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annotate xml/ru/docs/ngx_core_module.xml @ 455:571b790ddf9e

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error_log: documented the special value "stderr" and default logging level.
author Ruslan Ermilov <ru@nginx.com>
date Tue, 20 Mar 2012 08:24:14 +0000
parents 43c84d19bf92
children 8275e169f77b
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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> | <literal>stderr</literal>
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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 Специальное значение <literal>stderr</literal> выбирает стандартный файл ошибок.
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72 </para>
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73
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74 <para>
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75 Второй параметр определяет уровень лога.
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76 Уровни лога, указанные выше, перечислены в порядке возрастания их серьёзности.
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77 При установке определённого уровня в лог попадают все сообщения
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78 указанного и более серьёзных уровней.
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79 Например, при стандартном уровне <literal>error</literal> в лог попадают
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80 сообщения уровней <literal>error</literal>, <literal>crit</literal>,
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81 <literal>alert</literal> и <literal>emerg</literal>.
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82 Если этот параметр не задан, используется <literal>error</literal>.
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83 <note>
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84 Для работы уровня лога <literal>debug</literal> необходимо сконфигурировать
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85 nginx с <literal>--with-debug</literal>.
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86 </note>
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87 </para>
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88
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89 </directive>
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90
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91
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92 <directive name="env">
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93 <syntax><value>переменная</value>[=<value>значение</value>]</syntax>
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94 <default>TZ</default>
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95 <context>main</context>
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96
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97 <para>
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98 Позволяет ограничить набор переменных окружения, поменять им значения
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99 или же создать новые переменные окружения для следующих случаев:
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100 <list type="bullet">
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101
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102 <listitem>
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103 наследование переменных во время
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104 <link doc="control.xml" id="upgrade">обновления исполняемого файла на лету</link>;
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105 </listitem>
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106
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107 <listitem>
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108 использование переменных модулем
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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 использование переменных рабочими процессами.
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114 Однако нужно иметь в виду, что управление поведением системных библиотек
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115 подобным образом возможно не всегда, поскольку зачастую библиотеки используют
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116 переменные только во время инициализации, то есть ещё до того, как их
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117 можно задать с помощью данной директивы.
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118 Исключением из этого является вышеописанное
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119 <link doc="control.xml" id="upgrade">обновление исполняемого файла на лету</link>.
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120 </listitem>
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121
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122 </list>
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123 </para>
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124
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125 <para>
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126 Если переменная TZ не описана явно, то она всегда наследуется
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127 и всегда доступна модулю
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128 <link doc="http/ngx_http_perl_module.xml">ngx_http_perl_module</link>.
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129 </para>
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130
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131 <para>
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132 Пример использования:
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133 <example>
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134 env MALLOC_OPTIONS;
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135 env PERL5LIB=/data/site/modules;
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136 env OPENSSL_ALLOW_PROXY_CERTS=1;
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137 </example>
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138 </para>
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139
444
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140 <para>
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141 <note>
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142 Переменная окружения NGINX используется для внутренних целей nginx
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143 и не должна устанавливаться непосредственно самим пользователем.
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144 </note>
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145 </para>
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146
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147 </directive>
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148
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149
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150 <directive name="include">
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151 <syntax><value>файл</value> | <value>маска</value></syntax>
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152 <default/>
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153 <context/>
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154
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155 <para>
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156 Включает в конфигурацию другой <value>файл</value> или файлы,
255
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157 подходящие под заданную маску.
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158 Включаемые файлы должны содержать синтаксически верные директивы и блоки.
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159 </para>
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160
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161 <para>
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162 Пример использования:
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163 <example>
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164 include mime.types;
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165 include vhosts/*.conf;
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166 </example>
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167 </para>
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168
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169 </directive>
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170
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171
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172 <directive name="master_process">
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173 <syntax><literal>on</literal> | <literal>off</literal></syntax>
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174 <default>on</default>
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175 <context>main</context>
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176
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177 <para>
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178 Определяет, будут ли запускаться рабочие процессы.
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179 Эта директива предназначена для разработчиков nginx.
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180 </para>
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181
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182 </directive>
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183
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184
289
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185 <directive name="pcre_jit">
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186 <syntax><literal>on</literal> | <literal>off</literal></syntax>
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187 <default>off</default>
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188 <context>main</context>
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189 <appeared-in>1.1.12</appeared-in>
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190
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191 <para>
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192 Разрешает или запрещает использование JIT-компиляции (PCRE JIT)
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193 для регулярных выражений, известных на момент парсинга конфигурации.
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194 </para>
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195
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196 <para>
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197 Использование PCRE JIT способно существенно ускорить обработку
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198 регулярных выражений.
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199 <note>
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200 Для работы JIT необходима библиотека PCRE версии 8.20 или выше,
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201 собранная с параметром конфигурации <literal>--enable-jit</literal>.
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202 При сборке библиотеки PCRE вместе с nginx (<literal>--with-pcre=</literal>),
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203 для включения поддержки JIT необходимо использовать параметр
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204 конфигурации <literal>--with-pcre-jit</literal>.
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205 </note>
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206 </para>
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207
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208 </directive>
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209
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210
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211 <directive name="pid">
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212 <syntax><value>файл</value></syntax>
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213 <default>nginx.pid</default>
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214 <context>main</context>
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215
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216 <para>
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217 Задаёт <value>файл</value>, в котором будет храниться номер (PID) основного процесса.
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218 </para>
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219
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220 </directive>
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221
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222
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223 <directive name="ssl_engine">
271
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224 <syntax><value>устройство</value></syntax>
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225 <default/>
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226 <context>main</context>
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227
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228 <para>
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229 Задаёт название аппаратного SSL-акселератора.
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230 </para>
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231
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232 </directive>
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233
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234
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235 <directive name="timer_resolution">
271
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236 <syntax><value>интервал</value></syntax>
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237 <default/>
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238 <context>main</context>
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239
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240 <para>
255
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241 Уменьшает разрешение таймеров времени в рабочих процессах, за счёт
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242 чего уменьшается число системных вызовов <c-func>gettimeofday</c-func>.
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243 По умолчанию <c-func>gettimeofday</c-func> вызывается после каждой
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244 операции получения событий из ядра.
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245 C уменьшенным разрешением <c-func>gettimeofday</c-func> вызывается только
271
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246 один раз за указанный <value>интервал</value>.
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247 </para>
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248
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249 <para>
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250 Пример использования:
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251 <example>
255
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252 timer_resolution 100ms;
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253 </example>
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254 </para>
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255
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256 <para>
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257 Внутренняя реализация интервала зависит от используемого метода:
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258 <list type="bullet">
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259
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260 <listitem>
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261 фильтр <c-def>EVFILT_TIMER</c-def> при использовании <literal>kqueue</literal>;
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262 </listitem>
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263
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264 <listitem>
271
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265 <c-func>timer_create</c-func> при использовании <literal>eventport</literal>;
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266 </listitem>
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267
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268 <listitem>
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269 и <c-func>setitimer</c-func> во всех остальных случаях.
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270 </listitem>
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271
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272 </list>
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273 </para>
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274
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275 </directive>
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276
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277
255
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278 <directive name="user">
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279 <syntax><value>пользователь</value> [<value>группа</value>]</syntax>
255
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280 <default>nobody nobody</default>
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281 <context>main</context>
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282
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283 <para>
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284 Задаёт пользователя и группу, с правами которого будут работать
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285 рабочие процессы.
271
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286 Если <value>группа</value> не задана, то используется группа, имя
255
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287 которой совпадает с именем пользователя.
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288 </para>
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289
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290 </directive>
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291
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292
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293 <directive name="worker_priority">
271
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294 <syntax><value>число</value></syntax>
255
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295 <default>0</default>
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296 <context>main</context>
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297
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298 <para>
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299 Задаёт приоритет планирования рабочих процессов подобно тому,
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300 как это делается командой <command>nice</command>: отрицательное
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301 <value>число</value>
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302 означает более высокий приоритет.
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303 Диапазон возможных значений, как правило, варьируется от -20 до 20.
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304 </para>
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305
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306 <para>
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307 Пример использования:
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308 <example>
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309 worker_priority -10;
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310 </example>
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311 </para>
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312
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313 </directive>
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314
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315
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316 <directive name="worker_processes">
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317 <syntax><value>число</value></syntax>
255
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318 <default>1</default>
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319 <context>main</context>
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320
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321 <para>
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322 Задаёт число рабочих процессов.
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323 </para>
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324
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325 <para>
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326 Оптимальное значение зависит от множества факторов, включая
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327 (но не ограничиваясь ими) число процессорных ядер, число
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328 жёстких дисков с данными и картину нагрузок.
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329 Если затрудняетесь в выборе правильного значения, можно начать
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330 с установки его равным числу процессорных ядер.
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331 </para>
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332
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333 </directive>
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334
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335
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336 <directive name="worker_rlimit_core">
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337 <syntax><value>размер</value></syntax>
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338 <default/>
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339 <context>main</context>
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340
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341 <para>
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342 Изменяет ограничение на наибольший размер core-файла
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343 (<c-def>RLIMIT_CORE</c-def>) для рабочих процессов.
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344 Используется для увеличения ограничения без перезапуска основного процесса.
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345 </para>
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346
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347 </directive>
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348
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349
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350 <directive name="worker_rlimit_nofile">
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351 <syntax><value>число</value></syntax>
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352 <default/>
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353 <context>main</context>
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354
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355 <para>
255
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356 Изменяет ограничение на максимальное число открытых файлов
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357 (<c-def>RLIMIT_NOFILE</c-def>) для рабочих процессов.
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358 Используется для увеличения ограничения без перезапуска основного процесса.
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359 </para>
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360
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361 </directive>
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362
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363
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364 <directive name="working_directory">
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365 <syntax><value>каталог</value></syntax>
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366 <default/>
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367 <context>main</context>
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368
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369 <para>
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370 Задаёт каталог, который будет текущим для рабочего процесса.
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371 Основное применение — запись core-файла, в этом случае рабочий
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372 процесс должен иметь права на запись в этот каталог.
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373 </para>
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374
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375 </directive>
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376
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377 </section>
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378
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379 </module>