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annotate docs/html/ngx_core_module.html @ 4069:4dbdfd985863
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author | Ruslan Ermilov <ru@nginx.com> |
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date | Mon, 05 Sep 2011 09:40:50 +0000 |
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rev | line source |
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1 <html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><title>Core Module</title></head><body><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 <u>live upgrade</u> |
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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 |
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31 <u>http_perl</u> |
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32 module; |
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33 </li><li> |
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34 use of variables by worker processes. |
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35 Please bear in mind that controlling system libraries in this way |
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36 isn't always possible as it's not uncommon for libraries to check |
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37 variables only during initialization, well before they can be set |
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38 using this directive. |
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39 An exception from this is an above mentioned |
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40 <u>live upgrade</u> |
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41 of an executable file. |
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42 </li></ul></p><p> |
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43 The TZ variable is always inherited and made available to the |
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44 <u>http_perl</u> |
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45 module, unless configured explicitly. |
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46 </p><p> |
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47 Usage example: |
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48 <blockquote><pre> |
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49 env MALLOC_OPTIONS; |
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50 env PERL5LIB=/data/site/modules; |
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51 env OPENSSL_ALLOW_PROXY_CERTS=1; |
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52 </pre></blockquote></p><hr><a name="include"></a><strong>syntax</strong>: |
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53 <code>include <code><i>file</i></code> | <code><i>mask</i></code></code><br><strong>default</strong>: |
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54 <strong>none</strong><br><strong>context</strong>: |
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55 <strong>any</strong><br><p> |
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56 Includes another <code><i>file</i></code>, or files matching the |
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57 specified <code><i>mask</i></code>, into configuration. |
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58 Included files should consist of |
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59 syntactically correct directives and blocks. |
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60 </p><p> |
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61 Usage example: |
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62 <blockquote><pre> |
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63 include mime.types; |
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64 include vhosts/*.conf; |
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65 </pre></blockquote></p><hr><a name="master_process"></a><strong>syntax</strong>: |
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66 <code>master_process <code>on</code> | <code>off</code></code><br><strong>default</strong>: |
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67 <code>master_process on</code><br><strong>context</strong>: |
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68 <code>main</code><br><p> |
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69 Determines whether worker processes are started. |
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70 This directive is intended for nginx developers. |
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71 </p><hr><a name="pid"></a><strong>syntax</strong>: |
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72 <code>pid <code><i>file</i></code></code><br><strong>default</strong>: |
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73 <code>pid nginx.pid</code><br><strong>context</strong>: |
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74 <code>main</code><br><p> |
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75 Defines a <code><i>file</i></code> which will store the process ID of the main process. |
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76 </p><hr><a name="ssl_engine"></a><strong>syntax</strong>: |
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77 <code>ssl_engine <code><i>device</i></code></code><br><strong>default</strong>: |
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78 <strong>none</strong><br><strong>context</strong>: |
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79 <code>main</code><br><p> |
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80 Defines the name of the hardware SSL accelerator. |
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81 </p><hr><a name="user"></a><strong>syntax</strong>: |
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82 <code>user <code><i>user</i></code> [<code><i>group</i></code>]</code><br><strong>default</strong>: |
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83 <code>user nobody nobody</code><br><strong>context</strong>: |
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84 <code>main</code><br><p> |
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85 Defines <code><i>user</i></code> and <code><i>group</i></code> |
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86 credentials used by worker processes. |
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87 If <code><i>group</i></code> is omitted, a group whose name equals |
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88 that of <code><i>user</i></code> is used. |
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89 </p><hr><a name="timer_resolution"></a><strong>syntax</strong>: |
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90 <code>timer_resolution <code><i>interval</i></code></code><br><strong>default</strong>: |
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91 <strong>none</strong><br><strong>context</strong>: |
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92 <code>main</code><br><p> |
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93 Reduces timer resolution in worker processes, thus reducing the |
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94 number of <code>gettimeofday()</code> system calls made. |
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95 By default, <code>gettimeofday()</code> is called each time |
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96 on receiving a kernel event. |
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97 With reduced resolution, <code>gettimeofday()</code> is only |
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98 called once per specified <code><i>interval</i></code>. |
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99 </p><p> |
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100 Example: |
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101 <blockquote><pre> |
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102 timer_resolution 100ms; |
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103 </pre></blockquote></p><p> |
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104 An internal implementation of interval depends on the method used: |
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105 <ul><li> |
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106 an <code>EVFILT_TIMER</code> filter if <code>kqueue</code> is used; |
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107 </li><li><code>timer_create()</code> if <code>eventport</code> is used; |
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108 </li><li><code>setitimer()</code> otherwise. |
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109 </li></ul></p><hr><a name="worker_rlimit_core"></a><strong>syntax</strong>: |
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110 <code>worker_rlimit_core <code><i>size</i></code></code><br><strong>default</strong>: |
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111 <strong>none</strong><br><strong>context</strong>: |
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112 <code>main</code><br><p> |
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113 Changes the limit on the largest size of a core file |
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114 (<code>RLIMIT_CORE</code>) for worker processes. |
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115 Used to increase the limit without restarting the main process. |
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116 </p><hr><a name="worker_rlimit_nofile"></a><strong>syntax</strong>: |
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117 <code>worker_rlimit_nofile <code><i>number</i></code></code><br><strong>default</strong>: |
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118 <strong>none</strong><br><strong>context</strong>: |
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119 <code>main</code><br><p> |
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120 Changes the limit on the maximum number of open files |
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121 (<code>RLIMIT_NOFILE</code>) for worker processes. |
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122 Used to increase the limit without restarting the main process. |
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123 </p><hr><a name="worker_priority"></a><strong>syntax</strong>: |
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124 <code>worker_priority <code><i>number</i></code></code><br><strong>default</strong>: |
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125 <code>worker_priority 0</code><br><strong>context</strong>: |
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126 <code>main</code><br><p> |
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127 Defines a scheduling priority for worker processes like is |
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128 done by the <code>nice</code>: a negative |
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129 <code><i>number</i></code> |
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130 means higher priority. |
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131 Allowed range normally varies from -20 to 20. |
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132 </p><p> |
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133 Example: |
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134 <blockquote><pre> |
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135 worker_priority -10; |
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136 </pre></blockquote></p><hr><a name="worker_processes"></a><strong>syntax</strong>: |
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137 <code>worker_processes <code><i>number</i></code></code><br><strong>default</strong>: |
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138 <code>worker_processes 1</code><br><strong>context</strong>: |
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139 <code>main</code><br><p> |
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140 Defines the number of worker processes. |
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141 </p><hr><a name="working_directory"></a><strong>syntax</strong>: |
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142 <code>working_directory <code><i>directory</i></code></code><br><strong>default</strong>: |
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143 <strong>none</strong><br><strong>context</strong>: |
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144 <code>main</code><br><p> |
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145 Defines a current working directory for a worker process. |
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146 It's primarily used for writing a core-file, in which case |
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147 a working process should have write permission for the |
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148 specified directory. |
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149 </p></body></html> |