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annotate xml/ru/docs/http/ngx_http_limit_req_module.xml @ 222:bfe3eff81d04

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Removed redundant encoding specification.
author Ruslan Ermilov <ru@nginx.com>
date Mon, 05 Dec 2011 07:50:10 +0000
parents 8cc01e2179a9
children b4afc16d1071
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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222
bfe3eff81d04 Removed redundant encoding specification.
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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 ngx_http_limit_req_module (0.7.21) позволяет ограничить число запросов
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13 по заданному ключу или, как частный случай, число запросов с одного IP-адреса.
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14 Ограничение делается с помощью метода “leaky bucket”.
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15 </para>
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16
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17 </section>
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18
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19 <section name="Пример конфигурации" id="example">
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20
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21 <para>
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22 <example>
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23 http {
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24 limit_req_zone $binary_remote_addr zone=one:10m rate=1r/s;
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25
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26 ...
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27
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28 server {
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29
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30 ...
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31
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32 location /search/ {
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33 limit_req zone=one burst=5;
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34 }
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35 </example>
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36 </para>
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37
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38 </section>
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39
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40
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41 <section name="Директивы" id="directives">
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42
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43 <directive name="limit_req">
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44 <syntax>
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45 <parameter>zone</parameter>=<argument>название</argument>
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46 [<parameter>burst</parameter>=<argument>число</argument>]
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47 [<parameter>nodelay</parameter>]
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48 </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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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
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73 </example>
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74 позволяют в среднем не более 1 запроса в секунду
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75 со всплесками не более 5 запросов.
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76 </para>
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78 <para>
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79 Если же избыточные запросы в пределах лимита всплесков задерживать
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80 не требуется, то следует использовать параметр <parameter>nodelay</parameter>:
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81 <example>
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82 limit_req zone=one burst=5 nodelay;
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83 </example>
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84 </para>
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85
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86 </directive>
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87
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88
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89 <directive name="limit_req_log_level">
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90 <syntax>
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91 <value>info</value> |
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92 <value>notice</value> |
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93 <value>warn</value> |
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94 <value>error</value>
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95 </syntax>
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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 Директива задаёт желаемый уровень записи в лог случаев ограничения
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104 числа запросов и задержек при обработке запроса.
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105 Задержки записываются в лог с уровнем на единицу меньшим, чем ограничения,
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106 например, если указано <command>limit_req_log_level notice</command>,
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107 то задержки будут записываться в лог на уровне <value>info</value>.
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108 </para>
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109
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110 </directive>
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111
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112
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113 <directive name="limit_req_zone">
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114 <syntax>
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115 <argument>$переменная </argument>
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116 <parameter>zone</parameter>=<argument>название</argument>:<argument>размер </argument>
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117 <parameter>rate</parameter>=<argument>скорость</argument>
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118 </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>
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123 Директива 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 запросов.
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126 Ключом является значение заданной переменной.
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127 Пример использования:
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128 <example>
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129 limit_req_zone $binary_remote_addr zone=one:10m rate=1r/s;
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130 </example>
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131 </para>
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132
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133 <para>
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134 В данном случае состояния хранятся в зоне “one” размером 10 мегабайт,
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135 и средняя скорость запросов для этой зоны не может превышать
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136 1 запроса в секунду.
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137 </para>
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138
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139 <para>
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140 В качестве ключа используется IP-адрес клиента.
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141 Обратите внимание, что вместо переменной <var>$remote_addr</var> используется
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142 переменная <var>$binary_remote_addr</var>, позволяющая уменьшить
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143 размер состояния до 64 байт.
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144 В зоне размером 1 мегабайт может разместиться около 16 тысяч состояний
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145 размером 64 байта.
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146 При переполнении зоны в ответ на последующие запросы сервер будет
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147 возвращать ошибку
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148 <http-status code="503" text="Service Temporarily Unavailable"/>.
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149 </para>
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150
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151 <para>
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152 Скорость задаётся в запросах в секунду (r/s).
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153 Если же нужна скорость меньше одного запроса в секунду,
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154 то она задаётся в запросах в минуту (r/m), например,
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155 ползапроса в секунду — это 30r/m.
76
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156 </para>
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157
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158 </directive>
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159
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160 </section>
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161
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162 </module>