Mercurial > hg > nginx-site
annotate xml/en/docs/stream/ngx_stream_upstream_hc_module.xml @ 1949:8f9c685dfabd
Updated IDs in "health_check" directives.
author | Yaroslav Zhuravlev <yar@nginx.com> |
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date | Thu, 30 Mar 2017 21:26:44 +0300 |
parents | 25962922969a |
children | ef22a80a2696 |
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="Module ngx_stream_upstream_hc_module" |
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10 link="/en/docs/stream/ngx_stream_upstream_hc_module.html" |
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11 lang="en" |
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12 rev="3"> |
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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 The <literal>ngx_stream_upstream_hc_module</literal> module (1.9.0) |
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18 allows enabling periodic health checks of the servers in a |
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19 <link doc="ngx_stream_upstream_module.xml" id="upstream">group</link>. |
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20 The server group must reside in the |
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21 <link doc="ngx_stream_upstream_module.xml" id="zone">shared memory</link>. |
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22 </para> |
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23 |
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24 <para> |
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25 If a health check fails, the server will be considered unhealthy. |
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26 If several health checks are defined for the same group of servers, |
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27 a single failure of any check will make the corresponding server be |
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28 considered unhealthy. |
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29 Client connections are not passed to unhealthy servers |
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30 and servers in the “checking” state. |
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31 </para> |
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32 |
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33 <para> |
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34 <note> |
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35 This module is available as part of our |
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36 <commercial_version>commercial subscription</commercial_version>. |
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37 </note> |
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38 </para> |
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39 |
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40 </section> |
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41 |
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42 |
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43 <section id="example" name="Example Configuration"> |
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44 |
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45 <para> |
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46 <example> |
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47 upstream tcp { |
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48 zone upstream_tcp 64k; |
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49 |
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50 server backend1.example.com:12345 weight=5; |
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51 server backend2.example.com:12345 fail_timeout=5s slow_start=30s; |
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52 server 192.0.2.1:12345 max_fails=3; |
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53 |
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54 server backup1.example.com:12345 backup; |
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55 server backup2.example.com:12345 backup; |
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56 } |
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57 |
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58 server { |
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59 listen 12346; |
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60 proxy_pass tcp; |
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61 health_check; |
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62 } |
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63 </example> |
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64 With this configuration, nginx |
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65 will check the ability to establish a TCP connection to each server |
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66 in the <literal>tcp</literal> group every five seconds. |
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67 When a connection to the server cannot be established, |
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68 the health check will fail, and the server will |
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69 be considered unhealthy. |
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70 </para> |
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71 |
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72 <para> |
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73 Health checks can also be configured to test data obtained from the server. |
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74 Tests are configured separately using the <link id="match"/> directive |
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75 and referenced in the <literal>match</literal> parameter |
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76 of the <link id="health_check"/> directive. |
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77 </para> |
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78 |
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79 </section> |
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80 |
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81 |
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82 <section id="directives" name="Directives"> |
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83 |
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84 <directive name="health_check"> |
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85 <syntax>[<value>parameters</value>]</syntax> |
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86 <default/> |
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87 <context>server</context> |
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88 |
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89 <para> |
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90 Enables periodic health checks of the servers in a |
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91 <link doc="ngx_stream_upstream_module.xml" id="upstream">group</link>. |
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92 </para> |
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93 |
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94 <para> |
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95 The following optional parameters are supported: |
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96 <list type="tag"> |
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97 |
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98 <tag-name id="health_check_interval"> |
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99 <literal>interval</literal>=<value>time</value> |
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100 </tag-name> |
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101 <tag-desc> |
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102 sets the interval between two consecutive health checks, |
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103 by default, 5 seconds. |
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104 </tag-desc> |
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105 |
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106 <tag-name id="health_check_jitter"> |
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107 <literal>jitter</literal>=<value>time</value> |
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108 </tag-name> |
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109 <tag-desc> |
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110 sets the time within which |
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111 each health check will be randomly delayed, |
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112 by default, there is no delay. |
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113 </tag-desc> |
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114 |
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115 <tag-name id="health_check_fails"> |
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116 <literal>fails</literal>=<value>number</value> |
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117 </tag-name> |
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118 <tag-desc> |
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119 sets the number of consecutive failed health checks of a particular server |
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120 after which this server will be considered unhealthy, |
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121 by default, 1. |
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122 </tag-desc> |
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123 |
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124 <tag-name id="health_check_passes"> |
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125 <literal>passes</literal>=<value>number</value> |
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126 </tag-name> |
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127 <tag-desc> |
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128 sets the number of consecutive passed health checks of a particular server |
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129 after which the server will be considered healthy, |
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130 by default, 1. |
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131 </tag-desc> |
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132 |
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133 <tag-name id="health_check_mandatory"> |
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134 <literal>mandatory</literal> |
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135 </tag-name> |
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136 <tag-desc> |
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137 sets the initial “checking” state for a server |
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138 until the first health check is completed (1.11.7). |
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139 If the parameter is not specified, |
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140 the server will be initially considered healthy. |
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141 </tag-desc> |
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142 |
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143 <tag-name id="health_check_match"> |
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144 <literal>match</literal>=<value>name</value> |
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145 </tag-name> |
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146 <tag-desc> |
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147 specifies the <literal>match</literal> block configuring the tests that a |
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148 successful connection should pass in order for a health check to pass. |
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149 By default, for TCP, only the ability |
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150 to establish a TCP connection with the server is checked. |
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151 For <link id="health_check_udp">UDP</link>, the absence of |
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152 ICMP “<literal>Destination Unreachable</literal>” message is expected |
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153 in reply to the sent string “<literal>nginx health check</literal>”. |
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154 <note> |
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155 Prior to version 1.11.7, by default, UDP health check |
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156 required a <link id="hc_match">match</link> block with the |
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157 <link id="match_send">send</link> and <link id="match_expect">expect</link> |
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158 parameters. |
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159 </note> |
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160 </tag-desc> |
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161 |
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162 <tag-name id="health_check_port"> |
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163 <literal>port</literal>=<value>number</value> |
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164 </tag-name> |
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165 <tag-desc> |
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166 defines the port used when connecting to a server |
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167 to perform a health check (1.9.7). |
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168 By default, equals the |
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169 <link doc="ngx_stream_upstream_module.xml" id="server"/> port. |
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170 </tag-desc> |
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171 |
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172 <tag-name id="health_check_udp"> |
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173 <literal>udp</literal> |
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174 </tag-name> |
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175 <tag-desc> |
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176 specifies that the <literal>UDP</literal> protocol should be used for |
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177 health checks instead of the default <literal>TCP</literal> protocol (1.9.13). |
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178 </tag-desc> |
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179 |
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180 </list> |
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181 </para> |
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182 |
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183 </directive> |
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184 |
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185 |
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186 <directive name="health_check_timeout"> |
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187 <syntax><value>timeout</value></syntax> |
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188 <default>5s</default> |
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189 <context>stream</context> |
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190 <context>server</context> |
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191 |
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192 <para> |
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193 Overrides the |
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194 <link doc="ngx_stream_proxy_module.xml" id="proxy_timeout"/> |
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195 value for health checks. |
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196 </para> |
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197 |
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198 </directive> |
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199 |
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200 |
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201 <directive name="match"> |
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202 <syntax block="yes"><value>name</value> </syntax> |
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203 <default/> |
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204 <context>stream</context> |
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205 |
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206 <para> |
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207 Defines the named test set used to verify server responses to health checks. |
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208 </para> |
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209 |
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210 <para> |
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211 The following parameters can be configured: |
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212 <list type="tag"> |
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213 |
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214 <tag-name id="match_send"> |
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215 <literal>send</literal> <value>string</value>; |
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216 </tag-name> |
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217 <tag-desc> |
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218 sends a <value>string</value> to the server; |
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219 </tag-desc> |
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220 |
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221 <tag-name id="match_expect"> |
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222 <literal>expect</literal> <value>string</value> | |
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223 <literal>~</literal> <value>regex</value>; |
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224 </tag-name> |
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225 <tag-desc> |
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226 a literal string (1.9.12) or a regular expression |
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227 that the data obtained from the server should match. |
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228 The regular expression is specified with the preceding |
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229 “<literal>~*</literal>” modifier (for case-insensitive matching), or the |
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230 “<literal>~</literal>” modifier (for case-sensitive matching). |
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231 </tag-desc> |
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232 |
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233 </list> |
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234 Both <literal>send</literal> and <literal>expect</literal> parameters |
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235 can contain hexadecimal literals with the prefix “<literal>\x</literal>” |
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236 followed by two hex digits, for example, “<literal>\x80</literal>” (1.9.12). |
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237 </para> |
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238 |
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239 <para> |
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240 Health check is passed if: |
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241 <list type="bullet"> |
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242 <listitem> |
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243 the TCP connection was successfully established; |
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244 </listitem> |
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245 |
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246 <listitem> |
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247 the <value>string</value> from the <literal>send</literal> parameter, |
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248 if specified, was sent; |
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249 </listitem> |
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250 |
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251 <listitem> |
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252 the data obtained from the server matched the string or regular expression |
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253 from the <literal>expect</literal> parameter, if specified; |
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254 </listitem> |
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255 |
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256 <listitem> |
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257 the time elapsed does not exceed the value specified |
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258 in the <link id="health_check_timeout"/> directive. |
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259 </listitem> |
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260 |
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261 </list> |
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262 </para> |
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263 |
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264 <para> |
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265 Example: |
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266 <example> |
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267 upstream backend { |
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268 zone upstream_backend 10m; |
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269 server 127.0.0.1:12345; |
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270 } |
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271 |
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272 match http { |
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273 send "GET / HTTP/1.0\r\nHost: localhost\r\n\r\n"; |
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274 expect ~ "200 OK"; |
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275 } |
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276 |
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277 server { |
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278 listen 12346; |
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279 proxy_pass backend; |
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280 health_check match=http; |
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281 } |
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282 </example> |
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283 </para> |
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284 |
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285 <para> |
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286 <note> |
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287 Only the first |
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288 <link doc="ngx_stream_proxy_module.xml" id="proxy_buffer_size"/> |
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289 bytes of data obtained from the server are examined. |
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290 </note> |
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291 </para> |
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292 |
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293 </directive> |
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294 |
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295 </section> |
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296 |
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297 </module> |