Mercurial > hg > nginx-site
annotate xml/ru/docs/http/ngx_http_limit_conn_module.xml @ 674:c48c0936b4df
Documented internal redirections limit.
author | Vladimir Homutov <vl@nginx.com> |
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date | Fri, 07 Sep 2012 13:00:26 +0000 |
parents | 764fbac1b8b4 |
children | 6087d3fa6919 |
rev | line source |
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222
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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" |
589 | 12 lang="ru" |
13 rev="1"> | |
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14 |
110
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15 <section id="summary"> |
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16 |
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17 <para> |
271 | 18 Модуль <literal>ngx_http_limit_conn_module</literal> позволяет ограничить |
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19 число соединений по заданному ключу или, |
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20 как частный случай, число соединений с одного IP-адреса. |
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21 </para> |
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22 |
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23 <para> |
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24 Ограничиваются не любые 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 |
365 | 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 |
365 | 53 <section id="directives" name="Директивы"> |
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54 |
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55 <directive name="limit_conn"> |
271 | 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 </para> |
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79 |
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80 <para> |
271 | 81 Допустимо одновременное указание нескольких директив |
82 <literal>limit_conn</literal>, | |
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83 при этом будет срабатывать любое из ограничений. |
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84 Например, следующая конфигурация ограничивает число соединений с сервером |
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85 с одного клиентского IP-адреса и в то же время ограничивает общее число |
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86 соединений с виртуальным хостом: |
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87 <example> |
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88 limit_conn_zone $binary_remote_addr zone=perip:10m; |
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89 limit_conn_zone $server_name zone=perserver:10m; |
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90 |
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91 server { |
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92 ... |
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93 limit_conn perip 10; |
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94 limit_conn perserver 100; |
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95 } |
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96 </example> |
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97 |
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98 </para> |
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99 |
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100 <para> |
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101 Директивы наследуются с предыдущего уровня при условии, что на данном уровне |
271 | 102 не описаны свои директивы <literal>limit_conn</literal>. |
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103 </para> |
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104 |
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105 </directive> |
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106 |
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107 |
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108 <directive name="limit_conn_log_level"> |
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109 <syntax> |
271 | 110 <literal>info</literal> | |
111 <literal>notice</literal> | | |
112 <literal>warn</literal> | | |
113 <literal>error</literal></syntax> | |
102
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114 <default>error</default> |
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115 <context>http</context> |
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116 <context>server</context> |
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117 <context>location</context> |
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118 <appeared-in>0.8.18</appeared-in> |
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119 |
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120 <para> |
380 | 121 Задаёт желаемый уровень записи в лог случаев ограничения |
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122 числа соединений. |
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123 </para> |
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124 |
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125 </directive> |
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126 |
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127 |
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128 <directive name="limit_conn_zone"> |
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129 <syntax> |
271 | 130 <value>$переменная</value> |
131 <literal>zone</literal>=<value>название</value>:<value>размер</value></syntax> | |
179
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132 <default/> |
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133 <context>http</context> |
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134 |
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135 <para> |
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136 Задаёт параметры зоны разделяемой памяти, которая хранит состояние |
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137 для разных значений ключа. |
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138 Состояние в частности хранит текущее число соединений. |
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139 Ключом является любое непустое значение заданной переменной |
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140 (пустые значения не учитываются). |
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141 Пример использования: |
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142 <example> |
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143 limit_conn_zone $binary_remote_addr zone=addr:10m; |
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144 </example> |
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145 Здесь в качестве ключа используется IP-адрес клиента. |
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146 Обратите внимание, что вместо переменной <var>$remote_addr</var> |
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147 использована переменная <var>$binary_remote_addr</var>. |
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148 Длина значения переменной <var>$remote_addr</var> может колебаться |
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149 от 7 до 15 байт, при этом размер хранимого состояния составляет |
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150 либо 32, либо 64 байта на 32-битных платформах, и всегда 64 |
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151 байта на 64-битных. |
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152 Длина значения переменной <var>$binary_remote_addr</var> всегда |
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153 равна 4 байтам, при этом размер состояния всегда равен 32 байтам |
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154 на 32-битных платформах и 64 байтам на 64-битных. |
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155 В зоне размером 1 мегабайт может разместиться около 32 тысяч состояний |
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156 размером 32 байта, или 16 тысяч состояний размером 64 байта. |
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157 При переполнении зоны в ответ на последующие запросы сервер будет |
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158 возвращать ошибку |
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159 <http-status code="503" text="Service Temporarily Unavailable"/>. |
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160 </para> |
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161 |
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162 </directive> |
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163 |
365 | 164 |
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165 <directive name="limit_zone"> |
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166 <syntax> |
271 | 167 <value>название</value> |
168 <value>$переменная</value> | |
169 <value>размер</value></syntax> | |
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170 <default/> |
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171 <context>http</context> |
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172 |
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173 <para> |
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174 Эта директива устарела в версии 1.1.8, вместо неё следует |
180
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175 использовать аналогичную директиву <link id="limit_conn_zone"/> |
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176 с изменённым синтаксисом: |
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177 <note> |
271 | 178 <literal>limit_conn_zone</literal> |
179 <value>$переменная</value> | |
180 <literal>zone</literal>=<value>название</value>:<value>размер</value>; | |
180
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181 </note> |
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182 </para> |
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183 |
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184 </directive> |
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185 |
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186 </section> |
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187 |
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188 </module> |