Mercurial > hg > nginx-site
annotate xml/ru/docs/http/ngx_http_limit_conn_module.xml @ 187:cf66ea69aec3
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author | Maxim Konovalov <maxim@nginx.com> |
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date | Sun, 20 Nov 2011 17:46:53 +0000 |
parents | 9e7d0c9c7eaa |
children | 2df68271c898 |
rev | line source |
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Russian documentation import.
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1 <?xml version="1.0" encoding="utf-8"?> |
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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 |
110
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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. |
76
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77 </para> |
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78 |
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79 <para> |
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80 Директивы наследуются с предыдущего уровня при условии, что на данном уровне |
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81 не описаны свои директивы <code>limit_conn</code>. |
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82 </para> |
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83 |
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84 </directive> |
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85 |
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86 |
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87 <directive name="limit_conn_log_level"> |
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88 <syntax> |
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89 <value>info</value> | |
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90 <value>notice</value> | |
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91 <value>warn</value> | |
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92 <value>error</value> |
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93 </syntax> |
102
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94 <default>error</default> |
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95 <context>http</context> |
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96 <context>server</context> |
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97 <context>location</context> |
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98 <appeared-in>0.8.18</appeared-in> |
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99 |
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100 <para> |
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101 Директива задаёт желаемый уровень записи в лог случаев ограничения |
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102 числа соединений. |
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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_zone"> |
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109 <syntax> |
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110 <argument>$переменная </argument> |
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111 <parameter>zone</parameter>=<argument>название</argument>:<argument>размер</argument> |
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112 </syntax> |
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113 <default/> |
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114 <context>http</context> |
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115 |
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116 <para> |
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117 Директива задаёт параметры зоны, которая хранит состояние |
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118 для разных значений ключа. |
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119 Состояние в частности хранит текущее число соединений. |
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120 Ключом является значение заданной переменной. |
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121 Пример использования: |
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122 <example> |
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123 limit_conn_zone $binary_remote_addr zone=addr:10m; |
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124 </example> |
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125 Здесь в качестве ключа используется IP-адрес клиента. |
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126 Обратите внимание, что вместо переменной <var>$remote_addr</var> |
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127 использована переменная <var>$binary_remote_addr</var>. |
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128 Длина значения переменной <var>$remote_addr</var> может колебаться |
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129 от 7 до 15 байт, при этом размер хранимого состояния составляет |
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130 либо 32, либо 64 байта на 32-битных платформах, и всегда 64 |
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131 байта на 64-битных. |
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132 Длина значения переменной <var>$binary_remote_addr</var> всегда |
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133 равна 4 байтам, при этом размер состояния всегда равен 32 байтам |
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134 на 32-битных платформах и 64 байтам на 64-битных. |
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135 В зоне размером 1 мегабайт может разместиться около 32 тысяч состояний |
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136 размером 32 байта, или 16 тысяч состояний размером 64 байта. |
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137 При переполнении зоны в ответ на последующие запросы сервер будет |
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138 возвращать ошибку |
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139 <http-status code="503" text="Service Temporarily Unavailable"/>. |
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140 </para> |
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141 |
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142 </directive> |
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143 |
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144 <directive name="limit_zone"> |
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145 <syntax><argument>$переменная название размер</argument></syntax> |
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146 <default/> |
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147 <context>http</context> |
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148 |
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149 <para> |
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150 Эта директива устарела в версии 1.1.8, вместо неё следует |
180
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151 использовать аналогичную директиву <link id="limit_conn_zone"/> |
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152 с изменённым синтаксисом: |
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153 <note> |
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154 <code>limit_conn_zone </code> |
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155 <argument>$переменная </argument> |
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156 <parameter>zone</parameter>=<argument>название</argument>:<argument>размер</argument>; |
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157 </note> |
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158 </para> |
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159 |
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160 </directive> |
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161 |
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162 </section> |
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163 |
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164 </module> |