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annotate xml/ru/docs/http/ngx_http_limit_req_module.xml @ 580:be54c443235a

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Added copyright markers to documentation sources.
author Ruslan Ermilov <ru@nginx.com>
date Tue, 10 Jul 2012 12:59:42 +0000
parents ebcb351d9eb3
children 764fbac1b8b4
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 <?xml version="1.0"?>
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2
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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
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14 <section id="summary">
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15
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16 <para>
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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
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26
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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
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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>
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53 <literal>zone</literal>=<value>название</value>
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54 [<literal>burst</literal>=<value>число</value>]
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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
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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>
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98 <literal>info</literal> |
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99 <literal>notice</literal> |
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100 <literal>warn</literal> |
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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,
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113 например, если указано “<literal>limit_req_log_level notice</literal>”,
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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>
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122 <value>$переменная</value>
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123 <literal>zone</literal>=<value>название</value>:<value>размер</value>
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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 $binary_remote_addr zone=one:10m rate=1r/s;
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137 </example>
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138 </para>
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139
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140 <para>
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141 В данном случае состояния хранятся в зоне “one” размером 10 мегабайт,
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142 и средняя скорость обработки запросов для этой зоны не может превышать
179
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143 1 запроса в секунду.
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144 </para>
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145
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146 <para>
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147 В качестве ключа используется IP-адрес клиента.
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148 Обратите внимание, что вместо переменной <var>$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>