Mercurial > hg > nginx-site
annotate xml/en/docs/ngx_core_module.xml @ 567:7ff0dd5fe6f0
Updated with Netcraft July 2012 Web Server Survey stats.
author | Ruslan Ermilov <ru@nginx.com> |
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date | Tue, 03 Jul 2012 13:25:07 +0000 |
parents | 345012910707 |
children | 71d775bef043 |
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 |
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45 <directive name="debug_connection"> |
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46 <syntax> |
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47 <value>address</value> | |
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48 <value>CIDR</value> | |
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49 <literal>unix:</literal></syntax> |
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50 <default/> |
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51 <context>events</context> |
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52 |
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53 <para> |
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54 Enables debugging log for selected client connections. |
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55 Other connections will use logging level set by the |
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56 <link id="error_log"/> directive. |
523 | 57 Debugged connections are specified by IPv4 or IPv6 (1.3.0, 1.2.1) |
58 address or network. | |
516
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59 A connection may also be specified using a hostname, in which case the |
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60 first IPv4 address corresponding to a name is used. |
523 | 61 For connections using UNIX-domain sockets (1.3.0, 1.2.1), |
62 debugging log is enabled by the “<literal>unix:</literal>” parameter. | |
516
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63 <example> |
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64 events { |
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65 debug_connection 127.0.0.1; |
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66 debug_connection localhost; |
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67 debug_connection 192.0.2.0/24; |
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68 debug_connection ::1; |
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69 debug_connection 2001:0db8::/32; |
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70 debug_connection unix:; |
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71 ... |
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72 } |
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73 </example> |
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74 <note> |
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75 For this directive to work, nginx needs to |
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76 be built with <literal>--with-debug</literal>. |
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77 </note> |
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78 </para> |
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79 |
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80 </directive> |
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81 |
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82 |
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83 <directive name="error_log"> |
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84 <syntax> |
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85 <value>file</value> | <literal>stderr</literal> |
271 | 86 [<literal>debug</literal> | |
87 <literal>info</literal> | | |
88 <literal>notice</literal> | | |
89 <literal>warn</literal> | | |
90 <literal>error</literal> | | |
91 <literal>crit</literal> | | |
92 <literal>alert</literal> | | |
93 <literal>emerg</literal>]</syntax> | |
158
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94 <default>logs/error.log error</default> |
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95 <context>main</context> |
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96 <context>http</context> |
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97 <context>server</context> |
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98 <context>location</context> |
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99 |
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100 <para> |
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101 Configures logging. |
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102 </para> |
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103 |
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104 <para> |
271 | 105 The first parameter defines a file that will store the log. |
158
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106 <!-- |
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107 If filename is not absolute, it is prefixed with the prefix path. |
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108 --> |
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109 The special value <literal>stderr</literal> selects the standard error file. |
158
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110 </para> |
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111 |
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112 <para> |
271 | 113 The second parameter determines the level of logging. |
158
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114 Log levels above are listed in the order of increasing severity. |
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115 Setting a certain log level will cause all messages of |
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116 the specified and more severe log levels to be logged. |
271 | 117 For example, the default level <literal>error</literal> will |
118 cause <literal>error</literal>, <literal>crit</literal>, | |
119 <literal>alert</literal>, and <literal>emerg</literal> messages | |
158
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120 to be logged. |
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121 If this parameter is omitted then <literal>error</literal> is used. |
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122 <note> |
271 | 123 For <literal>debug</literal> logging to work, nginx needs to |
124 be built with <literal>--with-debug</literal>. | |
158
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125 </note> |
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126 </para> |
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127 |
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128 </directive> |
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129 |
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130 |
63
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131 <directive name="env"> |
271 | 132 <syntax><value>variable</value>[=<value>value</value>]</syntax> |
102
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133 <default>TZ</default> |
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134 <context>main</context> |
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135 |
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136 <para> |
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137 Allows to limit a set of environment variables, change their values, |
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138 or create new environment variables, for the following cases: |
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139 <list type="bullet"> |
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140 |
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141 <listitem> |
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142 variable inheritance during a |
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143 <link doc="control.xml" id="upgrade">live upgrade</link> |
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144 of an executable file; |
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145 </listitem> |
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146 |
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147 <listitem> |
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148 use of variables by the module |
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149 <link doc="http/ngx_http_perl_module.xml">ngx_http_perl_module</link>; |
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150 </listitem> |
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151 |
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152 <listitem> |
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153 use of variables by worker processes. |
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154 Please bear in mind that controlling system libraries in this way |
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155 is not always possible as it is not uncommon for libraries to check |
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156 variables only during initialization, well before they can be set |
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157 using this directive. |
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158 An exception from this is an above mentioned |
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159 <link doc="control.xml" id="upgrade">live upgrade</link> |
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160 of an executable file. |
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161 </listitem> |
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162 |
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163 </list> |
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164 </para> |
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165 |
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166 <para> |
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167 The TZ variable is always inherited and made available to the module |
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168 <link doc="http/ngx_http_perl_module.xml">ngx_http_perl_module</link>, |
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169 unless configured explicitly. |
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170 </para> |
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171 |
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172 <para> |
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173 Usage example: |
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174 <example> |
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175 env MALLOC_OPTIONS; |
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176 env PERL5LIB=/data/site/modules; |
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177 env OPENSSL_ALLOW_PROXY_CERTS=1; |
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178 </example> |
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179 </para> |
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180 |
444
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181 <para> |
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182 <note> |
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183 The NGINX environment variable is used internally by nginx |
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184 and should not be set directly by the user. |
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185 </note> |
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186 </para> |
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187 |
63
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188 </directive> |
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189 |
249 | 190 |
556
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191 <directive name="events"> |
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192 <syntax block="yes"/> |
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193 <default/> |
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194 <context>main</context> |
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195 |
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196 <para> |
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197 Provides a configuration file context in which the directives that |
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198 affect connection processing are specified. |
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199 </para> |
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200 |
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201 </directive> |
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202 |
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203 |
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204 <directive name="include"> |
271 | 205 <syntax><value>file</value> | <value>mask</value></syntax> |
63
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206 <default/> |
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207 <context/> |
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208 |
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209 <para> |
271 | 210 Includes another <value>file</value>, or files matching the |
211 specified <value>mask</value>, into configuration. | |
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212 Included files should consist of |
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213 syntactically correct directives and blocks. |
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214 </para> |
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215 |
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216 <para> |
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217 Usage example: |
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218 <example> |
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219 include mime.types; |
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220 include vhosts/*.conf; |
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221 </example> |
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222 </para> |
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223 |
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224 </directive> |
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225 |
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226 |
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227 <directive name="master_process"> |
271 | 228 <syntax><literal>on</literal> | <literal>off</literal></syntax> |
102
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229 <default>on</default> |
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230 <context>main</context> |
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231 |
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232 <para> |
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233 Determines whether worker processes are started. |
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234 This directive is intended for nginx developers. |
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235 </para> |
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236 |
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237 </directive> |
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238 |
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239 |
289
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240 <directive name="pcre_jit"> |
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241 <syntax><literal>on</literal> | <literal>off</literal></syntax> |
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242 <default>off</default> |
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243 <context>main</context> |
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244 <appeared-in>1.1.12</appeared-in> |
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245 |
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246 <para> |
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247 Enables or disables the use of “just-in-time compilation” (PCRE JIT) |
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248 for regular expressions known at configuration parse time. |
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249 </para> |
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250 |
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251 <para> |
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252 PCRE JIT can speed up processing of regular expressions significantly. |
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253 <note> |
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254 The JIT is available in PCRE libraries starting from version 8.20 |
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255 built with the <literal>--enable-jit</literal> configuration parameter. |
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256 When building the PCRE library with nginx (<literal>--with-pcre=</literal>), |
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257 the JIT support should be enabled with the |
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258 <literal>--with-pcre-jit</literal> configuration parameter. |
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259 </note> |
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260 </para> |
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261 |
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262 </directive> |
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263 |
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264 |
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265 <directive name="pid"> |
271 | 266 <syntax><value>file</value></syntax> |
102
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267 <default>nginx.pid</default> |
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268 <context>main</context> |
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269 |
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270 <para> |
271 | 271 Defines a <value>file</value> that will store the process ID of the main process. |
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272 </para> |
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273 |
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274 </directive> |
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275 |
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276 |
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277 <directive name="ssl_engine"> |
271 | 278 <syntax><value>device</value></syntax> |
63
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279 <default/> |
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280 <context>main</context> |
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281 |
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282 <para> |
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283 Defines the name of the hardware SSL accelerator. |
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284 </para> |
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285 |
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286 </directive> |
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287 |
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288 |
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289 <directive name="timer_resolution"> |
271 | 290 <syntax><value>interval</value></syntax> |
63
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291 <default/> |
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292 <context>main</context> |
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293 |
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294 <para> |
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295 Reduces timer resolution in worker processes, thus reducing the |
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296 number of <c-func>gettimeofday</c-func> system calls made. |
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297 By default, <c-func>gettimeofday</c-func> is called each time |
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298 on receiving a kernel event. |
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299 With reduced resolution, <c-func>gettimeofday</c-func> is only |
271 | 300 called once per specified <value>interval</value>. |
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301 </para> |
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302 |
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303 <para> |
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304 Example: |
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305 <example> |
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306 timer_resolution 100ms; |
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307 </example> |
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308 </para> |
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309 |
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310 <para> |
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311 An internal implementation of interval depends on the method used: |
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312 <list type="bullet"> |
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313 |
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314 <listitem> |
271 | 315 an <c-def>EVFILT_TIMER</c-def> filter if <literal>kqueue</literal> is used; |
63
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316 </listitem> |
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317 |
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318 <listitem> |
271 | 319 <c-func>timer_create</c-func> if <literal>eventport</literal> is used; |
63
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320 </listitem> |
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321 |
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322 <listitem> |
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323 <c-func>setitimer</c-func> otherwise. |
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324 </listitem> |
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325 |
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326 </list> |
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327 </para> |
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328 |
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329 </directive> |
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330 |
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331 |
556
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332 <directive name="use"> |
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333 <syntax><value>method</value></syntax> |
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334 <default/> |
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335 <context>events</context> |
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336 |
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337 <para> |
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338 Specifies the <link doc="events.xml">connection processing</link> |
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339 <value>method</value> to use. |
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340 There is normally no need to specify it explicitly because nginx will |
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341 by default use the most efficient method. |
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342 </para> |
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343 |
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344 </directive> |
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345 |
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346 |
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347 <directive name="user"> |
271 | 348 <syntax><value>user</value> [<value>group</value>]</syntax> |
102
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349 <default>nobody nobody</default> |
63
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350 <context>main</context> |
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351 |
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352 <para> |
271 | 353 Defines <value>user</value> and <value>group</value> |
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354 credentials used by worker processes. |
271 | 355 If <value>group</value> is omitted, a group whose name equals |
356 that of <value>user</value> is used. | |
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357 </para> |
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358 |
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359 </directive> |
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360 |
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361 |
545
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362 <directive name="worker_connections"> |
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363 <syntax><value>number</value></syntax> |
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364 <default>512</default> |
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365 <context>events</context> |
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366 |
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367 <para> |
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368 Sets the maximum number of simultaneous connections that |
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369 can be opened by a worker process. |
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370 </para> |
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371 |
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372 <para> |
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373 It should be kept in mind that this number includes all connections |
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374 (e.g. connections with proxied servers, among other things), |
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375 not only connections with clients. |
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376 Another consideration is that the actual number of simultaneous |
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377 connections may not exceed the current limit on |
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378 the maximum number of open files, see |
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379 <link id="worker_rlimit_nofile"/>. |
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380 </para> |
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381 |
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382 </directive> |
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383 |
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384 |
469
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385 <directive name="worker_cpu_affinity"> |
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386 <syntax><value>cpumask</value> ...</syntax> |
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387 <default/> |
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388 <context>main</context> |
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389 |
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390 <para> |
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391 Binds worker processes to the sets of CPUs. |
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392 Each CPU set is represented by a bitmask of allowed to use CPUs. |
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393 There should be a separate set defined for each of the worker processes. |
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394 By default, worker processes are not bound to any specific CPUs. |
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395 </para> |
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396 |
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397 <para> |
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398 For example, |
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399 <example> |
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400 worker_processes 4; |
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401 worker_cpu_affinity 0001 0010 0100 1000; |
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402 </example> |
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403 binds each worker process to a separate CPU, while |
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404 <example> |
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405 worker_processes 2; |
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406 worker_cpu_affinity 0101 1010; |
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407 </example> |
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408 binds the first worker process to CPU0/CPU2, |
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409 and the second worker process to CPU1/CPU3. |
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410 The second example is suitable for hyper-threading. |
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411 </para> |
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412 |
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413 <para> |
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414 <note> |
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415 The directive is only available on FreeBSD and Linux. |
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416 </note> |
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417 </para> |
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418 |
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419 </directive> |
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420 |
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421 |
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422 <directive name="worker_priority"> |
271 | 423 <syntax><value>number</value></syntax> |
102
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424 <default>0</default> |
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425 <context>main</context> |
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426 |
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427 <para> |
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428 Defines a scheduling priority for worker processes like is |
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429 done by the <command>nice</command> command: a negative |
271 | 430 <value>number</value> |
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431 means higher priority. |
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432 Allowed range normally varies from -20 to 20. |
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433 </para> |
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434 |
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435 <para> |
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436 Example: |
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437 <example> |
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438 worker_priority -10; |
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439 </example> |
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440 </para> |
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441 |
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442 </directive> |
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443 |
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444 |
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445 <directive name="worker_processes"> |
271 | 446 <syntax><value>number</value></syntax> |
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447 <default>1</default> |
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448 <context>main</context> |
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449 |
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450 <para> |
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451 Defines the number of worker processes. |
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452 </para> |
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453 |
226
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454 <para> |
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455 The optimal value depends on many factors including (but not |
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456 limited to) the number of CPU cores, the number of hard disk |
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457 drives that store data, and load pattern. |
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458 When in doubt, setting it to the number of available CPU cores |
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459 would be a good start. |
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460 </para> |
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461 |
63
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462 </directive> |
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463 |
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464 |
82
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465 <directive name="worker_rlimit_core"> |
271 | 466 <syntax><value>size</value></syntax> |
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467 <default/> |
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468 <context>main</context> |
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469 |
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470 <para> |
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471 Changes the limit on the largest size of a core file |
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472 (<c-def>RLIMIT_CORE</c-def>) for worker processes. |
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473 Used to increase the limit without restarting the main process. |
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474 </para> |
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475 |
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476 </directive> |
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477 |
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478 |
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479 <directive name="worker_rlimit_nofile"> |
271 | 480 <syntax><value>number</value></syntax> |
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481 <default/> |
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482 <context>main</context> |
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483 |
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484 <para> |
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485 Changes the limit on the maximum number of open files |
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486 (<c-def>RLIMIT_NOFILE</c-def>) for worker processes. |
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487 Used to increase the limit without restarting the main process. |
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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 |
554
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Documented the "worker_rlimit_sigpending" directive.
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493 <directive name="worker_rlimit_sigpending"> |
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Documented the "worker_rlimit_sigpending" directive.
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494 <syntax><value>number</value></syntax> |
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495 <default/> |
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496 <context>main</context> |
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|
497 |
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|
498 <para> |
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499 On systems that support <link doc="events.xml" id="rtsig"/> |
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500 connection processing method, |
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501 changes the limit on the number of signals that may be queued |
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502 (<c-def>RLIMIT_SIGPENDING</c-def>) for worker processes. |
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503 Used to increase the limit without restarting the main process. |
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504 </para> |
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changeset
|
505 |
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Documented the "worker_rlimit_sigpending" directive.
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|
506 </directive> |
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Documented the "worker_rlimit_sigpending" directive.
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changeset
|
507 |
ccb7451af1d8
Documented the "worker_rlimit_sigpending" directive.
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|
508 |
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509 <directive name="working_directory"> |
271 | 510 <syntax><value>directory</value></syntax> |
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511 <default/> |
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|
512 <context>main</context> |
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|
513 |
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514 <para> |
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|
515 Defines a current working directory for a worker process. |
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516 It is primarily used when writing a core-file, in which case |
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517 a worker process should have write permission for the |
63
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|
518 specified directory. |
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|
519 </para> |
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|
520 |
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|
521 </directive> |
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|
522 |
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|
523 </section> |
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|
524 |
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525 </module> |