Mercurial > hg > nginx-site
annotate xml/ru/docs/http/ngx_http_limit_conn_module.xml @ 222:bfe3eff81d04
Removed redundant encoding specification.
author | Ruslan Ermilov <ru@nginx.com> |
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date | Mon, 05 Dec 2011 07:50:10 +0000 |
parents | 2df68271c898 |
children | 8fead61b7b03 |
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 <!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> |
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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> |
179
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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> |
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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> |