 <directive name="proxy_pass">
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224 <syntax><value>URL</value></syntax>
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225 <default/>
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226 <context>server</context>
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227
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228 <para>
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229 Sets the address of a proxied server or a
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230 <link doc="ngx_stream_upstream_module.xml">server group</link>.
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231 The address can be specified as a domain name or IP address,
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232 and an obligatory port.
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233 If a domain name resolves to several addresses, all of them will be
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234 used in a round-robin fashion.
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235 </para>
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236
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237 </directive>
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238
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239
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240 <directive name="proxy_timeout">
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241 <syntax><value>timeout</value></syntax>
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242 <default>10m</default>
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243 <context>stream</context>
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244 <context>server</context>
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245
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246 <para>
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247 Defines a timeout used after the proxying to the backend had started.
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248 </para>
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249
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250 </directive>
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251
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252
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253 <directive name="proxy_upstream_buffer">
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254 <syntax><value>size</value></syntax>
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255 <default>16k</default>
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256 <context>stream</context>
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257 <context>server</context>
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258
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259 <para>
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260 Sets the <value>size</value> of the
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261 buffers used for reading data from the upstream server.
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262 </para>
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263
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264 </directive>
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265
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266
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267 <directive name="server">
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268 <syntax block="yes"/>
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269 <default/>
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270 <context>stream</context>
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271
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272 <para>
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273 Sets the configuration for a server.
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274 </para>
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275
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276 </directive>
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277
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278
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279 <directive name="stream">
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280 <syntax block="yes"/>
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281 <default/>
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282 <context>main</context>
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283
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284 <para>
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285 Provides the configuration file context in which the stream server directives
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286 are specified.
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287 </para>
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288
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289 </directive>
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290
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291 </section>
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292
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293 </module>