Mercurial > hg > nginx-site
annotate xml/ru/docs/http/ngx_http_limit_conn_module.xml @ 444:43c84d19bf92
Added a note about the NGINX environment variable.
author | Ruslan Ermilov <ru@nginx.com> |
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date | Mon, 12 Mar 2012 12:32:04 +0000 |
parents | bef9e1a2e3c8 |
children | ebcb351d9eb3 |
rev | line source |
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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> |
271 | 12 Модуль <literal>ngx_http_limit_conn_module</literal> 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 |
365 | 25 <section id="example" name="Пример конфигурации"> |
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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 |
365 | 47 <section id="directives" name="Директивы"> |
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48 |
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49 <directive name="limit_conn"> |
271 | 50 <syntax><value>зона</value> <value>число</value></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> |
380 | 57 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> |
271 | 75 Допустимо одновременное указание нескольких директив |
76 <literal>limit_conn</literal>, | |
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77 при этом будет срабатывать любое из ограничений. |
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78 Например, следующая конфигурация ограничивает число соединений с сервером |
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79 с одного клиентского IP-адреса и в то же время ограничивает общее число |
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80 соединений с виртуальным хостом: |
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81 <example> |
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82 limit_conn_zone $binary_remote_addr zone=perip:10m; |
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83 limit_conn_zone $server_name zone=perserver:10m; |
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84 |
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85 server { |
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86 ... |
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87 limit_conn perip 10; |
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88 limit_conn perserver 100; |
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89 } |
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90 </example> |
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91 |
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92 </para> |
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93 |
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94 <para> |
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95 Директивы наследуются с предыдущего уровня при условии, что на данном уровне |
271 | 96 не описаны свои директивы <literal>limit_conn</literal>. |
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97 </para> |
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98 |
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99 </directive> |
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100 |
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101 |
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102 <directive name="limit_conn_log_level"> |
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103 <syntax> |
271 | 104 <literal>info</literal> | |
105 <literal>notice</literal> | | |
106 <literal>warn</literal> | | |
107 <literal>error</literal></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> |
380 | 115 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> |
271 | 124 <value>$переменная</value> |
125 <literal>zone</literal>=<value>название</value>:<value>размер</value></syntax> | |
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126 <default/> |
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127 <context>http</context> |
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128 |
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129 <para> |
380 | 130 Задаёт параметры зоны, которая хранит состояние |
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131 для разных значений ключа. |
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132 Состояние в частности хранит текущее число соединений. |
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133 Ключом является любое непустое значение заданной переменной |
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134 (пустые значения не учитываются). |
179
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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>$binary_remote_addr</var> всегда |
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147 равна 4 байтам, при этом размер состояния всегда равен 32 байтам |
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148 на 32-битных платформах и 64 байтам на 64-битных. |
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149 В зоне размером 1 мегабайт может разместиться около 32 тысяч состояний |
179
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150 размером 32 байта, или 16 тысяч состояний размером 64 байта. |
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151 При переполнении зоны в ответ на последующие запросы сервер будет |
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152 возвращать ошибку |
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153 <http-status code="503" text="Service Temporarily Unavailable"/>. |
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154 </para> |
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155 |
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156 </directive> |
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157 |
365 | 158 |
179
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159 <directive name="limit_zone"> |
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160 <syntax> |
271 | 161 <value>название</value> |
162 <value>$переменная</value> | |
163 <value>размер</value></syntax> | |
179
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164 <default/> |
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165 <context>http</context> |
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166 |
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167 <para> |
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168 Эта директива устарела в версии 1.1.8, вместо неё следует |
180
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169 использовать аналогичную директиву <link id="limit_conn_zone"/> |
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170 с изменённым синтаксисом: |
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171 <note> |
271 | 172 <literal>limit_conn_zone</literal> |
173 <value>$переменная</value> | |
174 <literal>zone</literal>=<value>название</value>:<value>размер</value>; | |
180
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175 </note> |
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176 </para> |
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177 |
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178 </directive> |
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179 |
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180 </section> |
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181 |
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182 </module> |