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annotate xml/ru/docs/ngx_core_module.xml @ 289:df261b1ce71f

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Documented the --with-pcre-jit configuration parameter and the "pcre_jit" directive.
author Ruslan Ermilov <ru@nginx.com>
date Wed, 28 Dec 2011 12:51:26 +0000
parents 4c6d2c614d2c
children 43c84d19bf92
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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="Основная функциональность"
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6 link="/ru/docs/ngx_core_module.html"
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7 lang="ru">
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8
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9 <section id="example" name="Пример конфигурации">
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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="Директивы">
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31
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32 <directive name="daemon">
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33 <syntax><literal>on</literal> | <literal>off</literal></syntax>
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34 <default>on</default>
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35 <context>main</context>
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36
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37 <para>
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38 Определяет, будет ли nginx запускаться в режиме демона.
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39 Используется в основном для разработки.
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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="error_log">
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46 <syntax>
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47 <value>файл</value>
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48 [<literal>debug</literal> |
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49 <literal>info</literal> |
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50 <literal>notice</literal> |
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51 <literal>warn</literal> |
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52 <literal>error</literal> |
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53 <literal>crit</literal> |
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54 <literal>alert</literal> |
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55 <literal>emerg</literal>]</syntax>
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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 Конфигурирует запись в лог.
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64 </para>
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65
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66 <para>
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67 Первый параметр задаёт файл, который будет хранить лог.
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68 <!--
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69 Если имя файла не абсолютное, к нему добавляется в начало путь префикса.
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70 -->
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71 </para>
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72
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73 <para>
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74 Второй параметр определяет уровень лога.
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75 Уровни лога, указанные выше, перечислены в порядке возрастания их серьёзности.
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76 При установке определённого уровня в лог попадают все сообщения
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77 указанного и более серьёзных уровней.
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78 Например, при стандартном уровне <literal>error</literal> в лог попадают
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79 сообщения уровней <literal>error</literal>, <literal>crit</literal>,
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80 <literal>alert</literal> и <literal>emerg</literal>.
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81
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82 <note>
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83 Для работы уровня лога <literal>debug</literal> необходимо сконфигурировать
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84 nginx с <literal>--with-debug</literal>.
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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
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91 <directive name="env">
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92 <syntax><value>переменная</value>[=<value>значение</value>]</syntax>
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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 Позволяет ограничить набор переменных окружения, поменять им значения
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98 или же создать новые переменные окружения для следующих случаев:
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99 <list type="bullet">
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100
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101 <listitem>
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102 наследование переменных во время
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103 <link doc="control.xml" id="upgrade">обновления исполняемого файла на лету</link>;
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104 </listitem>
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105
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106 <listitem>
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107 использование переменных модулем
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108 <link doc="http/ngx_http_perl_module.xml">ngx_http_perl_module</link>;
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109 </listitem>
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110
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111 <listitem>
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112 использование переменных рабочими процессами.
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113 Однако нужно иметь в виду, что управление поведением системных библиотек
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114 подобным образом возможно не всегда, поскольку зачастую библиотеки используют
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115 переменные только во время инициализации, то есть ещё до того, как их
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116 можно задать с помощью данной директивы.
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117 Исключением из этого является вышеописанное
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118 <link doc="control.xml" id="upgrade">обновление исполняемого файла на лету</link>.
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119 </listitem>
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120
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121 </list>
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122 </para>
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123
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124 <para>
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125 Если переменная TZ не описана явно, то она всегда наследуется
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126 и всегда доступна модулю
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127 <link doc="http/ngx_http_perl_module.xml">ngx_http_perl_module</link>.
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128 </para>
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129
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130 <para>
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131 Пример использования:
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132 <example>
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133 env MALLOC_OPTIONS;
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134 env PERL5LIB=/data/site/modules;
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135 env OPENSSL_ALLOW_PROXY_CERTS=1;
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136 </example>
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137 </para>
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138
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139 </directive>
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140
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141
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142 <directive name="include">
271
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143 <syntax><value>файл</value> | <value>маска</value></syntax>
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144 <default/>
104
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145 <context/>
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146
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147 <para>
271
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148 Включает в конфигурацию другой <value>файл</value> или файлы,
255
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149 подходящие под заданную маску.
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150 Включаемые файлы должны содержать синтаксически верные директивы и блоки.
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151 </para>
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152
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153 <para>
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154 Пример использования:
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155 <example>
255
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156 include mime.types;
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157 include vhosts/*.conf;
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158 </example>
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159 </para>
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160
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161 </directive>
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162
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163
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164 <directive name="master_process">
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165 <syntax><literal>on</literal> | <literal>off</literal></syntax>
102
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166 <default>on</default>
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167 <context>main</context>
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168
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169 <para>
255
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170 Определяет, будут ли запускаться рабочие процессы.
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171 Эта директива предназначена для разработчиков nginx.
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172 </para>
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173
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174 </directive>
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175
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176
289
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177 <directive name="pcre_jit">
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178 <syntax><literal>on</literal> | <literal>off</literal></syntax>
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179 <default>off</default>
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180 <context>main</context>
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181 <appeared-in>1.1.12</appeared-in>
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182
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183 <para>
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184 Разрешает или запрещает использование JIT-компиляции (PCRE JIT)
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185 для регулярных выражений, известных на момент парсинга конфигурации.
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186 </para>
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187
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188 <para>
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189 Использование PCRE JIT способно существенно ускорить обработку
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190 регулярных выражений.
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191 <note>
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192 Для работы JIT необходима библиотека PCRE версии 8.20 или выше,
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193 собранная с параметром конфигурации <literal>--enable-jit</literal>.
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194 При сборке библиотеки PCRE вместе с nginx (<literal>--with-pcre=</literal>),
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195 для включения поддержки JIT необходимо использовать параметр
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196 конфигурации <literal>--with-pcre-jit</literal>.
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197 </note>
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198 </para>
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199
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200 </directive>
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201
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202
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203 <directive name="pid">
271
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204 <syntax><value>файл</value></syntax>
102
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205 <default>nginx.pid</default>
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206 <context>main</context>
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207
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208 <para>
271
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209 Задаёт <value>файл</value>, в котором будет храниться номер (PID) основного процесса.
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210 </para>
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211
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212 </directive>
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213
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214
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215 <directive name="ssl_engine">
271
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216 <syntax><value>устройство</value></syntax>
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217 <default/>
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218 <context>main</context>
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219
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220 <para>
255
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221 Задаёт название аппаратного SSL-акселератора.
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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="timer_resolution">
271
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228 <syntax><value>интервал</value></syntax>
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229 <default/>
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230 <context>main</context>
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231
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232 <para>
255
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233 Уменьшает разрешение таймеров времени в рабочих процессах, за счёт
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234 чего уменьшается число системных вызовов <c-func>gettimeofday</c-func>.
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235 По умолчанию <c-func>gettimeofday</c-func> вызывается после каждой
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236 операции получения событий из ядра.
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237 C уменьшенным разрешением <c-func>gettimeofday</c-func> вызывается только
271
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238 один раз за указанный <value>интервал</value>.
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239 </para>
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240
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241 <para>
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242 Пример использования:
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243 <example>
255
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244 timer_resolution 100ms;
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245 </example>
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246 </para>
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247
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248 <para>
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249 Внутренняя реализация интервала зависит от используемого метода:
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250 <list type="bullet">
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251
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252 <listitem>
271
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253 фильтр <c-def>EVFILT_TIMER</c-def> при использовании <literal>kqueue</literal>;
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254 </listitem>
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255
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256 <listitem>
271
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257 <c-func>timer_create</c-func> при использовании <literal>eventport</literal>;
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258 </listitem>
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259
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260 <listitem>
255
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261 и <c-func>setitimer</c-func> во всех остальных случаях.
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262 </listitem>
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263
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264 </list>
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265 </para>
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266
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267 </directive>
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268
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269
255
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270 <directive name="user">
271
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271 <syntax><value>пользователь</value> [<value>группа</value>]</syntax>
255
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272 <default>nobody nobody</default>
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273 <context>main</context>
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274
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275 <para>
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276 Задаёт пользователя и группу, с правами которого будут работать
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277 рабочие процессы.
271
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278 Если <value>группа</value> не задана, то используется группа, имя
255
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279 которой совпадает с именем пользователя.
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280 </para>
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281
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282 </directive>
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283
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284
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285 <directive name="worker_priority">
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286 <syntax><value>число</value></syntax>
255
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287 <default>0</default>
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288 <context>main</context>
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289
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290 <para>
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291 Задаёт приоритет планирования рабочих процессов подобно тому,
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292 как это делается командой <command>nice</command>: отрицательное
271
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293 <value>число</value>
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294 означает более высокий приоритет.
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295 Диапазон возможных значений, как правило, варьируется от -20 до 20.
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296 </para>
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297
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298 <para>
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299 Пример использования:
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300 <example>
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301 worker_priority -10;
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302 </example>
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303 </para>
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304
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305 </directive>
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306
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307
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308 <directive name="worker_processes">
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309 <syntax><value>число</value></syntax>
255
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310 <default>1</default>
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311 <context>main</context>
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312
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313 <para>
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314 Задаёт число рабочих процессов.
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315 </para>
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316
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317 <para>
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318 Оптимальное значение зависит от множества факторов, включая
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319 (но не ограничиваясь ими) число процессорных ядер, число
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320 жёстких дисков с данными и картину нагрузок.
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321 Если затрудняетесь в выборе правильного значения, можно начать
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322 с установки его равным числу процессорных ядер.
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323 </para>
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324
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325 </directive>
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326
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327
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328 <directive name="worker_rlimit_core">
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329 <syntax><value>размер</value></syntax>
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330 <default/>
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331 <context>main</context>
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332
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333 <para>
255
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334 Изменяет ограничение на наибольший размер core-файла
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335 (<c-def>RLIMIT_CORE</c-def>) для рабочих процессов.
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336 Используется для увеличения ограничения без перезапуска основного процесса.
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337 </para>
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338
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339 </directive>
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340
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341
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342 <directive name="worker_rlimit_nofile">
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343 <syntax><value>число</value></syntax>
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344 <default/>
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345 <context>main</context>
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346
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347 <para>
255
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348 Изменяет ограничение на максимальное число открытых файлов
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349 (<c-def>RLIMIT_NOFILE</c-def>) для рабочих процессов.
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350 Используется для увеличения ограничения без перезапуска основного процесса.
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351 </para>
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352
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353 </directive>
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354
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355
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356 <directive name="working_directory">
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357 <syntax><value>каталог</value></syntax>
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358 <default/>
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359 <context>main</context>
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360
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361 <para>
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362 Задаёт каталог, который будет текущим для рабочего процесса.
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363 Основное применение — запись core-файла, в этом случае рабочий
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364 процесс должен иметь права на запись в этот каталог.
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365 </para>
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366
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367 </directive>
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368
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369 </section>
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370
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371 </module>