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annotate xml/ru/docs/http/ngx_http_memcached_module.xml @ 2846:fdf1464e1977

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Moved banner to the external file to make partial rollout possible. An idea is to have several banners and show them with different probability specified by split directive in the nginx.conf
author Sergey Budnevitch <sb@waeme.net>
date Tue, 10 May 2022 18:07:27 +0400
parents d765ffffd08c
children 53734009b0c3
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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="17">
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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>
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53 <value>адрес</value>
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54 [<literal>transparent </literal>] |
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55 <literal>off</literal></syntax>
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56 <default/>
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57 <context>http</context>
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58 <context>server</context>
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59 <context>location</context>
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60 <appeared-in>0.8.22</appeared-in>
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61
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62 <para>
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63 Задаёт локальный IP-адрес с необязательным портом (1.11.2),
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64 который будет использоваться в исходящих соединениях с сервером memcached.
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65 В значении параметра допустимо использование переменных (1.3.12).
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66 Специальное значение <literal>off</literal> (1.3.12) отменяет действие
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67 унаследованной с предыдущего уровня конфигурации
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68 директивы <literal>memcached_bind</literal>, позволяя системе
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69 самостоятельно выбирать локальный IP-адрес и порт.
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70 </para>
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71
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72 <para id="memcached_bind_transparent">
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73 Параметр <literal>transparent</literal> (1.11.0) позволяет
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74 задать нелокальный IP-aдрес, который будет использоваться в
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75 исходящих соединениях с сервером memcached,
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76 например, реальный IP-адрес клиента:
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77 <example>
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78 memcached_bind $remote_addr transparent;
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79 </example>
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80 Для работы параметра
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81 обычно требуется
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82 запустить рабочие процессы nginx с привилегиями
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83 <link doc="../ngx_core_module.xml" id="user">суперпользователя</link>.
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84 В Linux этого не требуется (1.13.8), так как если
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85 указан параметр <literal>transparent</literal>, то рабочие процессы
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86 наследуют capability <literal>CAP_NET_RAW</literal> из главного процесса.
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87 Также необходимо настроить таблицу маршрутизации ядра
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88 для перехвата сетевого трафика с сервера memcached.
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89 </para>
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90
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91 </directive>
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92
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93
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94 <directive name="memcached_buffer_size">
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95 <syntax><value>размер</value></syntax>
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96 <default>4k|8k</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
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101 <para>
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102 Задаёт <value>размер</value> буфера, в который будет читаться ответ,
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103 получаемый от сервера memcached.
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104 Ответ синхронно передаётся клиенту сразу же по мере его поступления.
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105 </para>
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106
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107 </directive>
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108
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109
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110 <directive name="memcached_connect_timeout">
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111 <syntax><value>время</value></syntax>
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112 <default>60s</default>
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113 <context>http</context>
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114 <context>server</context>
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115 <context>location</context>
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116
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117 <para>
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118 Задаёт таймаут для установления соединения с сервером memcached.
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119 Необходимо иметь в виду, что этот таймаут обычно не может превышать 75 секунд.
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120 </para>
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121
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122 </directive>
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123
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124
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125 <directive name="memcached_force_ranges">
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126 <syntax><literal>on</literal> | <literal>off</literal></syntax>
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127 <default>off</default>
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128 <context>http</context>
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129 <context>server</context>
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130 <context>location</context>
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131 <appeared-in>1.7.7</appeared-in>
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132
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133 <para>
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134 Включает поддержку диапазонов запрашиваемых байт (byte-range)
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135 для кэшированных и некэшированных ответов сервера memcached
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136 вне зависимости от наличия поля <header>Accept-Ranges</header>
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parents: 1290
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137 в заголовках этих ответов.
91a064bdb4f9 Documented the "proxy_force_ranges" directive and friends.
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138 </para>
91a064bdb4f9 Documented the "proxy_force_ranges" directive and friends.
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139
91a064bdb4f9 Documented the "proxy_force_ranges" directive and friends.
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140 </directive>
91a064bdb4f9 Documented the "proxy_force_ranges" directive and friends.
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141
91a064bdb4f9 Documented the "proxy_force_ranges" directive and friends.
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142
675
08140f6b7964 Documented gunzip module and corresponding changes.
Vladimir Homutov <vl@nginx.com>
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143 <directive name="memcached_gzip_flag">
08140f6b7964 Documented gunzip module and corresponding changes.
Vladimir Homutov <vl@nginx.com>
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144 <syntax><value>флаг</value></syntax>
08140f6b7964 Documented gunzip module and corresponding changes.
Vladimir Homutov <vl@nginx.com>
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145 <default></default>
08140f6b7964 Documented gunzip module and corresponding changes.
Vladimir Homutov <vl@nginx.com>
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146 <context>http</context>
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147 <context>server</context>
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148 <context>location</context>
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149 <appeared-in>1.3.6</appeared-in>
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150
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151 <para>
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152 Включает проверку указанного <value>флага</value> в ответе
675
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153 сервера memcached и установку поля “<literal>Content-Encoding</literal>”
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154 заголовка ответа в “<literal>gzip</literal>”, если этот флаг установлен.
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155 </para>
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156
08140f6b7964 Documented gunzip module and corresponding changes.
Vladimir Homutov <vl@nginx.com>
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diff changeset
157 </directive>
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158
08140f6b7964 Documented gunzip module and corresponding changes.
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parents: 589
diff changeset
159
76
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parents:
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160 <directive name="memcached_next_upstream">
271
4c6d2c614d2c Cleaned up XML tag mess:
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diff changeset
161 <syntax>
364
bb51d3e17dd0 Style fixed.
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162 <literal>error</literal> |
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163 <literal>timeout</literal> |
bb51d3e17dd0 Style fixed.
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parents: 361
diff changeset
164 <literal>invalid_response</literal> |
bb51d3e17dd0 Style fixed.
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parents: 361
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165 <literal>not_found</literal> |
bb51d3e17dd0 Style fixed.
Ruslan Ermilov <ru@nginx.com>
parents: 361
diff changeset
166 <literal>off</literal>
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Ruslan Ermilov <ru@nginx.com>
parents: 361
diff changeset
167 ...</syntax>
102
c76a257f3fd4 The directive name is now automatically printed in <default> and <syntax>.
Ruslan Ermilov <ru@nginx.com>
parents: 99
diff changeset
168 <default>error timeout</default>
361
1018108c5068 Revision.
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parents: 296
diff changeset
169 <context>http</context>
1018108c5068 Revision.
Ruslan Ermilov <ru@nginx.com>
parents: 296
diff changeset
170 <context>server</context>
1018108c5068 Revision.
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171 <context>location</context>
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172
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173 <para>
361
1018108c5068 Revision.
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parents: 296
diff changeset
174 Определяет, в каких случаях запрос будет передан следующему серверу:
1018108c5068 Revision.
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diff changeset
175 <list type="tag">
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176
361
1018108c5068 Revision.
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diff changeset
177 <tag-name><literal>error</literal></tag-name>
1018108c5068 Revision.
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diff changeset
178 <tag-desc>произошла ошибка соединения с сервером, передачи ему запроса или
1018108c5068 Revision.
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diff changeset
179 чтения заголовка ответа сервера;</tag-desc>
76
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parents:
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180
361
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diff changeset
181 <tag-name><literal>timeout</literal></tag-name>
1018108c5068 Revision.
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diff changeset
182 <tag-desc>произошёл таймаут во время соединения с сервером,
1018108c5068 Revision.
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parents: 296
diff changeset
183 передачи ему запроса или чтения заголовка ответа сервера;</tag-desc>
76
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184
361
1018108c5068 Revision.
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diff changeset
185 <tag-name><literal>invalid_response</literal></tag-name>
1018108c5068 Revision.
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diff changeset
186 <tag-desc>сервер вернул пустой или неверный ответ;</tag-desc>
76
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parents:
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187
361
1018108c5068 Revision.
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parents: 296
diff changeset
188 <tag-name><literal>not_found</literal></tag-name>
1018108c5068 Revision.
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parents: 296
diff changeset
189 <tag-desc>сервер не нашёл ответ;</tag-desc>
76
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parents:
diff changeset
190
361
1018108c5068 Revision.
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parents: 296
diff changeset
191 <tag-name><literal>off</literal></tag-name>
1018108c5068 Revision.
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diff changeset
192 <tag-desc>запрещает передачу запроса следующему серверу.</tag-desc>
76
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193
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194 </list>
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195 </para>
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196
4a4caa566120 Russian documentation import.
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197 <para>
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parents:
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198 Необходимо понимать, что передача запроса следующему серверу возможна
4a4caa566120 Russian documentation import.
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parents:
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199 только при условии, что клиенту ещё ничего не передавалось.
4a4caa566120 Russian documentation import.
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200 То есть, если ошибка или таймаут возникли в середине передачи ответа,
4a4caa566120 Russian documentation import.
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parents:
diff changeset
201 то исправить это уже невозможно.
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202 </para>
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203
942
ba3d6ade3513 Elaborate on upstream server failures.
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204 <para>
1289
57fc39924d42 Proxy/memcached/fastcgi/scgi/uwsgi: updated link in _next_upstream directives.
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diff changeset
205 Директива также определяет, что считается
57fc39924d42 Proxy/memcached/fastcgi/scgi/uwsgi: updated link in _next_upstream directives.
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206 <link doc="ngx_http_upstream_module.xml" id="max_fails">неудачной
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diff changeset
207 попыткой</link> работы с сервером.
942
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208 Случаи <literal>error</literal>, <literal>timeout</literal> и
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209 <literal>invalid_response</literal>
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210 всегда считаются неудачными попытками, даже если они не указаны в директиве.
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211 Случай <literal>not_found</literal>
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diff changeset
212 никогда не считается неудачной попыткой.
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213 </para>
ba3d6ade3513 Elaborate on upstream server failures.
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diff changeset
214
1290
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215 <para>
f5cc9f2aef9a Proxy/memcached/fastcgi/scgi/uwsgi: _next_upstream_timeout,_next_upstream_tries.
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216 Передача запроса следующему серверу может быть ограничена по
f5cc9f2aef9a Proxy/memcached/fastcgi/scgi/uwsgi: _next_upstream_timeout,_next_upstream_tries.
Yaroslav Zhuravlev <yar@nginx.com>
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217 <link id="memcached_next_upstream_tries">количеству попыток</link>
f5cc9f2aef9a Proxy/memcached/fastcgi/scgi/uwsgi: _next_upstream_timeout,_next_upstream_tries.
Yaroslav Zhuravlev <yar@nginx.com>
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diff changeset
218 и по <link id="memcached_next_upstream_timeout">времени</link>.
f5cc9f2aef9a Proxy/memcached/fastcgi/scgi/uwsgi: _next_upstream_timeout,_next_upstream_tries.
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diff changeset
219 </para>
f5cc9f2aef9a Proxy/memcached/fastcgi/scgi/uwsgi: _next_upstream_timeout,_next_upstream_tries.
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220
f5cc9f2aef9a Proxy/memcached/fastcgi/scgi/uwsgi: _next_upstream_timeout,_next_upstream_tries.
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parents: 1289
diff changeset
221 </directive>
f5cc9f2aef9a Proxy/memcached/fastcgi/scgi/uwsgi: _next_upstream_timeout,_next_upstream_tries.
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222
f5cc9f2aef9a Proxy/memcached/fastcgi/scgi/uwsgi: _next_upstream_timeout,_next_upstream_tries.
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diff changeset
223
f5cc9f2aef9a Proxy/memcached/fastcgi/scgi/uwsgi: _next_upstream_timeout,_next_upstream_tries.
Yaroslav Zhuravlev <yar@nginx.com>
parents: 1289
diff changeset
224 <directive name="memcached_next_upstream_timeout">
f5cc9f2aef9a Proxy/memcached/fastcgi/scgi/uwsgi: _next_upstream_timeout,_next_upstream_tries.
Yaroslav Zhuravlev <yar@nginx.com>
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diff changeset
225 <syntax><value>время</value></syntax>
f5cc9f2aef9a Proxy/memcached/fastcgi/scgi/uwsgi: _next_upstream_timeout,_next_upstream_tries.
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diff changeset
226 <default>0</default>
f5cc9f2aef9a Proxy/memcached/fastcgi/scgi/uwsgi: _next_upstream_timeout,_next_upstream_tries.
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diff changeset
227 <context>http</context>
f5cc9f2aef9a Proxy/memcached/fastcgi/scgi/uwsgi: _next_upstream_timeout,_next_upstream_tries.
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diff changeset
228 <context>server</context>
f5cc9f2aef9a Proxy/memcached/fastcgi/scgi/uwsgi: _next_upstream_timeout,_next_upstream_tries.
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diff changeset
229 <context>location</context>
f5cc9f2aef9a Proxy/memcached/fastcgi/scgi/uwsgi: _next_upstream_timeout,_next_upstream_tries.
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diff changeset
230 <appeared-in>1.7.5</appeared-in>
f5cc9f2aef9a Proxy/memcached/fastcgi/scgi/uwsgi: _next_upstream_timeout,_next_upstream_tries.
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231
f5cc9f2aef9a Proxy/memcached/fastcgi/scgi/uwsgi: _next_upstream_timeout,_next_upstream_tries.
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diff changeset
232 <para>
f5cc9f2aef9a Proxy/memcached/fastcgi/scgi/uwsgi: _next_upstream_timeout,_next_upstream_tries.
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diff changeset
233 Ограничивает время, в течение которого возможна передача запроса
f5cc9f2aef9a Proxy/memcached/fastcgi/scgi/uwsgi: _next_upstream_timeout,_next_upstream_tries.
Yaroslav Zhuravlev <yar@nginx.com>
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diff changeset
234 <link id="memcached_next_upstream">следующему серверу</link>.
f5cc9f2aef9a Proxy/memcached/fastcgi/scgi/uwsgi: _next_upstream_timeout,_next_upstream_tries.
Yaroslav Zhuravlev <yar@nginx.com>
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235 Значение <literal>0</literal> отключает это ограничение.
f5cc9f2aef9a Proxy/memcached/fastcgi/scgi/uwsgi: _next_upstream_timeout,_next_upstream_tries.
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diff changeset
236 </para>
f5cc9f2aef9a Proxy/memcached/fastcgi/scgi/uwsgi: _next_upstream_timeout,_next_upstream_tries.
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237
f5cc9f2aef9a Proxy/memcached/fastcgi/scgi/uwsgi: _next_upstream_timeout,_next_upstream_tries.
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diff changeset
238 </directive>
f5cc9f2aef9a Proxy/memcached/fastcgi/scgi/uwsgi: _next_upstream_timeout,_next_upstream_tries.
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diff changeset
239
f5cc9f2aef9a Proxy/memcached/fastcgi/scgi/uwsgi: _next_upstream_timeout,_next_upstream_tries.
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diff changeset
240
f5cc9f2aef9a Proxy/memcached/fastcgi/scgi/uwsgi: _next_upstream_timeout,_next_upstream_tries.
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parents: 1289
diff changeset
241 <directive name="memcached_next_upstream_tries">
f5cc9f2aef9a Proxy/memcached/fastcgi/scgi/uwsgi: _next_upstream_timeout,_next_upstream_tries.
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diff changeset
242 <syntax><value>число</value></syntax>
f5cc9f2aef9a Proxy/memcached/fastcgi/scgi/uwsgi: _next_upstream_timeout,_next_upstream_tries.
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243 <default>0</default>
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244 <context>http</context>
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245 <context>server</context>
f5cc9f2aef9a Proxy/memcached/fastcgi/scgi/uwsgi: _next_upstream_timeout,_next_upstream_tries.
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246 <context>location</context>
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247 <appeared-in>1.7.5</appeared-in>
f5cc9f2aef9a Proxy/memcached/fastcgi/scgi/uwsgi: _next_upstream_timeout,_next_upstream_tries.
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248
f5cc9f2aef9a Proxy/memcached/fastcgi/scgi/uwsgi: _next_upstream_timeout,_next_upstream_tries.
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249 <para>
f5cc9f2aef9a Proxy/memcached/fastcgi/scgi/uwsgi: _next_upstream_timeout,_next_upstream_tries.
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250 Ограничивает число допустимых попыток для передачи запроса
f5cc9f2aef9a Proxy/memcached/fastcgi/scgi/uwsgi: _next_upstream_timeout,_next_upstream_tries.
Yaroslav Zhuravlev <yar@nginx.com>
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diff changeset
251 <link id="memcached_next_upstream">следующему серверу</link>.
f5cc9f2aef9a Proxy/memcached/fastcgi/scgi/uwsgi: _next_upstream_timeout,_next_upstream_tries.
Yaroslav Zhuravlev <yar@nginx.com>
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diff changeset
252 Значение <literal>0</literal> отключает это ограничение.
f5cc9f2aef9a Proxy/memcached/fastcgi/scgi/uwsgi: _next_upstream_timeout,_next_upstream_tries.
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diff changeset
253 </para>
f5cc9f2aef9a Proxy/memcached/fastcgi/scgi/uwsgi: _next_upstream_timeout,_next_upstream_tries.
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254
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255 </directive>
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256
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257
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258 <directive name="memcached_pass">
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259 <syntax><value>адрес</value></syntax>
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260 <default/>
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261 <context>location</context>
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262 <context>if в location</context>
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263
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264 <para>
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265 Задаёт адрес сервера memcached.
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266 Адрес может быть указан в виде доменного имени или IP-адреса,
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267 и порта:
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268 <example>
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269 memcached_pass localhost:11211;
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270 </example>
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271 или в виде пути UNIX-сокета:
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272 <example>
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273 memcached_pass unix:/tmp/memcached.socket;
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274 </example>
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275 </para>
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276
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277 <para>
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278 Если доменному имени соответствует несколько адресов, то все они будут
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279 использоваться по очереди (round-robin).
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280 И, кроме того, адрес может быть
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281 <link doc="ngx_http_upstream_module.xml">группой серверов</link>.
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282 </para>
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283
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284 </directive>
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285
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286
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287 <directive name="memcached_read_timeout">
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288 <syntax><value>время</value></syntax>
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289 <default>60s</default>
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290 <context>http</context>
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291 <context>server</context>
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292 <context>location</context>
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293
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294 <para>
361
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295 Задаёт таймаут при чтении ответа сервера memcached.
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296 Таймаут устанавливается не на всю передачу ответа,
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297 а только между двумя операциями чтения.
361
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298 Если по истечении этого времени сервер memcached ничего не передаст,
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299 соединение закрывается.
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300 </para>
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301
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302 </directive>
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303
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304
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305 <directive name="memcached_send_timeout">
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306 <syntax><value>время</value></syntax>
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307 <default>60s</default>
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308 <context>http</context>
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309 <context>server</context>
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310 <context>location</context>
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311
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312 <para>
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313 Задаёт таймаут при передаче запроса серверу memcached.
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314 Таймаут устанавливается не на всю передачу запроса,
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315 а только между двумя операциями записи.
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316 Если по истечении этого времени сервер memcached не примет новых данных,
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317 соединение закрывается.
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318 </para>
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319
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320 </directive>
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321
2254
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322
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323 <directive name="memcached_socket_keepalive">
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324 <syntax><literal>on</literal> | <literal>off</literal></syntax>
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325 <default>off</default>
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326 <context>http</context>
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327 <context>server</context>
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328 <context>location</context>
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329 <appeared-in>1.15.6</appeared-in>
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330
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331 <para>
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332 Конфигурирует поведение “TCP keepalive”
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333 для исходящих соединений к серверу memcached.
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334 По умолчанию для сокета действуют настройки операционной системы.
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335 Если указано значение “<literal>on</literal>”, то
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336 для сокета включается параметр <c-def>SO_KEEPALIVE</c-def>.
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337 </para>
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338
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339 </directive>
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340
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341 </section>
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342
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343
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344 <section id="variables" name="Встроенные переменные">
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345
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346 <para>
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347 <list type="tag">
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348
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349 <tag-name id="var_memcached_key"><var>$memcached_key</var></tag-name>
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350 <tag-desc>
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351 Задаёт ключ для получения ответа из сервера memcached.
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352 </tag-desc>
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353
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354 </list>
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355 </para>
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356
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357 </section>
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358
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359 </module>