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annotate xml/ru/docs/http/ngx_http_limit_req_module.xml @ 351:a4fa80755eab

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Consistently strip initial offset in examples.
author Ruslan Ermilov <ru@nginx.com>
date Tue, 24 Jan 2012 11:01:22 +0000
parents 4c6d2c614d2c
children bb51d3e17dd0
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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>
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12 Модуль <literal>ngx_http_limit_req_module</literal> (0.7.21) позволяет
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13 ограничить число запросов
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14 по заданному ключу или, как частный случай, число запросов с одного IP-адреса.
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15 Ограничение делается с помощью метода “leaky bucket”.
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16 </para>
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17
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18 </section>
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19
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20 <section name="Пример конфигурации" id="example">
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21
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22 <para>
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23 <example>
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24 http {
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25 limit_req_zone $binary_remote_addr zone=one:10m rate=1r/s;
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26
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27 ...
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28
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29 server {
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30
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31 ...
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32
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33 location /search/ {
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34 limit_req zone=one burst=5;
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35 }
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36 </example>
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37 </para>
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38
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39 </section>
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40
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41
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42 <section name="Директивы" id="directives">
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43
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44 <directive name="limit_req">
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45 <syntax>
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46 <literal>zone</literal>=<value>название</value>
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47 [<literal>burst</literal>=<value>число</value>]
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48 [<literal>nodelay</literal>]</syntax>
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49 <default/>
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50 <context>http</context>
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51 <context>server</context>
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52 <context>location</context>
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53
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54 <para>
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55 Директива задаёт зону (zone) и максимально возможные всплески запросов (burst).
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56 Если скорость запросов превышает описанную в зоне,
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57 то их обработка задерживается так, чтобы запросы обрабатывались
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58 с заданной скоростью.
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59 Избыточные запросы задерживаются до тех пор, пока их число
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60 не превысит заданное число всплесков.
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61 В этом случае запрос завершается с ошибкой
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62 <http-status code="503" text="Service Temporarily Unavailable"/>.
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63 По умолчанию число всплесков равно нулю.
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64 Например, директивы
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65 <example>
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66 limit_req_zone $binary_remote_addr zone=one:10m rate=1r/s;
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67
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68 server {
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69 location /search/ {
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70 limit_req zone=one burst=5;
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71 }
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72 </example>
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73 позволяют в среднем не более 1 запроса в секунду
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74 со всплесками не более 5 запросов.
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75 </para>
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77 <para>
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78 Если же избыточные запросы в пределах лимита всплесков задерживать
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79 не требуется, то следует использовать параметр <literal>nodelay</literal>:
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80 <example>
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81 limit_req zone=one burst=5 nodelay;
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82 </example>
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83 </para>
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84
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85 </directive>
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87
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88 <directive name="limit_req_log_level">
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89 <syntax>
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90 <literal>info</literal> |
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91 <literal>notice</literal> |
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92 <literal>warn</literal> |
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93 <literal>error</literal></syntax>
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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 запросов и задержек при обработке запроса.
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103 Задержки записываются в лог с уровнем на единицу меньшим, чем ограничения,
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104 например, если указано “<literal>limit_req_log_level notice</literal>”,
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105 то задержки будут записываться в лог на уровне <literal>info</literal>.
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106 </para>
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107
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108 </directive>
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109
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110
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111 <directive name="limit_req_zone">
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112 <syntax>
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113 <value>$переменная</value>
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114 <literal>zone</literal>=<value>название</value>:<value>размер</value>
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115 <literal>rate</literal>=<value>скорость</value></syntax>
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116 <default/>
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117 <context>http</context>
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118
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119 <para>
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120 Директива задаёт параметры зоны,
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121 которая хранит состояние для разных значений ключа.
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122 Состояние в частности хранит текущее число запросов.
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123 Ключом является значение заданной переменной.
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124 Пример использования:
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125 <example>
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126 limit_req_zone $binary_remote_addr zone=one:10m rate=1r/s;
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127 </example>
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128 </para>
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129
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130 <para>
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131 В данном случае состояния хранятся в зоне “one” размером 10 мегабайт,
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132 и средняя скорость запросов для этой зоны не может превышать
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133 1 запроса в секунду.
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134 </para>
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135
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136 <para>
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137 В качестве ключа используется IP-адрес клиента.
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138 Обратите внимание, что вместо переменной <var>$remote_addr</var> используется
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139 переменная <var>$binary_remote_addr</var>, позволяющая уменьшить
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140 размер состояния до 64 байт.
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141 В зоне размером 1 мегабайт может разместиться около 16 тысяч состояний
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142 размером 64 байта.
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143 При переполнении зоны в ответ на последующие запросы сервер будет
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144 возвращать ошибку
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145 <http-status code="503" text="Service Temporarily Unavailable"/>.
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146 </para>
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147
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148 <para>
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149 Скорость задаётся в запросах в секунду (r/s).
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150 Если же нужна скорость меньше одного запроса в секунду,
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151 то она задаётся в запросах в минуту (r/m), например,
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152 ползапроса в секунду — это 30r/m.
76
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153 </para>
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154
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155 </directive>
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156
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157 </section>
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158
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159 </module>