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annotate xml/ru/docs/http/ngx_http_limit_req_module.xml @ 566:f8148fc88224

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Documented 1.2.2 changes.
author Ruslan Ermilov <ru@nginx.com>
date Tue, 03 Jul 2012 11:26:09 +0000
parents d477ae38c0bd
children ebcb351d9eb3
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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 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
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21
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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
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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>
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48 <literal>zone</literal>=<value>название</value>
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49 [<literal>burst</literal>=<value>число</value>]
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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>
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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
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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>
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92 <literal>info</literal> |
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93 <literal>notice</literal> |
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94 <literal>warn</literal> |
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95 <literal>error</literal></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 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,
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107 например, если указано “<literal>limit_req_log_level notice</literal>”,
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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>
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116 <value>$переменная</value>
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117 <literal>zone</literal>=<value>название</value>:<value>размер</value>
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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>
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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.
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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 $binary_remote_addr zone=one:10m rate=1r/s;
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131 </example>
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132 </para>
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133
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134 <para>
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135 В данном случае состояния хранятся в зоне “one” размером 10 мегабайт,
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136 и средняя скорость обработки запросов для этой зоны не может превышать
179
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137 1 запроса в секунду.
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138 </para>
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139
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140 <para>
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141 В качестве ключа используется IP-адрес клиента.
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142 Обратите внимание, что вместо переменной <var>$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>