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annotate xml/ru/docs/http/ngx_http_upstream_hc_module.xml @ 1945:88477c5d2751

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Moved "health_check" and "match" to ngx_http_upstream_hc_module.
author Yaroslav Zhuravlev <yar@nginx.com>
date Thu, 30 Mar 2017 21:26:44 +0300
parents xml/ru/docs/http/ngx_http_upstream_module.xml@a58b35cc0823
children 37df1535ea91
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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) Nginx, Inc.
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5 -->
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6
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7 <!DOCTYPE module SYSTEM "../../../../dtd/module.dtd">
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8
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9 <module name="Модуль ngx_http_upstream_hc_module"
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10 link="/ru/docs/http/ngx_http_upstream_hc_module.html"
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11 lang="ru"
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12 rev="1">
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13
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14 <section id="summary">
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15
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16 <para>
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17 Модуль <literal>ngx_http_upstream_hc_module</literal>
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18 позволяет активировать периодические проверки работоспособности серверов в
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19 <link doc="ngx_http_upstream_module.xml" id="upstream">группе</link>,
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20 указанной в содержащем location.
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21 </para>
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22
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23 <para>
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24 <note>
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25 Модуль доступен как часть
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26 <commercial_version>коммерческой подписки</commercial_version>.
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27 </note>
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28 </para>
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29
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30 </section>
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31
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32
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33 <section id="example" name="Пример конфигурации">
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34
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35 <para>
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36 <example>
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37 upstream dynamic {
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38 zone upstream_dynamic 64k;
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39
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40 server backend1.example.com weight=5;
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41 server backend2.example.com:8080 fail_timeout=5s slow_start=30s;
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42 server 192.0.2.1 max_fails=3;
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43
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44 server backup1.example.com:8080 backup;
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45 server backup2.example.com:8080 backup;
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46 }
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47
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48 server {
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49 location / {
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50 proxy_pass http://dynamic;
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51 health_check;
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52 }
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53 }
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54 </example>
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55 </para>
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56
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57 </section>
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58
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59
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60 <section id="directives" name="Директивы">
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61
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62 <directive name="health_check">
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63 <syntax>[<value>параметры</value>]</syntax>
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64 <default/>
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65 <context>location</context>
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66
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67 <para>
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68 Активирует периодические проверки работоспособности серверов в
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69 <link doc="ngx_http_upstream_module.xml" id="upstream">группе</link>,
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70 указанной в содержащем location.
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71 </para>
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72
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73 <para>
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74 Могут быть заданы следующие необязательные параметры:
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75 <list type="tag">
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76
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77 <tag-name id="interval">
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78 <literal>interval</literal>=<value>время</value>
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79 </tag-name>
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80 <tag-desc>
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81 задаёт интервал между двумя последовательными проверками,
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82 по умолчанию 5 секунд.
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83 </tag-desc>
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84
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85 <tag-name id="health_check_jitter">
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86 <literal>jitter</literal>=<value>время</value>
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87 </tag-name>
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88 <tag-desc>
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89 задаёт время, в пределах которого
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90 случайным образом задерживается каждая проверка,
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91 по умолчанию задержки нет.
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92 </tag-desc>
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93
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94 <tag-name id="fails">
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95 <literal>fails</literal>=<value>число</value>
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96 </tag-name>
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97 <tag-desc>
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98 задаёт число последовательных неуспешных проверок для определённого сервера,
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99 после которых сервер будет считаться неработоспособным,
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100 по умолчанию 1.
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101 </tag-desc>
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102
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103 <tag-name id="passes">
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104 <literal>passes</literal>=<value>число</value>
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105 </tag-name>
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106 <tag-desc>
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107 задаёт число последовательных успешных проверок для определённого сервера,
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108 после которых сервер будет считаться работоспособным,
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109 по умолчанию 1.
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110 </tag-desc>
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111
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112 <tag-name id="uri">
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113 <literal>uri</literal>=<value>uri</value>
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114 </tag-name>
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115 <tag-desc>
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116 задаёт URI, используемый в запросах, проверяющих работоспособность,
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117 по умолчанию “<literal>/</literal>”.
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118 </tag-desc>
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119
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120 <tag-name id="health_check_mandatory">
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121 <literal>mandatory</literal>
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122 </tag-name>
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123 <tag-desc>
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124 устанавливает исходное состояние “checking” для сервера
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125 до завершения первой проверки работоспособности (1.11.7).
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126 Если параметр не указан,
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127 то исходно сервер будет считаться работоспособным.
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128 </tag-desc>
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129
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130 <tag-name id="hc_match">
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131 <literal>match</literal>=<value>имя</value>
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132 </tag-name>
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133 <tag-desc>
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134 указывает на блок <literal>match</literal> с условиями, которым должен
1891
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135 удовлетворять ответ, чтобы результат проверки считался успешным.
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136 По умолчанию код ответа должен быть 2xx или 3xx.
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137 </tag-desc>
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138
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139 <tag-name id="health_check_port">
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140 <literal>port</literal>=<value>число</value>
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141 </tag-name>
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142 <tag-desc>
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143 задаёт порт, используемый при подключении к серверу
1891
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144 для проверки его работоспособности (1.9.7).
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145 По умолчанию совпадает с портом
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146 <link doc="ngx_http_upstream_module.xml" id="server">сервера</link>.
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147 </tag-desc>
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148
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149 </list>
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150 </para>
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151
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152 <para>
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153 В примере
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154 <example>
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155 location / {
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156 proxy_pass http://backend;
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157 health_check;
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158 }
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159 </example>
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160 каждому серверу группы <literal>backend</literal>
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161 с интервалом в 5 секунд посылаются запросы “<literal>/</literal>”.
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162 Если происходит ошибка или таймаут при работе с сервером, или
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163 код ответа проксируемого сервера не равен
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164 2xx или 3xx, проверка считается неуспешной и сервер
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165 признаётся неработоспособным.
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166 На неработоспособные серверы и серверы в состоянии “checking”
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167 клиентские запросы передаваться не будут.
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168 </para>
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169
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170 <para>
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171 Проверки работоспособности могут тестировать код ответа,
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172 наличие или отсутствие определённых полей заголовка и их значений,
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173 а также содержимое тела ответа.
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174 Тесты настраиваются отдельно при помощи директивы <link id="match"/>
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175 и указываются в параметре <literal>match</literal>.
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176 Например:
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177 <example>
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178 http {
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179 server {
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180 ...
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181 location / {
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182 proxy_pass http://backend;
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183 health_check match=welcome;
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184 }
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185 }
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186
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187 match welcome {
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188 status 200;
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189 header Content-Type = text/html;
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190 body ~ "Welcome to nginx!";
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191 }
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192 }
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193 </example>
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194 В такой конфигурации успешный ответ на проверочный запрос
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195 должен иметь код 200, тип содержимого “<literal>text/html</literal>”
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196 и “<literal>Welcome to nginx!</literal>” в теле ответа.
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197 </para>
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198
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199 <para>
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200 Группа должна находиться в
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201 <link doc="ngx_http_upstream_module.xml" id="zone">зоне разделяемой памяти</link>.
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202 </para>
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203
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204 <para>
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205 Если для группы задано несколько проверок,
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206 то при любой неуспешной проверке соответствующий сервер будет
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207 считаться неработоспособным.
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208 </para>
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209
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210 <para>
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211 <note>
1348
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212 Обратите внимание, что при использовании проверок
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213 большинство переменных имеют пустые значения.
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214 </note>
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215 </para>
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216
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217 </directive>
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218
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219
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220 <directive name="match">
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221 <syntax block="yes"><value>имя</value></syntax>
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222 <default/>
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223 <context>http</context>
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224
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225 <para>
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226 Задаёт именованный набор тестов для анализа ответов
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227 на запросы проверки работоспособности.
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228 </para>
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229
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230 <para>
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231 В ответе могут быть протестированы следующие объекты:
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232 <list type="tag">
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233
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234 <tag-name><literal>status 200;</literal></tag-name>
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235 <tag-desc>код ответа равен 200</tag-desc>
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236
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237 <tag-name><literal>status ! 500;</literal></tag-name>
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238 <tag-desc>код ответа не равен 500</tag-desc>
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239
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240 <tag-name><literal>status 200 204;</literal></tag-name>
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241 <tag-desc>код ответа равен 200 или 204</tag-desc>
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242
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243 <tag-name><literal>status ! 301 302;</literal></tag-name>
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244 <tag-desc>код ответа не равен ни 301, ни 302</tag-desc>
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245
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246 <tag-name><literal>status 200-399;</literal></tag-name>
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247 <tag-desc>код ответа находится в диапазоне от 200 до 399</tag-desc>
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248
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249 <tag-name><literal>status ! 400-599;</literal></tag-name>
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250 <tag-desc>код ответа находится вне диапазона от 400 до 599</tag-desc>
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251
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252 <tag-name><literal>status 301-303 307;</literal></tag-name>
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253 <tag-desc>код ответа равен 301, 302, 303 или 307</tag-desc>
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254
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255 </list>
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256
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257 <list type="tag">
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258
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259 <tag-name><literal>header Content-Type = text/html;</literal></tag-name>
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260 <tag-desc>
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261 заголовок содержит <header>Content-Type</header>
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262 со значением <literal>text/html</literal>
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263 </tag-desc>
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264
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265 <tag-name><literal>header Content-Type != text/html;</literal></tag-name>
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266 <tag-desc>
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267 заголовок содержит <header>Content-Type</header>
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268 со значением, отличным от <literal>text/html</literal>
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269 </tag-desc>
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270
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271 <tag-name><literal>header Connection ~ close;</literal></tag-name>
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272 <tag-desc>
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273 заголовок содержит <header>Connection</header>
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274 со значением, совпадающим с регулярным выражением <literal>close</literal>
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275 </tag-desc>
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276
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277 <tag-name><literal>header Connection !~ close;</literal></tag-name>
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278 <tag-desc>
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279 заголовок содержит <header>Connection</header>
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280 со значением, не совпадающим с регулярным выражением <literal>close</literal>
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281 </tag-desc>
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282
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283 <tag-name><literal>header Host;</literal></tag-name>
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284 <tag-desc>заголовок содержит <header>Host</header></tag-desc>
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285
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286 <tag-name><literal>header ! X-Accel-Redirect;</literal></tag-name>
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287 <tag-desc>заголовок не содержит <header>X-Accel-Redirect</header></tag-desc>
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288
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289 </list>
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290
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291 <list type="tag">
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292
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293 <tag-name><literal>body ~ "Welcome to nginx!";</literal></tag-name>
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294 <tag-desc>
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295 тело ответа совпадает с регулярным выражением
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296 “<literal>Welcome to nginx!</literal>”
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297 </tag-desc>
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298
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299 <tag-name><literal>body !~ "Welcome to nginx!";</literal></tag-name>
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300 <tag-desc>
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301 тело ответа не совпадает с регулярным выражением
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302 “<literal>Welcome to nginx!</literal>”
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303 </tag-desc>
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304
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305 </list>
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306 </para>
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307
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308 <para>
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309 Если задано несколько тестов,
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310 то ответ должен удовлетворять всем тестам.
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311 <note>
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312 Проверяются только первые 256 Кбайт тела ответа.
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313 </note>
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314 </para>
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315
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316 <para>
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317 Примеры:
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318 <example>
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319 # код ответа 200, тип содержимого "text/html"
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320 # и тело ответа содержит "Welcome to nginx!"
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321 match welcome {
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322 status 200;
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323 header Content-Type = text/html;
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324 body ~ "Welcome to nginx!";
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325 }
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326 </example>
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327
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328 <example>
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329 # код ответа не равен 301, 302, 303 и 307 и заголовок не содержит "Refresh:"
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330 match not_redirect {
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331 status ! 301-303 307;
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332 header ! Refresh;
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333 }
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334 </example>
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335
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336 <example>
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337 # код ответа успешный и сервер не в сервисном режиме
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338 match server_ok {
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339 status 200-399;
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340 body !~ "maintenance mode";
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341 }
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342 </example>
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343
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344 </para>
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345
1237
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346 </directive>
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347
76
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348 </section>
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349
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350 </module>