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annotate xml/ru/docs/http/ngx_http_limit_req_module.xml @ 2462:63a2a3dc3d63

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Documented the $limit_req_status variable.
author Yaroslav Zhuravlev <yar@nginx.com>
date Fri, 15 Nov 2019 15:52:43 +0300
parents 384211f17f5a
children e4332b7580bb
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 <!--
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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 rev="13">
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14
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15 <section id="summary">
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16
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17 <para>
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18 Модуль <literal>ngx_http_limit_req_module</literal> (0.7.21) позволяет
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19 ограничить скорость обработки запросов по заданному ключу или,
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20 как частный случай, скорость обработки запросов, поступающих
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21 с одного IP-адреса.
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22 Ограничение обеспечивается с помощью метода “leaky bucket”.
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23 </para>
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24
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25 </section>
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26
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27
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28 <section id="example" name="Пример конфигурации">
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30 <para>
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31 <example>
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32 http {
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33 limit_req_zone $binary_remote_addr zone=one:10m rate=1r/s;
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34
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35 ...
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36
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37 server {
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38
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39 ...
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40
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41 location /search/ {
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42 limit_req zone=one burst=5;
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43 }
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44 </example>
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45 </para>
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46
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47 </section>
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48
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49
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50 <section id="directives" name="Директивы">
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51
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52 <directive name="limit_req">
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53 <syntax>
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54 <literal>zone</literal>=<value>название</value>
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55 [<literal>burst</literal>=<value>число</value>]
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56 [<literal>nodelay</literal> |
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57 <literal>delay</literal>=<value>число</value>]</syntax>
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58 <default/>
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59 <context>http</context>
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60 <context>server</context>
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61 <context>location</context>
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63 <para>
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64 Задаёт зону разделяемой памяти (<literal>zone</literal>)
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65 и максимальный размер всплеска запросов (<literal>burst</literal>).
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66 Если скорость поступления запросов превышает описанную в зоне,
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67 то их обработка задерживается так, чтобы запросы обрабатывались
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68 с заданной скоростью.
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69 Избыточные запросы задерживаются до тех пор, пока их число
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70 не превысит максимальный размер всплеска.
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71 При превышении запрос завершается с
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72 <link id="limit_req_status">ошибкой</link>.
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73 По умолчанию максимальный размер всплеска равен нулю.
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74 Например, директивы
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75 <example>
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76 limit_req_zone $binary_remote_addr zone=one:10m rate=1r/s;
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77
351
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78 server {
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79 location /search/ {
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80 limit_req zone=one burst=5;
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81 }
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82 </example>
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83 позволяют в среднем не более 1 запроса в секунду
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84 со всплесками не более 5 запросов.
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85 </para>
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86
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87 <para>
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88 Если же избыточные запросы в пределах лимита всплесков задерживать
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89 не требуется, то следует использовать параметр <literal>nodelay</literal>:
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90 <example>
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91 limit_req zone=one burst=5 nodelay;
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92 </example>
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93 </para>
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94
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95 <para id="limit_req_delay">
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96 Параметр <literal>delay</literal> (1.15.7) задаёт лимит,
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97 по достижении которого избыточные запросы задерживаются.
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98 Значение по умолчанию равно нулю и означает,
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99 что задерживаются все избыточные запросы.
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100 </para>
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101
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102 <para>
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103 Директив <literal>limit_req</literal> может быть несколько.
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104 Например, следующая конфигурация ограничивает скорость обработки запросов,
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105 поступающих с одного IP-адреса, и в то же время ограничивает
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106 скорость обработки запросов одним виртуальным сервером:
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107 <example>
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108 limit_req_zone $binary_remote_addr zone=perip:10m rate=1r/s;
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109 limit_req_zone $server_name zone=perserver:10m rate=10r/s;
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110
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111 server {
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112 ...
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113 limit_req zone=perip burst=5 nodelay;
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114 limit_req zone=perserver burst=10;
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115 }
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116 </example>
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117
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118 </para>
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119
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120 <para>
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121 Директивы наследуются с предыдущего уровня при условии, что на данном уровне
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122 не описаны свои директивы <literal>limit_req</literal>.
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123 </para>
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124
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125 </directive>
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126
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127
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128 <directive name="limit_req_dry_run">
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129 <syntax><literal>on</literal> | <literal>off</literal></syntax>
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130 <default>off</default>
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131 <context>http</context>
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132 <context>server</context>
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133 <context>location</context>
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134 <appeared-in>1.17.1</appeared-in>
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135
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136 <para>
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137 Включает режим пробного запуска.
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138 В данном режиме скорость обработки запросов не ограничивается, однако
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139 в зоне разделяемой памяти текущее число избыточных запросов учитывается
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140 как обычно.
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141 </para>
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142
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143 </directive>
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144
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145
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146 <directive name="limit_req_log_level">
179
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147 <syntax>
271
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148 <literal>info</literal> |
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149 <literal>notice</literal> |
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150 <literal>warn</literal> |
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151 <literal>error</literal></syntax>
102
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152 <default>error</default>
179
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153 <context>http</context>
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154 <context>server</context>
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155 <context>location</context>
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156 <appeared-in>0.8.18</appeared-in>
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157
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158 <para>
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159 Задаёт желаемый уровень записи в лог
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160 случаев отказа в обработке запросов при превышении скорости
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161 и случаев задержек при обработке запроса.
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162 Задержки записываются в лог с уровнем на единицу меньшим, чем отказы,
271
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163 например, если указано “<literal>limit_req_log_level notice</literal>”,
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164 то задержки будут записываться в лог на уровне <literal>info</literal>.
179
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165 </para>
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166
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167 </directive>
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168
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169
870
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170 <directive name="limit_req_status">
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171 <syntax><value>код</value></syntax>
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172 <default>503</default>
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173 <context>http</context>
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174 <context>server</context>
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175 <context>location</context>
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176 <appeared-in>1.3.15</appeared-in>
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177
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178 <para>
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179 Позволяет переопределить код ответа, используемый при отклонении запросов.
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180 </para>
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181
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182 </directive>
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183
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184
179
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185 <directive name="limit_req_zone">
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186 <syntax>
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187 <value>ключ</value>
271
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188 <literal>zone</literal>=<value>название</value>:<value>размер</value>
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189 <literal>rate</literal>=<value>скорость</value>
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190 [<literal>sync</literal>]</syntax>
179
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191 <default/>
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192 <context>http</context>
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193
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194 <para>
575
ebcb351d9eb3 Consistently using the term "shared memory zone".
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195 Задаёт параметры зоны разделяемой памяти,
179
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196 которая хранит состояние для разных значений ключа.
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197 Состояние в частности хранит текущее число избыточных запросов.
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198 В качестве ключа можно использовать текст, переменные и их комбинации.
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199 Запросы с пустым значением ключа не учитываются.
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200 <note>
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201 До версии 1.7.6 в качестве ключа можно было задать ровно одну переменную.
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202 </note>
179
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203 Пример использования:
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204 <example>
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205 limit_req_zone $binary_remote_addr zone=one:10m rate=1r/s;
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206 </example>
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207 </para>
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208
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209 <para>
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210 В данном случае состояния хранятся в зоне “one” размером 10 мегабайт,
529
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diff changeset
211 и средняя скорость обработки запросов для этой зоны не может превышать
179
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diff changeset
212 1 запроса в секунду.
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213 </para>
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214
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215 <para>
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216 В качестве ключа используется IP-адрес клиента.
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diff changeset
217 Обратите внимание, что вместо переменной <var>$remote_addr</var> используется
1699
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218 переменная <var>$binary_remote_addr</var>.
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219 Длина значения переменной <var>$binary_remote_addr</var> всегда
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220 равна 4 байтам для IPv4-адресов или 16 байтам для IPv6-адресов.
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221 При этом размер состояния всегда равен
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diff changeset
222 64 байтам на 32-битных платформах и 128 байтам на 64-битных платформах.
367
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diff changeset
223 В зоне размером 1 мегабайт может разместиться около 16 тысяч состояний
1699
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224 размером 64 байта или около 8 тысяч состояний размером 128 байт.
2014
6e66487c5756 Limit_req: document what happens on zone exhaustion (ticket #1133)
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diff changeset
225 </para>
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226
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227 <para>
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diff changeset
228 При переполнении зоны удаляется наименее востребованное состояние.
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parents: 2013
diff changeset
229 Если и это не позволяет создать новое состояние, запрос завершается с
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diff changeset
230 <link id="limit_req_status">ошибкой</link>.
179
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231 </para>
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232
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233 <para>
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234 Скорость задаётся в запросах в секунду (r/s).
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diff changeset
235 Если же нужна скорость меньше одного запроса в секунду,
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diff changeset
236 то она задаётся в запросах в минуту (r/m), например,
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diff changeset
237 ползапроса в секунду — это 30r/m.
76
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238 </para>
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parents:
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239
2230
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diff changeset
240 <para id="limit_req_zone_sync">
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diff changeset
241 Параметр <literal>sync</literal> (1.15.3) разрешает
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diff changeset
242 <link doc="../stream/ngx_stream_zone_sync_module.xml" id="zone_sync">синхронизацию</link>
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diff changeset
243 данной зоны разделяемой памяти.
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diff changeset
244 <note>
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diff changeset
245 Параметр <literal>sync</literal> доступен как часть
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diff changeset
246 <commercial_version>коммерческой подписки</commercial_version>.
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diff changeset
247 </note>
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diff changeset
248 </para>
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diff changeset
249
76
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250 </directive>
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251
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252 </section>
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253
2462
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parents: 2449
diff changeset
254
63a2a3dc3d63 Documented the $limit_req_status variable.
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parents: 2449
diff changeset
255 <section id="variables" name="Встроенные переменные">
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diff changeset
256
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257 <para>
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258 <list type="tag">
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259
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260 <tag-name id="var_limit_req_status"><var>$limit_req_status</var></tag-name>
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261 <tag-desc>
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262 хранит результат ограничения скорости поступления запросов (1.17.6):
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263 <literal>PASSED</literal>,
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264 <literal>DELAYED</literal>,
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265 <literal>REJECTED</literal>,
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266 <literal>DELAYED_DRY_RUN</literal> или
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267 <literal>REJECTED_DRY_RUN</literal>
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268 </tag-desc>
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269
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270 </list>
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271 </para>
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272
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273 </section>
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274
76
4a4caa566120 Russian documentation import.
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275 </module>