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annotate xml/ru/docs/http/ngx_http_limit_conn_module.xml @ 222:bfe3eff81d04

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Removed redundant encoding specification.
author Ruslan Ermilov <ru@nginx.com>
date Mon, 05 Dec 2011 07:50:10 +0000
parents 2df68271c898
children 8fead61b7b03
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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222
bfe3eff81d04 Removed redundant encoding specification.
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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="Модуль ngx_http_limit_conn_module"
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6 link="/ru/docs/http/ngx_http_limit_conn_module.html"
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7 lang="ru">
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8
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9 <section id="summary">
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10
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11 <para>
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12 Модуль <code>ngx_http_limit_conn_module</code> позволяет ограничить
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13 число соединений по заданному ключу или,
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14 как частный случай, число соединений с одного IP-адреса.
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15 </para>
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16
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17 <para>
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18 Ограничиваются не любые соединения, а лишь те, в которых имеются
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19 запросы, обрабатываемые сервером, и заголовок запроса уже прочитан.
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20 </para>
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21
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22 </section>
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23
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24
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25 <section name="Пример конфигурации" id="example">
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26
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27 <para>
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28 <example>
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29 http {
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30 limit_conn_zone $binary_remote_addr zone=addr:10m;
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31
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32 ...
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33
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34 server {
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35
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36 ...
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37
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38 location /download/ {
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39 limit_conn addr 1;
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40 }
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41 </example>
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42 </para>
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43
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44 </section>
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45
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46
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47 <section name="Директивы" id="directives">
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48
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49 <directive name="limit_conn">
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50 <syntax><argument>зона число</argument></syntax>
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51 <default/>
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52 <context>http</context>
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53 <context>server</context>
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54 <context>location</context>
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55
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56 <para>
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57 Директива задаёт максимально допустимое число соединений
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58 для одного значения ключа.
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59 При превышении этого числа в ответ на запрос сервер вернёт ошибку
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60 <http-status code="503" text="Service Temporarily Unavailable"/>.
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61 Например, директивы
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62 <example>
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63 limit_conn_zone $binary_remote_addr zone=addr:10m;
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64
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65 server {
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66 location /download/ {
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67 limit_conn addr 1;
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68 }
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69 </example>
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70 разрешают одновременно обрабатывать не более одного соединения с одного
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71 IP-адреса.
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72 </para>
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73
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74 <para>
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75 Допустимо одновременное указание нескольких директив <code>limit_conn</code>,
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76 при этом будет срабатывать любое из ограничений.
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77 Например, следующая конфигурация ограничивает число соединений с сервером
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78 с одного клиентского IP-адреса и в то же время ограничивает общее число
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79 соединений с виртуальным хостом:
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80 <example>
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81 limit_conn_zone $binary_remote_addr zone=perip:10m;
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82 limit_conn_zone $server_name zone=perserver:10m;
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83
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84 server {
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85 ...
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86 limit_conn perip 10;
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87 limit_conn perserver 100;
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88 }
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89 </example>
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90
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91 </para>
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92
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93 <para>
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94 Директивы наследуются с предыдущего уровня при условии, что на данном уровне
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95 не описаны свои директивы <code>limit_conn</code>.
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96 </para>
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97
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98 </directive>
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99
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100
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101 <directive name="limit_conn_log_level">
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102 <syntax>
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103 <value>info</value> |
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104 <value>notice</value> |
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105 <value>warn</value> |
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106 <value>error</value>
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107 </syntax>
102
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108 <default>error</default>
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109 <context>http</context>
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110 <context>server</context>
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111 <context>location</context>
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112 <appeared-in>0.8.18</appeared-in>
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113
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114 <para>
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115 Директива задаёт желаемый уровень записи в лог случаев ограничения
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116 числа соединений.
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117 </para>
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118
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119 </directive>
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120
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121
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122 <directive name="limit_conn_zone">
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123 <syntax>
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124 <argument>$переменная </argument>
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125 <parameter>zone</parameter>=<argument>название</argument>:<argument>размер</argument>
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126 </syntax>
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127 <default/>
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128 <context>http</context>
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129
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130 <para>
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131 Директива задаёт параметры зоны, которая хранит состояние
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132 для разных значений ключа.
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133 Состояние в частности хранит текущее число соединений.
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134 Ключом является значение заданной переменной.
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135 Пример использования:
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136 <example>
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137 limit_conn_zone $binary_remote_addr zone=addr:10m;
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138 </example>
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139 Здесь в качестве ключа используется IP-адрес клиента.
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140 Обратите внимание, что вместо переменной <var>$remote_addr</var>
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141 использована переменная <var>$binary_remote_addr</var>.
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142 Длина значения переменной <var>$remote_addr</var> может колебаться
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143 от 7 до 15 байт, при этом размер хранимого состояния составляет
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144 либо 32, либо 64 байта на 32-битных платформах, и всегда 64
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145 байта на 64-битных.
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146 Длина значения переменной <var>$binary_remote_addr</var> всегда
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147 равна 4 байтам, при этом размер состояния всегда равен 32 байтам
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148 на 32-битных платформах и 64 байтам на 64-битных.
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149 В зоне размером 1 мегабайт может разместиться около 32 тысяч состояний
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150 размером 32 байта, или 16 тысяч состояний размером 64 байта.
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151 При переполнении зоны в ответ на последующие запросы сервер будет
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152 возвращать ошибку
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153 <http-status code="503" text="Service Temporarily Unavailable"/>.
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154 </para>
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155
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156 </directive>
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157
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158 <directive name="limit_zone">
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159 <syntax><argument>$переменная название размер</argument></syntax>
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160 <default/>
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161 <context>http</context>
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162
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163 <para>
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164 Эта директива устарела в версии 1.1.8, вместо неё следует
180
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165 использовать аналогичную директиву <link id="limit_conn_zone"/>
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166 с изменённым синтаксисом:
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167 <note>
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168 <code>limit_conn_zone </code>
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169 <argument>$переменная </argument>
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170 <parameter>zone</parameter>=<argument>название</argument>:<argument>размер</argument>;
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171 </note>
76
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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 </section>
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177
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178 </module>