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annotate xml/ru/docs/http/ngx_http_upstream_module.xml @ 942:ba3d6ade3513

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Elaborate on upstream server failures. Documented that {proxy,fastcgi,memcached}_next_upstream directives define what is considered an unsuccessful attempt of communication with a server.
author Ruslan Ermilov <ru@nginx.com>
date Fri, 05 Jul 2013 10:40:38 +0400
parents e26a18eb5ccd
children 95c3c3bbf1ce
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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_upstream_module"
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11 link="/ru/docs/http/ngx_http_upstream_module.html"
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12 lang="ru"
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13 rev="4">
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14
110
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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_upstream_module</literal>
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19 позволяет описывать группы серверов,
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20 которые могут использоваться в директивах
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21 <link doc="ngx_http_proxy_module.xml" id="proxy_pass"/>,
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22 <link doc="ngx_http_fastcgi_module.xml" id="fastcgi_pass"/> и
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23 <link doc="ngx_http_memcached_module.xml" id="memcached_pass"/>.
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24 </para>
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25
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26 </section>
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27
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28
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29 <section id="example" name="Пример конфигурации">
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30
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31 <para>
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32 <example>
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33 upstream <emphasis>backend</emphasis> {
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34 server backend1.example.com weight=5;
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35 server backend2.example.com:8080;
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36 server unix:/tmp/backend3;
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37
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38 server backup1.example.com:8080 backup;
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39 server backup2.example.com:8080 backup;
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40 }
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41
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42 server {
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43 location / {
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44 proxy_pass http://<emphasis>backend</emphasis>;
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45 }
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46 }
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47 </example>
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48 </para>
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49
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50 </section>
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51
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52
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53 <section id="directives" name="Директивы">
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54
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55 <directive name="upstream">
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56 <syntax block="yes"><value>название</value></syntax>
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57 <default/>
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58 <context>http</context>
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59
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60 <para>
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61 Описывает группу серверов.
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62 Серверы могут слушать на разных портах.
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63 Кроме того, можно одновременно использовать серверы,
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64 слушающие на TCP- и UNIX-сокетах.
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65 </para>
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66
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67 <para>
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68 Пример:
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69 <example>
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70 upstream backend {
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71 server backend1.example.com weight=5;
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72 server 127.0.0.1:8080 max_fails=3 fail_timeout=30s;
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73 server unix:/tmp/backend3;
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74 }
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75 </example>
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76 </para>
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77
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78 <para>
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79 По умолчанию запросы распределяются по серверам циклически
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80 (в режиме round-robin) с учётом весов серверов.
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81 В вышеприведённом примере каждые 7 запросов будут распределены так:
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82 5 запросов на <literal>backend1.example.com</literal>
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83 и по одному запросу на второй и третий серверы.
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84 Если при попытке работы с сервером произошла ошибка, то запрос будет
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85 передан следующему серверу, и так до тех пор, пока не будут опробованы
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86 все работающие серверы.
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87 Если не удастся получить успешный ответ
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88 ни от одного из серверов, то клиенту будет возвращён результат работы
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89 с последним сервером.
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90 </para>
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91
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92 </directive>
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93
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94
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95 <directive name="server">
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96 <syntax><value>адрес</value> [<value>параметры</value>]</syntax>
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97 <default/>
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98 <context>upstream</context>
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99
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100 <para>
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101 Задаёт <value>адрес</value> и другие <value>параметры</value>
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102 сервера.
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103 Адрес может быть указан в виде доменного имени или IP-адреса,
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104 и необязательного порта, или в виде пути UNIX-сокета, который
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105 указывается после префикса “<literal>unix:</literal>”.
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106 Если порт не указан, используется порт 80.
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107 Доменное имя, которому соответствует несколько IP-адресов,
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108 задаёт сразу несколько серверов.
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109 </para>
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110
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111 <para>
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112 Могут быть заданы следующие параметры:
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113 <list type="tag">
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114
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115 <tag-name><literal>weight</literal>=<value>число</value></tag-name>
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116 <tag-desc>
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117 задаёт вес сервера, по умолчанию 1.
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118 </tag-desc>
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119
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120 <tag-name><literal>max_fails</literal>=<value>число</value></tag-name>
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121 <tag-desc>
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122 задаёт число неудачных попыток работы с сервером
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123 в течение времени, заданного параметром <literal>fail_timeout</literal>,
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124 после которого он считается неработающим, также в течение времени
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125 заданного параметром <literal>fail_timeout</literal>.
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126 По умолчанию число попыток устанавливается равным 1.
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127 Нулевое значение запрещает учёт попыток.
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128 Что считается неудачной попыткой, определяется директивами
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129 <link doc="ngx_http_proxy_module.xml" id="proxy_next_upstream"/>,
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130 <link doc="ngx_http_fastcgi_module.xml" id="fastcgi_next_upstream"/> и
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131 <link doc="ngx_http_memcached_module.xml" id="memcached_next_upstream"/>.
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132 </tag-desc>
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133
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134 <tag-name><literal>fail_timeout</literal>=<value>время</value></tag-name>
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135 <tag-desc>
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136 задаёт
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137 <list type="bullet">
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138
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139 <listitem>
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140 время, в течение которого должно произойти заданное число неудачных
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141 попыток работы с сервером для того, чтобы сервер считался неработающим;
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142 </listitem>
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143
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144 <listitem>
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145 и время, в течение которого сервер будет считаться неработающим.
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146 </listitem>
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147
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148 </list>
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149 По умолчанию таймаут равен 10 секундам.
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150 </tag-desc>
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151
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152 <tag-name><literal>backup</literal></tag-name>
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153 <tag-desc>
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154 помечает сервер как запасной сервер.
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155 На него будут передаваться запросы в случае, если не работают основные серверы.
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156 </tag-desc>
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157
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158 <tag-name><literal>down</literal></tag-name>
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159 <tag-desc>
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160 помечает сервер как постоянно неработающий; используется
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161 совместно с директивой <link id="ip_hash"/>.
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162 </tag-desc>
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163
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164 </list>
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165 </para>
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166
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167 <para>
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168 Пример:
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169 <example>
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170 upstream backend {
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171 server backend1.example.com weight=5;
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172 server 127.0.0.1:8080 max_fails=3 fail_timeout=30s;
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173 server unix:/tmp/backend3;
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174
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175 server backup1.example.com:8080 backup;
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176 }
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177 </example>
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178 </para>
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179
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180 </directive>
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181
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182
76
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183 <directive name="ip_hash">
102
c76a257f3fd4 The directive name is now automatically printed in <default> and <syntax>.
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184 <syntax/>
99
1d315ef37215 The case <default/> is now language-agnostic.
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185 <default/>
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186 <context>upstream</context>
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187
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188 <para>
533
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189 Задаёт для группы метод балансировки нагрузки, при котором запросы
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diff changeset
190 распределяются по серверам на основе IP-адресов клиентов.
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diff changeset
191 В качестве ключа для хэширования используются первые три
542
a9e6a8613534 Documented IPv6 support in ip_hash.
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diff changeset
192 октета IPv4-адреса клиента или IPv6-адрес клиента целиком.
292
7bc830cc79bb Revision.
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193 Метод гарантирует, что запросы одного и того же клиента
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194 будут всегда передаваться на один и тот же сервер.
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195 Если же этот сервер будет считаться неработающим,
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196 то запросы этого клиента будут передаваться на другой сервер.
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197 С большой долей вероятности это также будет один и тот же сервер.
542
a9e6a8613534 Documented IPv6 support in ip_hash.
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198 <note>
566
f8148fc88224 Documented 1.2.2 changes.
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199 IPv6-адреса поддерживаются начиная с версий 1.3.2 и 1.2.2.
542
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200 </note>
76
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201 </para>
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202
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203 <para>
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204 Если один из серверов нужно убрать на некоторое время, то для сохранения
292
7bc830cc79bb Revision.
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diff changeset
205 текущего хэширования IP-адресов клиентов этот сервер нужно пометить
7bc830cc79bb Revision.
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diff changeset
206 параметром <literal>down</literal>.
76
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207 </para>
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208
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209 <para>
292
7bc830cc79bb Revision.
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210 Пример:
76
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211 <example>
292
7bc830cc79bb Revision.
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diff changeset
212 upstream backend {
76
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213 ip_hash;
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214
292
7bc830cc79bb Revision.
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215 server backend1.example.com;
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216 server backend2.example.com;
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217 server backend3.example.com <emphasis>down</emphasis>;
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218 server backend4.example.com;
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219 }
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220 </example>
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221 </para>
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222
526
4f907cde0382 1.3.1 changes: ip_hash+weight, least_conn.
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diff changeset
223 <para>
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diff changeset
224 <note>
566
f8148fc88224 Documented 1.2.2 changes.
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diff changeset
225 До версий 1.3.1 и 1.2.2 для серверов, использующих метод балансировки нагрузки
526
4f907cde0382 1.3.1 changes: ip_hash+weight, least_conn.
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diff changeset
226 <literal>ip_hash</literal>, нельзя было задать вес.
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diff changeset
227 </note>
4f907cde0382 1.3.1 changes: ip_hash+weight, least_conn.
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diff changeset
228 </para>
4f907cde0382 1.3.1 changes: ip_hash+weight, least_conn.
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diff changeset
229
76
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230 </directive>
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231
4a4caa566120 Russian documentation import.
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diff changeset
232
316
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diff changeset
233 <directive name="keepalive">
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diff changeset
234 <syntax><value>соединения</value></syntax>
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diff changeset
235 <default/>
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diff changeset
236 <context>upstream</context>
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diff changeset
237 <appeared-in>1.1.4</appeared-in>
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diff changeset
238
1fb1c077658b Documented the following directives: "keepalive", "proxy_http_version",
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diff changeset
239 <para>
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diff changeset
240 Задействует кэш соединений для группы серверов.
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diff changeset
241 </para>
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diff changeset
242
1fb1c077658b Documented the following directives: "keepalive", "proxy_http_version",
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diff changeset
243 <para>
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diff changeset
244 Параметр <value>соединения</value> устанавливает максимальное число
654
841118e33f41 Refined the text about cache of connections to upstream servers.
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diff changeset
245 неактивных постоянных соединений с серверами группы, которые будут
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parents: 589
diff changeset
246 сохраняться в кэше каждого рабочего процесса.
841118e33f41 Refined the text about cache of connections to upstream servers.
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diff changeset
247 При превышении этого числа наиболее давно не используемые соединения
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diff changeset
248 закрываются.
316
1fb1c077658b Documented the following directives: "keepalive", "proxy_http_version",
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diff changeset
249 <note>
654
841118e33f41 Refined the text about cache of connections to upstream servers.
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diff changeset
250 Следует особо отметить, что директива <literal>keepalive</literal>
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diff changeset
251 не ограничивает общее число соединений с серверами группы, которые
841118e33f41 Refined the text about cache of connections to upstream servers.
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diff changeset
252 рабочие процессы nginx могут открыть.
316
1fb1c077658b Documented the following directives: "keepalive", "proxy_http_version",
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diff changeset
253 Параметр <value>соединения</value> следует устанавливать
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diff changeset
254 достаточно консервативно для обеспечения возможности
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diff changeset
255 обработки серверами группы новых входящих соединений.
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diff changeset
256 </note>
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diff changeset
257 </para>
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diff changeset
258
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diff changeset
259 <para>
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diff changeset
260 Пример конфигурации группы серверов memcached с постоянными соединениями:
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diff changeset
261 <example>
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diff changeset
262 upstream memcached_backend {
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diff changeset
263 server 127.0.0.1:11211;
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diff changeset
264 server 10.0.0.2:11211;
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diff changeset
265
1fb1c077658b Documented the following directives: "keepalive", "proxy_http_version",
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diff changeset
266 keepalive 32;
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diff changeset
267 }
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268
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diff changeset
269 server {
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diff changeset
270 ...
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diff changeset
271
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diff changeset
272 location /memcached/ {
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diff changeset
273 set $memcached_key $uri;
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diff changeset
274 memcached_pass memcached_backend;
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diff changeset
275 }
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diff changeset
276
1fb1c077658b Documented the following directives: "keepalive", "proxy_http_version",
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diff changeset
277 }
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278 </example>
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diff changeset
279 </para>
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diff changeset
280
1fb1c077658b Documented the following directives: "keepalive", "proxy_http_version",
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diff changeset
281 <para>
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diff changeset
282 Для HTTP директиву
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283 <link doc="ngx_http_proxy_module.xml" id="proxy_http_version"/>
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diff changeset
284 следует установить в “<literal>1.1</literal>”,
367
f4033b9bc4ec - Removed unnecessary instances of unbreakable space.
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diff changeset
285 а поле заголовка <header>Connection</header> — очистить:
316
1fb1c077658b Documented the following directives: "keepalive", "proxy_http_version",
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diff changeset
286 <example>
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diff changeset
287 upstream http_backend {
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diff changeset
288 server 127.0.0.1:8080;
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diff changeset
289
1fb1c077658b Documented the following directives: "keepalive", "proxy_http_version",
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diff changeset
290 keepalive 16;
1fb1c077658b Documented the following directives: "keepalive", "proxy_http_version",
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diff changeset
291 }
1fb1c077658b Documented the following directives: "keepalive", "proxy_http_version",
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diff changeset
292
1fb1c077658b Documented the following directives: "keepalive", "proxy_http_version",
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diff changeset
293 server {
1fb1c077658b Documented the following directives: "keepalive", "proxy_http_version",
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diff changeset
294 ...
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295
1fb1c077658b Documented the following directives: "keepalive", "proxy_http_version",
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diff changeset
296 location /http/ {
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diff changeset
297 proxy_pass http://http_backend;
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diff changeset
298 proxy_http_version 1.1;
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diff changeset
299 proxy_set_header Connection "";
1fb1c077658b Documented the following directives: "keepalive", "proxy_http_version",
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diff changeset
300 ...
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diff changeset
301 }
1fb1c077658b Documented the following directives: "keepalive", "proxy_http_version",
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diff changeset
302 }
1fb1c077658b Documented the following directives: "keepalive", "proxy_http_version",
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303 </example>
1fb1c077658b Documented the following directives: "keepalive", "proxy_http_version",
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diff changeset
304 </para>
1fb1c077658b Documented the following directives: "keepalive", "proxy_http_version",
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305
1fb1c077658b Documented the following directives: "keepalive", "proxy_http_version",
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diff changeset
306 <para>
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diff changeset
307 <note>
1fb1c077658b Documented the following directives: "keepalive", "proxy_http_version",
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diff changeset
308 Хоть это и не рекомендуется, но также возможно использование постоянных
325
da8c7db64391 Consistently translate "header field".
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diff changeset
309 соединений в HTTP/1.0, путём передачи поля заголовка
316
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diff changeset
310 <header>Connection: Keep-Alive</header> серверу группы.
1fb1c077658b Documented the following directives: "keepalive", "proxy_http_version",
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diff changeset
311 </note>
1fb1c077658b Documented the following directives: "keepalive", "proxy_http_version",
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diff changeset
312 </para>
1fb1c077658b Documented the following directives: "keepalive", "proxy_http_version",
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313
1fb1c077658b Documented the following directives: "keepalive", "proxy_http_version",
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diff changeset
314 <para>
1fb1c077658b Documented the following directives: "keepalive", "proxy_http_version",
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diff changeset
315 Для работы постоянных соединений с FastCGI-серверами потребуется
1fb1c077658b Documented the following directives: "keepalive", "proxy_http_version",
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diff changeset
316 включить директиву
1fb1c077658b Documented the following directives: "keepalive", "proxy_http_version",
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diff changeset
317 <link doc="ngx_http_fastcgi_module.xml" id="fastcgi_keep_conn"/>:
1fb1c077658b Documented the following directives: "keepalive", "proxy_http_version",
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diff changeset
318 <example>
1fb1c077658b Documented the following directives: "keepalive", "proxy_http_version",
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diff changeset
319 upstream fastcgi_backend {
1fb1c077658b Documented the following directives: "keepalive", "proxy_http_version",
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diff changeset
320 server 127.0.0.1:9000;
1fb1c077658b Documented the following directives: "keepalive", "proxy_http_version",
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diff changeset
321
1fb1c077658b Documented the following directives: "keepalive", "proxy_http_version",
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diff changeset
322 keepalive 8;
1fb1c077658b Documented the following directives: "keepalive", "proxy_http_version",
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diff changeset
323 }
1fb1c077658b Documented the following directives: "keepalive", "proxy_http_version",
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diff changeset
324
1fb1c077658b Documented the following directives: "keepalive", "proxy_http_version",
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diff changeset
325 server {
1fb1c077658b Documented the following directives: "keepalive", "proxy_http_version",
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diff changeset
326 ...
1fb1c077658b Documented the following directives: "keepalive", "proxy_http_version",
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diff changeset
327
1fb1c077658b Documented the following directives: "keepalive", "proxy_http_version",
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diff changeset
328 location /fastcgi/ {
1fb1c077658b Documented the following directives: "keepalive", "proxy_http_version",
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diff changeset
329 fastcgi_pass fastcgi_backend;
1fb1c077658b Documented the following directives: "keepalive", "proxy_http_version",
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diff changeset
330 fastcgi_keep_conn on;
1fb1c077658b Documented the following directives: "keepalive", "proxy_http_version",
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diff changeset
331 ...
1fb1c077658b Documented the following directives: "keepalive", "proxy_http_version",
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diff changeset
332 }
1fb1c077658b Documented the following directives: "keepalive", "proxy_http_version",
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diff changeset
333 }
1fb1c077658b Documented the following directives: "keepalive", "proxy_http_version",
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diff changeset
334 </example>
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diff changeset
335 </para>
1fb1c077658b Documented the following directives: "keepalive", "proxy_http_version",
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diff changeset
336
1fb1c077658b Documented the following directives: "keepalive", "proxy_http_version",
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diff changeset
337 <para>
1fb1c077658b Documented the following directives: "keepalive", "proxy_http_version",
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diff changeset
338 <note>
533
fb630c3c5039 Revamped the upstream documentation somewhat.
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diff changeset
339 При использовании методов балансировки нагрузки, отличных
316
1fb1c077658b Documented the following directives: "keepalive", "proxy_http_version",
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diff changeset
340 от стандартного round-robin, следует активировать их до
1fb1c077658b Documented the following directives: "keepalive", "proxy_http_version",
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parents: 292
diff changeset
341 директивы <literal>keepalive</literal>.
1fb1c077658b Documented the following directives: "keepalive", "proxy_http_version",
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diff changeset
342 </note>
1fb1c077658b Documented the following directives: "keepalive", "proxy_http_version",
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diff changeset
343
1fb1c077658b Documented the following directives: "keepalive", "proxy_http_version",
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diff changeset
344 <note>
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diff changeset
345 Протоколы SCGI и uwsgi не определяют семантику постоянных соединений.
1fb1c077658b Documented the following directives: "keepalive", "proxy_http_version",
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diff changeset
346 </note>
1fb1c077658b Documented the following directives: "keepalive", "proxy_http_version",
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diff changeset
347 </para>
1fb1c077658b Documented the following directives: "keepalive", "proxy_http_version",
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diff changeset
348
1fb1c077658b Documented the following directives: "keepalive", "proxy_http_version",
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diff changeset
349 </directive>
1fb1c077658b Documented the following directives: "keepalive", "proxy_http_version",
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diff changeset
350
1fb1c077658b Documented the following directives: "keepalive", "proxy_http_version",
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diff changeset
351
526
4f907cde0382 1.3.1 changes: ip_hash+weight, least_conn.
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diff changeset
352 <directive name="least_conn">
4f907cde0382 1.3.1 changes: ip_hash+weight, least_conn.
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diff changeset
353 <syntax/>
4f907cde0382 1.3.1 changes: ip_hash+weight, least_conn.
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diff changeset
354 <default/>
4f907cde0382 1.3.1 changes: ip_hash+weight, least_conn.
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diff changeset
355 <context>upstream</context>
4f907cde0382 1.3.1 changes: ip_hash+weight, least_conn.
Ruslan Ermilov <ru@nginx.com>
parents: 367
diff changeset
356 <appeared-in>1.3.1</appeared-in>
566
f8148fc88224 Documented 1.2.2 changes.
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parents: 542
diff changeset
357 <appeared-in>1.2.2</appeared-in>
526
4f907cde0382 1.3.1 changes: ip_hash+weight, least_conn.
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parents: 367
diff changeset
358
4f907cde0382 1.3.1 changes: ip_hash+weight, least_conn.
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parents: 367
diff changeset
359 <para>
533
fb630c3c5039 Revamped the upstream documentation somewhat.
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diff changeset
360 Задаёт для группы метод балансировки нагрузки, при котором запрос
fb630c3c5039 Revamped the upstream documentation somewhat.
Ruslan Ermilov <ru@nginx.com>
parents: 526
diff changeset
361 передаётся серверу с наименьшим числом активных соединений,
526
4f907cde0382 1.3.1 changes: ip_hash+weight, least_conn.
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parents: 367
diff changeset
362 с учётом весов серверов.
4f907cde0382 1.3.1 changes: ip_hash+weight, least_conn.
Ruslan Ermilov <ru@nginx.com>
parents: 367
diff changeset
363 Если подходит сразу несколько серверов, они выбираются циклически
4f907cde0382 1.3.1 changes: ip_hash+weight, least_conn.
Ruslan Ermilov <ru@nginx.com>
parents: 367
diff changeset
364 (в режиме round-robin) с учётом их весов.
4f907cde0382 1.3.1 changes: ip_hash+weight, least_conn.
Ruslan Ermilov <ru@nginx.com>
parents: 367
diff changeset
365 </para>
4f907cde0382 1.3.1 changes: ip_hash+weight, least_conn.
Ruslan Ermilov <ru@nginx.com>
parents: 367
diff changeset
366
4f907cde0382 1.3.1 changes: ip_hash+weight, least_conn.
Ruslan Ermilov <ru@nginx.com>
parents: 367
diff changeset
367 </directive>
4f907cde0382 1.3.1 changes: ip_hash+weight, least_conn.
Ruslan Ermilov <ru@nginx.com>
parents: 367
diff changeset
368
76
4a4caa566120 Russian documentation import.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
369 </section>
4a4caa566120 Russian documentation import.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
370
4a4caa566120 Russian documentation import.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
371
292
7bc830cc79bb Revision.
Ruslan Ermilov <ru@nginx.com>
parents: 280
diff changeset
372 <section id="variables" name="Встроенные переменные">
76
4a4caa566120 Russian documentation import.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
373
4a4caa566120 Russian documentation import.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
374 <para>
292
7bc830cc79bb Revision.
Ruslan Ermilov <ru@nginx.com>
parents: 280
diff changeset
375 Модуль <literal>ngx_http_upstream_module</literal>
7bc830cc79bb Revision.
Ruslan Ermilov <ru@nginx.com>
parents: 280
diff changeset
376 поддерживает следующие встроенные переменные:
7bc830cc79bb Revision.
Ruslan Ermilov <ru@nginx.com>
parents: 280
diff changeset
377 <list type="tag">
76
4a4caa566120 Russian documentation import.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
378
292
7bc830cc79bb Revision.
Ruslan Ermilov <ru@nginx.com>
parents: 280
diff changeset
379 <tag-name><var>$upstream_addr</var></tag-name>
7bc830cc79bb Revision.
Ruslan Ermilov <ru@nginx.com>
parents: 280
diff changeset
380 <tag-desc>
7bc830cc79bb Revision.
Ruslan Ermilov <ru@nginx.com>
parents: 280
diff changeset
381 хранит IP-адрес и порт сервера или путь к UNIX-сокету.
76
4a4caa566120 Russian documentation import.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
382 Если при обработке запроса были сделаны обращения к нескольким серверам,
4a4caa566120 Russian documentation import.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
383 то их адреса разделяются запятой, например,
292
7bc830cc79bb Revision.
Ruslan Ermilov <ru@nginx.com>
parents: 280
diff changeset
384 “<literal>192.168.1.1:80, 192.168.1.2:80, unix:/tmp/sock</literal>”.
256
c78b2d6fe261 Use another term for "redirect".
Ruslan Ermilov <ru@nginx.com>
parents: 222
diff changeset
385 Если произошло внутреннее перенаправление от одной группы серверов на другую
c78b2d6fe261 Use another term for "redirect".
Ruslan Ermilov <ru@nginx.com>
parents: 222
diff changeset
386 с помощью
292
7bc830cc79bb Revision.
Ruslan Ermilov <ru@nginx.com>
parents: 280
diff changeset
387 <header>X-Accel-Redirect</header> или
7bc830cc79bb Revision.
Ruslan Ermilov <ru@nginx.com>
parents: 280
diff changeset
388 <link doc="ngx_http_core_module.xml" id="error_page"/>,
7bc830cc79bb Revision.
Ruslan Ermilov <ru@nginx.com>
parents: 280
diff changeset
389 то эти группы серверов разделяются двоеточием, например,
7bc830cc79bb Revision.
Ruslan Ermilov <ru@nginx.com>
parents: 280
diff changeset
390 “<literal>192.168.1.1:80, 192.168.1.2:80, unix:/tmp/sock : 192.168.10.1:80, 192.168.10.2:80</literal>”.
7bc830cc79bb Revision.
Ruslan Ermilov <ru@nginx.com>
parents: 280
diff changeset
391 </tag-desc>
76
4a4caa566120 Russian documentation import.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
392
731
f62328124e5b Documented $upstream_cache_status and $upstream_response_length variables.
Vladimir Homutov <vl@nginx.com>
parents: 654
diff changeset
393 <tag-name><var>$upstream_cache_status</var></tag-name>
f62328124e5b Documented $upstream_cache_status and $upstream_response_length variables.
Vladimir Homutov <vl@nginx.com>
parents: 654
diff changeset
394 <tag-desc>
f62328124e5b Documented $upstream_cache_status and $upstream_response_length variables.
Vladimir Homutov <vl@nginx.com>
parents: 654
diff changeset
395 хранит статус доступа к кэшу ответов (0.8.3).
f62328124e5b Documented $upstream_cache_status and $upstream_response_length variables.
Vladimir Homutov <vl@nginx.com>
parents: 654
diff changeset
396 Статус может быть одним из “<literal>MISS</literal>”, 
f62328124e5b Documented $upstream_cache_status and $upstream_response_length variables.
Vladimir Homutov <vl@nginx.com>
parents: 654
diff changeset
397 “<literal>BYPASS</literal>”, “<literal>EXPIRED</literal>”,
f62328124e5b Documented $upstream_cache_status and $upstream_response_length variables.
Vladimir Homutov <vl@nginx.com>
parents: 654
diff changeset
398 “<literal>STALE</literal>”, “<literal>UPDATING</literal>” или
f62328124e5b Documented $upstream_cache_status and $upstream_response_length variables.
Vladimir Homutov <vl@nginx.com>
parents: 654
diff changeset
399 “<literal>HIT</literal>”.
f62328124e5b Documented $upstream_cache_status and $upstream_response_length variables.
Vladimir Homutov <vl@nginx.com>
parents: 654
diff changeset
400 </tag-desc>
f62328124e5b Documented $upstream_cache_status and $upstream_response_length variables.
Vladimir Homutov <vl@nginx.com>
parents: 654
diff changeset
401
f62328124e5b Documented $upstream_cache_status and $upstream_response_length variables.
Vladimir Homutov <vl@nginx.com>
parents: 654
diff changeset
402 <tag-name><var>$upstream_response_length</var></tag-name>
f62328124e5b Documented $upstream_cache_status and $upstream_response_length variables.
Vladimir Homutov <vl@nginx.com>
parents: 654
diff changeset
403 <tag-desc>
f62328124e5b Documented $upstream_cache_status and $upstream_response_length variables.
Vladimir Homutov <vl@nginx.com>
parents: 654
diff changeset
404 хранит длины ответов, полученных от серверов группы (0.7.27);
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Vladimir Homutov <vl@nginx.com>
parents: 654
diff changeset
405 длины хранятся в байтах.
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Vladimir Homutov <vl@nginx.com>
parents: 654
diff changeset
406 Несколько ответов разделяются запятыми и двоеточиями,
f62328124e5b Documented $upstream_cache_status and $upstream_response_length variables.
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parents: 654
diff changeset
407 подобно переменной <var>$upstream_addr</var>.
f62328124e5b Documented $upstream_cache_status and $upstream_response_length variables.
Vladimir Homutov <vl@nginx.com>
parents: 654
diff changeset
408 </tag-desc>
f62328124e5b Documented $upstream_cache_status and $upstream_response_length variables.
Vladimir Homutov <vl@nginx.com>
parents: 654
diff changeset
409
292
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Ruslan Ermilov <ru@nginx.com>
parents: 280
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410 <tag-name><var>$upstream_response_time</var></tag-name>
7bc830cc79bb Revision.
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parents: 280
diff changeset
411 <tag-desc>
731
f62328124e5b Documented $upstream_cache_status and $upstream_response_length variables.
Vladimir Homutov <vl@nginx.com>
parents: 654
diff changeset
412 хранит времена ответов, полученных от серверов группы;
f62328124e5b Documented $upstream_cache_status and $upstream_response_length variables.
Vladimir Homutov <vl@nginx.com>
parents: 654
diff changeset
413 времена хранятся в секундах с точностью до миллисекунд.
f62328124e5b Documented $upstream_cache_status and $upstream_response_length variables.
Vladimir Homutov <vl@nginx.com>
parents: 654
diff changeset
414 Несколько ответов разделяются запятыми и двоеточиями,
f62328124e5b Documented $upstream_cache_status and $upstream_response_length variables.
Vladimir Homutov <vl@nginx.com>
parents: 654
diff changeset
415 подобно переменной <var>$upstream_addr</var>.
292
7bc830cc79bb Revision.
Ruslan Ermilov <ru@nginx.com>
parents: 280
diff changeset
416 </tag-desc>
76
4a4caa566120 Russian documentation import.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
417
292
7bc830cc79bb Revision.
Ruslan Ermilov <ru@nginx.com>
parents: 280
diff changeset
418 <tag-name><var>$upstream_status</var></tag-name>
7bc830cc79bb Revision.
Ruslan Ermilov <ru@nginx.com>
parents: 280
diff changeset
419 <tag-desc>
731
f62328124e5b Documented $upstream_cache_status and $upstream_response_length variables.
Vladimir Homutov <vl@nginx.com>
parents: 654
diff changeset
420 хранит коды ответов, полученных от серверов группы.
f62328124e5b Documented $upstream_cache_status and $upstream_response_length variables.
Vladimir Homutov <vl@nginx.com>
parents: 654
diff changeset
421 Несколько ответов разделяются запятыми и двоеточиями,
f62328124e5b Documented $upstream_cache_status and $upstream_response_length variables.
Vladimir Homutov <vl@nginx.com>
parents: 654
diff changeset
422 подобно переменной <var>$upstream_addr</var>.
292
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Ruslan Ermilov <ru@nginx.com>
parents: 280
diff changeset
423 </tag-desc>
76
4a4caa566120 Russian documentation import.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
424
292
7bc830cc79bb Revision.
Ruslan Ermilov <ru@nginx.com>
parents: 280
diff changeset
425 <tag-name><var>$upstream_http_...</var></tag-name>
7bc830cc79bb Revision.
Ruslan Ermilov <ru@nginx.com>
parents: 280
diff changeset
426 <tag-desc>
7bc830cc79bb Revision.
Ruslan Ermilov <ru@nginx.com>
parents: 280
diff changeset
427 хранят поля заголовка ответа сервера.
7bc830cc79bb Revision.
Ruslan Ermilov <ru@nginx.com>
parents: 280
diff changeset
428 Например, поле заголовка ответа <header>Server</header>
7bc830cc79bb Revision.
Ruslan Ermilov <ru@nginx.com>
parents: 280
diff changeset
429 доступно в переменной <var>$upstream_http_server</var>.
731
f62328124e5b Documented $upstream_cache_status and $upstream_response_length variables.
Vladimir Homutov <vl@nginx.com>
parents: 654
diff changeset
430 Правила преобразования имён полей заголовка ответа в имена переменных
f62328124e5b Documented $upstream_cache_status and $upstream_response_length variables.
Vladimir Homutov <vl@nginx.com>
parents: 654
diff changeset
431 такие же, как для переменных с префиксом
f62328124e5b Documented $upstream_cache_status and $upstream_response_length variables.
Vladimir Homutov <vl@nginx.com>
parents: 654
diff changeset
432 “<link doc="ngx_http_core_module.xml" id="variables">$http_</link>”.
292
7bc830cc79bb Revision.
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parents: 280
diff changeset
433 Необходимо иметь в виду, что запоминаются только поля заголовка ответа
7bc830cc79bb Revision.
Ruslan Ermilov <ru@nginx.com>
parents: 280
diff changeset
434 последнего сервера.
7bc830cc79bb Revision.
Ruslan Ermilov <ru@nginx.com>
parents: 280
diff changeset
435 </tag-desc>
76
4a4caa566120 Russian documentation import.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
436
4a4caa566120 Russian documentation import.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
437 </list>
4a4caa566120 Russian documentation import.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
438 </para>
4a4caa566120 Russian documentation import.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
439
4a4caa566120 Russian documentation import.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
440 </section>
4a4caa566120 Russian documentation import.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
441
4a4caa566120 Russian documentation import.
Maxim Dounin <mdounin@mdounin.ru>
parents:
diff changeset
442 </module>