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annotate xml/ru/docs/http/ngx_http_memcached_module.xml @ 1748:be371be7a5c8

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Documented optional port for proxy_bind and friends.
author Yaroslav Zhuravlev <yar@nginx.com>
date Mon, 20 Jun 2016 18:54:46 +0300
parents d855e7cc3b2f
children 6839c258c473
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_memcached_module"
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11 link="/ru/docs/http/ngx_http_memcached_module.html"
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12 lang="ru"
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13 rev="14">
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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_memcached_module</literal> позволяет получать
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19 ответ из сервера memcached.
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20 Ключ задаётся в переменной <var>$memcached_key</var>.
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21 Ответ в memcached должен быть предварительно помещён внешним по отношению
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22 к nginx’у способом.
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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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29
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30 <para>
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31 <example>
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32 server {
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33 location / {
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34 set $memcached_key "$uri?$args";
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35 memcached_pass host:11211;
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36 error_page 404 502 504 = @fallback;
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37 }
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38
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39 location @fallback {
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40 proxy_pass http://backend;
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41 }
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42 }
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43 </example>
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44 </para>
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45
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46 </section>
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47
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48
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49 <section id="directives" name="Директивы">
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50
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51 <directive name="memcached_bind">
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52 <syntax><value>адрес</value> [transparent] | <literal>off</literal></syntax>
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53 <default/>
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54 <context>http</context>
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55 <context>server</context>
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56 <context>location</context>
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57 <appeared-in>0.8.22</appeared-in>
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58
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59 <para>
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60 Задаёт локальный IP-адрес с необязательным портом (1.11.2),
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61 который будет использоваться в исходящих соединениях с сервером memcached.
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62 В значении параметра допустимо использование переменных (1.3.12).
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63 Специальное значение <literal>off</literal> (1.3.12) отменяет действие
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64 унаследованной с предыдущего уровня конфигурации
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65 директивы <literal>memcached_bind</literal>, позволяя системе
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66 самостоятельно выбирать локальный IP-адрес и порт.
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67 </para>
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68
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69 <para id="memcached_bind_transparent">
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70 Параметр <literal>transparent</literal> (1.11.0) позволяет
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71 задать нелокальный IP-aдрес, который будет использоваться в
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72 исходящих соединениях с сервером memcached,
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73 например, реальный IP-адрес клиента:
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74 <example>
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75 memcached_bind $remote_addr transparent;
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76 </example>
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77 Для работы параметра
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78 необходимо запустить рабочие процессы nginx с привилегиями
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79 <link doc="../ngx_core_module.xml" id="user">суперпользователя</link>,
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80 а также настроить таблицу маршрутизации ядра
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81 для перехвата сетевого трафика с сервера memcached.
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82 </para>
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83
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84 </directive>
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85
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86
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87 <directive name="memcached_buffer_size">
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88 <syntax><value>размер</value></syntax>
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89 <default>4k|8k</default>
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90 <context>http</context>
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91 <context>server</context>
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92 <context>location</context>
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93
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94 <para>
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95 Задаёт <value>размер</value> буфера, в который будет читаться ответ,
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96 получаемый от сервера memcached.
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97 Ответ синхронно передаётся клиенту сразу же по мере его поступления.
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98 </para>
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99
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100 </directive>
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101
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102
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103 <directive name="memcached_connect_timeout">
102
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104 <syntax><value>время</value></syntax>
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105 <default>60s</default>
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106 <context>http</context>
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107 <context>server</context>
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108 <context>location</context>
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109
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110 <para>
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111 Задаёт таймаут для установления соединения с сервером memcached.
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112 Необходимо иметь в виду, что этот таймаут обычно не может превышать 75 секунд.
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113 </para>
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114
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115 </directive>
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116
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117
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118 <directive name="memcached_force_ranges">
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119 <syntax><literal>on</literal> | <literal>off</literal></syntax>
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120 <default>off</default>
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121 <context>http</context>
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122 <context>server</context>
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123 <context>location</context>
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124 <appeared-in>1.7.7</appeared-in>
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125
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126 <para>
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127 Включает поддержку диапазонов запрашиваемых байт (byte-range)
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128 для кэшированных и некэшированных ответов сервера memcached
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129 вне зависимости от наличия поля <header>Accept-Ranges</header>
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130 в заголовках этих ответов.
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131 </para>
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132
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133 </directive>
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134
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135
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136 <directive name="memcached_gzip_flag">
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137 <syntax><value>флаг</value></syntax>
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138 <default></default>
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139 <context>http</context>
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140 <context>server</context>
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141 <context>location</context>
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142 <appeared-in>1.3.6</appeared-in>
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143
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144 <para>
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145 Включает проверку указанного <value>флага</value> в ответе
675
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146 сервера memcached и установку поля “<literal>Content-Encoding</literal>”
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147 заголовка ответа в “<literal>gzip</literal>”, если этот флаг установлен.
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148 </para>
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149
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150 </directive>
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151
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152
76
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153 <directive name="memcached_next_upstream">
271
4c6d2c614d2c Cleaned up XML tag mess:
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154 <syntax>
364
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155 <literal>error</literal> |
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156 <literal>timeout</literal> |
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157 <literal>invalid_response</literal> |
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158 <literal>not_found</literal> |
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159 <literal>off</literal>
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160 ...</syntax>
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161 <default>error timeout</default>
361
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162 <context>http</context>
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163 <context>server</context>
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164 <context>location</context>
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165
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166 <para>
361
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167 Определяет, в каких случаях запрос будет передан следующему серверу:
1018108c5068 Revision.
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168 <list type="tag">
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169
361
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170 <tag-name><literal>error</literal></tag-name>
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171 <tag-desc>произошла ошибка соединения с сервером, передачи ему запроса или
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172 чтения заголовка ответа сервера;</tag-desc>
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173
361
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174 <tag-name><literal>timeout</literal></tag-name>
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175 <tag-desc>произошёл таймаут во время соединения с сервером,
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diff changeset
176 передачи ему запроса или чтения заголовка ответа сервера;</tag-desc>
76
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177
361
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178 <tag-name><literal>invalid_response</literal></tag-name>
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179 <tag-desc>сервер вернул пустой или неверный ответ;</tag-desc>
76
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180
361
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181 <tag-name><literal>not_found</literal></tag-name>
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182 <tag-desc>сервер не нашёл ответ;</tag-desc>
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183
361
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184 <tag-name><literal>off</literal></tag-name>
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185 <tag-desc>запрещает передачу запроса следующему серверу.</tag-desc>
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186
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187 </list>
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188 </para>
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189
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190 <para>
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191 Необходимо понимать, что передача запроса следующему серверу возможна
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192 только при условии, что клиенту ещё ничего не передавалось.
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193 То есть, если ошибка или таймаут возникли в середине передачи ответа,
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194 то исправить это уже невозможно.
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195 </para>
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196
942
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197 <para>
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198 Директива также определяет, что считается
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199 <link doc="ngx_http_upstream_module.xml" id="max_fails">неудачной
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200 попыткой</link> работы с сервером.
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201 Случаи <literal>error</literal>, <literal>timeout</literal> и
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202 <literal>invalid_response</literal>
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203 всегда считаются неудачными попытками, даже если они не указаны в директиве.
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204 Случай <literal>not_found</literal>
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205 никогда не считается неудачной попыткой.
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206 </para>
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207
1290
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208 <para>
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209 Передача запроса следующему серверу может быть ограничена по
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210 <link id="memcached_next_upstream_tries">количеству попыток</link>
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211 и по <link id="memcached_next_upstream_timeout">времени</link>.
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212 </para>
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213
f5cc9f2aef9a Proxy/memcached/fastcgi/scgi/uwsgi: _next_upstream_timeout,_next_upstream_tries.
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214 </directive>
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215
f5cc9f2aef9a Proxy/memcached/fastcgi/scgi/uwsgi: _next_upstream_timeout,_next_upstream_tries.
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216
f5cc9f2aef9a Proxy/memcached/fastcgi/scgi/uwsgi: _next_upstream_timeout,_next_upstream_tries.
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217 <directive name="memcached_next_upstream_timeout">
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218 <syntax><value>время</value></syntax>
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219 <default>0</default>
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220 <context>http</context>
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221 <context>server</context>
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222 <context>location</context>
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223 <appeared-in>1.7.5</appeared-in>
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224
f5cc9f2aef9a Proxy/memcached/fastcgi/scgi/uwsgi: _next_upstream_timeout,_next_upstream_tries.
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225 <para>
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226 Ограничивает время, в течение которого возможна передача запроса
f5cc9f2aef9a Proxy/memcached/fastcgi/scgi/uwsgi: _next_upstream_timeout,_next_upstream_tries.
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227 <link id="memcached_next_upstream">следующему серверу</link>.
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228 Значение <literal>0</literal> отключает это ограничение.
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229 </para>
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230
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231 </directive>
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232
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233
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234 <directive name="memcached_next_upstream_tries">
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235 <syntax><value>число</value></syntax>
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236 <default>0</default>
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237 <context>http</context>
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238 <context>server</context>
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239 <context>location</context>
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240 <appeared-in>1.7.5</appeared-in>
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241
f5cc9f2aef9a Proxy/memcached/fastcgi/scgi/uwsgi: _next_upstream_timeout,_next_upstream_tries.
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242 <para>
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243 Ограничивает число допустимых попыток для передачи запроса
f5cc9f2aef9a Proxy/memcached/fastcgi/scgi/uwsgi: _next_upstream_timeout,_next_upstream_tries.
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244 <link id="memcached_next_upstream">следующему серверу</link>.
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245 Значение <literal>0</literal> отключает это ограничение.
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246 </para>
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247
76
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248 </directive>
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parents:
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249
4a4caa566120 Russian documentation import.
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250
4a4caa566120 Russian documentation import.
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251 <directive name="memcached_pass">
361
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252 <syntax><value>адрес</value></syntax>
99
1d315ef37215 The case <default/> is now language-agnostic.
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diff changeset
253 <default/>
361
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diff changeset
254 <context>location</context>
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255 <context>if в location</context>
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256
4a4caa566120 Russian documentation import.
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257 <para>
361
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258 Задаёт адрес сервера memcached.
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259 Адрес может быть указан в виде доменного имени или IP-адреса,
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260 и порта:
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261 <example>
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262 memcached_pass localhost:11211;
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263 </example>
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264 или в виде пути UNIX-сокета:
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265 <example>
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266 memcached_pass unix:/tmp/memcached.socket;
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267 </example>
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268 </para>
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269
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270 <para>
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271 Если доменному имени соответствует несколько адресов, то все они будут
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272 использоваться по очереди (round-robin).
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273 И, кроме того, адрес может быть
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274 <link doc="ngx_http_upstream_module.xml">группой серверов</link>.
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275 </para>
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276
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277 </directive>
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278
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279
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280 <directive name="memcached_read_timeout">
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281 <syntax><value>время</value></syntax>
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282 <default>60s</default>
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283 <context>http</context>
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284 <context>server</context>
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285 <context>location</context>
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286
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287 <para>
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288 Задаёт таймаут при чтении ответа сервера memcached.
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289 Таймаут устанавливается не на всю передачу ответа,
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290 а только между двумя операциями чтения.
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291 Если по истечении этого времени сервер memcached ничего не передаст,
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292 соединение закрывается.
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293 </para>
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294
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295 </directive>
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296
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297
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298 <directive name="memcached_send_timeout">
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299 <syntax><value>время</value></syntax>
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300 <default>60s</default>
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301 <context>http</context>
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302 <context>server</context>
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303 <context>location</context>
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304
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305 <para>
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306 Задаёт таймаут при передаче запроса серверу memcached.
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307 Таймаут устанавливается не на всю передачу запроса,
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308 а только между двумя операциями записи.
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309 Если по истечении этого времени сервер memcached не примет новых данных,
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310 соединение закрывается.
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311 </para>
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312
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313 </directive>
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314
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315 </section>
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316
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317
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318 <section id="variables" name="Встроенные переменные">
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319
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320 <para>
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321 <list type="tag">
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322
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323 <tag-name id="var_memcached_key"><var>$memcached_key</var></tag-name>
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324 <tag-desc>
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325 Задаёт ключ для получения ответа из сервера memcached.
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326 </tag-desc>
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327
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328 </list>
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329 </para>
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330
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331 </section>
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332
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333 </module>