Mercurial > hg > nginx-site
annotate xml/ru/docs/http/ngx_http_upstream_module.xml @ 566:f8148fc88224
Documented 1.2.2 changes.
author | Ruslan Ermilov <ru@nginx.com> |
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date | Tue, 03 Jul 2012 11:26:09 +0000 |
parents | a9e6a8613534 |
children | be54c443235a |
rev | line source |
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222
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1 <?xml version="1.0"?> |
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2 |
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3 <!DOCTYPE module SYSTEM "../../../../dtd/module.dtd"> |
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4 |
292 | 5 <module name="Модуль ngx_http_upstream_module" |
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Renamed ngx_http_upstream to ngx_http_upstream_module.
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6 link="/ru/docs/http/ngx_http_upstream_module.html" |
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7 lang="ru"> |
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8 |
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9 <section id="summary"> |
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10 |
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11 <para> |
292 | 12 Модуль <literal>ngx_http_upstream_module</literal> |
13 позволяет описывать группы серверов, | |
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14 которые могут использоваться в директивах |
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15 <link doc="ngx_http_proxy_module.xml" id="proxy_pass"/>, |
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16 <link doc="ngx_http_fastcgi_module.xml" id="fastcgi_pass"/> и |
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17 <link doc="ngx_http_memcached_module.xml" id="memcached_pass"/>. |
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18 </para> |
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19 |
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20 </section> |
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21 |
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22 |
292 | 23 <section id="example" name="Пример конфигурации"> |
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24 |
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25 <para> |
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26 <example> |
292 | 27 upstream <emphasis>backend</emphasis> { |
28 server backend1.example.com weight=5; | |
29 server backend2.example.com:8080; | |
30 server unix:/tmp/backend3; | |
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31 |
292 | 32 server backup1.example.com:8080 backup; |
33 server backup2.example.com:8080 backup; | |
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34 } |
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35 |
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36 server { |
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37 location / { |
292 | 38 proxy_pass http://<emphasis>backend</emphasis>; |
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39 } |
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40 } |
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41 </example> |
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42 </para> |
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43 |
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44 </section> |
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45 |
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46 |
292 | 47 <section id="directives" name="Директивы"> |
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48 |
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49 <directive name="upstream"> |
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50 <syntax block="yes"><value>название</value></syntax> |
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51 <default/> |
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52 <context>http</context> |
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53 |
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54 <para> |
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55 Описывает группу серверов. |
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56 Серверы могут слушать на разных портах. |
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57 Кроме того, можно одновременно использовать серверы, |
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58 слушающие на TCP- и UNIX-сокетах. |
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59 </para> |
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60 |
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61 <para> |
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62 Пример: |
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63 <example> |
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64 upstream backend { |
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65 server backend1.example.com weight=5; |
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66 server 127.0.0.1:8080 max_fails=3 fail_timeout=30s; |
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67 server unix:/tmp/backend3; |
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68 } |
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69 </example> |
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70 </para> |
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71 |
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72 <para> |
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73 По умолчанию запросы распределяются по серверам циклически |
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74 (в режиме round-robin) с учётом весов серверов. |
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75 В вышеприведённом примере каждые 7 запросов будут распределены так: |
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76 5 запросов на <literal>backend1.example.com</literal> |
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77 и по одному запросу на второй и третий серверы. |
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78 Если при попытке работы с сервером произошла ошибка, то запрос будет |
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79 передан следующему серверу, и так до тех пор, пока не будут опробованы |
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80 все работающие серверы. |
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81 Если не удастся получить успешный ответ |
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82 ни от одного из серверов, то клиенту будет возвращён результат работы |
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83 с последним сервером. |
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84 </para> |
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85 |
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86 </directive> |
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87 |
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88 |
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89 <directive name="server"> |
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90 <syntax><value>адрес</value> [<value>параметры</value>]</syntax> |
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91 <default/> |
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92 <context>upstream</context> |
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93 |
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94 <para> |
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95 Задаёт <value>адрес</value> и другие <value>параметры</value> |
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96 сервера. |
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97 Адрес может быть указан в виде доменного имени или IP-адреса, |
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98 и необязательного порта, или в виде пути UNIX-сокета, который |
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99 указывается после префикса “<literal>unix:</literal>”. |
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100 Если порт не указан, используется порт 80. |
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101 Доменное имя, которому соответствует несколько IP-адресов, |
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102 задаёт сразу несколько серверов. |
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103 </para> |
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104 |
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105 <para> |
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106 Могут быть заданы следующие параметры: |
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107 <list type="tag"> |
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108 |
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109 <tag-name><literal>weight</literal>=<value>число</value></tag-name> |
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110 <tag-desc> |
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111 задаёт вес сервера, по умолчанию 1. |
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112 </tag-desc> |
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113 |
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114 <tag-name><literal>max_fails</literal>=<value>число</value></tag-name> |
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115 <tag-desc> |
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116 задаёт число неудачных попыток работы с сервером |
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117 в течение времени, заданного параметром <literal>fail_timeout</literal>, |
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118 после которого он считается неработающим, также в течение времени |
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119 заданного параметром <literal>fail_timeout</literal>. |
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120 По умолчанию число попыток устанавливается равным 1. |
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121 Нулевое значение запрещает учёт попыток. |
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122 Что считается неудачной попыткой, задаётся директивами |
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123 <link doc="ngx_http_proxy_module.xml" id="proxy_next_upstream"/>, |
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124 <link doc="ngx_http_fastcgi_module.xml" id="fastcgi_next_upstream"/> и |
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125 <link doc="ngx_http_memcached_module.xml" id="memcached_next_upstream"/>. |
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126 Состояние <literal>http_404</literal> |
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127 не считается неудачной попыткой. |
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128 </tag-desc> |
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129 |
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130 <tag-name><literal>fail_timeout</literal>=<value>время</value></tag-name> |
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131 <tag-desc> |
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132 задаёт |
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133 <list type="bullet"> |
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134 |
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135 <listitem> |
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136 время, в течение которого должно произойти заданное число неудачных |
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137 попыток работы с сервером для того, чтобы сервер считался неработающим; |
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138 </listitem> |
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139 |
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140 <listitem> |
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141 и время, в течение которого сервер будет считаться неработающим. |
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142 </listitem> |
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143 |
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144 </list> |
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145 По умолчанию таймаут равен 10 секундам. |
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146 </tag-desc> |
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147 |
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148 <tag-name><literal>backup</literal></tag-name> |
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149 <tag-desc> |
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150 помечает сервер как запасной сервер. |
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151 На него будут передаваться запросы в случае, если не работают основные серверы. |
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152 </tag-desc> |
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153 |
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154 <tag-name><literal>down</literal></tag-name> |
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155 <tag-desc> |
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156 помечает сервер как постоянно неработающий; используется |
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157 совместно с директивой <link id="ip_hash"/>. |
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158 </tag-desc> |
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159 |
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160 </list> |
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161 </para> |
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162 |
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163 <para> |
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164 Пример: |
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165 <example> |
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166 upstream backend { |
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167 server backend1.example.com weight=5; |
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168 server 127.0.0.1:8080 max_fails=3 fail_timeout=30s; |
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169 server unix:/tmp/backend3; |
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170 |
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171 server backup1.example.com:8080 backup; |
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172 } |
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173 </example> |
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174 </para> |
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175 |
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176 </directive> |
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177 |
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178 |
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179 <directive name="ip_hash"> |
102
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180 <syntax/> |
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181 <default/> |
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182 <context>upstream</context> |
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183 |
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184 <para> |
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185 Задаёт для группы метод балансировки нагрузки, при котором запросы |
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186 распределяются по серверам на основе IP-адресов клиентов. |
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187 В качестве ключа для хэширования используются первые три |
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188 октета IPv4-адреса клиента или IPv6-адрес клиента целиком. |
292 | 189 Метод гарантирует, что запросы одного и того же клиента |
190 будут всегда передаваться на один и тот же сервер. | |
191 Если же этот сервер будет считаться неработающим, | |
192 то запросы этого клиента будут передаваться на другой сервер. | |
193 С большой долей вероятности это также будет один и тот же сервер. | |
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194 <note> |
566 | 195 IPv6-адреса поддерживаются начиная с версий 1.3.2 и 1.2.2. |
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196 </note> |
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197 </para> |
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198 |
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199 <para> |
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200 Если один из серверов нужно убрать на некоторое время, то для сохранения |
292 | 201 текущего хэширования IP-адресов клиентов этот сервер нужно пометить |
202 параметром <literal>down</literal>. | |
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203 </para> |
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204 |
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205 <para> |
292 | 206 Пример: |
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207 <example> |
292 | 208 upstream backend { |
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209 ip_hash; |
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210 |
292 | 211 server backend1.example.com; |
212 server backend2.example.com; | |
213 server backend3.example.com <emphasis>down</emphasis>; | |
214 server backend4.example.com; | |
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215 } |
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216 </example> |
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217 </para> |
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218 |
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219 <para> |
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220 <note> |
566 | 221 До версий 1.3.1 и 1.2.2 для серверов, использующих метод балансировки нагрузки |
526
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222 <literal>ip_hash</literal>, нельзя было задать вес. |
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223 </note> |
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224 </para> |
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225 |
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226 </directive> |
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227 |
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228 |
316
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229 <directive name="keepalive"> |
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230 <syntax><value>соединения</value></syntax> |
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231 <default/> |
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232 <context>upstream</context> |
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233 <appeared-in>1.1.4</appeared-in> |
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234 |
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235 <para> |
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236 Задействует кэш соединений для группы серверов. |
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237 </para> |
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238 |
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239 <para> |
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240 Параметр <value>соединения</value> устанавливает максимальное число |
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241 постоянных соединений с серверами группы, которые будут сохраняться |
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242 в кэше каждого рабочего процесса. |
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243 При превышении указанного числа неактивных постоянных соединений |
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244 с серверами группы самые старые соединения закрываются. |
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245 <note> |
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246 Следует отметить, что директива <literal>keepalive</literal> |
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247 не ограничивает общее число соединений, которые рабочие процессы |
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248 nginx могут открыть с серверами группы. |
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249 Новые соединения всегда создаются по мере необходимости. |
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250 Параметр <value>соединения</value> следует устанавливать |
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251 достаточно консервативно для обеспечения возможности |
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252 обработки серверами группы новых входящих соединений. |
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253 </note> |
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254 </para> |
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255 |
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256 <para> |
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257 Пример конфигурации группы серверов memcached с постоянными соединениями: |
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258 <example> |
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259 upstream memcached_backend { |
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260 server 127.0.0.1:11211; |
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261 server 10.0.0.2:11211; |
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262 |
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263 keepalive 32; |
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264 } |
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265 |
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266 server { |
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267 ... |
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268 |
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269 location /memcached/ { |
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270 set $memcached_key $uri; |
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271 memcached_pass memcached_backend; |
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272 } |
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273 |
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274 } |
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275 </example> |
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276 </para> |
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277 |
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278 <para> |
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279 Для HTTP директиву |
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280 <link doc="ngx_http_proxy_module.xml" id="proxy_http_version"/> |
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281 следует установить в “<literal>1.1</literal>”, |
367
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282 а поле заголовка <header>Connection</header> — очистить: |
316
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283 <example> |
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284 upstream http_backend { |
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285 server 127.0.0.1:8080; |
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286 |
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287 keepalive 16; |
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288 } |
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289 |
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290 server { |
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291 ... |
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292 |
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293 location /http/ { |
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294 proxy_pass http://http_backend; |
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295 proxy_http_version 1.1; |
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296 proxy_set_header Connection ""; |
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297 ... |
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298 } |
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299 } |
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300 </example> |
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301 </para> |
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302 |
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303 <para> |
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304 <note> |
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305 Хоть это и не рекомендуется, но также возможно использование постоянных |
325
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306 соединений в HTTP/1.0, путём передачи поля заголовка |
316
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307 <header>Connection: Keep-Alive</header> серверу группы. |
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308 </note> |
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309 </para> |
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310 |
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311 <para> |
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312 Для работы постоянных соединений с FastCGI-серверами потребуется |
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313 включить директиву |
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314 <link doc="ngx_http_fastcgi_module.xml" id="fastcgi_keep_conn"/>: |
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315 <example> |
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316 upstream fastcgi_backend { |
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317 server 127.0.0.1:9000; |
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318 |
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319 keepalive 8; |
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320 } |
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321 |
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322 server { |
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323 ... |
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324 |
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325 location /fastcgi/ { |
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326 fastcgi_pass fastcgi_backend; |
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327 fastcgi_keep_conn on; |
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328 ... |
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329 } |
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330 } |
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331 </example> |
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332 </para> |
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333 |
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334 <para> |
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335 <note> |
533
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336 При использовании методов балансировки нагрузки, отличных |
316
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337 от стандартного round-robin, следует активировать их до |
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338 директивы <literal>keepalive</literal>. |
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339 </note> |
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340 |
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341 <note> |
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342 Протоколы SCGI и uwsgi не определяют семантику постоянных соединений. |
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343 </note> |
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344 </para> |
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345 |
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346 </directive> |
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347 |
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348 |
526
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349 <directive name="least_conn"> |
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350 <syntax/> |
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351 <default/> |
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352 <context>upstream</context> |
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353 <appeared-in>1.3.1</appeared-in> |
566 | 354 <appeared-in>1.2.2</appeared-in> |
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355 |
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356 <para> |
533
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357 Задаёт для группы метод балансировки нагрузки, при котором запрос |
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358 передаётся серверу с наименьшим числом активных соединений, |
526
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359 с учётом весов серверов. |
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360 Если подходит сразу несколько серверов, они выбираются циклически |
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361 (в режиме round-robin) с учётом их весов. |
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362 </para> |
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363 |
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364 </directive> |
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365 |
76
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366 </section> |
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367 |
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368 |
292 | 369 <section id="variables" name="Встроенные переменные"> |
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370 |
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371 <para> |
292 | 372 Модуль <literal>ngx_http_upstream_module</literal> |
373 поддерживает следующие встроенные переменные: | |
374 <list type="tag"> | |
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375 |
292 | 376 <tag-name><var>$upstream_addr</var></tag-name> |
377 <tag-desc> | |
378 хранит IP-адрес и порт сервера или путь к UNIX-сокету. | |
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379 Если при обработке запроса были сделаны обращения к нескольким серверам, |
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380 то их адреса разделяются запятой, например, |
292 | 381 “<literal>192.168.1.1:80, 192.168.1.2:80, unix:/tmp/sock</literal>”. |
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382 Если произошло внутреннее перенаправление от одной группы серверов на другую |
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383 с помощью |
292 | 384 <header>X-Accel-Redirect</header> или |
385 <link doc="ngx_http_core_module.xml" id="error_page"/>, | |
386 то эти группы серверов разделяются двоеточием, например, | |
387 “<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>”. | |
388 </tag-desc> | |
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389 |
292 | 390 <tag-name><var>$upstream_response_time</var></tag-name> |
391 <tag-desc> | |
392 хранит времена ответов серверов в секундах с точностью до миллисекунд. | |
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393 Несколько ответов также разделяются запятыми и двоеточиями. |
292 | 394 </tag-desc> |
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395 |
292 | 396 <tag-name><var>$upstream_status</var></tag-name> |
397 <tag-desc> | |
398 хранит коды ответов серверов. | |
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399 Несколько ответов также разделяются запятыми и двоеточиями. |
292 | 400 </tag-desc> |
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401 |
292 | 402 <tag-name><var>$upstream_http_...</var></tag-name> |
403 <tag-desc> | |
404 хранят поля заголовка ответа сервера. | |
405 Например, поле заголовка ответа <header>Server</header> | |
406 доступно в переменной <var>$upstream_http_server</var>. | |
407 Необходимо иметь в виду, что запоминаются только поля заголовка ответа | |
408 последнего сервера. | |
409 </tag-desc> | |
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410 |
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411 </list> |
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412 </para> |
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413 |
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414 </section> |
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415 |
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416 </module> |