Mercurial > hg > nginx-site
annotate xml/en/docs/ngx_core_module.xml @ 1719:5ea0a0ff7271
Fixed broken link.
author | Yaroslav Zhuravlev <yar@nginx.com> |
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date | Wed, 01 Jun 2016 17:43:57 +0300 |
parents | 147e3d0339e8 |
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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 |
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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" |
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13 rev="19"> |
63
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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 <literal>accept_mutex</literal> is enabled, |
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45 worker processes will accept new connections by turn. |
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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 </para> |
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50 |
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51 </directive> |
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52 |
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53 |
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54 <directive name="accept_mutex_delay"> |
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55 <syntax><value>time</value></syntax> |
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56 <default>500ms</default> |
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57 <context>events</context> |
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58 |
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59 <para> |
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60 If <link id="accept_mutex"/> is enabled, specifies the maximum time |
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61 during which a worker process will try to restart accepting new |
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62 connections if another worker process is currently accepting |
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63 new connections. |
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64 </para> |
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65 |
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66 </directive> |
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67 |
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68 |
63
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69 <directive name="daemon"> |
271 | 70 <syntax><literal>on</literal> | <literal>off</literal></syntax> |
102
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71 <default>on</default> |
63
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72 <context>main</context> |
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73 |
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74 <para> |
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75 Determines whether nginx should become a daemon. |
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76 Mainly used during development. |
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77 </para> |
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78 |
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79 </directive> |
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80 |
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81 |
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82 <directive name="debug_connection"> |
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83 <syntax> |
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84 <value>address</value> | |
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85 <value>CIDR</value> | |
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86 <literal>unix:</literal></syntax> |
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87 <default/> |
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88 <context>events</context> |
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89 |
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90 <para> |
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91 Enables debugging log for selected client connections. |
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92 Other connections will use logging level set by the |
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93 <link id="error_log"/> directive. |
523 | 94 Debugged connections are specified by IPv4 or IPv6 (1.3.0, 1.2.1) |
95 address or network. | |
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96 A connection may also be specified using a hostname. |
523 | 97 For connections using UNIX-domain sockets (1.3.0, 1.2.1), |
98 debugging log is enabled by the “<literal>unix:</literal>” parameter. | |
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99 <example> |
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100 events { |
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101 debug_connection 127.0.0.1; |
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102 debug_connection localhost; |
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103 debug_connection 192.0.2.0/24; |
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104 debug_connection ::1; |
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105 debug_connection 2001:0db8::/32; |
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106 debug_connection unix:; |
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107 ... |
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108 } |
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109 </example> |
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110 <note> |
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111 For this directive to work, nginx needs to |
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112 be built with <literal>--with-debug</literal>, |
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113 see “<link doc="debugging_log.xml"/>”. |
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114 </note> |
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115 </para> |
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116 |
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117 </directive> |
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118 |
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119 |
574 | 120 <directive name="debug_points"> |
121 <syntax><literal>abort</literal> | <literal>stop</literal></syntax> | |
122 <default/> | |
123 <context>main</context> | |
124 | |
125 <para> | |
126 This directive is used for debugging. | |
127 </para> | |
128 | |
129 <para> | |
130 When internal error is detected, e.g. the leak of sockets on | |
131 restart of working processes, enabling <literal>debug_points</literal> | |
132 leads to a core file creation (<literal>abort</literal>) | |
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133 or to stopping of a process (<literal>stop</literal>) for further |
574 | 134 analysis using a system debugger. |
135 </para> | |
136 | |
137 </directive> | |
138 | |
139 | |
158
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140 <directive name="error_log"> |
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141 <syntax><value>file</value> [<value>level</value>]</syntax> |
158
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142 <default>logs/error.log error</default> |
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143 <context>main</context> |
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144 <context>http</context> |
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145 <context>mail</context> |
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146 <context>stream</context> |
158
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147 <context>server</context> |
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148 <context>location</context> |
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149 |
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150 <para> |
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151 Configures logging. |
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152 Several logs can be specified on the same level (1.5.2). |
158
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153 </para> |
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154 |
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155 <para> |
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156 The first parameter defines a <value>file</value> that will store the log. |
158
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157 <!-- |
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158 If filename is not absolute, it is prefixed with the prefix path. |
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159 --> |
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160 The special value <literal>stderr</literal> selects the standard error file. |
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161 Logging to <link doc="syslog.xml">syslog</link> can be configured by specifying |
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162 the “<literal>syslog:</literal>” prefix. |
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163 Logging to a |
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164 <link doc="debugging_log.xml" id="memory">cyclic memory buffer</link> |
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165 can be configured by specifying the “<literal>memory:</literal>” prefix and |
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166 buffer <value>size</value>, and is generally used for debugging (1.7.11). |
158
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167 </para> |
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168 |
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169 <para> |
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170 The second parameter determines the <value>level</value> of logging, |
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171 and can be one of the following: |
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172 <literal>debug</literal>, <literal>info</literal>, <literal>notice</literal>, |
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173 <literal>warn</literal>, <literal>error</literal>, <literal>crit</literal>, |
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174 <literal>alert</literal>, or <literal>emerg</literal>. |
158
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175 Log levels above are listed in the order of increasing severity. |
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176 Setting a certain log level will cause all messages of |
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177 the specified and more severe log levels to be logged. |
271 | 178 For example, the default level <literal>error</literal> will |
179 cause <literal>error</literal>, <literal>crit</literal>, | |
180 <literal>alert</literal>, and <literal>emerg</literal> messages | |
158
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181 to be logged. |
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182 If this parameter is omitted then <literal>error</literal> is used. |
158
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183 <note> |
271 | 184 For <literal>debug</literal> logging to work, nginx needs to |
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185 be built with <literal>--with-debug</literal>, |
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186 see “<link doc="debugging_log.xml"/>”. |
158
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187 </note> |
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188 |
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189 <note> |
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190 The directive can be specified on the |
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191 <literal>stream</literal> level |
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192 starting from version 1.7.11. |
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193 </note> |
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194 |
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195 <note> |
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196 The directive can be specified on the |
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197 <literal>mail</literal> level |
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198 starting from version 1.9.0. |
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199 </note> |
158
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200 </para> |
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201 |
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202 </directive> |
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203 |
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204 |
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205 <directive name="env"> |
271 | 206 <syntax><value>variable</value>[=<value>value</value>]</syntax> |
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207 <default>TZ</default> |
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208 <context>main</context> |
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209 |
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210 <para> |
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211 By default, nginx removes all environment variables inherited |
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212 from its parent process except the TZ variable. |
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213 This directive allows preserving some of the inherited variables, |
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214 changing their values, or creating new environment variables. |
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215 These variables are then: |
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216 <list type="bullet"> |
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217 |
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218 <listitem> |
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219 inherited during a <link doc="control.xml" id="upgrade">live upgrade</link> |
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220 of an executable file; |
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221 </listitem> |
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222 |
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223 <listitem> |
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224 used by the |
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225 <link doc="http/ngx_http_perl_module.xml">ngx_http_perl_module</link> module; |
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226 </listitem> |
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227 |
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228 <listitem> |
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229 used by worker processes. |
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230 One should bear in mind that controlling system libraries in this way |
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231 is not always possible as it is common for libraries to check |
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232 variables only during initialization, well before they can be set |
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233 using this directive. |
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234 An exception from this is an above mentioned |
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235 <link doc="control.xml" id="upgrade">live upgrade</link> |
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236 of an executable file. |
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237 </listitem> |
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238 |
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239 </list> |
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240 </para> |
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241 |
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242 <para> |
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243 The TZ variable is always inherited and available to the |
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244 <link doc="http/ngx_http_perl_module.xml">ngx_http_perl_module</link> |
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245 module, unless it is configured explicitly. |
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246 </para> |
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247 |
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248 <para> |
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249 Usage example: |
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250 <example> |
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251 env MALLOC_OPTIONS; |
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252 env PERL5LIB=/data/site/modules; |
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253 env OPENSSL_ALLOW_PROXY_CERTS=1; |
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254 </example> |
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255 </para> |
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256 |
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257 <para> |
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258 <note> |
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259 The NGINX environment variable is used internally by nginx |
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260 and should not be set directly by the user. |
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261 </note> |
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262 </para> |
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263 |
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264 </directive> |
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265 |
249 | 266 |
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267 <directive name="events"> |
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268 <syntax block="yes"/> |
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269 <default/> |
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270 <context>main</context> |
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271 |
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272 <para> |
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273 Provides the configuration file context in which the directives that |
556
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274 affect connection processing are specified. |
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275 </para> |
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276 |
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277 </directive> |
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278 |
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279 |
63
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280 <directive name="include"> |
271 | 281 <syntax><value>file</value> | <value>mask</value></syntax> |
63
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282 <default/> |
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283 <context/> |
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284 |
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285 <para> |
271 | 286 Includes another <value>file</value>, or files matching the |
287 specified <value>mask</value>, into configuration. | |
63
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288 Included files should consist of |
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289 syntactically correct directives and blocks. |
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290 </para> |
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291 |
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292 <para> |
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293 Usage example: |
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294 <example> |
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295 include mime.types; |
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296 include vhosts/*.conf; |
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297 </example> |
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298 </para> |
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299 |
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300 </directive> |
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301 |
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302 |
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303 <directive name="load_module"> |
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304 <syntax><value>file</value></syntax> |
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305 <default/> |
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306 <context>main</context> |
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307 <appeared-in>1.9.11</appeared-in> |
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308 |
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309 <para> |
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310 Loads a dynamic module. |
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311 </para> |
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312 |
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313 <para> |
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314 Example: |
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315 <example> |
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316 load_module modules/ngx_mail_module.so; |
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317 </example> |
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318 </para> |
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319 |
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320 </directive> |
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321 |
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322 |
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323 <directive name="lock_file"> |
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324 <syntax><value>file</value></syntax> |
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325 <default>logs/nginx.lock</default> |
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326 <context>main</context> |
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327 |
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328 <para> |
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329 nginx uses the locking mechanism to implement <link id="accept_mutex"/> |
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330 and serialize access to shared memory. |
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331 On most systems the locks are implemented using atomic operations, |
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332 and this directive is ignored. |
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333 On other systems the “lock file” mechanism is used. |
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334 This directive specifies a prefix for the names of lock files. |
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335 </para> |
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336 |
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337 </directive> |
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338 |
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339 |
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340 <directive name="master_process"> |
271 | 341 <syntax><literal>on</literal> | <literal>off</literal></syntax> |
102
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342 <default>on</default> |
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343 <context>main</context> |
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344 |
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345 <para> |
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346 Determines whether worker processes are started. |
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347 This directive is intended for nginx developers. |
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348 </para> |
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349 |
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350 </directive> |
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351 |
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352 |
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353 <directive name="multi_accept"> |
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354 <syntax><literal>on</literal> | <literal>off</literal></syntax> |
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355 <default>off</default> |
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356 <context>events</context> |
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357 |
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358 <para> |
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359 If <literal>multi_accept</literal> is disabled, a worker process |
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360 will accept one new connection at a time. |
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361 Otherwise, a worker process |
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362 will accept all new connections at a time. |
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363 <note> |
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364 The directive is ignored if <link doc="events.xml" id="kqueue"/> |
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365 connection processing method is used, because it reports |
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366 the number of new connections waiting to be accepted. |
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367 </note> |
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368 </para> |
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369 |
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370 </directive> |
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371 |
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372 |
289
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373 <directive name="pcre_jit"> |
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374 <syntax><literal>on</literal> | <literal>off</literal></syntax> |
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375 <default>off</default> |
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376 <context>main</context> |
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377 <appeared-in>1.1.12</appeared-in> |
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378 |
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379 <para> |
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380 Enables or disables the use of “just-in-time compilation” (PCRE JIT) |
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381 for the regular expressions known by the time of configuration parsing. |
289
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382 </para> |
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383 |
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384 <para> |
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385 PCRE JIT can speed up processing of regular expressions significantly. |
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386 <note> |
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387 The JIT is available in PCRE libraries starting from version 8.20 |
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388 built with the <literal>--enable-jit</literal> configuration parameter. |
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389 When the PCRE library is built with nginx (<literal>--with-pcre=</literal>), |
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390 the JIT support is enabled via the |
289
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391 <literal>--with-pcre-jit</literal> configuration parameter. |
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392 </note> |
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393 </para> |
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394 |
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395 </directive> |
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396 |
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397 |
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398 <directive name="pid"> |
271 | 399 <syntax><value>file</value></syntax> |
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400 <default>nginx.pid</default> |
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401 <context>main</context> |
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402 |
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403 <para> |
271 | 404 Defines a <value>file</value> that will store the process ID of the main process. |
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405 </para> |
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406 |
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407 </directive> |
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408 |
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409 |
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410 <directive name="ssl_engine"> |
271 | 411 <syntax><value>device</value></syntax> |
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412 <default/> |
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413 <context>main</context> |
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414 |
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415 <para> |
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416 Defines the name of the hardware SSL accelerator. |
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417 </para> |
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418 |
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419 </directive> |
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420 |
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421 |
1436 | 422 <directive name="thread_pool"> |
423 <syntax> | |
424 <value>name</value> | |
425 <literal>threads</literal>=<value>number</value> | |
426 [<literal>max_queue</literal>=<value>number</value>]</syntax> | |
427 <default>default threads=32 max_queue=65536</default> | |
428 <context>main</context> | |
429 <appeared-in>1.7.11</appeared-in> | |
430 | |
431 <para> | |
432 Defines named thread pools | |
433 used for multi-threaded reading and sending of files | |
434 <link doc="http/ngx_http_core_module.xml" id="aio">without blocking</link> | |
435 worker processes. | |
436 </para> | |
437 | |
438 <para> | |
439 The <literal>threads</literal> parameter | |
440 defines the number of threads in the pool. | |
441 </para> | |
442 | |
443 <para> | |
444 In the event that all threads in the pool are busy, | |
445 a new task will wait in the queue. | |
446 The <literal>max_queue</literal> parameter limits the number | |
447 of tasks allowed to be waiting in the queue. | |
448 By default, up to 65536 tasks can wait in the queue. | |
449 When the queue overflows, the task is completed with an error. | |
450 </para> | |
451 | |
452 </directive> | |
453 | |
454 | |
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455 <directive name="timer_resolution"> |
271 | 456 <syntax><value>interval</value></syntax> |
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457 <default/> |
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458 <context>main</context> |
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459 |
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460 <para> |
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461 Reduces timer resolution in worker processes, thus reducing the |
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462 number of <c-func>gettimeofday</c-func> system calls made. |
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463 By default, <c-func>gettimeofday</c-func> is called each time |
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464 a kernel event is received. |
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465 With reduced resolution, <c-func>gettimeofday</c-func> is only |
271 | 466 called once per specified <value>interval</value>. |
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467 </para> |
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468 |
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469 <para> |
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470 Example: |
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471 <example> |
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472 timer_resolution 100ms; |
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473 </example> |
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474 </para> |
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475 |
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476 <para> |
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477 Internal implementation of the interval depends on the method used: |
63
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478 <list type="bullet"> |
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479 |
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480 <listitem> |
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481 the <c-def>EVFILT_TIMER</c-def> filter if <literal>kqueue</literal> is used; |
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482 </listitem> |
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483 |
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484 <listitem> |
271 | 485 <c-func>timer_create</c-func> if <literal>eventport</literal> is used; |
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486 </listitem> |
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487 |
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488 <listitem> |
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489 <c-func>setitimer</c-func> otherwise. |
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490 </listitem> |
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491 |
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492 </list> |
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493 </para> |
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494 |
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495 </directive> |
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496 |
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497 |
556
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498 <directive name="use"> |
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499 <syntax><value>method</value></syntax> |
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500 <default/> |
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501 <context>events</context> |
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502 |
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503 <para> |
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504 Specifies the <link doc="events.xml">connection processing</link> |
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505 <value>method</value> to use. |
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506 There is normally no need to specify it explicitly, because nginx will |
556
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507 by default use the most efficient method. |
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508 </para> |
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509 |
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510 </directive> |
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511 |
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512 |
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513 <directive name="user"> |
271 | 514 <syntax><value>user</value> [<value>group</value>]</syntax> |
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515 <default>nobody nobody</default> |
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516 <context>main</context> |
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517 |
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518 <para> |
271 | 519 Defines <value>user</value> and <value>group</value> |
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520 credentials used by worker processes. |
271 | 521 If <value>group</value> is omitted, a group whose name equals |
522 that of <value>user</value> is used. | |
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523 </para> |
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524 |
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525 </directive> |
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526 |
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527 |
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528 <directive name="worker_aio_requests"> |
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529 <syntax><value>number</value></syntax> |
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530 <default>32</default> |
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531 <context>events</context> |
750
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532 <appeared-in>1.1.4</appeared-in> |
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533 <appeared-in>1.0.7</appeared-in> |
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534 |
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535 <para> |
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536 When using <link doc="http/ngx_http_core_module.xml" id="aio"/> |
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537 with the <link doc="../docs/events.xml" id="epoll"/> |
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538 connection processing method, sets the maximum <value>number</value> of |
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539 outstanding asynchronous I/O operations |
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540 for a single worker process. |
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541 </para> |
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542 |
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543 </directive> |
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544 |
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545 |
545
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546 <directive name="worker_connections"> |
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547 <syntax><value>number</value></syntax> |
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548 <default>512</default> |
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|
549 <context>events</context> |
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550 |
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551 <para> |
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|
552 Sets the maximum number of simultaneous connections that |
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|
553 can be opened by a worker process. |
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|
554 </para> |
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|
555 |
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diff
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|
556 <para> |
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557 It should be kept in mind that this number includes all connections |
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558 (e.g. connections with proxied servers, among others), |
545
e97b46d1842d
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559 not only connections with clients. |
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560 Another consideration is that the actual number of simultaneous |
966 | 561 connections cannot exceed the current limit on |
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562 the maximum number of open files, which can be changed by |
545
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563 <link id="worker_rlimit_nofile"/>. |
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diff
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564 </para> |
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diff
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|
565 |
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566 </directive> |
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diff
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|
567 |
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523
diff
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|
568 |
469
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diff
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569 <directive name="worker_cpu_affinity"> |
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570 <syntax><value>cpumask</value> ...</syntax> |
1641
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571 <syntax><literal>auto</literal> [<value>cpumask</value>]</syntax> |
469
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572 <default/> |
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573 <context>main</context> |
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|
574 |
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|
575 <para> |
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576 Binds worker processes to the sets of CPUs. |
957
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577 Each CPU set is represented by a bitmask of allowed CPUs. |
469
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578 There should be a separate set defined for each of the worker processes. |
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579 By default, worker processes are not bound to any specific CPUs. |
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580 </para> |
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diff
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|
581 |
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|
582 <para> |
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583 For example, |
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584 <example> |
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585 worker_processes 4; |
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586 worker_cpu_affinity 0001 0010 0100 1000; |
8275e169f77b
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587 </example> |
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|
588 binds each worker process to a separate CPU, while |
8275e169f77b
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parents:
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diff
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|
589 <example> |
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diff
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|
590 worker_processes 2; |
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591 worker_cpu_affinity 0101 1010; |
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592 </example> |
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593 binds the first worker process to CPU0/CPU2, |
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594 and the second worker process to CPU1/CPU3. |
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changeset
|
595 The second example is suitable for hyper-threading. |
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|
596 </para> |
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|
597 |
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|
598 <para> |
1641
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599 The special value <literal>auto</literal> (1.9.10) allows |
c0d1026e7e7b
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diff
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|
600 binding worker processes automatically to available CPUs: |
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601 <example> |
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602 worker_processes auto; |
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|
603 worker_cpu_affinity auto; |
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|
604 </example> |
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|
605 The optional mask parameter can be used to limit the CPUs |
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|
606 available for automatic binding: |
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|
607 <example> |
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diff
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|
608 worker_cpu_affinity auto 01010101; |
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|
609 </example> |
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610 </para> |
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|
611 |
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|
612 <para> |
469
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|
613 <note> |
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|
614 The directive is only available on FreeBSD and Linux. |
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Documented the "worker_cpu_affinity" directive.
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|
615 </note> |
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Documented the "worker_cpu_affinity" directive.
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|
616 </para> |
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Documented the "worker_cpu_affinity" directive.
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|
617 |
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|
618 </directive> |
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Documented the "worker_cpu_affinity" directive.
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|
619 |
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Documented the "worker_cpu_affinity" directive.
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|
620 |
63
6108fd3217e7
Initial English translation of ngx_core_module.
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|
621 <directive name="worker_priority"> |
271 | 622 <syntax><value>number</value></syntax> |
102
c76a257f3fd4
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|
623 <default>0</default> |
63
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|
624 <context>main</context> |
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|
625 |
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|
626 <para> |
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|
627 Defines the scheduling priority for worker processes like it is |
63
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|
628 done by the <command>nice</command> command: a negative |
271 | 629 <value>number</value> |
63
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|
630 means higher priority. |
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|
631 Allowed range normally varies from -20 to 20. |
6108fd3217e7
Initial English translation of ngx_core_module.
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|
632 </para> |
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parents:
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changeset
|
633 |
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Initial English translation of ngx_core_module.
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diff
changeset
|
634 <para> |
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Initial English translation of ngx_core_module.
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diff
changeset
|
635 Example: |
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Initial English translation of ngx_core_module.
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diff
changeset
|
636 <example> |
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changeset
|
637 worker_priority -10; |
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changeset
|
638 </example> |
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|
639 </para> |
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diff
changeset
|
640 |
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Initial English translation of ngx_core_module.
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diff
changeset
|
641 </directive> |
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Initial English translation of ngx_core_module.
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changeset
|
642 |
6108fd3217e7
Initial English translation of ngx_core_module.
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diff
changeset
|
643 |
6108fd3217e7
Initial English translation of ngx_core_module.
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diff
changeset
|
644 <directive name="worker_processes"> |
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Documented the recently added "auto" parameter of the
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|
645 <syntax><value>number</value> | <literal>auto</literal></syntax> |
102
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|
646 <default>1</default> |
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647 <context>main</context> |
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|
648 |
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|
649 <para> |
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|
650 Defines the number of worker processes. |
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|
651 </para> |
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|
652 |
226
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|
653 <para> |
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|
654 The optimal value depends on many factors including (but not |
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|
655 limited to) the number of CPU cores, the number of hard disk |
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|
656 drives that store data, and load pattern. |
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|
657 When one is in doubt, setting it to the number of available CPU cores |
740
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Documented the recently added "auto" parameter of the
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parents:
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diff
changeset
|
658 would be a good start (the value “<literal>auto</literal>” |
46d70031bea9
Documented the recently added "auto" parameter of the
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parents:
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diff
changeset
|
659 will try to autodetect it). |
742
3a2e35f4c279
Documented that "worker_processes auto" appeared in version 1.3.8.
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|
660 <note> |
3a2e35f4c279
Documented that "worker_processes auto" appeared in version 1.3.8.
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diff
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|
661 The <literal>auto</literal> parameter is supported starting from |
764
f8434fdd3cd9
The "auto" parameter of the ""worker_processes" directive
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750
diff
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|
662 versions 1.3.8 and 1.2.5. |
742
3a2e35f4c279
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diff
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|
663 </note> |
226
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664 </para> |
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|
665 |
63
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|
666 </directive> |
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|
667 |
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|
668 |
82
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669 <directive name="worker_rlimit_core"> |
271 | 670 <syntax><value>size</value></syntax> |
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671 <default/> |
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672 <context>main</context> |
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673 |
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674 <para> |
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675 Changes the limit on the largest size of a core file |
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676 (<c-def>RLIMIT_CORE</c-def>) for worker processes. |
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677 Used to increase the limit without restarting the main process. |
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678 </para> |
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679 |
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680 </directive> |
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681 |
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682 |
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683 <directive name="worker_rlimit_nofile"> |
271 | 684 <syntax><value>number</value></syntax> |
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685 <default/> |
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686 <context>main</context> |
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687 |
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688 <para> |
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689 Changes the limit on the maximum number of open files |
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690 (<c-def>RLIMIT_NOFILE</c-def>) for worker processes. |
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691 Used to increase the limit without restarting the main process. |
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692 </para> |
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693 |
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694 </directive> |
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695 |
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696 |
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697 <directive name="working_directory"> |
271 | 698 <syntax><value>directory</value></syntax> |
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699 <default/> |
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700 <context>main</context> |
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701 |
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702 <para> |
957
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703 Defines the current working directory for a worker process. |
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704 It is primarily used when writing a core-file, in which case |
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705 a worker process should have write permission for the |
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706 specified directory. |
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707 </para> |
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708 |
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709 </directive> |
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710 |
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711 </section> |
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712 |
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713 </module> |