Mercurial > hg > nginx-site

annotate xml/ru/docs/stream/ngx_stream_upstream_hc_module.xml @ 3011:55d49eb065ac

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Fixed example in the js_periodic directive.
author Yaroslav Zhuravlev <yar@nginx.com>
date Thu, 14 Sep 2023 16:38:00 +0100
parents 9dd8c203a54a
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 <?xml version="1.0"?>
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2
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3 <!--
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4 Copyright (C) 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_stream_upstream_hc_module"
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10 link="/ru/docs/stream/ngx_stream_upstream_hc_module.html"
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11 lang="ru"
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12 rev="6">
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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_stream_upstream_hc_module</literal> (1.9.0)
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18 позволяет активировать периодические проверки работоспособности серверов в
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19 <link doc="ngx_stream_upstream_module.xml" id="upstream">группе</link>.
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20 Группа должна находиться в
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21 <link doc="ngx_stream_upstream_module.xml" id="zone">зоне разделяемой памяти</link>.
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22 </para>
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23
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24 <para>
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25 Если проверка работоспособности была неуспешной,
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26 то сервер признаётся неработоспособным.
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27 Если для группы задано несколько проверок,
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28 то при любой неуспешной проверке соответствующий сервер будет
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29 считаться неработоспособным.
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30 На неработоспособные серверы и серверы в состоянии “checking”
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31 клиентские соединения передаваться не будут.
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32 </para>
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33
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34 <para>
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35 <note>
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36 Модуль доступен как часть
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37 <commercial_version>коммерческой подписки</commercial_version>.
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38 </note>
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39 </para>
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40
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41 </section>
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42
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43
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44 <section id="example" name="Пример конфигурации">
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45
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46 <para>
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47 <example>
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48 upstream tcp {
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49 zone upstream_tcp 64k;
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50
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51 server backend1.example.com:12345 weight=5;
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52 server backend2.example.com:12345 fail_timeout=5s slow_start=30s;
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53 server 192.0.2.1:12345 max_fails=3;
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54
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55 server backup1.example.com:12345 backup;
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56 server backup2.example.com:12345 backup;
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57 }
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58
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59 server {
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60 listen 12346;
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61 proxy_pass tcp;
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62 health_check;
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63 }
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64 </example>
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65 Для каждого сервера группы <literal>tcp</literal>
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66 с интервалом в 5 секунд проверяется возможность установки TCP-соединения.
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67 Если соединение с сервером не может быть установлено,
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68 проверка считается неуспешной и сервер
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69 признаётся неработоспособным.
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70 </para>
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71
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72 <para>
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73 Проверки работоспособности можно настроить для протокола UDP:
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74 <example>
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75 upstream dns_upstream {
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76
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77 zone dns_zone 64k;
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78
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79 server dns1.example.com:53;
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80 server dns2.example.com:53;
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81 server dns3.example.com:53;
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82 }
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83
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84 server {
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85 listen 53 udp;
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86 proxy_pass dns_upstream;
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87 health_check udp;
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88 }
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89 </example>
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90 В этом случае проверяется отсутствие
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91 сообщения ICMP “<literal>Destination Unreachable</literal>”
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92 в ответ на отправленную строку “<literal>nginx health check</literal>”.
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93 </para>
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94
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95 <para>
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96 Проверки работоспособности могут тестировать данные, полученные от сервера.
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97 Тесты настраиваются отдельно при помощи директивы <link id="match"/>
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98 и указываются в параметре <literal>match</literal> директивы
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99 <link id="health_check"/>.
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100 </para>
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101
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102 </section>
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103
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104
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105 <section id="directives" name="Директивы">
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106
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107 <directive name="health_check">
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108 <syntax>[<value>параметры</value>]</syntax>
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109 <default/>
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110 <context>server</context>
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111
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112 <para>
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113 Активирует периодические проверки работоспособности серверов в
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114 <link doc="ngx_stream_upstream_hc_module.xml" id="upstream">группе</link>.
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115 </para>
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116
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117 <para>
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118 Могут быть заданы следующие необязательные параметры:
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119 <list type="tag">
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120
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121 <tag-name id="health_check_interval">
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122 <literal>interval</literal>=<value>время</value>
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123 </tag-name>
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124 <tag-desc>
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125 задаёт интервал между двумя последовательными проверками,
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126 по умолчанию 5 секунд.
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127 </tag-desc>
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128
1866
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parents: 1817
diff changeset
129 <tag-name id="health_check_jitter">
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130 <literal>jitter</literal>=<value>время</value>
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diff changeset
131 </tag-name>
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diff changeset
132 <tag-desc>
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133 задаёт время, в пределах которого
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parents: 1817
diff changeset
134 случайным образом задерживается каждая проверка,
1891
6225d50b3cba Replaced semicolon with dot in health_check.
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parents: 1866
diff changeset
135 по умолчанию задержки нет.
1866
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parents: 1817
diff changeset
136 </tag-desc>
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parents: 1817
diff changeset
137
1949
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diff changeset
138 <tag-name id="health_check_fails">
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139 <literal>fails</literal>=<value>число</value>
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140 </tag-name>
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141 <tag-desc>
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142 задаёт число последовательных неуспешных проверок для определённого сервера,
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parents: 1727
diff changeset
143 после которых сервер будет считаться неработоспособным,
1891
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parents: 1866
diff changeset
144 по умолчанию 1.
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parents: 1410
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145 </tag-desc>
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146
1949
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diff changeset
147 <tag-name id="health_check_passes">
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148 <literal>passes</literal>=<value>число</value>
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149 </tag-name>
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150 <tag-desc>
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diff changeset
151 задаёт число последовательных успешных проверок для определённого сервера,
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parents: 1727
diff changeset
152 после которых сервер будет считаться работоспособным,
1891
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parents: 1866
diff changeset
153 по умолчанию 1.
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parents: 1410
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154 </tag-desc>
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155
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diff changeset
156 <tag-name id="health_check_mandatory">
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diff changeset
157 <literal>mandatory</literal> [<literal>persistent</literal>]
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158 </tag-name>
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diff changeset
159 <tag-desc>
2768
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diff changeset
160 <para>
1925
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diff changeset
161 устанавливает исходное состояние “checking” для сервера
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parents: 1891
diff changeset
162 до завершения первой проверки работоспособности (1.11.7).
1950
ef22a80a2696 Described the "checking" state in "health_check mandatory"
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parents: 1949
diff changeset
163 На серверы в состоянии “checking” клиентские соединения передаваться не будут.
1925
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diff changeset
164 Если параметр не указан,
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diff changeset
165 то исходно сервер будет считаться работоспособным.
2768
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166 </para>
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167
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Yaroslav Zhuravlev <yar@nginx.com>
parents: 1951
diff changeset
168 <para id="health_check_persistent">
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parents: 1951
diff changeset
169 Параметр <literal>persistent</literal> (1.21.1)
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diff changeset
170 устанавливает исходное состояние “up” для сервера после перезагрузки nginx
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parents: 1951
diff changeset
171 в случае, если до перезагрузки сервер считался работоспособным.
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diff changeset
172 </para>
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173 </tag-desc>
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parents: 1891
diff changeset
174
1949
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parents: 1948
diff changeset
175 <tag-name id="health_check_match">
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diff changeset
176 <literal>match</literal>=<value>имя</value>
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177 </tag-name>
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diff changeset
178 <tag-desc>
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parents: 1727
diff changeset
179 указывает на блок <literal>match</literal> с условиями, которым должно
1891
6225d50b3cba Replaced semicolon with dot in health_check.
Yaroslav Zhuravlev <yar@nginx.com>
parents: 1866
diff changeset
180 удовлетворять соединение, чтобы результат проверки считался успешным.
1925
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parents: 1891
diff changeset
181 По умолчанию для TCP проверяется
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parents: 1891
diff changeset
182 лишь возможность установки TCP-соединения с сервером,
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parents: 1891
diff changeset
183 для <link id="health_check_udp">UDP</link> проверяется отсутствие
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parents: 1891
diff changeset
184 сообщения ICMP “<literal>Destination Unreachable</literal>”
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parents: 1891
diff changeset
185 в ответ на отправленную строку “<literal>nginx health check</literal>”.
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parents: 1891
diff changeset
186 <note>
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diff changeset
187 До версии 1.11.7 по умолчанию для UDP
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diff changeset
188 требовалось наличие блока <link id="hc_match">match</link> с параметрами
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parents: 1891
diff changeset
189 <link id="match_send">send</link> и <link id="match_expect">expect</link>.
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diff changeset
190 </note>
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diff changeset
191 </tag-desc>
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diff changeset
192
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parents: 1581
diff changeset
193 <tag-name id="health_check_port">
1728
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diff changeset
194 <literal>port</literal>=<value>число</value>
1636
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diff changeset
195 </tag-name>
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diff changeset
196 <tag-desc>
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diff changeset
197 задаёт порт, используемый при подключении к серверу
1891
6225d50b3cba Replaced semicolon with dot in health_check.
Yaroslav Zhuravlev <yar@nginx.com>
parents: 1866
diff changeset
198 для проверки его работоспособности (1.9.7).
1947
6b6d0e844bf7 Moved "health_check" and "match" to ngx_stream_upstream_hc_module.
Yaroslav Zhuravlev <yar@nginx.com>
parents: 1925
diff changeset
199 По умолчанию совпадает с портом
6b6d0e844bf7 Moved "health_check" and "match" to ngx_stream_upstream_hc_module.
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parents: 1925
diff changeset
200 <link doc="ngx_stream_upstream_module.xml" id="server">сервера</link>.
1680
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diff changeset
201 </tag-desc>
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parents: 1654
diff changeset
202
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Ruslan Ermilov <ru@nginx.com>
parents: 1654
diff changeset
203 <tag-name id="health_check_udp">
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diff changeset
204 <literal>udp</literal>
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parents: 1654
diff changeset
205 </tag-name>
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parents: 1654
diff changeset
206 <tag-desc>
1728
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parents: 1727
diff changeset
207 указывает, что для проверки работоспособности будет использоваться протокол
f93a5aadad2c Translated the stream upstream module into Russian.
Yaroslav Zhuravlev <yar@nginx.com>
parents: 1727
diff changeset
208 <literal>UDP</literal>
1925
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diff changeset
209 вместо протокола <literal>TCP</literal>, используемого по умолчанию (1.9.13).
1450
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diff changeset
210 </tag-desc>
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diff changeset
211
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Ruslan Ermilov <ru@nginx.com>
parents: 1410
diff changeset
212 </list>
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diff changeset
213 </para>
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diff changeset
214
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Ruslan Ermilov <ru@nginx.com>
parents: 1410
diff changeset
215 </directive>
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diff changeset
216
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Ruslan Ermilov <ru@nginx.com>
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diff changeset
217
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Ruslan Ermilov <ru@nginx.com>
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diff changeset
218 <directive name="health_check_timeout">
1728
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diff changeset
219 <syntax><value>время</value></syntax>
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diff changeset
220 <default>5s</default>
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diff changeset
221 <context>stream</context>
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Ruslan Ermilov <ru@nginx.com>
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diff changeset
222 <context>server</context>
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diff changeset
223
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diff changeset
224 <para>
1728
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diff changeset
225 Переопределяет значение
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diff changeset
226 <link doc="ngx_stream_proxy_module.xml" id="proxy_timeout"/>
1728
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parents: 1727
diff changeset
227 для проверок работоспособности.
1450
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diff changeset
228 </para>
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diff changeset
229
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Ruslan Ermilov <ru@nginx.com>
parents: 1410
diff changeset
230 </directive>
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diff changeset
231
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diff changeset
232
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parents: 1410
diff changeset
233 <directive name="match">
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diff changeset
234 <syntax block="yes"><value>имя</value> </syntax>
1450
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diff changeset
235 <default/>
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diff changeset
236 <context>stream</context>
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diff changeset
237
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diff changeset
238 <para>
1728
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diff changeset
239 Задаёт именованный набор тестов для для анализа ответов сервера
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parents: 1727
diff changeset
240 на запросы проверки работоспособности.
1450
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diff changeset
241 </para>
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diff changeset
242
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diff changeset
243 <para>
1728
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diff changeset
244 Могут быть заданы следующие параметры:
1450
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245 <list type="tag">
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diff changeset
246
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diff changeset
247 <tag-name id="match_send">
1728
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diff changeset
248 <literal>send</literal> <value>строка</value>;
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249 </tag-name>
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250 <tag-desc>
1728
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diff changeset
251 отправляет <value>строку</value> на сервер;
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252 </tag-desc>
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253
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254 <tag-name id="match_expect">
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255 <literal>expect</literal> <value>стока</value> |
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256 <literal>~</literal> <value>regex</value>;
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257 </tag-name>
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258 <tag-desc>
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259 текстовая строка (1.9.12) или регулярное выражение,
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260 которым должны соответствовать данные, полученные с сервера.
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261 Регулярное выражение задаётся либо с модификатором
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262 “<literal>~*</literal>” (для поиска совпадения без учёта регистра символов),
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263 либо с модификатором “<literal>~</literal>” (с учётом регистра).
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264 </tag-desc>
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265
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266 </list>
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267 Параметры <literal>send</literal> и <literal>expect</literal>
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268 могут содержать строки в шестнадцатеричном виде
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269 с префиксом “<literal>\x</literal>”
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270 и последующими двумя шестнадцатеричными цифрами,
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271 например “<literal>\x80</literal>” (1.9.12).
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272 </para>
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273
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274 <para>
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275 Проверка работоспособности считается успешной, если
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276 <list type="bullet">
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277 <listitem>
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278 TCP-соединение успешно установлено;
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279 </listitem>
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280
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281 <listitem>
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282 <value>строка</value> из параметра <literal>send</literal>
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283 была отправлена (если была задана);
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284 </listitem>
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285
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286 <listitem>
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287 данные, полученные от сервера, совпали со строкой или регулярным выражением
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288 из параметра <literal>expect</literal> (если был задан);
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289 </listitem>
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290
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291 <listitem>
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292 истёкшее время не превышает значение, указанное
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293 в директиве <link id="health_check_timeout"/>.
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294 </listitem>
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295
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296 </list>
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297 </para>
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298
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299 <para>
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300 Пример:
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301 <example>
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302 upstream backend {
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303 zone upstream_backend 10m;
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304 server 127.0.0.1:12345;
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305 }
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306
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307 match http {
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308 send "GET / HTTP/1.0\r\nHost: localhost\r\n\r\n";
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309 expect ~ "200 OK";
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310 }
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311
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312 server {
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313 listen 12346;
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314 proxy_pass backend;
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315 health_check match=http;
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316 }
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317 </example>
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318 </para>
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319
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320 <para>
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321 <note>
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322 Проверяются лишь первые байты данных
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323 <link doc="ngx_stream_proxy_module.xml" id="proxy_buffer_size"/>,
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324 полученные от сервера.
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325 </note>
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326 </para>
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327
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328 </directive>
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329
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330 </section>
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331
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332 </module>