Mercurial > hg > nginx-site
annotate xml/en/docs/ngx_core_module.xml @ 444:43c84d19bf92
Added a note about the NGINX environment variable.
author | Ruslan Ermilov <ru@nginx.com> |
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date | Mon, 12 Mar 2012 12:32:04 +0000 |
parents | df261b1ce71f |
children | 571b790ddf9e |
rev | line source |
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1 <?xml version="1.0"?> |
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2 |
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3 <!DOCTYPE module SYSTEM "../../../dtd/module.dtd"> |
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4 |
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5 <module name="Core functionality" |
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6 link="/en/docs/ngx_core_module.html" |
98 | 7 lang="en"> |
63
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8 |
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9 <section id="example" name="Example Configuration"> |
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10 |
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11 <para> |
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12 <example> |
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13 user www www; |
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14 worker_processes 2; |
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15 |
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16 error_log /var/log/nginx-error.log info; |
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17 |
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18 events { |
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19 use kqueue; |
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20 worker_connections 2048; |
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21 } |
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22 |
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23 ... |
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24 </example> |
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25 </para> |
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26 |
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27 </section> |
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28 |
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29 |
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30 <section id="directives" name="Directives"> |
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31 |
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32 <directive name="daemon"> |
271 | 33 <syntax><literal>on</literal> | <literal>off</literal></syntax> |
102
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34 <default>on</default> |
63
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35 <context>main</context> |
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36 |
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37 <para> |
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38 Determines whether nginx should become a daemon. |
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39 Mainly used during development. |
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40 </para> |
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41 |
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42 </directive> |
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43 |
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44 |
158
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45 <directive name="error_log"> |
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46 <syntax> |
271 | 47 <value>file</value> |
48 [<literal>debug</literal> | | |
49 <literal>info</literal> | | |
50 <literal>notice</literal> | | |
51 <literal>warn</literal> | | |
52 <literal>error</literal> | | |
53 <literal>crit</literal> | | |
54 <literal>alert</literal> | | |
55 <literal>emerg</literal>]</syntax> | |
158
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56 <default>logs/error.log error</default> |
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57 <context>main</context> |
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58 <context>http</context> |
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59 <context>server</context> |
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60 <context>location</context> |
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61 |
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62 <para> |
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63 Configures logging. |
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64 </para> |
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65 |
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66 <para> |
271 | 67 The first parameter defines a file that will store the log. |
158
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68 <!-- |
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69 If filename is not absolute, it is prefixed with the prefix path. |
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70 --> |
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71 </para> |
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72 |
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73 <para> |
271 | 74 The second parameter determines the level of logging. |
158
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75 Log levels above are listed in the order of increasing severity. |
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76 Setting a certain log level will cause all messages of |
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77 the specified and more severe log levels to be logged. |
271 | 78 For example, the default level <literal>error</literal> will |
79 cause <literal>error</literal>, <literal>crit</literal>, | |
80 <literal>alert</literal>, and <literal>emerg</literal> messages | |
158
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81 to be logged. |
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82 <note> |
271 | 83 For <literal>debug</literal> logging to work, nginx needs to |
84 be built with <literal>--with-debug</literal>. | |
158
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85 </note> |
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86 </para> |
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87 |
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88 </directive> |
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89 |
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90 |
63
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91 <directive name="env"> |
271 | 92 <syntax><value>variable</value>[=<value>value</value>]</syntax> |
102
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93 <default>TZ</default> |
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94 <context>main</context> |
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95 |
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96 <para> |
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97 Allows to limit a set of environment variables, change their values, |
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98 or create new environment variables, for the following cases: |
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99 <list type="bullet"> |
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100 |
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101 <listitem> |
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102 variable inheritance during a |
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103 <link doc="control.xml" id="upgrade">live upgrade</link> |
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104 of an executable file; |
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105 </listitem> |
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106 |
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107 <listitem> |
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108 use of variables by the module |
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109 <link doc="http/ngx_http_perl_module.xml">ngx_http_perl_module</link>; |
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110 </listitem> |
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111 |
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112 <listitem> |
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113 use of variables by worker processes. |
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114 Please bear in mind that controlling system libraries in this way |
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115 is not always possible as it is not uncommon for libraries to check |
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116 variables only during initialization, well before they can be set |
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117 using this directive. |
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118 An exception from this is an above mentioned |
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119 <link doc="control.xml" id="upgrade">live upgrade</link> |
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120 of an executable file. |
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121 </listitem> |
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122 |
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123 </list> |
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124 </para> |
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125 |
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126 <para> |
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127 The TZ variable is always inherited and made available to the module |
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128 <link doc="http/ngx_http_perl_module.xml">ngx_http_perl_module</link>, |
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129 unless configured explicitly. |
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130 </para> |
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131 |
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132 <para> |
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133 Usage example: |
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134 <example> |
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135 env MALLOC_OPTIONS; |
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136 env PERL5LIB=/data/site/modules; |
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137 env OPENSSL_ALLOW_PROXY_CERTS=1; |
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138 </example> |
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139 </para> |
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140 |
444
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141 <para> |
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142 <note> |
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143 The NGINX environment variable is used internally by nginx |
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144 and should not be set directly by the user. |
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145 </note> |
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146 </para> |
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147 |
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148 </directive> |
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149 |
249 | 150 |
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151 <directive name="include"> |
271 | 152 <syntax><value>file</value> | <value>mask</value></syntax> |
63
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153 <default/> |
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154 <context/> |
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155 |
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156 <para> |
271 | 157 Includes another <value>file</value>, or files matching the |
158 specified <value>mask</value>, into configuration. | |
63
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159 Included files should consist of |
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160 syntactically correct directives and blocks. |
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161 </para> |
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162 |
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163 <para> |
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164 Usage example: |
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165 <example> |
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166 include mime.types; |
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167 include vhosts/*.conf; |
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168 </example> |
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169 </para> |
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170 |
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171 </directive> |
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172 |
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173 |
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174 <directive name="master_process"> |
271 | 175 <syntax><literal>on</literal> | <literal>off</literal></syntax> |
102
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176 <default>on</default> |
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177 <context>main</context> |
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178 |
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179 <para> |
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180 Determines whether worker processes are started. |
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181 This directive is intended for nginx developers. |
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182 </para> |
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183 |
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184 </directive> |
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185 |
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186 |
289
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187 <directive name="pcre_jit"> |
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188 <syntax><literal>on</literal> | <literal>off</literal></syntax> |
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189 <default>off</default> |
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190 <context>main</context> |
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191 <appeared-in>1.1.12</appeared-in> |
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192 |
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193 <para> |
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194 Enables or disables the use of “just-in-time compilation” (PCRE JIT) |
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195 for regular expressions known at configuration parse time. |
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196 </para> |
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197 |
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198 <para> |
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199 PCRE JIT can speed up processing of regular expressions significantly. |
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200 <note> |
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201 The JIT is available in PCRE libraries starting from version 8.20 |
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202 built with the <literal>--enable-jit</literal> configuration parameter. |
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203 When building the PCRE library with nginx (<literal>--with-pcre=</literal>), |
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204 the JIT support should be enabled with the |
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205 <literal>--with-pcre-jit</literal> configuration parameter. |
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206 </note> |
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207 </para> |
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208 |
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209 </directive> |
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210 |
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211 |
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212 <directive name="pid"> |
271 | 213 <syntax><value>file</value></syntax> |
102
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214 <default>nginx.pid</default> |
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215 <context>main</context> |
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216 |
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217 <para> |
271 | 218 Defines a <value>file</value> that will store the process ID of the main process. |
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219 </para> |
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220 |
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221 </directive> |
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222 |
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223 |
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224 <directive name="ssl_engine"> |
271 | 225 <syntax><value>device</value></syntax> |
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226 <default/> |
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227 <context>main</context> |
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228 |
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229 <para> |
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230 Defines the name of the hardware SSL accelerator. |
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231 </para> |
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232 |
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233 </directive> |
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234 |
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235 |
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236 <directive name="timer_resolution"> |
271 | 237 <syntax><value>interval</value></syntax> |
63
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238 <default/> |
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239 <context>main</context> |
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240 |
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241 <para> |
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242 Reduces timer resolution in worker processes, thus reducing the |
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243 number of <c-func>gettimeofday</c-func> system calls made. |
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244 By default, <c-func>gettimeofday</c-func> is called each time |
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245 on receiving a kernel event. |
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246 With reduced resolution, <c-func>gettimeofday</c-func> is only |
271 | 247 called once per specified <value>interval</value>. |
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248 </para> |
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249 |
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250 <para> |
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251 Example: |
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252 <example> |
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253 timer_resolution 100ms; |
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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 An internal implementation of interval depends on the method used: |
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259 <list type="bullet"> |
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260 |
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261 <listitem> |
271 | 262 an <c-def>EVFILT_TIMER</c-def> filter if <literal>kqueue</literal> is used; |
63
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263 </listitem> |
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264 |
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265 <listitem> |
271 | 266 <c-func>timer_create</c-func> if <literal>eventport</literal> is used; |
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267 </listitem> |
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268 |
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269 <listitem> |
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270 <c-func>setitimer</c-func> otherwise. |
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271 </listitem> |
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272 |
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273 </list> |
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274 </para> |
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275 |
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276 </directive> |
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277 |
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278 |
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279 <directive name="user"> |
271 | 280 <syntax><value>user</value> [<value>group</value>]</syntax> |
102
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281 <default>nobody nobody</default> |
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282 <context>main</context> |
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283 |
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284 <para> |
271 | 285 Defines <value>user</value> and <value>group</value> |
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286 credentials used by worker processes. |
271 | 287 If <value>group</value> is omitted, a group whose name equals |
288 that of <value>user</value> is used. | |
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289 </para> |
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290 |
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291 </directive> |
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292 |
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293 |
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294 <directive name="worker_priority"> |
271 | 295 <syntax><value>number</value></syntax> |
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296 <default>0</default> |
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297 <context>main</context> |
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298 |
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299 <para> |
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300 Defines a scheduling priority for worker processes like is |
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301 done by the <command>nice</command> command: a negative |
271 | 302 <value>number</value> |
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303 means higher priority. |
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304 Allowed range normally varies from -20 to 20. |
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305 </para> |
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306 |
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307 <para> |
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308 Example: |
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309 <example> |
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310 worker_priority -10; |
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311 </example> |
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312 </para> |
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313 |
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314 </directive> |
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315 |
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316 |
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317 <directive name="worker_processes"> |
271 | 318 <syntax><value>number</value></syntax> |
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319 <default>1</default> |
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320 <context>main</context> |
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321 |
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322 <para> |
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323 Defines the number of worker processes. |
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324 </para> |
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325 |
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326 <para> |
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327 The optimal value depends on many factors including (but not |
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328 limited to) the number of CPU cores, the number of hard disk |
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329 drives that store data, and load pattern. |
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330 When in doubt, setting it to the number of available CPU cores |
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331 would be a good start. |
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332 </para> |
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333 |
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334 </directive> |
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335 |
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336 |
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337 <directive name="worker_rlimit_core"> |
271 | 338 <syntax><value>size</value></syntax> |
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339 <default/> |
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340 <context>main</context> |
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341 |
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342 <para> |
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343 Changes the limit on the largest size of a core file |
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344 (<c-def>RLIMIT_CORE</c-def>) for worker processes. |
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345 Used to increase the limit without restarting the main process. |
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346 </para> |
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347 |
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348 </directive> |
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349 |
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350 |
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351 <directive name="worker_rlimit_nofile"> |
271 | 352 <syntax><value>number</value></syntax> |
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353 <default/> |
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354 <context>main</context> |
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355 |
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356 <para> |
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357 Changes the limit on the maximum number of open files |
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358 (<c-def>RLIMIT_NOFILE</c-def>) for worker processes. |
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359 Used to increase the limit without restarting the main process. |
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360 </para> |
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361 |
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362 </directive> |
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363 |
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364 |
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365 <directive name="working_directory"> |
271 | 366 <syntax><value>directory</value></syntax> |
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367 <default/> |
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368 <context>main</context> |
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369 |
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370 <para> |
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371 Defines a current working directory for a worker process. |
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372 It is primarily used when writing a core-file, in which case |
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373 a worker process should have write permission for the |
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374 specified directory. |
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375 </para> |
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376 |
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377 </directive> |
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378 |
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379 </section> |
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380 |
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381 </module> |