Mercurial > hg > nginx-site
annotate xml/en/docs/ngx_core_module.xml @ 589:764fbac1b8b4
Added document revision.
author | Ruslan Ermilov <ru@nginx.com> |
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date | Tue, 17 Jul 2012 05:02:15 +0000 |
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1 <?xml version="1.0"?> |
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2 |
580
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3 <!-- |
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4 Copyright (C) Igor Sysoev |
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5 Copyright (C) Nginx, Inc. |
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6 --> |
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7 |
63
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8 <!DOCTYPE module SYSTEM "../../../dtd/module.dtd"> |
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9 |
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10 <module name="Core functionality" |
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11 link="/en/docs/ngx_core_module.html" |
589 | 12 lang="en" |
13 rev="1"> | |
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14 |
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15 <section id="example" name="Example Configuration"> |
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16 |
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17 <para> |
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18 <example> |
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19 user www www; |
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20 worker_processes 2; |
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21 |
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22 error_log /var/log/nginx-error.log info; |
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23 |
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24 events { |
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25 use kqueue; |
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26 worker_connections 2048; |
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27 } |
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28 |
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29 ... |
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30 </example> |
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31 </para> |
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32 |
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33 </section> |
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34 |
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35 |
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36 <section id="directives" name="Directives"> |
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37 |
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38 <directive name="accept_mutex"> |
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39 <syntax><literal>on</literal> | <literal>off</literal></syntax> |
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40 <default>on</default> |
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41 <context>events</context> |
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42 |
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43 <para> |
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44 If enabled, |
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45 accepts of new connections by multiple worker processes will be serialized. |
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46 Otherwise, all worker processes will be notified about new connections, |
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47 and if volume of new connections is low, some of the worker processes |
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48 may just waste system resources. |
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49 <note> |
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50 The use of <link doc="events.xml" id="rtsig"/> |
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51 connection processing method |
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52 requires <literal>accept_mutex</literal> to be enabled. |
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53 </note> |
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54 </para> |
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55 |
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56 </directive> |
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57 |
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58 |
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59 <directive name="accept_mutex_delay"> |
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60 <syntax><value>time</value></syntax> |
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61 <default>500ms</default> |
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62 <context>events</context> |
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63 |
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64 <para> |
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65 If <link id="accept_mutex"/> is enabled, specifies the maximum time |
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66 during which a worker process will try to restart accepting new |
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67 connections if another worker process is already doing this |
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68 currently. |
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69 </para> |
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70 |
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71 </directive> |
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72 |
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73 |
63
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74 <directive name="daemon"> |
271 | 75 <syntax><literal>on</literal> | <literal>off</literal></syntax> |
102
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76 <default>on</default> |
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77 <context>main</context> |
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78 |
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79 <para> |
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80 Determines whether nginx should become a daemon. |
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81 Mainly used during development. |
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82 </para> |
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83 |
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84 </directive> |
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85 |
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86 |
516
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87 <directive name="debug_connection"> |
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88 <syntax> |
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89 <value>address</value> | |
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90 <value>CIDR</value> | |
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91 <literal>unix:</literal></syntax> |
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92 <default/> |
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93 <context>events</context> |
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94 |
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95 <para> |
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96 Enables debugging log for selected client connections. |
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97 Other connections will use logging level set by the |
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98 <link id="error_log"/> directive. |
523 | 99 Debugged connections are specified by IPv4 or IPv6 (1.3.0, 1.2.1) |
100 address or network. | |
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101 A connection may also be specified using a hostname, in which case the |
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102 first IPv4 address corresponding to a name is used. |
523 | 103 For connections using UNIX-domain sockets (1.3.0, 1.2.1), |
104 debugging log is enabled by the “<literal>unix:</literal>” parameter. | |
516
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105 <example> |
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106 events { |
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107 debug_connection 127.0.0.1; |
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108 debug_connection localhost; |
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109 debug_connection 192.0.2.0/24; |
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110 debug_connection ::1; |
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111 debug_connection 2001:0db8::/32; |
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112 debug_connection unix:; |
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113 ... |
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114 } |
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115 </example> |
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116 <note> |
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117 For this directive to work, nginx needs to |
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118 be built with <literal>--with-debug</literal>. |
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119 </note> |
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120 </para> |
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121 |
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122 </directive> |
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123 |
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124 |
574 | 125 <directive name="debug_points"> |
126 <syntax><literal>abort</literal> | <literal>stop</literal></syntax> | |
127 <default/> | |
128 <context>main</context> | |
129 | |
130 <para> | |
131 This directive is used for debugging. | |
132 </para> | |
133 | |
134 <para> | |
135 When internal error is detected, e.g. the leak of sockets on | |
136 restart of working processes, enabling <literal>debug_points</literal> | |
137 leads to a core file creation (<literal>abort</literal>) | |
138 or stopping a process (<literal>stop</literal>) for further | |
139 analysis using a system debugger. | |
140 </para> | |
141 | |
142 </directive> | |
143 | |
144 | |
158
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145 <directive name="error_log"> |
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146 <syntax> |
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147 <value>file</value> | <literal>stderr</literal> |
271 | 148 [<literal>debug</literal> | |
149 <literal>info</literal> | | |
150 <literal>notice</literal> | | |
151 <literal>warn</literal> | | |
152 <literal>error</literal> | | |
153 <literal>crit</literal> | | |
154 <literal>alert</literal> | | |
155 <literal>emerg</literal>]</syntax> | |
158
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156 <default>logs/error.log error</default> |
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157 <context>main</context> |
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158 <context>http</context> |
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159 <context>server</context> |
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160 <context>location</context> |
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161 |
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162 <para> |
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163 Configures logging. |
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164 </para> |
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165 |
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166 <para> |
271 | 167 The first parameter defines a file that will store the log. |
158
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168 <!-- |
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169 If filename is not absolute, it is prefixed with the prefix path. |
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170 --> |
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171 The special value <literal>stderr</literal> selects the standard error file. |
158
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172 </para> |
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173 |
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174 <para> |
271 | 175 The second parameter determines the level of logging. |
158
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176 Log levels above are listed in the order of increasing severity. |
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177 Setting a certain log level will cause all messages of |
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178 the specified and more severe log levels to be logged. |
271 | 179 For example, the default level <literal>error</literal> will |
180 cause <literal>error</literal>, <literal>crit</literal>, | |
181 <literal>alert</literal>, and <literal>emerg</literal> messages | |
158
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182 to be logged. |
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183 If this parameter is omitted then <literal>error</literal> is used. |
158
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184 <note> |
271 | 185 For <literal>debug</literal> logging to work, nginx needs to |
186 be built with <literal>--with-debug</literal>. | |
158
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187 </note> |
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188 </para> |
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189 |
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190 </directive> |
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191 |
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192 |
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193 <directive name="env"> |
271 | 194 <syntax><value>variable</value>[=<value>value</value>]</syntax> |
102
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195 <default>TZ</default> |
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196 <context>main</context> |
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197 |
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198 <para> |
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199 Allows to limit a set of environment variables, change their values, |
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200 or create new environment variables, for the following cases: |
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201 <list type="bullet"> |
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202 |
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203 <listitem> |
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204 variable inheritance during a |
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205 <link doc="control.xml" id="upgrade">live upgrade</link> |
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206 of an executable file; |
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207 </listitem> |
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208 |
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209 <listitem> |
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210 use of variables by the module |
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211 <link doc="http/ngx_http_perl_module.xml">ngx_http_perl_module</link>; |
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212 </listitem> |
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213 |
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214 <listitem> |
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215 use of variables by worker processes. |
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216 Please bear in mind that controlling system libraries in this way |
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217 is not always possible as it is not uncommon for libraries to check |
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218 variables only during initialization, well before they can be set |
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219 using this directive. |
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220 An exception from this is an above mentioned |
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221 <link doc="control.xml" id="upgrade">live upgrade</link> |
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222 of an executable file. |
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223 </listitem> |
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224 |
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225 </list> |
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226 </para> |
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227 |
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228 <para> |
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229 The TZ variable is always inherited and made available to the module |
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230 <link doc="http/ngx_http_perl_module.xml">ngx_http_perl_module</link>, |
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231 unless configured explicitly. |
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232 </para> |
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233 |
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234 <para> |
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235 Usage example: |
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236 <example> |
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237 env MALLOC_OPTIONS; |
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238 env PERL5LIB=/data/site/modules; |
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239 env OPENSSL_ALLOW_PROXY_CERTS=1; |
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240 </example> |
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241 </para> |
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242 |
444
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243 <para> |
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244 <note> |
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245 The NGINX environment variable is used internally by nginx |
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246 and should not be set directly by the user. |
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247 </note> |
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248 </para> |
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249 |
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250 </directive> |
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251 |
249 | 252 |
556
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253 <directive name="events"> |
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254 <syntax block="yes"/> |
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255 <default/> |
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256 <context>main</context> |
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257 |
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258 <para> |
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259 Provides a configuration file context in which the directives that |
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260 affect connection processing are specified. |
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261 </para> |
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262 |
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263 </directive> |
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264 |
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265 |
63
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266 <directive name="include"> |
271 | 267 <syntax><value>file</value> | <value>mask</value></syntax> |
63
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268 <default/> |
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269 <context/> |
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270 |
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271 <para> |
271 | 272 Includes another <value>file</value>, or files matching the |
273 specified <value>mask</value>, into configuration. | |
63
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274 Included files should consist of |
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275 syntactically correct directives and blocks. |
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276 </para> |
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277 |
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278 <para> |
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279 Usage example: |
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280 <example> |
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281 include mime.types; |
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282 include vhosts/*.conf; |
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283 </example> |
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284 </para> |
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285 |
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286 </directive> |
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287 |
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288 |
571
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289 <directive name="lock_file"> |
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290 <syntax><value>file</value></syntax> |
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291 <default>logs/nginx.lock</default> |
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292 <context>main</context> |
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293 |
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294 <para> |
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295 nginx uses the locking mechanism to implement <link id="accept_mutex"/> |
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296 and serialize accesses to shared memory. |
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297 On most systems the locks are implemented using atomic operations, |
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298 and this directive is ignored. |
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299 On other systems the “lock file” mechanism is used. |
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300 This directive specifies a prefix for the names of lock files. |
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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 |
63
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306 <directive name="master_process"> |
271 | 307 <syntax><literal>on</literal> | <literal>off</literal></syntax> |
102
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308 <default>on</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 Determines whether worker processes are started. |
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313 This directive is intended for nginx developers. |
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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 |
571
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319 <directive name="multi_accept"> |
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320 <syntax><literal>on</literal> | <literal>off</literal></syntax> |
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321 <default>off</default> |
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322 <context>events</context> |
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323 |
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324 <para> |
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325 If disabled, a worker process |
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326 will accept one new connection at a time. |
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327 Otherwise, a worker process |
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328 will accept all new connections at a time. |
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329 <note> |
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330 The directive is ignored if <link doc="events.xml" id="kqueue"/> |
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331 connection processing method is used because it can report |
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332 the number of new connections waiting to be accepted. |
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333 </note> |
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334 <note> |
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335 The use of <link doc="events.xml" id="rtsig"/> |
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336 connection processing method |
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337 automatically enables <literal>multi_accept</literal>. |
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338 </note> |
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339 </para> |
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340 |
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341 </directive> |
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342 |
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343 |
289
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344 <directive name="pcre_jit"> |
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345 <syntax><literal>on</literal> | <literal>off</literal></syntax> |
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346 <default>off</default> |
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347 <context>main</context> |
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348 <appeared-in>1.1.12</appeared-in> |
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349 |
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350 <para> |
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351 Enables or disables the use of “just-in-time compilation” (PCRE JIT) |
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352 for regular expressions known at configuration parse time. |
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353 </para> |
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354 |
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355 <para> |
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356 PCRE JIT can speed up processing of regular expressions significantly. |
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357 <note> |
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358 The JIT is available in PCRE libraries starting from version 8.20 |
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359 built with the <literal>--enable-jit</literal> configuration parameter. |
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360 When building the PCRE library with nginx (<literal>--with-pcre=</literal>), |
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361 the JIT support should be enabled with the |
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362 <literal>--with-pcre-jit</literal> configuration parameter. |
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363 </note> |
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364 </para> |
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365 |
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366 </directive> |
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367 |
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368 |
63
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369 <directive name="pid"> |
271 | 370 <syntax><value>file</value></syntax> |
102
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371 <default>nginx.pid</default> |
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372 <context>main</context> |
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373 |
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374 <para> |
271 | 375 Defines a <value>file</value> that will store the process ID of the main process. |
63
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376 </para> |
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377 |
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378 </directive> |
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379 |
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380 |
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381 <directive name="ssl_engine"> |
271 | 382 <syntax><value>device</value></syntax> |
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383 <default/> |
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384 <context>main</context> |
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385 |
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386 <para> |
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387 Defines the name of the hardware SSL accelerator. |
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388 </para> |
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389 |
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390 </directive> |
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391 |
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392 |
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393 <directive name="timer_resolution"> |
271 | 394 <syntax><value>interval</value></syntax> |
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395 <default/> |
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396 <context>main</context> |
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397 |
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398 <para> |
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399 Reduces timer resolution in worker processes, thus reducing the |
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400 number of <c-func>gettimeofday</c-func> system calls made. |
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401 By default, <c-func>gettimeofday</c-func> is called each time |
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402 on receiving a kernel event. |
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403 With reduced resolution, <c-func>gettimeofday</c-func> is only |
271 | 404 called once per specified <value>interval</value>. |
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405 </para> |
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406 |
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407 <para> |
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408 Example: |
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409 <example> |
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410 timer_resolution 100ms; |
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411 </example> |
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412 </para> |
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413 |
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414 <para> |
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415 An internal implementation of interval depends on the method used: |
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416 <list type="bullet"> |
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417 |
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418 <listitem> |
271 | 419 an <c-def>EVFILT_TIMER</c-def> filter if <literal>kqueue</literal> is used; |
63
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420 </listitem> |
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421 |
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422 <listitem> |
271 | 423 <c-func>timer_create</c-func> if <literal>eventport</literal> is used; |
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424 </listitem> |
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425 |
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426 <listitem> |
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427 <c-func>setitimer</c-func> otherwise. |
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428 </listitem> |
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429 |
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430 </list> |
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431 </para> |
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432 |
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433 </directive> |
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434 |
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435 |
556
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436 <directive name="use"> |
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437 <syntax><value>method</value></syntax> |
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438 <default/> |
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439 <context>events</context> |
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440 |
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441 <para> |
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442 Specifies the <link doc="events.xml">connection processing</link> |
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443 <value>method</value> to use. |
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444 There is normally no need to specify it explicitly because nginx will |
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445 by default use the most efficient method. |
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446 </para> |
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447 |
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448 </directive> |
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449 |
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450 |
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451 <directive name="user"> |
271 | 452 <syntax><value>user</value> [<value>group</value>]</syntax> |
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453 <default>nobody nobody</default> |
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454 <context>main</context> |
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455 |
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456 <para> |
271 | 457 Defines <value>user</value> and <value>group</value> |
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458 credentials used by worker processes. |
271 | 459 If <value>group</value> is omitted, a group whose name equals |
460 that of <value>user</value> is used. | |
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461 </para> |
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462 |
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463 </directive> |
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464 |
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465 |
545
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466 <directive name="worker_connections"> |
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467 <syntax><value>number</value></syntax> |
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468 <default>512</default> |
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469 <context>events</context> |
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470 |
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471 <para> |
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472 Sets the maximum number of simultaneous connections that |
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473 can be opened by a worker process. |
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474 </para> |
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475 |
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476 <para> |
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477 It should be kept in mind that this number includes all connections |
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478 (e.g. connections with proxied servers, among other things), |
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479 not only connections with clients. |
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480 Another consideration is that the actual number of simultaneous |
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481 connections may not exceed the current limit on |
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482 the maximum number of open files, see |
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483 <link id="worker_rlimit_nofile"/>. |
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484 </para> |
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485 |
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486 </directive> |
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487 |
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488 |
469
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489 <directive name="worker_cpu_affinity"> |
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490 <syntax><value>cpumask</value> ...</syntax> |
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491 <default/> |
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492 <context>main</context> |
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493 |
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494 <para> |
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495 Binds worker processes to the sets of CPUs. |
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496 Each CPU set is represented by a bitmask of allowed to use CPUs. |
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497 There should be a separate set defined for each of the worker processes. |
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498 By default, worker processes are not bound to any specific CPUs. |
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499 </para> |
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500 |
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501 <para> |
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502 For example, |
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503 <example> |
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504 worker_processes 4; |
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505 worker_cpu_affinity 0001 0010 0100 1000; |
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506 </example> |
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507 binds each worker process to a separate CPU, while |
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508 <example> |
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509 worker_processes 2; |
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510 worker_cpu_affinity 0101 1010; |
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511 </example> |
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512 binds the first worker process to CPU0/CPU2, |
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513 and the second worker process to CPU1/CPU3. |
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514 The second example is suitable for hyper-threading. |
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515 </para> |
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516 |
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517 <para> |
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518 <note> |
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519 The directive is only available on FreeBSD and Linux. |
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520 </note> |
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521 </para> |
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522 |
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523 </directive> |
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524 |
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525 |
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526 <directive name="worker_priority"> |
271 | 527 <syntax><value>number</value></syntax> |
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528 <default>0</default> |
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529 <context>main</context> |
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530 |
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531 <para> |
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532 Defines a scheduling priority for worker processes like is |
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533 done by the <command>nice</command> command: a negative |
271 | 534 <value>number</value> |
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535 means higher priority. |
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536 Allowed range normally varies from -20 to 20. |
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537 </para> |
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538 |
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539 <para> |
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540 Example: |
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541 <example> |
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542 worker_priority -10; |
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543 </example> |
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544 </para> |
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545 |
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546 </directive> |
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547 |
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548 |
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549 <directive name="worker_processes"> |
271 | 550 <syntax><value>number</value></syntax> |
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551 <default>1</default> |
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552 <context>main</context> |
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553 |
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554 <para> |
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555 Defines the number of worker processes. |
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556 </para> |
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557 |
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558 <para> |
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559 The optimal value depends on many factors including (but not |
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560 limited to) the number of CPU cores, the number of hard disk |
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561 drives that store data, and load pattern. |
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562 When in doubt, setting it to the number of available CPU cores |
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563 would be a good start. |
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564 </para> |
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565 |
63
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566 </directive> |
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567 |
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568 |
82
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569 <directive name="worker_rlimit_core"> |
271 | 570 <syntax><value>size</value></syntax> |
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571 <default/> |
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572 <context>main</context> |
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573 |
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574 <para> |
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575 Changes the limit on the largest size of a core file |
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576 (<c-def>RLIMIT_CORE</c-def>) for worker processes. |
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577 Used to increase the limit without restarting the main process. |
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578 </para> |
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579 |
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580 </directive> |
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581 |
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582 |
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583 <directive name="worker_rlimit_nofile"> |
271 | 584 <syntax><value>number</value></syntax> |
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585 <default/> |
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586 <context>main</context> |
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587 |
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588 <para> |
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589 Changes the limit on the maximum number of open files |
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590 (<c-def>RLIMIT_NOFILE</c-def>) for worker processes. |
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591 Used to increase the limit without restarting the main process. |
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592 </para> |
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593 |
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594 </directive> |
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595 |
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596 |
554
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597 <directive name="worker_rlimit_sigpending"> |
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598 <syntax><value>number</value></syntax> |
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599 <default/> |
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600 <context>main</context> |
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601 |
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602 <para> |
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603 On systems that support <link doc="events.xml" id="rtsig"/> |
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604 connection processing method, |
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605 changes the limit on the number of signals that may be queued |
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606 (<c-def>RLIMIT_SIGPENDING</c-def>) for worker processes. |
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607 Used to increase the limit without restarting the main process. |
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608 </para> |
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609 |
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610 </directive> |
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611 |
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612 |
63
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613 <directive name="working_directory"> |
271 | 614 <syntax><value>directory</value></syntax> |
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615 <default/> |
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616 <context>main</context> |
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617 |
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618 <para> |
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619 Defines a current working directory for a worker process. |
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620 It is primarily used when writing a core-file, in which case |
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621 a worker process should have write permission for the |
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622 specified directory. |
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623 </para> |
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624 |
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625 </directive> |
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626 |
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627 </section> |
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628 |
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629 </module> |