Mercurial > hg > nginx-site
annotate xml/ru/docs/http/ngx_http_upstream_module.xml @ 1126:2e28d1c4a0a2
Upstream: revised layout of the "server" directive.
author | Ruslan Ermilov <ru@nginx.com> |
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date | Fri, 21 Mar 2014 10:55:50 +0400 |
parents | 9a95b9026a16 |
children | 948c853f5d22 |
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222
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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 |
292 | 10 <module name="Модуль ngx_http_upstream_module" |
135
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Renamed ngx_http_upstream to ngx_http_upstream_module.
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11 link="/ru/docs/http/ngx_http_upstream_module.html" |
589 | 12 lang="ru" |
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13 rev="5"> |
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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> |
292 | 18 Модуль <literal>ngx_http_upstream_module</literal> |
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 |
292 | 29 <section id="example" name="Пример конфигурации"> |
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30 |
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31 <para> |
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32 <example> |
292 | 33 upstream <emphasis>backend</emphasis> { |
34 server backend1.example.com weight=5; | |
35 server backend2.example.com:8080; | |
36 server unix:/tmp/backend3; | |
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37 |
292 | 38 server backup1.example.com:8080 backup; |
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 / { |
292 | 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 |
292 | 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 server backup1.example.com backup; |
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76 } |
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77 </example> |
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78 </para> |
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79 |
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80 <para> |
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81 По умолчанию запросы распределяются по серверам циклически |
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82 (в режиме round-robin) с учётом весов серверов. |
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83 В вышеприведённом примере каждые 7 запросов будут распределены так: |
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84 5 запросов на <literal>backend1.example.com</literal> |
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85 и по одному запросу на второй и третий серверы. |
966 | 86 Если при попытке работы с сервером происходит ошибка, то запрос |
87 передаётся следующему серверу, и так далее до тех пор, пока не будут опробованы | |
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88 все работающие серверы. |
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89 Если не удастся получить успешный ответ |
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90 ни от одного из серверов, то клиенту будет возвращён результат работы |
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91 с последним сервером. |
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92 </para> |
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93 |
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94 </directive> |
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95 |
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96 |
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97 <directive name="server"> |
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98 <syntax><value>адрес</value> [<value>параметры</value>]</syntax> |
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99 <default/> |
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100 <context>upstream</context> |
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101 |
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102 <para> |
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103 Задаёт <value>адрес</value> и другие <value>параметры</value> |
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104 сервера. |
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105 Адрес может быть указан в виде доменного имени или IP-адреса, |
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106 и необязательного порта, или в виде пути UNIX-сокета, который |
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107 указывается после префикса “<literal>unix:</literal>”. |
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108 Если порт не указан, используется порт 80. |
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109 Доменное имя, которому соответствует несколько IP-адресов, |
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110 задаёт сразу несколько серверов. |
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111 </para> |
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112 |
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113 <para> |
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114 Могут быть заданы следующие параметры: |
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115 <list type="tag"> |
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116 |
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117 <tag-name><literal>weight</literal>=<value>число</value></tag-name> |
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118 <tag-desc> |
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119 задаёт вес сервера, по умолчанию 1. |
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120 </tag-desc> |
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121 |
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122 <tag-name><literal>max_fails</literal>=<value>число</value></tag-name> |
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123 <tag-desc> |
966 | 124 задаёт число неудачных попыток работы с сервером, которые должны произойти |
125 в промежуток времени, заданный параметром <literal>fail_timeout</literal>, | |
126 чтобы сервер считался неработающим на период времени, также заданный | |
127 параметром <literal>fail_timeout</literal>. | |
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128 По умолчанию число попыток устанавливается равным 1. |
966 | 129 Нулевое значение отключает учёт попыток. |
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130 Что считается неудачной попыткой, определяется директивами |
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131 <link doc="ngx_http_proxy_module.xml" id="proxy_next_upstream"/>, |
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132 <link doc="ngx_http_fastcgi_module.xml" id="fastcgi_next_upstream"/> и |
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133 <link doc="ngx_http_memcached_module.xml" id="memcached_next_upstream"/>. |
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134 </tag-desc> |
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135 |
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136 <tag-name><literal>fail_timeout</literal>=<value>время</value></tag-name> |
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137 <tag-desc> |
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138 задаёт |
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139 <list type="bullet"> |
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140 |
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141 <listitem> |
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142 время, в течение которого должно произойти заданное число неудачных |
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143 попыток работы с сервером для того, чтобы сервер считался неработающим; |
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144 </listitem> |
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145 |
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146 <listitem> |
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147 и время, в течение которого сервер будет считаться неработающим. |
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148 </listitem> |
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149 |
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150 </list> |
966 | 151 По умолчанию параметр равен 10 секундам. |
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152 </tag-desc> |
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153 |
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154 <tag-name><literal>backup</literal></tag-name> |
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155 <tag-desc> |
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156 помечает сервер как запасной сервер. |
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157 На него будут передаваться запросы в случае, если не работают основные серверы. |
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158 </tag-desc> |
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159 |
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160 <tag-name><literal>down</literal></tag-name> |
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161 <tag-desc> |
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162 помечает сервер как постоянно неработающий; используется |
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163 совместно с директивой <link id="ip_hash"/>. |
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164 </tag-desc> |
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165 |
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166 </list> |
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167 </para> |
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168 |
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169 <para> |
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170 Кроме того, |
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171 следующие параметры доступны как часть <commercial_version/>: |
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172 <list type="tag"> |
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173 |
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174 <tag-name id="max_conns"> |
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175 <literal>max_conns</literal>=<value>число</value> |
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176 </tag-name> |
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177 <tag-desc> |
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178 ограничивает максимальное <value>число</value> одновременных соединений |
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179 к проксируемому серверу (1.5.9). |
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180 Значение по умолчанию равно 0 и означает, что ограничения нет. |
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181 </tag-desc> |
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182 |
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183 <tag-name id="resolve"> |
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184 <literal>resolve</literal> |
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185 </tag-name> |
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186 <tag-desc> |
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187 отслеживает изменения IP-адресов, соответствующих доменному имени сервера, |
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188 и автоматически изменяет конфигурацию группы |
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189 без необходимости перезапуска nginx (1.5.12) |
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190 <para> |
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191 Для работы этого параметра |
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192 директива <link doc="ngx_http_core_module.xml" id="resolver"/> |
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193 должна быть задана в блоке |
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194 <link doc="ngx_http_core_module.xml" id="http"/>. |
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195 <example> |
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196 http { |
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197 resolver 10.0.0.1; |
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198 |
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199 upstream u { |
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200 zone ...; |
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201 ... |
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202 server example.com resolve; |
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203 } |
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204 } |
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205 </example> |
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206 </para> |
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207 </tag-desc> |
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208 |
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209 </list> |
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210 </para> |
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211 |
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212 </directive> |
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213 |
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214 |
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215 <directive name="zone"> |
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216 <syntax><value>имя</value> <value>размер</value></syntax> |
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217 <default/> |
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218 <context>upstream</context> |
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219 |
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220 <para> |
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221 Задаёт <value>имя</value> и <value>размер</value> зоны разделяемой памяти, |
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222 в которой хранятся конфигурация группы и рабочее состояние, |
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223 разделяемые между рабочими процессами. |
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224 В таких группах возможно изменение состава группы или |
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225 настроек отдельных серверов без необходимости перезапуска nginx. |
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226 Конфигурация доступна через специальный location, |
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227 для которого указана директива <link id="upstream_conf"/>. |
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228 </para> |
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229 |
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230 <para> |
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231 <note> |
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232 Эта директива доступна как часть <commercial_version/>. |
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233 </note> |
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234 </para> |
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235 |
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236 </directive> |
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237 |
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238 |
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239 <directive name="ip_hash"> |
102
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240 <syntax/> |
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241 <default/> |
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242 <context>upstream</context> |
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243 |
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244 <para> |
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245 Задаёт для группы метод балансировки нагрузки, при котором запросы |
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246 распределяются по серверам на основе IP-адресов клиентов. |
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247 В качестве ключа для хэширования используются первые три |
542
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248 октета IPv4-адреса клиента или IPv6-адрес клиента целиком. |
292 | 249 Метод гарантирует, что запросы одного и того же клиента |
250 будут всегда передаваться на один и тот же сервер. | |
251 Если же этот сервер будет считаться неработающим, | |
252 то запросы этого клиента будут передаваться на другой сервер. | |
253 С большой долей вероятности это также будет один и тот же сервер. | |
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254 <note> |
566 | 255 IPv6-адреса поддерживаются начиная с версий 1.3.2 и 1.2.2. |
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256 </note> |
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257 </para> |
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258 |
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259 <para> |
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260 Если один из серверов нужно убрать на некоторое время, то для сохранения |
292 | 261 текущего хэширования IP-адресов клиентов этот сервер нужно пометить |
262 параметром <literal>down</literal>. | |
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263 </para> |
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264 |
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265 <para> |
292 | 266 Пример: |
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267 <example> |
292 | 268 upstream backend { |
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269 ip_hash; |
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270 |
292 | 271 server backend1.example.com; |
272 server backend2.example.com; | |
273 server backend3.example.com <emphasis>down</emphasis>; | |
274 server backend4.example.com; | |
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275 } |
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276 </example> |
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277 </para> |
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278 |
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279 <para> |
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280 <note> |
566 | 281 До версий 1.3.1 и 1.2.2 для серверов, использующих метод балансировки нагрузки |
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282 <literal>ip_hash</literal>, нельзя было задать вес. |
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283 </note> |
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284 </para> |
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285 |
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286 </directive> |
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287 |
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288 |
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289 <directive name="keepalive"> |
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290 <syntax><value>соединения</value></syntax> |
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291 <default/> |
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292 <context>upstream</context> |
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293 <appeared-in>1.1.4</appeared-in> |
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294 |
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295 <para> |
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296 Задействует кэш соединений для группы серверов. |
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297 </para> |
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298 |
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299 <para> |
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300 Параметр <value>соединения</value> устанавливает максимальное число |
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301 неактивных постоянных соединений с серверами группы, которые будут |
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302 сохраняться в кэше каждого рабочего процесса. |
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303 При превышении этого числа наиболее давно не используемые соединения |
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304 закрываются. |
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305 <note> |
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306 Следует особо отметить, что директива <literal>keepalive</literal> |
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307 не ограничивает общее число соединений с серверами группы, которые |
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308 рабочие процессы nginx могут открыть. |
966 | 309 Параметр <value>соединения</value> следует устанавливать достаточно |
310 консервативно, чтобы серверы группы по-прежнему могли обрабатывать | |
311 новые входящие соединения. | |
316
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312 </note> |
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313 </para> |
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314 |
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315 <para> |
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316 Пример конфигурации группы серверов memcached с постоянными соединениями: |
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317 <example> |
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318 upstream memcached_backend { |
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319 server 127.0.0.1:11211; |
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320 server 10.0.0.2:11211; |
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321 |
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322 keepalive 32; |
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323 } |
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324 |
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325 server { |
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326 ... |
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327 |
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328 location /memcached/ { |
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329 set $memcached_key $uri; |
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330 memcached_pass memcached_backend; |
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331 } |
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332 |
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333 } |
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334 </example> |
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335 </para> |
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336 |
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337 <para> |
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338 Для HTTP директиву |
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339 <link doc="ngx_http_proxy_module.xml" id="proxy_http_version"/> |
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340 следует установить в “<literal>1.1</literal>”, |
367
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341 а поле заголовка <header>Connection</header> — очистить: |
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342 <example> |
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343 upstream http_backend { |
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344 server 127.0.0.1:8080; |
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345 |
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346 keepalive 16; |
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347 } |
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348 |
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349 server { |
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350 ... |
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351 |
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352 location /http/ { |
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353 proxy_pass http://http_backend; |
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354 proxy_http_version 1.1; |
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355 proxy_set_header Connection ""; |
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356 ... |
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357 } |
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358 } |
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359 </example> |
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360 </para> |
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361 |
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362 <para> |
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363 <note> |
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364 Хоть это и не рекомендуется, но также возможно использование постоянных |
966 | 365 соединений с HTTP/1.0, путём передачи поля заголовка |
316
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366 <header>Connection: Keep-Alive</header> серверу группы. |
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367 </note> |
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368 </para> |
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369 |
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370 <para> |
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371 Для работы постоянных соединений с FastCGI-серверами потребуется |
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372 включить директиву |
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373 <link doc="ngx_http_fastcgi_module.xml" id="fastcgi_keep_conn"/>: |
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374 <example> |
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375 upstream fastcgi_backend { |
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376 server 127.0.0.1:9000; |
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377 |
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378 keepalive 8; |
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379 } |
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380 |
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381 server { |
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382 ... |
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383 |
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384 location /fastcgi/ { |
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385 fastcgi_pass fastcgi_backend; |
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386 fastcgi_keep_conn on; |
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387 ... |
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388 } |
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389 } |
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390 </example> |
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391 </para> |
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392 |
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393 <para> |
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394 <note> |
533
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395 При использовании методов балансировки нагрузки, отличных |
316
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396 от стандартного round-robin, следует активировать их до |
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397 директивы <literal>keepalive</literal>. |
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398 </note> |
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399 |
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400 <note> |
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401 Протоколы SCGI и uwsgi не определяют семантику постоянных соединений. |
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402 </note> |
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403 </para> |
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404 |
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405 </directive> |
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406 |
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407 |
1125
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408 <directive name="least_conn"> |
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409 <syntax/> |
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410 <default/> |
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411 <context>upstream</context> |
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412 <appeared-in>1.3.1</appeared-in> |
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413 <appeared-in>1.2.2</appeared-in> |
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414 |
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415 <para> |
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416 Задаёт для группы метод балансировки нагрузки, при котором запрос |
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417 передаётся серверу с наименьшим числом активных соединений, |
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418 с учётом весов серверов. |
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419 Если подходит сразу несколько серверов, они выбираются циклически |
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420 (в режиме round-robin) с учётом их весов. |
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421 </para> |
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|
422 |
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423 </directive> |
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424 |
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|
425 |
1122
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426 <directive name="queue"> |
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427 <syntax> |
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428 <value>число</value> |
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429 [<literal>timeout</literal>=<value>время</value>]</syntax> |
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430 <default/> |
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431 <context>upstream</context> |
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432 <appeared-in>1.5.12</appeared-in> |
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433 |
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|
434 <para> |
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435 Если при обработке запроса невозможно сразу выбрать сервер группы |
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436 и в группе есть серверы, у которых число соединений достигло |
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|
437 ограничения <link id="max_conns"/>, |
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438 запрос будет помещён в очередь. |
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439 Директива задаёт максимальное число запросов, которые могут одновременно |
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440 находиться в очереди. |
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441 Если очередь переполнена |
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442 или за время, задаваемое параметром <literal>timeout</literal>, |
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443 так и не удастся выбрать сервер для передачи ему запроса, |
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444 клиенту будет возвращена ошибка. |
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445 </para> |
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|
446 |
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|
447 <para> |
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448 По умолчанию параметр <literal>timeout</literal> равен 60 секундам. |
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449 </para> |
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|
450 |
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451 <para> |
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452 <note> |
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|
453 Эта директива доступна как часть <commercial_version/>. |
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454 </note> |
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|
455 </para> |
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|
456 |
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457 </directive> |
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|
458 |
76
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Russian documentation import.
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diff
changeset
|
459 </section> |
4a4caa566120
Russian documentation import.
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parents:
diff
changeset
|
460 |
4a4caa566120
Russian documentation import.
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diff
changeset
|
461 |
292 | 462 <section id="variables" name="Встроенные переменные"> |
76
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Russian documentation import.
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diff
changeset
|
463 |
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diff
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|
464 <para> |
292 | 465 Модуль <literal>ngx_http_upstream_module</literal> |
466 поддерживает следующие встроенные переменные: | |
467 <list type="tag"> | |
76
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diff
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|
468 |
292 | 469 <tag-name><var>$upstream_addr</var></tag-name> |
470 <tag-desc> | |
471 хранит IP-адрес и порт сервера или путь к UNIX-сокету. | |
76
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diff
changeset
|
472 Если при обработке запроса были сделаны обращения к нескольким серверам, |
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diff
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|
473 то их адреса разделяются запятой, например, |
292 | 474 “<literal>192.168.1.1:80, 192.168.1.2:80, unix:/tmp/sock</literal>”. |
256
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diff
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|
475 Если произошло внутреннее перенаправление от одной группы серверов на другую |
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|
476 с помощью |
292 | 477 <header>X-Accel-Redirect</header> или |
478 <link doc="ngx_http_core_module.xml" id="error_page"/>, | |
966 | 479 то адреса, соответствующие разным группам серверов, разделяются двоеточием, |
480 например, | |
292 | 481 “<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>”. |
482 </tag-desc> | |
76
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changeset
|
483 |
731
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Documented $upstream_cache_status and $upstream_response_length variables.
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diff
changeset
|
484 <tag-name><var>$upstream_cache_status</var></tag-name> |
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Documented $upstream_cache_status and $upstream_response_length variables.
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diff
changeset
|
485 <tag-desc> |
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Documented $upstream_cache_status and $upstream_response_length variables.
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diff
changeset
|
486 хранит статус доступа к кэшу ответов (0.8.3). |
1075
6c021feec587
Removed unjustified non-breakable spaces.
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1016
diff
changeset
|
487 Статус может быть одним из “<literal>MISS</literal>”, |
731
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Documented $upstream_cache_status and $upstream_response_length variables.
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diff
changeset
|
488 “<literal>BYPASS</literal>”, “<literal>EXPIRED</literal>”, |
1016
2d8269d8fea8
Translated documentation on cache revalidation into russian.
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parents:
966
diff
changeset
|
489 “<literal>STALE</literal>”, “<literal>UPDATING</literal>”, |
2d8269d8fea8
Translated documentation on cache revalidation into russian.
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diff
changeset
|
490 “<literal>REVALIDATED</literal>” или “<literal>HIT</literal>”. |
731
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|
491 </tag-desc> |
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Documented $upstream_cache_status and $upstream_response_length variables.
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|
492 |
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Documented $upstream_cache_status and $upstream_response_length variables.
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changeset
|
493 <tag-name><var>$upstream_response_length</var></tag-name> |
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Documented $upstream_cache_status and $upstream_response_length variables.
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changeset
|
494 <tag-desc> |
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495 хранит длины ответов, полученных от серверов группы (0.7.27); |
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496 длины хранятся в байтах. |
966 | 497 Длины нескольких ответов разделяются запятыми и двоеточиями |
498 подобно адресам в переменной <var>$upstream_addr</var>. | |
731
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499 </tag-desc> |
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500 |
292 | 501 <tag-name><var>$upstream_response_time</var></tag-name> |
502 <tag-desc> | |
731
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503 хранит времена ответов, полученных от серверов группы; |
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504 времена хранятся в секундах с точностью до миллисекунд. |
966 | 505 Времена нескольких ответов разделяются запятыми и двоеточиями |
506 подобно адресам в переменной <var>$upstream_addr</var>. | |
292 | 507 </tag-desc> |
76
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508 |
292 | 509 <tag-name><var>$upstream_status</var></tag-name> |
510 <tag-desc> | |
731
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511 хранит коды ответов, полученных от серверов группы. |
966 | 512 Коды нескольких ответов разделяются запятыми и двоеточиями |
513 подобно адресам в переменной <var>$upstream_addr</var>. | |
292 | 514 </tag-desc> |
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515 |
292 | 516 <tag-name><var>$upstream_http_...</var></tag-name> |
517 <tag-desc> | |
518 хранят поля заголовка ответа сервера. | |
519 Например, поле заголовка ответа <header>Server</header> | |
520 доступно в переменной <var>$upstream_http_server</var>. | |
731
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521 Правила преобразования имён полей заголовка ответа в имена переменных |
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522 такие же, как для переменных с префиксом |
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523 “<link doc="ngx_http_core_module.xml" id="variables">$http_</link>”. |
966 | 524 Необходимо иметь в виду, что запоминаются поля заголовка только из ответа |
292 | 525 последнего сервера. |
526 </tag-desc> | |
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527 |
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528 </list> |
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529 </para> |
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530 |
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531 </section> |
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532 |
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533 </module> |