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annotate xml/ru/docs/http/ngx_http_limit_req_module.xml @ 364:bb51d3e17dd0

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Style fixed.
author Ruslan Ermilov <ru@nginx.com>
date Fri, 27 Jan 2012 10:39:12 +0000
parents a4fa80755eab
children f4033b9bc4ec
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
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21 <section id="example" name="Пример конфигурации">
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22
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23 <para>
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24 <example>
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25 http {
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26 limit_req_zone $binary_remote_addr zone=one:10m rate=1r/s;
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27
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28 ...
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29
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30 server {
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31
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32 ...
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33
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34 location /search/ {
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35 limit_req zone=one burst=5;
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36 }
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37 </example>
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38 </para>
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39
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40 </section>
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41
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42
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43 <section id="directives" name="Директивы">
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44
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45 <directive name="limit_req">
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46 <syntax>
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47 <literal>zone</literal>=<value>название</value>
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48 [<literal>burst</literal>=<value>число</value>]
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49 [<literal>nodelay</literal>]</syntax>
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50 <default/>
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51 <context>http</context>
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52 <context>server</context>
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53 <context>location</context>
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54
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55 <para>
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56 Директива задаёт зону (zone) и максимально возможные всплески запросов (burst).
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57 Если скорость запросов превышает описанную в зоне,
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58 то их обработка задерживается так, чтобы запросы обрабатывались
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59 с заданной скоростью.
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60 Избыточные запросы задерживаются до тех пор, пока их число
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61 не превысит заданное число всплесков.
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62 В этом случае запрос завершается с ошибкой
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63 <http-status code="503" text="Service Temporarily Unavailable"/>.
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64 По умолчанию число всплесков равно нулю.
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65 Например, директивы
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66 <example>
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67 limit_req_zone $binary_remote_addr zone=one:10m rate=1r/s;
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68
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69 server {
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70 location /search/ {
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71 limit_req zone=one burst=5;
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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 <literal>nodelay</literal>:
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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 <literal>info</literal> |
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92 <literal>notice</literal> |
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93 <literal>warn</literal> |
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94 <literal>error</literal></syntax>
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95 <default>error</default>
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96 <context>http</context>
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97 <context>server</context>
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98 <context>location</context>
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99 <appeared-in>0.8.18</appeared-in>
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100
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101 <para>
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102 Директива задаёт желаемый уровень записи в лог случаев ограничения
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103 числа запросов и задержек при обработке запроса.
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104 Задержки записываются в лог с уровнем на единицу меньшим, чем ограничения,
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105 например, если указано “<literal>limit_req_log_level notice</literal>”,
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106 то задержки будут записываться в лог на уровне <literal>info</literal>.
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107 </para>
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108
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109 </directive>
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110
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111
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112 <directive name="limit_req_zone">
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113 <syntax>
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114 <value>$переменная</value>
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115 <literal>zone</literal>=<value>название</value>:<value>размер</value>
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116 <literal>rate</literal>=<value>скорость</value></syntax>
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117 <default/>
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118 <context>http</context>
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119
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120 <para>
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121 Директива задаёт параметры зоны,
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122 которая хранит состояние для разных значений ключа.
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123 Состояние в частности хранит текущее число запросов.
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124 Ключом является значение заданной переменной.
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125 Пример использования:
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126 <example>
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127 limit_req_zone $binary_remote_addr zone=one:10m rate=1r/s;
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128 </example>
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129 </para>
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130
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131 <para>
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132 В данном случае состояния хранятся в зоне “one” размером 10 мегабайт,
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133 и средняя скорость запросов для этой зоны не может превышать
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134 1 запроса в секунду.
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135 </para>
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136
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137 <para>
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138 В качестве ключа используется IP-адрес клиента.
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139 Обратите внимание, что вместо переменной <var>$remote_addr</var> используется
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140 переменная <var>$binary_remote_addr</var>, позволяющая уменьшить
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141 размер состояния до 64 байт.
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142 В зоне размером 1 мегабайт может разместиться около 16 тысяч состояний
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143 размером 64 байта.
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144 При переполнении зоны в ответ на последующие запросы сервер будет
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145 возвращать ошибку
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146 <http-status code="503" text="Service Temporarily Unavailable"/>.
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147 </para>
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148
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149 <para>
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150 Скорость задаётся в запросах в секунду (r/s).
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151 Если же нужна скорость меньше одного запроса в секунду,
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152 то она задаётся в запросах в минуту (r/m), например,
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153 ползапроса в секунду — это 30r/m.
76
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154 </para>
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155
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156 </directive>
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157
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158 </section>
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159
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160 </module>