Mercurial > hg > nginx-site
annotate xml/ru/docs/http/ngx_http_limit_req_module.xml @ 580:be54c443235a
Added copyright markers to documentation sources.
author | Ruslan Ermilov <ru@nginx.com> |
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date | Tue, 10 Jul 2012 12:59:42 +0000 |
parents | ebcb351d9eb3 |
children | 764fbac1b8b4 |
rev | line source |
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222
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1 <?xml version="1.0"?> |
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2 |
580
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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_req_module" |
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11 link="/ru/docs/http/ngx_http_limit_req_module.html" |
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12 lang="ru"> |
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13 |
110
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14 <section id="summary"> |
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15 |
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16 <para> |
271 | 17 Модуль <literal>ngx_http_limit_req_module</literal> (0.7.21) позволяет |
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18 ограничить скорость обработки запросов по заданному ключу или, |
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19 как частный случай, скорость обработки запросов, поступающих |
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20 с одного IP-адреса. |
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21 Ограничение обеспечивается с помощью метода “leaky bucket”. |
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22 </para> |
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23 |
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24 </section> |
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25 |
364 | 26 |
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 http { |
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32 limit_req_zone $binary_remote_addr zone=one:10m rate=1r/s; |
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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 location /search/ { |
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41 limit_req zone=one burst=5; |
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42 } |
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43 </example> |
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44 </para> |
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45 |
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46 </section> |
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47 |
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48 |
364 | 49 <section id="directives" name="Директивы"> |
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50 |
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51 <directive name="limit_req"> |
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52 <syntax> |
271 | 53 <literal>zone</literal>=<value>название</value> |
54 [<literal>burst</literal>=<value>число</value>] | |
55 [<literal>nodelay</literal>]</syntax> | |
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56 <default/> |
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57 <context>http</context> |
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58 <context>server</context> |
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59 <context>location</context> |
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60 |
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61 <para> |
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62 Задаёт зону разделяемой памяти (<literal>zone</literal>) |
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63 и максимально возможные всплески запросов (<literal>burst</literal>). |
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64 Если скорость поступления запросов превышает описанную в зоне, |
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65 то их обработка задерживается так, чтобы запросы обрабатывались |
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66 с заданной скоростью. |
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67 Избыточные запросы задерживаются до тех пор, пока их число |
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68 не превысит заданное число всплесков. |
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69 При превышении запрос завершается с ошибкой |
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70 <http-status code="503" text="Service Temporarily Unavailable"/>. |
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71 По умолчанию число всплесков равно нулю. |
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72 Например, директивы |
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73 <example> |
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74 limit_req_zone $binary_remote_addr zone=one:10m rate=1r/s; |
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75 |
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76 server { |
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77 location /search/ { |
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78 limit_req zone=one burst=5; |
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79 } |
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80 </example> |
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81 позволяют в среднем не более 1 запроса в секунду |
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82 со всплесками не более 5 запросов. |
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83 </para> |
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84 |
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85 <para> |
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86 Если же избыточные запросы в пределах лимита всплесков задерживать |
271 | 87 не требуется, то следует использовать параметр <literal>nodelay</literal>: |
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88 <example> |
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89 limit_req zone=one burst=5 nodelay; |
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90 </example> |
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91 </para> |
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92 |
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93 </directive> |
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94 |
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95 |
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96 <directive name="limit_req_log_level"> |
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97 <syntax> |
271 | 98 <literal>info</literal> | |
99 <literal>notice</literal> | | |
100 <literal>warn</literal> | | |
101 <literal>error</literal></syntax> | |
102
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102 <default>error</default> |
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103 <context>http</context> |
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104 <context>server</context> |
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105 <context>location</context> |
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106 <appeared-in>0.8.18</appeared-in> |
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107 |
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108 <para> |
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109 Задаёт желаемый уровень записи в лог |
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110 случаев отказа в обработке запросов при превышении скорости |
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111 и случаев задержек при обработке запроса. |
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112 Задержки записываются в лог с уровнем на единицу меньшим, чем отказы, |
271 | 113 например, если указано “<literal>limit_req_log_level notice</literal>”, |
114 то задержки будут записываться в лог на уровне <literal>info</literal>. | |
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115 </para> |
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116 |
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117 </directive> |
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118 |
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119 |
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120 <directive name="limit_req_zone"> |
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121 <syntax> |
271 | 122 <value>$переменная</value> |
123 <literal>zone</literal>=<value>название</value>:<value>размер</value> | |
124 <literal>rate</literal>=<value>скорость</value></syntax> | |
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125 <default/> |
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126 <context>http</context> |
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127 |
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128 <para> |
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129 Задаёт параметры зоны разделяемой памяти, |
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130 которая хранит состояние для разных значений ключа. |
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131 Состояние в частности хранит текущее число избыточных запросов. |
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132 Ключом является любое непустое значение заданной переменной |
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133 (пустые значения не учитываются). |
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134 Пример использования: |
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135 <example> |
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136 limit_req_zone $binary_remote_addr zone=one:10m rate=1r/s; |
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137 </example> |
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138 </para> |
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139 |
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140 <para> |
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141 В данном случае состояния хранятся в зоне “one” размером 10 мегабайт, |
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142 и средняя скорость обработки запросов для этой зоны не может превышать |
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143 1 запроса в секунду. |
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144 </para> |
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145 |
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146 <para> |
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147 В качестве ключа используется IP-адрес клиента. |
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148 Обратите внимание, что вместо переменной <var>$remote_addr</var> используется |
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149 переменная <var>$binary_remote_addr</var>, позволяющая уменьшить |
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150 размер состояния до 64 байт. |
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151 В зоне размером 1 мегабайт может разместиться около 16 тысяч состояний |
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152 размером 64 байта. |
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153 При переполнении зоны в ответ на последующие запросы сервер будет |
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154 возвращать ошибку |
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155 <http-status code="503" text="Service Temporarily Unavailable"/>. |
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156 </para> |
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157 |
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158 <para> |
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159 Скорость задаётся в запросах в секунду (r/s). |
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160 Если же нужна скорость меньше одного запроса в секунду, |
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161 то она задаётся в запросах в минуту (r/m), например, |
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162 ползапроса в секунду — это 30r/m. |
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163 </para> |
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164 |
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165 </directive> |
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166 |
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167 </section> |
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168 |
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169 </module> |