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annotate xml/ru/docs/http/ngx_http_limit_conn_module.xml @ 580:be54c443235a

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Added copyright markers to documentation sources.
author Ruslan Ermilov <ru@nginx.com>
date Tue, 10 Jul 2012 12:59:42 +0000
parents ebcb351d9eb3
children 764fbac1b8b4
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 <?xml version="1.0"?>
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2
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3 <!--
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4 Copyright (C) Igor Sysoev
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5 Copyright (C) Nginx, Inc.
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6 -->
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7
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8 <!DOCTYPE module SYSTEM "../../../../dtd/module.dtd">
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9
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10 <module name="Модуль ngx_http_limit_conn_module"
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11 link="/ru/docs/http/ngx_http_limit_conn_module.html"
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12 lang="ru">
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13
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14 <section id="summary">
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15
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16 <para>
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17 Модуль <literal>ngx_http_limit_conn_module</literal> позволяет ограничить
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18 число соединений по заданному ключу или,
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19 как частный случай, число соединений с одного IP-адреса.
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20 </para>
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21
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22 <para>
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23 Ограничиваются не любые соединения, а лишь те, в которых имеются
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24 запросы, обрабатываемые сервером, и заголовок запроса уже прочитан.
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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="example" name="Пример конфигурации">
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31
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32 <para>
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33 <example>
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34 http {
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35 limit_conn_zone $binary_remote_addr zone=addr:10m;
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36
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37 ...
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38
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39 server {
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40
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41 ...
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42
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43 location /download/ {
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44 limit_conn addr 1;
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45 }
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46 </example>
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47 </para>
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48
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49 </section>
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50
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51
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52 <section id="directives" name="Директивы">
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53
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54 <directive name="limit_conn">
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55 <syntax><value>зона</value> <value>число</value></syntax>
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56 <default/>
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57 <context>http</context>
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58 <context>server</context>
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59 <context>location</context>
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60
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61 <para>
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62 Задаёт зону разделяемой памяти и максимально допустимое число соединений
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63 для одного значения ключа.
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64 При превышении этого числа в ответ на запрос сервер вернёт ошибку
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65 <http-status code="503" text="Service Temporarily Unavailable"/>.
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66 Например, директивы
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67 <example>
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68 limit_conn_zone $binary_remote_addr zone=addr:10m;
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69
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70 server {
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71 location /download/ {
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72 limit_conn addr 1;
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73 }
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74 </example>
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75 разрешают одновременно обрабатывать не более одного соединения с одного
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76 IP-адреса.
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77 </para>
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78
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79 <para>
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80 Допустимо одновременное указание нескольких директив
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81 <literal>limit_conn</literal>,
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82 при этом будет срабатывать любое из ограничений.
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83 Например, следующая конфигурация ограничивает число соединений с сервером
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84 с одного клиентского IP-адреса и в то же время ограничивает общее число
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85 соединений с виртуальным хостом:
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86 <example>
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87 limit_conn_zone $binary_remote_addr zone=perip:10m;
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88 limit_conn_zone $server_name zone=perserver:10m;
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89
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90 server {
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91 ...
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92 limit_conn perip 10;
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93 limit_conn perserver 100;
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94 }
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95 </example>
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96
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97 </para>
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98
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99 <para>
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100 Директивы наследуются с предыдущего уровня при условии, что на данном уровне
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101 не описаны свои директивы <literal>limit_conn</literal>.
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102 </para>
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103
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104 </directive>
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105
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106
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107 <directive name="limit_conn_log_level">
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108 <syntax>
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109 <literal>info</literal> |
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110 <literal>notice</literal> |
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111 <literal>warn</literal> |
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112 <literal>error</literal></syntax>
102
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113 <default>error</default>
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114 <context>http</context>
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115 <context>server</context>
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116 <context>location</context>
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117 <appeared-in>0.8.18</appeared-in>
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118
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119 <para>
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120 Задаёт желаемый уровень записи в лог случаев ограничения
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121 числа соединений.
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122 </para>
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123
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124 </directive>
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125
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126
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127 <directive name="limit_conn_zone">
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128 <syntax>
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129 <value>$переменная</value>
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130 <literal>zone</literal>=<value>название</value>:<value>размер</value></syntax>
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131 <default/>
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132 <context>http</context>
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133
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134 <para>
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135 Задаёт параметры зоны разделяемой памяти, которая хранит состояние
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136 для разных значений ключа.
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137 Состояние в частности хранит текущее число соединений.
390
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138 Ключом является любое непустое значение заданной переменной
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139 (пустые значения не учитываются).
179
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140 Пример использования:
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141 <example>
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142 limit_conn_zone $binary_remote_addr zone=addr:10m;
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143 </example>
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144 Здесь в качестве ключа используется IP-адрес клиента.
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145 Обратите внимание, что вместо переменной <var>$remote_addr</var>
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146 использована переменная <var>$binary_remote_addr</var>.
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147 Длина значения переменной <var>$remote_addr</var> может колебаться
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148 от 7 до 15 байт, при этом размер хранимого состояния составляет
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149 либо 32, либо 64 байта на 32-битных платформах, и всегда 64
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150 байта на 64-битных.
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151 Длина значения переменной <var>$binary_remote_addr</var> всегда
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152 равна 4 байтам, при этом размер состояния всегда равен 32 байтам
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153 на 32-битных платформах и 64 байтам на 64-битных.
367
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154 В зоне размером 1 мегабайт может разместиться около 32 тысяч состояний
179
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155 размером 32 байта, или 16 тысяч состояний размером 64 байта.
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156 При переполнении зоны в ответ на последующие запросы сервер будет
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157 возвращать ошибку
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158 <http-status code="503" text="Service Temporarily Unavailable"/>.
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159 </para>
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160
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161 </directive>
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162
365
b082f02cb7a3 Style fixed.
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163
179
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164 <directive name="limit_zone">
270
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165 <syntax>
271
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166 <value>название</value>
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167 <value>$переменная</value>
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168 <value>размер</value></syntax>
179
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169 <default/>
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170 <context>http</context>
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171
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172 <para>
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173 Эта директива устарела в версии 1.1.8, вместо неё следует
180
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174 использовать аналогичную директиву <link id="limit_conn_zone"/>
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175 с изменённым синтаксисом:
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176 <note>
271
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177 <literal>limit_conn_zone</literal>
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178 <value>$переменная</value>
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179 <literal>zone</literal>=<value>название</value>:<value>размер</value>;
180
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180 </note>
76
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181 </para>
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182
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183 </directive>
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184
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185 </section>
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186
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187 </module>