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annotate xml/ru/docs/http/ngx_http_limit_conn_module.xml @ 1699:6c96a644b0b3

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Corrected description of $binary_remote_addr and saved state.
author Yaroslav Zhuravlev <yar@nginx.com>
date Thu, 05 May 2016 14:43:40 +0300
parents d846df055f03
children 469aebbd94d0
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 rev="9">
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14
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15 <section id="summary">
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16
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17 <para>
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18 Модуль <literal>ngx_http_limit_conn_module</literal> позволяет ограничить
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19 число соединений по заданному ключу, в частности, число соединений с одного
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20 IP-адреса.
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21 </para>
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22
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23 <para>
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24 Учитываются не все соединения, а лишь те, в которых имеются
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25 запросы, обрабатываемые сервером, и заголовок запроса уже прочитан.
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26 </para>
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27
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28 </section>
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29
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30
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31 <section id="example" name="Пример конфигурации">
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32
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33 <para>
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34 <example>
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35 http {
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36 limit_conn_zone $binary_remote_addr zone=addr:10m;
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37
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38 ...
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39
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40 server {
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41
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42 ...
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43
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44 location /download/ {
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45 limit_conn addr 1;
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46 }
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47 </example>
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48 </para>
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49
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50 </section>
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51
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52
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53 <section id="directives" name="Директивы">
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54
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55 <directive name="limit_conn">
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56 <syntax><value>зона</value> <value>число</value></syntax>
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57 <default/>
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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 Задаёт зону разделяемой памяти и максимально допустимое число соединений
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64 для одного значения ключа.
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65 При превышении этого числа в ответ на запрос сервер вернёт ошибку
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66 <http-status code="503" text="Service Temporarily Unavailable"/>.
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67 Например, директивы
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68 <example>
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69 limit_conn_zone $binary_remote_addr zone=addr:10m;
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70
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71 server {
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72 location /download/ {
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73 limit_conn addr 1;
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74 }
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75 </example>
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76 разрешают одновременно обрабатывать не более одного соединения с одного
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77 IP-адреса.
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78 <note>
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79 В HTTP/2 и SPDY каждый параллельный запрос считается отдельным соединением.
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80 </note>
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81 </para>
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82
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83 <para>
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84 Директив <literal>limit_conn</literal> может быть несколько.
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85 Например, следующая конфигурация ограничивает число соединений с сервером
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86 с одного клиентского IP-адреса и в то же время ограничивает общее число
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87 соединений с виртуальным сервером:
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88 <example>
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89 limit_conn_zone $binary_remote_addr zone=perip:10m;
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90 limit_conn_zone $server_name zone=perserver:10m;
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91
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92 server {
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93 ...
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94 limit_conn perip 10;
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95 limit_conn perserver 100;
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96 }
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97 </example>
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98
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99 </para>
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100
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101 <para>
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102 Директивы наследуются с предыдущего уровня при условии, что на данном уровне
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103 не описаны свои директивы <literal>limit_conn</literal>.
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104 </para>
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105
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106 </directive>
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107
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108
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109 <directive name="limit_conn_log_level">
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110 <syntax>
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111 <literal>info</literal> |
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112 <literal>notice</literal> |
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113 <literal>warn</literal> |
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114 <literal>error</literal></syntax>
102
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115 <default>error</default>
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116 <context>http</context>
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117 <context>server</context>
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118 <context>location</context>
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119 <appeared-in>0.8.18</appeared-in>
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120
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121 <para>
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122 Задаёт желаемый уровень записи в лог случаев ограничения
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123 числа соединений.
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124 </para>
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125
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126 </directive>
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127
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128
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129 <directive name="limit_conn_status">
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130 <syntax><value>код</value></syntax>
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131 <default>503</default>
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132 <context>http</context>
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133 <context>server</context>
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134 <context>location</context>
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135 <appeared-in>1.3.15</appeared-in>
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136
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137 <para>
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138 Позволяет переопределить код ответа, используемый при отклонении запросов.
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139 </para>
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140
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141 </directive>
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142
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143
179
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144 <directive name="limit_conn_zone">
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145 <syntax>
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146 <value>ключ</value>
271
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147 <literal>zone</literal>=<value>название</value>:<value>размер</value></syntax>
179
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148 <default/>
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149 <context>http</context>
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150
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151 <para>
575
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152 Задаёт параметры зоны разделяемой памяти, которая хранит состояние
179
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153 для разных значений ключа.
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154 Состояние в частности содержит текущее число соединений.
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155 В качестве ключа можно использовать текст, переменные и их комбинации.
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156 Запросы с пустым значением ключа не учитываются.
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157 <note>
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158 До версии 1.7.6 в качестве ключа можно было задать ровно одну переменную.
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159 </note>
179
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160 Пример использования:
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161 <example>
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162 limit_conn_zone $binary_remote_addr zone=addr:10m;
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163 </example>
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164 Здесь в качестве ключа используется IP-адрес клиента.
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165 Обратите внимание, что вместо переменной <var>$remote_addr</var>
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166 использована переменная <var>$binary_remote_addr</var>.
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167 Длина значения переменной <var>$remote_addr</var> может колебаться
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168 от 7 до 15 байт, при этом размер хранимого состояния составляет
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169 либо 32, либо 64 байта на 32-битных платформах и всегда 64
179
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170 байта на 64-битных.
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171 Длина значения переменной <var>$binary_remote_addr</var> всегда
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172 равна 4 байтам для IPv4-адресов или 16 байтам для IPv6-адресов.
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173 При этом размер состояния всегда равен 32 или 64 байтам
179
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174 на 32-битных платформах и 64 байтам на 64-битных.
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175 В зоне размером 1 мегабайт может разместиться около 32 тысяч состояний
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176 размером 32 байта или 16 тысяч состояний размером 64 байта.
179
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177 При переполнении зоны в ответ на последующие запросы сервер будет
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178 возвращать ошибку
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179 <http-status code="503" text="Service Temporarily Unavailable"/>.
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180 </para>
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181
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182 </directive>
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183
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184
179
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185 <directive name="limit_zone">
270
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186 <syntax>
271
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187 <value>название</value>
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188 <value>$переменная</value>
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189 <value>размер</value></syntax>
179
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190 <default/>
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191 <context>http</context>
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192
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193 <para>
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194 Эта директива устарела в версии 1.1.8
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195 и была удалена в версии 1.7.6.
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196 Вместо неё следует
180
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197 использовать аналогичную директиву <link id="limit_conn_zone"/>
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198 с изменённым синтаксисом:
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199 <note>
271
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200 <literal>limit_conn_zone</literal>
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201 <value>$переменная</value>
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202 <literal>zone</literal>=<value>название</value>:<value>размер</value>;
180
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203 </note>
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204 </para>
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205
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206 </directive>
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207
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208 </section>
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209
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210 </module>