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annotate xml/ru/docs/stream/ngx_stream_limit_conn_module.xml @ 2593:eeed494bba51

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Unified phrases about configuration levels and inheritance.
author Ruslan Ermilov <ru@nginx.com>
date Mon, 21 Sep 2020 15:45:07 +0300
parents e4332b7580bb
children 9eadb98ec770
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_stream_limit_conn_module"
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11 link="/ru/docs/stream/ngx_stream_limit_conn_module.html"
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12 lang="ru"
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13 rev="7">
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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_stream_limit_conn_module</literal> (1.9.3) позволяет
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19 ограничить
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20 число соединений по заданному ключу, в частности, число соединений с одного
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21 IP-адреса.
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22 </para>
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23
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24 </section>
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25
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26
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27 <section id="example" name="Пример конфигурации">
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28
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29 <para>
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30 <example>
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31 stream {
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32 limit_conn_zone $binary_remote_addr zone=addr:10m;
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33
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34 ...
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35
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36 server {
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37
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38 ...
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39
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40 limit_conn addr 1;
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41 limit_conn_log_level error;
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42 }
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43 }
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44 </example>
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45 </para>
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46
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47 </section>
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48
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49
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50 <section id="directives" name="Директивы">
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51
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52 <directive name="limit_conn">
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53 <syntax><value>зона</value> <value>число</value></syntax>
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54 <default/>
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55 <context>stream</context>
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56 <context>server</context>
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57
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58 <para>
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59 Задаёт зону разделяемой памяти и максимально допустимое число соединений
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60 для одного значения ключа.
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61 При превышении этого числа сервер закроет соединение.
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62 Например, директивы
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63 <example>
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64 limit_conn_zone $binary_remote_addr zone=addr:10m;
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65
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66 server {
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67 ...
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68 limit_conn addr 1;
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69 }
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70 </example>
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71 разрешают одновременно обрабатывать не более одного соединения с одного
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72 IP-адреса.
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73 </para>
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74
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75 <para>
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76 Допустимо одновременное указание нескольких директив
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77 <literal>limit_conn</literal>,
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78 при этом будет срабатывать любое из ограничений.
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79 </para>
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81 <para>
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82 Директивы наследуются с предыдущего уровня конфигурации при условии, что
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83 на данном уровне не описаны свои директивы <literal>limit_conn</literal>.
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84 </para>
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85
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86 </directive>
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88
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89 <directive name="limit_conn_dry_run">
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90 <syntax><literal>on</literal> | <literal>off</literal></syntax>
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91 <default>off</default>
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92 <context>stream</context>
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93 <context>server</context>
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94 <appeared-in>1.17.6</appeared-in>
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95
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96 <para>
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97 Включает режим пробного запуска.
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98 В данном режиме число соединений не ограничивается, однако
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99 в зоне разделяемой памяти текущее число избыточных соединений учитывается
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100 как обычно.
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101 </para>
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102
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103 </directive>
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104
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105
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106 <directive name="limit_conn_log_level">
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107 <syntax>
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108 <literal>info</literal> |
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109 <literal>notice</literal> |
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110 <literal>warn</literal> |
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111 <literal>error</literal></syntax>
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112 <default>error</default>
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113 <context>stream</context>
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114 <context>server</context>
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115
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116 <para>
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117 Задаёт желаемый уровень записи в лог случаев ограничения
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118 числа соединений.
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119 </para>
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120
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121 </directive>
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122
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123
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124 <directive name="limit_conn_zone">
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125 <syntax>
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126 <value>ключ</value>
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127 <literal>zone</literal>=<value>название</value>:<value>размер</value></syntax>
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128 <default/>
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129 <context>stream</context>
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130
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131 <para>
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132 Задаёт параметры зоны разделяемой памяти, которая хранит состояние
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133 для разных значений ключа.
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134 Состояние в частности содержит текущее число соединений.
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135 В качестве <value>ключа</value> может использоваться текст, переменные
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136 и их комбинации (1.11.2).
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137 Запросы с пустым значением ключа не учитываются.
179
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138 Пример использования:
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139 <example>
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140 limit_conn_zone $binary_remote_addr zone=addr:10m;
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141 </example>
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142 Здесь в качестве ключа используется IP-адрес клиента,
1744
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143 задаваемый переменной <literal>$binary_remote_addr</literal>.
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144 Длина значения <literal>$binary_remote_addr</literal>
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145 равна 4 байтам для IPv4-адресов или 16 байтам для IPv6-адресов.
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146 При этом размер состояния всегда равен 32 или 64 байтам
179
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147 на 32-битных платформах и 64 байтам на 64-битных.
367
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148 В зоне размером 1 мегабайт может разместиться около 32 тысяч состояний
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149 размером 32 байта или 16 тысяч состояний размером 64 байта.
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150 При переполнении зоны сервер закроет соединение.
179
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151 </para>
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152
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153 </directive>
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154
2495
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155 <para>
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156 <note>
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157 Дополнительно, как часть
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158 <commercial_version>коммерческой подписки</commercial_version>,
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159 <link doc="../http/ngx_http_api_module.xml" id="stream_limit_conns_">информацию о состоянии</link>
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160 каждой такой зоны разделяемой памяти можно
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161 <link doc="../http/ngx_http_api_module.xml" id="getStreamLimitConnZone">получить</link> или
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162 <link doc="../http/ngx_http_api_module.xml" id="deleteStreamLimitConnZoneStat">сбросить</link>
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163 при помощи <link doc="../http/ngx_http_api_module.xml">API</link>
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164 начиная с версии 1.17.7.
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165 </note>
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166 </para>
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167
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168 </section>
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169
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170
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171 <section id="variables" name="Встроенные переменные">
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172
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173 <para>
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174 <list type="tag">
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175
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176 <tag-name id="var_limit_conn_status"><var>$limit_conn_status</var></tag-name>
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177 <tag-desc>
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178 хранит результат ограничения числа соединений (1.17.6):
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179 <literal>PASSED</literal>,
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180 <literal>REJECTED</literal> или
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181 <literal>REJECTED_DRY_RUN</literal>
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182 </tag-desc>
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183
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184 </list>
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185 </para>
365
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186
76
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187 </section>
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188
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189 </module>