Mercurial > hg > nginx-site
annotate xml/en/docs/ngx_core_module.xml @ 1466:564bfa1ef994
Clarify that our syslog logging talks over UDP.
author | Ruslan Ermilov <ru@nginx.com> |
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date | Fri, 24 Apr 2015 10:29:58 +0300 |
parents | eea7541e7c6a |
children | d1e1a8d34bce |
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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="14"> |
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> |
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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. | |
516
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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> |
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142 <value>file</value> | <literal>stderr</literal> | |
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143 <literal>syslog:</literal><literal>server</literal>=<value>address</value>[,<value>parameter</value>=<value>value</value>] | |
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144 <literal>memory:</literal><value>size</value> |
271 | 145 [<literal>debug</literal> | |
146 <literal>info</literal> | | |
147 <literal>notice</literal> | | |
148 <literal>warn</literal> | | |
149 <literal>error</literal> | | |
150 <literal>crit</literal> | | |
151 <literal>alert</literal> | | |
152 <literal>emerg</literal>]</syntax> | |
158
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153 <default>logs/error.log error</default> |
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154 <context>main</context> |
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155 <context>http</context> |
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156 <context>stream</context> |
158
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157 <context>server</context> |
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158 <context>location</context> |
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159 |
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160 <para> |
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161 Configures logging. |
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162 Several logs can be specified on the same level (1.5.2). |
158
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163 </para> |
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164 |
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165 <para> |
271 | 166 The first parameter defines a file that will store the log. |
158
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167 <!-- |
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168 If filename is not absolute, it is prefixed with the prefix path. |
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169 --> |
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170 The special value <literal>stderr</literal> selects the standard error file. |
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171 Logging to <link doc="syslog.xml">syslog</link> can be configured by specifying |
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172 the “<literal>syslog:</literal>” prefix. |
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173 Logging to a |
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174 <link doc="debugging_log.xml" id="memory">cyclic memory buffer</link> |
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175 can be configured by specifying the “<literal>memory:</literal>” prefix and |
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176 buffer <value>size</value>, and is generally used for debugging (1.7.11). |
158
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177 </para> |
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178 |
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179 <para> |
271 | 180 The second parameter determines the level of logging. |
158
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181 Log levels above are listed in the order of increasing severity. |
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182 Setting a certain log level will cause all messages of |
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183 the specified and more severe log levels to be logged. |
271 | 184 For example, the default level <literal>error</literal> will |
185 cause <literal>error</literal>, <literal>crit</literal>, | |
186 <literal>alert</literal>, and <literal>emerg</literal> messages | |
158
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187 to be logged. |
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188 If this parameter is omitted then <literal>error</literal> is used. |
158
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189 <note> |
271 | 190 For <literal>debug</literal> logging to work, nginx needs to |
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191 be built with <literal>--with-debug</literal>, |
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192 see “<link doc="debugging_log.xml"/>”. |
158
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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>stream</literal> level |
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198 starting from version 1.7.11. |
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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; |
63
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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 |
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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="lock_file"> |
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304 <syntax><value>file</value></syntax> |
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305 <default>logs/nginx.lock</default> |
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306 <context>main</context> |
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307 |
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308 <para> |
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309 nginx uses the locking mechanism to implement <link id="accept_mutex"/> |
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310 and serialize access to shared memory. |
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311 On most systems the locks are implemented using atomic operations, |
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312 and this directive is ignored. |
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313 On other systems the “lock file” mechanism is used. |
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314 This directive specifies a prefix for the names of lock files. |
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315 </para> |
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316 |
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317 </directive> |
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318 |
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319 |
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320 <directive name="master_process"> |
271 | 321 <syntax><literal>on</literal> | <literal>off</literal></syntax> |
102
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322 <default>on</default> |
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323 <context>main</context> |
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324 |
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325 <para> |
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326 Determines whether worker processes are started. |
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327 This directive is intended for nginx developers. |
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328 </para> |
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329 |
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330 </directive> |
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331 |
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332 |
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333 <directive name="multi_accept"> |
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334 <syntax><literal>on</literal> | <literal>off</literal></syntax> |
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335 <default>off</default> |
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336 <context>events</context> |
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337 |
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338 <para> |
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339 If <literal>multi_accept</literal> is disabled, a worker process |
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340 will accept one new connection at a time. |
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341 Otherwise, a worker process |
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342 will accept all new connections at a time. |
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343 <note> |
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344 The directive is ignored if <link doc="events.xml" id="kqueue"/> |
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345 connection processing method is used, because it reports |
571
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346 the number of new connections waiting to be accepted. |
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347 </note> |
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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 |
289
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353 <directive name="pcre_jit"> |
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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>main</context> |
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357 <appeared-in>1.1.12</appeared-in> |
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358 |
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359 <para> |
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360 Enables or disables the use of “just-in-time compilation” (PCRE JIT) |
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361 for the regular expressions known by the time of configuration parsing. |
289
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362 </para> |
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363 |
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364 <para> |
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365 PCRE JIT can speed up processing of regular expressions significantly. |
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366 <note> |
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367 The JIT is available in PCRE libraries starting from version 8.20 |
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368 built with the <literal>--enable-jit</literal> configuration parameter. |
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369 When the PCRE library is built with nginx (<literal>--with-pcre=</literal>), |
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370 the JIT support is enabled via the |
289
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371 <literal>--with-pcre-jit</literal> configuration parameter. |
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372 </note> |
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373 </para> |
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374 |
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375 </directive> |
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376 |
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377 |
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378 <directive name="pid"> |
271 | 379 <syntax><value>file</value></syntax> |
102
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380 <default>nginx.pid</default> |
63
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381 <context>main</context> |
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382 |
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383 <para> |
271 | 384 Defines a <value>file</value> that will store the process ID of the main process. |
63
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385 </para> |
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386 |
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387 </directive> |
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388 |
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389 |
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390 <directive name="ssl_engine"> |
271 | 391 <syntax><value>device</value></syntax> |
63
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392 <default/> |
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393 <context>main</context> |
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394 |
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395 <para> |
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396 Defines the name of the hardware SSL accelerator. |
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397 </para> |
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398 |
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399 </directive> |
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400 |
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401 |
1436 | 402 <directive name="thread_pool"> |
403 <syntax> | |
404 <value>name</value> | |
405 <literal>threads</literal>=<value>number</value> | |
406 [<literal>max_queue</literal>=<value>number</value>]</syntax> | |
407 <default>default threads=32 max_queue=65536</default> | |
408 <context>main</context> | |
409 <appeared-in>1.7.11</appeared-in> | |
410 | |
411 <para> | |
412 Defines named thread pools | |
413 used for multi-threaded reading and sending of files | |
414 <link doc="http/ngx_http_core_module.xml" id="aio">without blocking</link> | |
415 worker processes. | |
416 </para> | |
417 | |
418 <para> | |
419 The <literal>threads</literal> parameter | |
420 defines the number of threads in the pool. | |
421 </para> | |
422 | |
423 <para> | |
424 In the event that all threads in the pool are busy, | |
425 a new task will wait in the queue. | |
426 The <literal>max_queue</literal> parameter limits the number | |
427 of tasks allowed to be waiting in the queue. | |
428 By default, up to 65536 tasks can wait in the queue. | |
429 When the queue overflows, the task is completed with an error. | |
430 </para> | |
431 | |
432 </directive> | |
433 | |
434 | |
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435 <directive name="timer_resolution"> |
271 | 436 <syntax><value>interval</value></syntax> |
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437 <default/> |
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438 <context>main</context> |
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439 |
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440 <para> |
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441 Reduces timer resolution in worker processes, thus reducing the |
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442 number of <c-func>gettimeofday</c-func> system calls made. |
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443 By default, <c-func>gettimeofday</c-func> is called each time |
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444 a kernel event is received. |
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445 With reduced resolution, <c-func>gettimeofday</c-func> is only |
271 | 446 called once per specified <value>interval</value>. |
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447 </para> |
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448 |
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449 <para> |
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450 Example: |
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451 <example> |
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452 timer_resolution 100ms; |
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453 </example> |
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454 </para> |
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455 |
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456 <para> |
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457 Internal implementation of the interval depends on the method used: |
63
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458 <list type="bullet"> |
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459 |
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460 <listitem> |
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461 the <c-def>EVFILT_TIMER</c-def> filter if <literal>kqueue</literal> is used; |
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462 </listitem> |
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463 |
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464 <listitem> |
271 | 465 <c-func>timer_create</c-func> if <literal>eventport</literal> is used; |
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466 </listitem> |
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467 |
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468 <listitem> |
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469 <c-func>setitimer</c-func> otherwise. |
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470 </listitem> |
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471 |
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472 </list> |
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473 </para> |
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474 |
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475 </directive> |
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476 |
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477 |
556
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478 <directive name="use"> |
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479 <syntax><value>method</value></syntax> |
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480 <default/> |
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481 <context>events</context> |
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482 |
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483 <para> |
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484 Specifies the <link doc="events.xml">connection processing</link> |
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485 <value>method</value> to use. |
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486 There is normally no need to specify it explicitly, because nginx will |
556
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487 by default use the most efficient method. |
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488 </para> |
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489 |
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490 </directive> |
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491 |
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492 |
82
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493 <directive name="user"> |
271 | 494 <syntax><value>user</value> [<value>group</value>]</syntax> |
102
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495 <default>nobody nobody</default> |
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496 <context>main</context> |
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497 |
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498 <para> |
271 | 499 Defines <value>user</value> and <value>group</value> |
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500 credentials used by worker processes. |
271 | 501 If <value>group</value> is omitted, a group whose name equals |
502 that of <value>user</value> is used. | |
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503 </para> |
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504 |
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505 </directive> |
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506 |
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507 |
749
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508 <directive name="worker_aio_requests"> |
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509 <syntax><value>number</value></syntax> |
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510 <default>32</default> |
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511 <context>events</context> |
750
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512 <appeared-in>1.1.4</appeared-in> |
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513 <appeared-in>1.0.7</appeared-in> |
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514 |
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515 <para> |
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516 When using <link doc="http/ngx_http_core_module.xml" id="aio"/> |
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517 with the <link doc="../docs/events.xml" id="epoll"/> |
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518 connection processing method, sets the maximum <value>number</value> of |
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519 outstanding asynchronous I/O operations |
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520 for a single worker process. |
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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 |
545
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526 <directive name="worker_connections"> |
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527 <syntax><value>number</value></syntax> |
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528 <default>512</default> |
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529 <context>events</context> |
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530 |
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531 <para> |
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532 Sets the maximum number of simultaneous connections that |
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533 can be opened by a worker process. |
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534 </para> |
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535 |
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536 <para> |
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537 It should be kept in mind that this number includes all connections |
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538 (e.g. connections with proxied servers, among others), |
545
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539 not only connections with clients. |
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540 Another consideration is that the actual number of simultaneous |
966 | 541 connections cannot exceed the current limit on |
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542 the maximum number of open files, which can be changed by |
545
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543 <link id="worker_rlimit_nofile"/>. |
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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_cpu_affinity"> |
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550 <syntax><value>cpumask</value> ...</syntax> |
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551 <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 Binds worker processes to the sets of CPUs. |
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556 Each CPU set is represented by a bitmask of allowed CPUs. |
469
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557 There should be a separate set defined for each of the worker processes. |
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558 By default, worker processes are not bound to any specific CPUs. |
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559 </para> |
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560 |
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561 <para> |
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562 For example, |
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563 <example> |
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564 worker_processes 4; |
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565 worker_cpu_affinity 0001 0010 0100 1000; |
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566 </example> |
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567 binds each worker process to a separate CPU, while |
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568 <example> |
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569 worker_processes 2; |
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570 worker_cpu_affinity 0101 1010; |
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571 </example> |
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572 binds the first worker process to CPU0/CPU2, |
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573 and the second worker process to CPU1/CPU3. |
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574 The second example is suitable for hyper-threading. |
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575 </para> |
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576 |
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577 <para> |
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578 <note> |
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579 The directive is only available on FreeBSD and Linux. |
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580 </note> |
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581 </para> |
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582 |
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583 </directive> |
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584 |
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585 |
63
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586 <directive name="worker_priority"> |
271 | 587 <syntax><value>number</value></syntax> |
102
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588 <default>0</default> |
63
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589 <context>main</context> |
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590 |
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591 <para> |
957
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592 Defines the scheduling priority for worker processes like it is |
63
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593 done by the <command>nice</command> command: a negative |
271 | 594 <value>number</value> |
63
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595 means higher priority. |
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596 Allowed range normally varies from -20 to 20. |
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597 </para> |
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598 |
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599 <para> |
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600 Example: |
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|
601 <example> |
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602 worker_priority -10; |
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603 </example> |
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604 </para> |
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|
605 |
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|
606 </directive> |
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|
607 |
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|
608 |
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609 <directive name="worker_processes"> |
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610 <syntax><value>number</value> | <literal>auto</literal></syntax> |
102
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611 <default>1</default> |
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612 <context>main</context> |
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|
613 |
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|
614 <para> |
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615 Defines the number of worker processes. |
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|
616 </para> |
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617 |
226
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|
618 <para> |
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619 The optimal value depends on many factors including (but not |
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620 limited to) the number of CPU cores, the number of hard disk |
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621 drives that store data, and load pattern. |
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622 When one is in doubt, setting it to the number of available CPU cores |
740
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623 would be a good start (the value “<literal>auto</literal>” |
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|
624 will try to autodetect it). |
742
3a2e35f4c279
Documented that "worker_processes auto" appeared in version 1.3.8.
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625 <note> |
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|
626 The <literal>auto</literal> parameter is supported starting from |
764
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627 versions 1.3.8 and 1.2.5. |
742
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628 </note> |
226
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629 </para> |
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630 |
63
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631 </directive> |
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|
632 |
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633 |
82
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634 <directive name="worker_rlimit_core"> |
271 | 635 <syntax><value>size</value></syntax> |
82
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636 <default/> |
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637 <context>main</context> |
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|
638 |
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|
639 <para> |
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|
640 Changes the limit on the largest size of a core file |
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641 (<c-def>RLIMIT_CORE</c-def>) for worker processes. |
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642 Used to increase the limit without restarting the main process. |
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643 </para> |
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|
644 |
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|
645 </directive> |
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|
646 |
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|
647 |
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648 <directive name="worker_rlimit_nofile"> |
271 | 649 <syntax><value>number</value></syntax> |
82
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650 <default/> |
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diff
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|
651 <context>main</context> |
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|
652 |
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diff
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|
653 <para> |
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diff
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|
654 Changes the limit on the maximum number of open files |
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|
655 (<c-def>RLIMIT_NOFILE</c-def>) for worker processes. |
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|
656 Used to increase the limit without restarting the main process. |
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|
657 </para> |
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|
658 |
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diff
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|
659 </directive> |
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diff
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|
660 |
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diff
changeset
|
661 |
63
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662 <directive name="working_directory"> |
271 | 663 <syntax><value>directory</value></syntax> |
63
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664 <default/> |
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|
665 <context>main</context> |
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|
666 |
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|
667 <para> |
957
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|
668 Defines the current working directory for a worker process. |
63
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|
669 It is primarily used when writing a core-file, in which case |
262
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Changed one instance of "working process" to "worker process".
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|
670 a worker process should have write permission for the |
63
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|
671 specified directory. |
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|
672 </para> |
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|
673 |
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|
674 </directive> |
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|
675 |
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|
676 </section> |
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|
677 |
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|
678 </module> |