Mercurial > hg > nginx-site
annotate xml/en/docs/stream/ngx_stream_core_module.xml @ 1754:c6c9ed2ea7e4
Updated with Netcraft July 2016 Web Server Survey stats.
author | Yaroslav Zhuravlev <yar@nginx.com> |
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date | Tue, 19 Jul 2016 23:13:21 +0300 |
parents | 256774f145ac |
children | 061b590cbe1a |
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="15"> |
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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 upstream dns { |
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49 server 192.168.0.1:53535; |
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50 server dns.example.com:53; |
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51 } |
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52 |
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53 server { |
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54 listen 12345; |
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55 proxy_connect_timeout 1s; |
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56 proxy_timeout 3s; |
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57 proxy_pass backend; |
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58 } |
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59 |
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60 server { |
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61 listen 127.0.0.1:53 udp; |
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62 proxy_responses 1; |
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63 proxy_timeout 20s; |
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64 proxy_pass dns; |
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65 } |
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66 |
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67 server { |
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68 listen [::1]:12345; |
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69 proxy_pass unix:/tmp/stream.socket; |
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70 } |
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71 } |
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72 </example> |
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73 </para> |
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74 |
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75 </section> |
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76 |
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77 |
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78 <section id="directives" name="Directives"> |
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79 |
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80 <directive name="listen"> |
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81 <syntax> |
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82 <value>address</value>:<value>port</value> |
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83 [<literal>ssl</literal>] |
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84 [<literal>udp</literal>] |
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85 [<literal>backlog</literal>=<value>number</value>] |
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86 [<literal>bind</literal>] |
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87 [<literal>ipv6only</literal>=<literal>on</literal>|<literal>off</literal>] |
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88 [<literal>reuseport</literal>] |
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89 [<literal>so_keepalive</literal>=<literal>on</literal>|<literal>off</literal>|[<value>keepidle</value>]:[<value>keepintvl</value>]:[<value>keepcnt</value>]]</syntax> |
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90 <default/> |
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91 <context>server</context> |
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92 |
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93 <para> |
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94 Sets the <value>address</value> and <value>port</value> for the socket |
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95 on which the server will accept connections. |
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96 It is possible to specify just the port. |
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97 The address can also be a hostname, for example: |
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98 <example> |
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99 listen 127.0.0.1:12345; |
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100 listen *:12345; |
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101 listen 12345; # same as *:12345 |
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102 listen localhost:12345; |
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103 </example> |
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104 IPv6 addresses are specified in square brackets: |
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105 <example> |
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106 listen [::1]:12345; |
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107 listen [::]:12345; |
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108 </example> |
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109 UNIX-domain sockets are specified with the “<literal>unix:</literal>” |
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110 prefix: |
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111 <example> |
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112 listen unix:/var/run/nginx.sock; |
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113 </example> |
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114 |
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115 </para> |
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116 |
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117 <para> |
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118 The <literal>ssl</literal> parameter allows specifying that all |
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119 connections accepted on this port should work in SSL mode. |
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120 </para> |
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121 |
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122 <para id="udp"> |
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123 The <literal>udp</literal> parameter configures a listening socket |
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124 for working with datagrams (1.9.13). |
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125 </para> |
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126 |
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127 <para> |
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128 The <literal>listen</literal> directive |
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129 can have several additional parameters specific to socket-related system calls. |
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130 <list type="tag"> |
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131 |
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132 <tag-name> |
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133 <literal>backlog</literal>=<value>number</value> |
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134 </tag-name> |
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135 <tag-desc> |
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136 sets the <literal>backlog</literal> parameter in the |
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137 <c-func>listen</c-func> call that limits |
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138 the maximum length for the queue of pending connections (1.9.2). |
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139 By default, |
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140 <literal>backlog</literal> is set to -1 on FreeBSD, DragonFly BSD, and Mac OS X, |
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141 and to 511 on other platforms. |
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142 </tag-desc> |
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143 |
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144 <tag-name> |
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145 <literal>bind</literal> |
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146 </tag-name> |
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147 <tag-desc> |
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148 this parameter instructs to make a separate <c-func>bind</c-func> |
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149 call for a given address:port pair. |
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150 The fact is that if there are several <literal>listen</literal> directives with |
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151 the same port but different addresses, and one of the |
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152 <literal>listen</literal> directives listens on all addresses |
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153 for the given port (<literal>*:</literal><value>port</value>), nginx will |
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154 <c-func>bind</c-func> only to <literal>*:</literal><value>port</value>. |
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155 It should be noted that the <c-func>getsockname</c-func> system call will be |
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156 made in this case to determine the address that accepted the connection. |
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157 If the <literal>ipv6only</literal> |
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158 or <literal>so_keepalive</literal> parameters |
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159 are used then for a given |
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160 <value>address</value>:<value>port</value> pair |
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161 a separate <c-func>bind</c-func> call will always be made. |
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162 </tag-desc> |
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163 |
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164 <tag-name> |
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165 <literal>ipv6only</literal>=<literal>on</literal>|<literal>off</literal> |
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166 </tag-name> |
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167 <tag-desc> |
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168 this parameter determines |
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169 (via the <c-def>IPV6_V6ONLY</c-def> socket option) |
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170 whether an IPv6 socket listening on a wildcard address <literal>[::]</literal> |
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171 will accept only IPv6 connections or both IPv6 and IPv4 connections. |
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172 This parameter is turned on by default. |
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173 It can only be set once on start. |
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174 </tag-desc> |
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175 |
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176 <tag-name id="reuseport"> |
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177 <literal>reuseport</literal> |
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178 </tag-name> |
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179 <tag-desc> |
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180 this parameter (1.9.1) instructs to create an individual listening socket |
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181 for each worker process |
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182 (using the <c-def>SO_REUSEPORT</c-def> socket option), allowing a kernel |
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183 to distribute incoming connections between worker processes. |
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184 This currently works only on Linux 3.9+ and DragonFly BSD. |
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185 <note> |
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186 Inappropriate use of this option may have its security |
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187 <link url="http://man7.org/linux/man-pages/man7/socket.7.html">implications</link>. |
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188 </note> |
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189 </tag-desc> |
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190 |
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191 <tag-name> |
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192 <literal>so_keepalive</literal>=<literal>on</literal>|<literal>off</literal>|[<value>keepidle</value>]:[<value>keepintvl</value>]:[<value>keepcnt</value>] |
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193 </tag-name> |
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194 <tag-desc> |
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195 this parameter configures the “TCP keepalive” behavior |
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196 for the listening socket. |
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197 If this parameter is omitted then the operating system’s settings will be |
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198 in effect for the socket. |
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199 If it is set to the value “<literal>on</literal>”, the |
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200 <c-def>SO_KEEPALIVE</c-def> option is turned on for the socket. |
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201 If it is set to the value “<literal>off</literal>”, the |
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202 <c-def>SO_KEEPALIVE</c-def> option is turned off for the socket. |
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203 Some operating systems support setting of TCP keepalive parameters on |
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204 a per-socket basis using the <c-def>TCP_KEEPIDLE</c-def>, |
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205 <c-def>TCP_KEEPINTVL</c-def>, and <c-def>TCP_KEEPCNT</c-def> socket options. |
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206 On such systems (currently, Linux 2.4+, NetBSD 5+, and |
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207 FreeBSD 9.0-STABLE), they can be configured |
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208 using the <value>keepidle</value>, <value>keepintvl</value>, and |
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209 <value>keepcnt</value> parameters. |
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210 One or two parameters may be omitted, in which case the system default setting |
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211 for the corresponding socket option will be in effect. |
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212 For example, |
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213 <example>so_keepalive=30m::10</example> |
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214 will set the idle timeout (<c-def>TCP_KEEPIDLE</c-def>) to 30 minutes, |
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215 leave the probe interval (<c-def>TCP_KEEPINTVL</c-def>) at its system default, |
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216 and set the probes count (<c-def>TCP_KEEPCNT</c-def>) to 10 probes. |
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217 </tag-desc> |
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218 |
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219 </list> |
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220 </para> |
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221 |
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222 <para> |
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223 Different servers must listen on different |
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224 <value>address</value>:<value>port</value> pairs. |
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225 </para> |
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226 |
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227 </directive> |
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228 |
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229 |
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230 <directive name="resolver"> |
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231 <syntax> |
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232 <value>address</value> ... |
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233 [<literal>valid</literal>=<value>time</value>] |
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234 [<literal>ipv6</literal>=<literal>on</literal>|<literal>off</literal>]</syntax> |
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235 <default/> |
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236 <context>stream</context> |
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237 <context>server</context> |
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238 <appeared-in>1.11.3</appeared-in> |
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239 |
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240 <para> |
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241 Configures name servers used to resolve names of upstream servers |
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242 into addresses, for example: |
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243 <example> |
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244 resolver 127.0.0.1 [::1]:5353; |
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245 </example> |
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246 An address can be specified as a domain name or IP address, |
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247 and an optional port. |
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248 If port is not specified, the port 53 is used. |
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249 Name servers are queried in a round-robin fashion. |
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250 </para> |
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251 |
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252 <para> |
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253 By default, nginx will look up both IPv4 and IPv6 addresses while resolving. |
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254 If looking up of IPv6 addresses is not desired, |
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255 the <literal>ipv6=off</literal> parameter can be specified. |
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256 </para> |
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257 |
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258 <para> |
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259 By default, nginx caches answers using the TTL value of a response. |
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260 The optional <literal>valid</literal> parameter allows overriding it: |
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261 <example> |
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262 resolver 127.0.0.1 [::1]:5353 valid=30s; |
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263 </example> |
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264 <note> |
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265 Before version 1.11.3, this directive was available as part of our |
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266 <commercial_version>commercial subscription</commercial_version>. |
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267 </note> |
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268 </para> |
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269 |
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270 </directive> |
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271 |
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272 |
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273 <directive name="resolver_timeout"> |
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274 <syntax><value>time</value></syntax> |
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275 <default>30s</default> |
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276 <context>stream</context> |
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277 <context>server</context> |
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278 <appeared-in>1.11.3</appeared-in> |
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279 |
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280 <para> |
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281 Sets a timeout for name resolution, for example: |
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282 <example> |
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283 resolver_timeout 5s; |
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284 </example> |
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285 <note> |
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286 Before version 1.11.3, this directive was available as part of our |
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287 <commercial_version>commercial subscription</commercial_version>. |
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288 </note> |
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289 </para> |
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290 |
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291 </directive> |
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292 |
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293 |
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294 <directive name="server"> |
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295 <syntax block="yes"/> |
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296 <default/> |
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297 <context>stream</context> |
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298 |
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299 <para> |
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300 Sets the configuration for a server. |
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301 </para> |
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302 |
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303 </directive> |
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304 |
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305 |
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306 <directive name="stream"> |
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307 <syntax block="yes"/> |
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308 <default/> |
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309 <context>main</context> |
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310 |
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311 <para> |
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312 Provides the configuration file context in which the stream server directives |
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313 are specified. |
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314 </para> |
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315 |
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316 </directive> |
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317 |
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318 |
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319 <directive name="tcp_nodelay"> |
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320 <syntax><literal>on</literal> | <literal>off</literal></syntax> |
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321 <default>on</default> |
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322 <context>stream</context> |
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323 <context>server</context> |
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324 <appeared-in>1.9.4</appeared-in> |
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325 |
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326 <para> |
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327 Enables or disables the use of the <c-def>TCP_NODELAY</c-def> option. |
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328 The option is enabled for both client and proxied server connections. |
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329 </para> |
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330 |
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331 </directive> |
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332 |
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333 |
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334 <directive name="variables_hash_bucket_size"> |
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335 <syntax><value>size</value></syntax> |
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336 <default>64</default> |
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337 <context>stream</context> |
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338 <appeared-in>1.11.2</appeared-in> |
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339 |
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340 <para> |
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341 Sets the bucket size for the variables hash table. |
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342 The details of setting up hash tables are provided in a separate |
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343 <link doc="../hash.xml">document</link>. |
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344 </para> |
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345 |
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346 </directive> |
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347 |
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348 |
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349 <directive name="variables_hash_max_size"> |
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350 <syntax><value>size</value></syntax> |
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351 <default>1024</default> |
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352 <context>stream</context> |
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353 <appeared-in>1.11.2</appeared-in> |
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354 |
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355 <para> |
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356 Sets the maximum <value>size</value> of the variables hash table. |
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357 The details of setting up hash tables are provided in a separate |
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358 <link doc="../hash.xml">document</link>. |
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359 </para> |
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360 |
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361 </directive> |
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362 |
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363 </section> |
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364 |
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365 |
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366 <section id="variables" name="Embedded Variables"> |
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367 |
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368 <para> |
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369 The <literal>ngx_stream_core_module</literal> module supports variables |
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370 since 1.11.2. |
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371 <list type="tag"> |
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372 |
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373 <tag-name id="var_binary_remote_addr"><var>$binary_remote_addr</var></tag-name> |
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374 <tag-desc> |
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375 client address in a binary form, value’s length is always 4 bytes |
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376 for IPv4 addresses or 16 bytes for IPv6 addresses |
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377 </tag-desc> |
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378 |
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379 <tag-name id="var_bytes_sent"><var>$bytes_sent</var></tag-name> |
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380 <tag-desc> |
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381 number of bytes sent to a client |
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382 </tag-desc> |
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383 |
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384 <tag-name id="var_connection"><var>$connection</var></tag-name> |
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385 <tag-desc> |
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386 connection serial number |
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387 </tag-desc> |
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388 |
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389 <tag-name id="var_hostname"><var>$hostname</var></tag-name> |
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390 <tag-desc> |
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391 host name |
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392 </tag-desc> |
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393 |
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394 <tag-name id="var_msec"><var>$msec</var></tag-name> |
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395 <tag-desc> |
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396 current time in seconds with the milliseconds resolution |
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397 </tag-desc> |
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398 |
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399 <tag-name id="var_nginx_version"><var>$nginx_version</var></tag-name> |
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400 <tag-desc> |
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401 nginx version |
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402 </tag-desc> |
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403 |
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404 <tag-name id="var_pid"><var>$pid</var></tag-name> |
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405 <tag-desc> |
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406 PID of the worker process |
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407 </tag-desc> |
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408 |
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409 <tag-name id="var_remote_addr"><var>$remote_addr</var></tag-name> |
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410 <tag-desc> |
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411 client address |
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412 </tag-desc> |
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413 |
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414 <tag-name id="var_remote_port"><var>$remote_port</var></tag-name> |
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415 <tag-desc> |
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416 client port |
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417 </tag-desc> |
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418 |
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419 <tag-name id="var_server_addr"><var>$server_addr</var></tag-name> |
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420 <tag-desc> |
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421 an address of the server which accepted a connection |
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422 <para> |
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423 Computing a value of this variable usually requires one system call. |
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424 To avoid a system call, the <link id="listen"/> directives |
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425 must specify addresses and use the <literal>bind</literal> parameter. |
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426 </para> |
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427 </tag-desc> |
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428 |
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429 <tag-name id="var_server_port"><var>$server_port</var></tag-name> |
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430 <tag-desc> |
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431 port of the server which accepted a connection |
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432 </tag-desc> |
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433 |
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434 <tag-name id="var_time_iso8601"><var>$time_iso8601</var></tag-name> |
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435 <tag-desc> |
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436 local time in the ISO 8601 standard format |
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437 </tag-desc> |
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438 |
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439 <tag-name id="var_time_local"><var>$time_local</var></tag-name> |
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440 <tag-desc> |
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441 local time in the Common Log Format |
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442 </tag-desc> |
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443 |
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444 </list> |
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445 </para> |
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446 |
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447 </section> |
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448 |
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449 </module> |