Mercurial > hg > nginx-site
annotate xml/ru/docs/http/ngx_http_limit_req_module.xml @ 552:32bde52db92c
Incorporated some of the changes made to a translated version of
this document.
author | Ruslan Ermilov <ru@nginx.com> |
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date | Tue, 26 Jun 2012 07:34:58 +0000 |
parents | d477ae38c0bd |
children | ebcb351d9eb3 |
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_req_module" |
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6 link="/ru/docs/http/ngx_http_limit_req_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_req_module</literal> (0.7.21) позволяет |
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13 ограничить скорость обработки запросов по заданному ключу или, |
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14 как частный случай, скорость обработки запросов, поступающих |
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15 с одного IP-адреса. |
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16 Ограничение обеспечивается с помощью метода “leaky bucket”. |
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17 </para> |
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18 |
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19 </section> |
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20 |
364 | 21 |
22 <section id="example" name="Пример конфигурации"> | |
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23 |
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24 <para> |
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25 <example> |
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26 http { |
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27 limit_req_zone $binary_remote_addr zone=one:10m rate=1r/s; |
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28 |
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29 ... |
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30 |
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31 server { |
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32 |
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33 ... |
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34 |
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35 location /search/ { |
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36 limit_req zone=one burst=5; |
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37 } |
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38 </example> |
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39 </para> |
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40 |
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41 </section> |
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42 |
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43 |
364 | 44 <section id="directives" name="Директивы"> |
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45 |
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46 <directive name="limit_req"> |
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47 <syntax> |
271 | 48 <literal>zone</literal>=<value>название</value> |
49 [<literal>burst</literal>=<value>число</value>] | |
50 [<literal>nodelay</literal>]</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 зону (zone) и максимально возможные всплески запросов (burst). |
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58 Если скорость поступления запросов превышает описанную в зоне, |
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59 то их обработка задерживается так, чтобы запросы обрабатывались |
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60 с заданной скоростью. |
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61 Избыточные запросы задерживаются до тех пор, пока их число |
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62 не превысит заданное число всплесков. |
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63 При превышении запрос завершается с ошибкой |
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64 <http-status code="503" text="Service Temporarily Unavailable"/>. |
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65 По умолчанию число всплесков равно нулю. |
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66 Например, директивы |
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67 <example> |
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68 limit_req_zone $binary_remote_addr zone=one:10m rate=1r/s; |
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69 |
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70 server { |
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71 location /search/ { |
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72 limit_req zone=one burst=5; |
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73 } |
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74 </example> |
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75 позволяют в среднем не более 1 запроса в секунду |
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76 со всплесками не более 5 запросов. |
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77 </para> |
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78 |
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79 <para> |
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80 Если же избыточные запросы в пределах лимита всплесков задерживать |
271 | 81 не требуется, то следует использовать параметр <literal>nodelay</literal>: |
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82 <example> |
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83 limit_req zone=one burst=5 nodelay; |
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84 </example> |
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85 </para> |
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86 |
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87 </directive> |
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88 |
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89 |
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90 <directive name="limit_req_log_level"> |
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91 <syntax> |
271 | 92 <literal>info</literal> | |
93 <literal>notice</literal> | | |
94 <literal>warn</literal> | | |
95 <literal>error</literal></syntax> | |
102
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96 <default>error</default> |
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97 <context>http</context> |
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98 <context>server</context> |
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99 <context>location</context> |
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100 <appeared-in>0.8.18</appeared-in> |
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101 |
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102 <para> |
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103 Задаёт желаемый уровень записи в лог |
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104 случаев отказа в обработке запросов при превышении скорости |
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105 и случаев задержек при обработке запроса. |
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106 Задержки записываются в лог с уровнем на единицу меньшим, чем отказы, |
271 | 107 например, если указано “<literal>limit_req_log_level notice</literal>”, |
108 то задержки будут записываться в лог на уровне <literal>info</literal>. | |
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109 </para> |
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110 |
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111 </directive> |
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112 |
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113 |
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114 <directive name="limit_req_zone"> |
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115 <syntax> |
271 | 116 <value>$переменная</value> |
117 <literal>zone</literal>=<value>название</value>:<value>размер</value> | |
118 <literal>rate</literal>=<value>скорость</value></syntax> | |
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119 <default/> |
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120 <context>http</context> |
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121 |
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122 <para> |
380 | 123 Задаёт параметры зоны, |
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124 которая хранит состояние для разных значений ключа. |
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125 Состояние в частности хранит текущее число избыточных запросов. |
390
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126 Ключом является любое непустое значение заданной переменной |
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127 (пустые значения не учитываются). |
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128 Пример использования: |
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129 <example> |
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130 limit_req_zone $binary_remote_addr zone=one:10m rate=1r/s; |
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131 </example> |
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132 </para> |
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133 |
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134 <para> |
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135 В данном случае состояния хранятся в зоне “one” размером 10 мегабайт, |
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136 и средняя скорость обработки запросов для этой зоны не может превышать |
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137 1 запроса в секунду. |
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138 </para> |
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139 |
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140 <para> |
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141 В качестве ключа используется IP-адрес клиента. |
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142 Обратите внимание, что вместо переменной <var>$remote_addr</var> используется |
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143 переменная <var>$binary_remote_addr</var>, позволяющая уменьшить |
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144 размер состояния до 64 байт. |
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145 В зоне размером 1 мегабайт может разместиться около 16 тысяч состояний |
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146 размером 64 байта. |
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147 При переполнении зоны в ответ на последующие запросы сервер будет |
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148 возвращать ошибку |
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149 <http-status code="503" text="Service Temporarily Unavailable"/>. |
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150 </para> |
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151 |
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152 <para> |
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153 Скорость задаётся в запросах в секунду (r/s). |
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154 Если же нужна скорость меньше одного запроса в секунду, |
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155 то она задаётся в запросах в минуту (r/m), например, |
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156 ползапроса в секунду — это 30r/m. |
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157 </para> |
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158 |
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159 </directive> |
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160 |
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161 </section> |
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162 |
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163 </module> |