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author Ruslan Ermilov <ru@nginx.com>
date Thu, 15 Sep 2011 08:33:25 +0000
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1 <html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><title>Core Module</title></head><body><center><h3>Core Module</h3></center><a name="example"></a><center><h4>Example Configuration</h4></center><p><blockquote><pre>
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2 user www www;
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3 worker_processes 2;
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4
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5 error_log /var/log/nginx-error.log info;
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6
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7 events {
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8 use kqueue;
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9 worker_connections 2048;
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10 }
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11
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12 ...
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13 </pre></blockquote></p><a name="directives"></a><center><h4>Directives</h4></center><hr><a name="daemon"></a><strong>syntax</strong>:
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14 <code>daemon <code>on</code> | <code>off</code></code><br><strong>default</strong>:
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15 <code>daemon on</code><br><strong>context</strong>:
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16 <code>main</code><br><p>
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17 Determines whether nginx should become a daemon.
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18 Mainly used during development.
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19 </p><hr><a name="env"></a><strong>syntax</strong>:
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20 <code>env <code><i>VAR</i></code>[=<code><i>VALUE</i></code>]</code><br><strong>default</strong>:
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21 <code>env TZ</code><br><strong>context</strong>:
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22 <code>main</code><br><p>
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23 Allows to limit a set of environment variables, change their values,
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24 or create new environment variables, for the following cases:
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25 <ul><li>
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26 variable inheritance during a
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27 <a href="control.html#upgrade">live upgrade</a>
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28 of an executable file;
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29 </li><li>
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30 use of variables by the module
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31 <a href="http/ngx_http_perl_module.html">ngx_http_perl_module</a>;
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32 </li><li>
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33 use of variables by worker processes.
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34 Please bear in mind that controlling system libraries in this way
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35 is not always possible as it is not uncommon for libraries to check
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36 variables only during initialization, well before they can be set
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37 using this directive.
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38 An exception from this is an above mentioned
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39 <a href="control.html#upgrade">live upgrade</a>
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40 of an executable file.
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41 </li></ul></p><p>
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42 The TZ variable is always inherited and made available to the module
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43 <a href="http/ngx_http_perl_module.html">ngx_http_perl_module</a>,
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44 unless configured explicitly.
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45 </p><p>
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46 Usage example:
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47 <blockquote><pre>
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48 env MALLOC_OPTIONS;
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49 env PERL5LIB=/data/site/modules;
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50 env OPENSSL_ALLOW_PROXY_CERTS=1;
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51 </pre></blockquote></p><hr><a name="include"></a><strong>syntax</strong>:
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52 <code>include <code><i>file</i></code> | <code><i>mask</i></code></code><br><strong>default</strong>:
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53 <strong>none</strong><br><strong>context</strong>:
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54 <strong>any</strong><br><p>
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55 Includes another <code><i>file</i></code>, or files matching the
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56 specified <code><i>mask</i></code>, into configuration.
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57 Included files should consist of
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58 syntactically correct directives and blocks.
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59 </p><p>
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60 Usage example:
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61 <blockquote><pre>
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62 include mime.types;
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63 include vhosts/*.conf;
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64 </pre></blockquote></p><hr><a name="master_process"></a><strong>syntax</strong>:
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65 <code>master_process <code>on</code> | <code>off</code></code><br><strong>default</strong>:
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66 <code>master_process on</code><br><strong>context</strong>:
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67 <code>main</code><br><p>
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68 Determines whether worker processes are started.
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69 This directive is intended for nginx developers.
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70 </p><hr><a name="pid"></a><strong>syntax</strong>:
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71 <code>pid <code><i>file</i></code></code><br><strong>default</strong>:
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72 <code>pid nginx.pid</code><br><strong>context</strong>:
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73 <code>main</code><br><p>
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74 Defines a <code><i>file</i></code> which will store the process ID of the main process.
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75 </p><hr><a name="ssl_engine"></a><strong>syntax</strong>:
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76 <code>ssl_engine <code><i>device</i></code></code><br><strong>default</strong>:
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77 <strong>none</strong><br><strong>context</strong>:
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78 <code>main</code><br><p>
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79 Defines the name of the hardware SSL accelerator.
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80 </p><hr><a name="user"></a><strong>syntax</strong>:
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81 <code>user <code><i>user</i></code> [<code><i>group</i></code>]</code><br><strong>default</strong>:
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82 <code>user nobody nobody</code><br><strong>context</strong>:
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83 <code>main</code><br><p>
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84 Defines <code><i>user</i></code> and <code><i>group</i></code>
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85 credentials used by worker processes.
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86 If <code><i>group</i></code> is omitted, a group whose name equals
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87 that of <code><i>user</i></code> is used.
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88 </p><hr><a name="timer_resolution"></a><strong>syntax</strong>:
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89 <code>timer_resolution <code><i>interval</i></code></code><br><strong>default</strong>:
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90 <strong>none</strong><br><strong>context</strong>:
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91 <code>main</code><br><p>
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92 Reduces timer resolution in worker processes, thus reducing the
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93 number of <code>gettimeofday()</code> system calls made.
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94 By default, <code>gettimeofday()</code> is called each time
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95 on receiving a kernel event.
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96 With reduced resolution, <code>gettimeofday()</code> is only
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97 called once per specified <code><i>interval</i></code>.
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98 </p><p>
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99 Example:
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100 <blockquote><pre>
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101 timer_resolution 100ms;
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102 </pre></blockquote></p><p>
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103 An internal implementation of interval depends on the method used:
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104 <ul><li>
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105 an <code>EVFILT_TIMER</code> filter if <code>kqueue</code> is used;
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106 </li><li><code>timer_create()</code> if <code>eventport</code> is used;
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107 </li><li><code>setitimer()</code> otherwise.
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108 </li></ul></p><hr><a name="worker_rlimit_core"></a><strong>syntax</strong>:
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109 <code>worker_rlimit_core <code><i>size</i></code></code><br><strong>default</strong>:
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110 <strong>none</strong><br><strong>context</strong>:
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111 <code>main</code><br><p>
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112 Changes the limit on the largest size of a core file
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113 (<code>RLIMIT_CORE</code>) for worker processes.
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114 Used to increase the limit without restarting the main process.
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115 </p><hr><a name="worker_rlimit_nofile"></a><strong>syntax</strong>:
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116 <code>worker_rlimit_nofile <code><i>number</i></code></code><br><strong>default</strong>:
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117 <strong>none</strong><br><strong>context</strong>:
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118 <code>main</code><br><p>
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119 Changes the limit on the maximum number of open files
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120 (<code>RLIMIT_NOFILE</code>) for worker processes.
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121 Used to increase the limit without restarting the main process.
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122 </p><hr><a name="worker_priority"></a><strong>syntax</strong>:
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123 <code>worker_priority <code><i>number</i></code></code><br><strong>default</strong>:
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124 <code>worker_priority 0</code><br><strong>context</strong>:
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125 <code>main</code><br><p>
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126 Defines a scheduling priority for worker processes like is
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127 done by the <code>nice</code>: a negative
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128 <code><i>number</i></code>
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129 means higher priority.
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130 Allowed range normally varies from -20 to 20.
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131 </p><p>
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132 Example:
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133 <blockquote><pre>
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134 worker_priority -10;
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135 </pre></blockquote></p><hr><a name="worker_processes"></a><strong>syntax</strong>:
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136 <code>worker_processes <code><i>number</i></code></code><br><strong>default</strong>:
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137 <code>worker_processes 1</code><br><strong>context</strong>:
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138 <code>main</code><br><p>
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139 Defines the number of worker processes.
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140 </p><hr><a name="working_directory"></a><strong>syntax</strong>:
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141 <code>working_directory <code><i>directory</i></code></code><br><strong>default</strong>:
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142 <strong>none</strong><br><strong>context</strong>:
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143 <code>main</code><br><p>
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144 Defines a current working directory for a worker process.
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145 It is primarily used when writing a core-file, in which case
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146 a working process should have write permission for the
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147 specified directory.
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148 </p></body></html>