Mercurial > hg > nginx-site
annotate xml/en/docs/http/ngx_http_upstream_hc_module.xml @ 1993:98b713b0a9fa
Language and style fixes in development guide.
author | Roman Arutyunyan <arut@nginx.com> |
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date | Tue, 30 May 2017 14:30:04 +0300 |
parents | ef22a80a2696 |
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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_http_upstream_hc_module" |
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10 link="/en/docs/http/ngx_http_upstream_hc_module.html" |
589 | 11 lang="en" |
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12 rev="4"> |
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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_http_upstream_hc_module</literal> module |
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18 allows enabling periodic health checks of the servers in a |
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19 <link doc="ngx_http_upstream_module.xml" id="upstream">group</link> |
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20 referenced in the surrounding location. |
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21 The server group must reside in the |
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22 <link doc="ngx_http_upstream_module.xml" id="zone">shared memory</link>. |
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23 </para> |
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24 |
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25 <para> |
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26 If a health check fails, |
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27 the server will be considered unhealthy. |
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28 If several health checks are defined for the same group of servers, |
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29 a single failure of any check will make the corresponding server be |
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30 considered unhealthy. |
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31 Client requests are not passed to unhealthy servers |
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32 and servers in the “checking” state. |
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33 </para> |
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34 |
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35 <para> |
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36 <note> |
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37 Please note that most of the variables will have empty values |
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38 when used with health checks. |
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39 </note> |
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40 </para> |
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41 |
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42 <para> |
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43 <note> |
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44 This module is available as part of our |
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45 <commercial_version>commercial subscription</commercial_version>. |
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46 </note> |
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47 </para> |
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48 |
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49 </section> |
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50 |
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51 |
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52 <section id="example" name="Example Configuration"> |
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53 |
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54 <para> |
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55 <example> |
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56 upstream dynamic { |
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57 zone upstream_dynamic 64k; |
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58 |
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59 server backend1.example.com weight=5; |
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60 server backend2.example.com:8080 fail_timeout=5s slow_start=30s; |
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61 server 192.0.2.1 max_fails=3; |
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62 |
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63 server backup1.example.com:8080 backup; |
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64 server backup2.example.com:8080 backup; |
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65 } |
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66 |
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67 server { |
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68 location / { |
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69 proxy_pass http://dynamic; |
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70 health_check; |
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71 } |
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72 } |
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73 </example> |
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74 With this configuration, nginx will send “<literal>/</literal>” requests to each |
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75 server in the <literal>backend</literal> group every five seconds. |
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76 If any communication error or timeout occurs, or a |
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77 proxied server responds with the status code other than |
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78 2xx or 3xx, the health check will fail, and the server will |
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79 be considered unhealthy. |
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80 </para> |
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81 |
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82 <para> |
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83 Health checks can be configured to test the status code of a response, |
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84 presence of certain header fields and their values, |
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85 and the body contents. |
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86 Tests are configured separately using the <link id="match"/> directive |
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87 and referenced in the <literal>match</literal> parameter |
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88 of the <link id="health_check"/> directive: |
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89 <example> |
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90 http { |
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91 server { |
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92 ... |
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93 location / { |
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94 proxy_pass http://backend; |
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95 health_check match=welcome; |
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96 } |
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97 } |
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98 |
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99 match welcome { |
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100 status 200; |
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101 header Content-Type = text/html; |
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102 body ~ "Welcome to nginx!"; |
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103 } |
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104 } |
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105 </example> |
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106 This configuration shows that in order for a health check to pass, the response |
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107 to a health check request should succeed, have status 200, |
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108 and contain “<literal>Welcome to nginx!</literal>” in the body. |
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109 </para> |
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110 |
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111 </section> |
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112 |
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113 |
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114 <section id="directives" name="Directives"> |
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115 |
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116 <directive name="health_check"> |
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117 <syntax>[<value>parameters</value>]</syntax> |
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118 <default/> |
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119 <context>location</context> |
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120 |
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121 <para> |
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122 Enables periodic health checks of the servers in a |
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123 <link doc="ngx_http_upstream_module.xml" id="upstream">group</link> |
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124 referenced in the surrounding location. |
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125 </para> |
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126 |
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127 <para> |
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128 The following optional parameters are supported: |
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129 <list type="tag"> |
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130 |
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131 <tag-name id="health_check_interval"> |
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132 <literal>interval</literal>=<value>time</value> |
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133 </tag-name> |
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134 <tag-desc> |
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135 sets the interval between two consecutive health checks, |
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136 by default, 5 seconds. |
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137 </tag-desc> |
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138 |
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139 <tag-name id="health_check_jitter"> |
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140 <literal>jitter</literal>=<value>time</value> |
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141 </tag-name> |
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142 <tag-desc> |
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143 sets the time within which |
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144 each health check will be randomly delayed, |
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145 by default, there is no delay. |
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146 </tag-desc> |
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147 |
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148 <tag-name id="health_check_fails"> |
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149 <literal>fails</literal>=<value>number</value> |
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150 </tag-name> |
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151 <tag-desc> |
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152 sets the number of consecutive failed health checks of a particular server |
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153 after which this server will be considered unhealthy, |
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154 by default, 1. |
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155 </tag-desc> |
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156 |
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157 <tag-name id="health_check_passes"> |
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158 <literal>passes</literal>=<value>number</value> |
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159 </tag-name> |
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160 <tag-desc> |
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161 sets the number of consecutive passed health checks of a particular server |
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162 after which the server will be considered healthy, |
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163 by default, 1. |
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164 </tag-desc> |
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165 |
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166 <tag-name id="health_check_uri"> |
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167 <literal>uri</literal>=<value>uri</value> |
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168 </tag-name> |
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169 <tag-desc> |
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170 defines the URI used in health check requests, |
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171 by default, “<literal>/</literal>”. |
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172 </tag-desc> |
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173 |
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174 <tag-name id="health_check_mandatory"> |
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175 <literal>mandatory</literal> |
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176 </tag-name> |
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177 <tag-desc> |
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178 sets the initial “checking” state for a server |
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179 until the first health check is completed (1.11.7). |
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180 Client requests are not passed to servers in the “checking” state. |
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181 If the parameter is not specified, |
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182 the server will be initially considered healthy. |
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183 </tag-desc> |
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184 |
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185 <tag-name id="health_check_match"> |
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186 <literal>match</literal>=<value>name</value> |
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187 </tag-name> |
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188 <tag-desc> |
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189 specifies the <literal>match</literal> block configuring the tests that a |
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190 response should pass in order for a health check to pass. |
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191 By default, the response should have status code 2xx or 3xx. |
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192 </tag-desc> |
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193 |
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194 <tag-name id="health_check_port"> |
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195 <literal>port</literal>=<value>number</value> |
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196 </tag-name> |
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197 <tag-desc> |
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198 defines the port used when connecting to a server |
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199 to perform a health check (1.9.7). |
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200 By default, equals the |
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201 <link doc="ngx_http_upstream_module.xml" id="server"/> port. |
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202 </tag-desc> |
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203 |
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204 </list> |
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205 </para> |
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206 |
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207 </directive> |
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208 |
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209 |
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210 <directive name="match"> |
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211 <syntax block="yes"><value>name</value></syntax> |
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212 <default/> |
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213 <context>http</context> |
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214 |
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215 <para> |
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216 Defines the named test set used to verify responses to health check requests. |
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217 </para> |
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218 |
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219 <para> |
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220 The following items can be tested in a response: |
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221 <list type="tag"> |
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222 |
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223 <tag-name><literal>status 200;</literal></tag-name> |
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224 <tag-desc>status is 200</tag-desc> |
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225 |
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226 <tag-name><literal>status ! 500;</literal></tag-name> |
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227 <tag-desc>status is not 500</tag-desc> |
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228 |
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229 <tag-name><literal>status 200 204;</literal></tag-name> |
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230 <tag-desc>status is 200 or 204</tag-desc> |
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231 |
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232 <tag-name><literal>status ! 301 302;</literal></tag-name> |
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233 <tag-desc>status is neither 301 nor 302</tag-desc> |
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234 |
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235 <tag-name><literal>status 200-399;</literal></tag-name> |
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237 |
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238 <tag-name><literal>status ! 400-599;</literal></tag-name> |
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240 |
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241 <tag-name><literal>status 301-303 307;</literal></tag-name> |
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242 <tag-desc>status is either 301, 302, 303, or 307</tag-desc> |
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243 |
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244 </list> |
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245 |
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246 <list type="tag"> |
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247 |
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248 <tag-name><literal>header Content-Type = text/html;</literal></tag-name> |
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249 <tag-desc> |
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250 header contains <header>Content-Type</header> |
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251 with value <literal>text/html</literal> |
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252 </tag-desc> |
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253 |
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254 <tag-name><literal>header Content-Type != text/html;</literal></tag-name> |
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255 <tag-desc> |
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256 header contains <header>Content-Type</header> |
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257 with value other than <literal>text/html</literal> |
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258 </tag-desc> |
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259 |
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260 <tag-name><literal>header Connection ~ close;</literal></tag-name> |
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261 <tag-desc> |
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262 header contains <header>Connection</header> |
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263 with value matching regular expression <literal>close</literal> |
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264 </tag-desc> |
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265 |
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266 <tag-name><literal>header Connection !~ close;</literal></tag-name> |
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267 <tag-desc> |
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268 header contains <header>Connection</header> |
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269 with value not matching regular expression <literal>close</literal> |
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270 </tag-desc> |
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271 |
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272 <tag-name><literal>header Host;</literal></tag-name> |
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273 <tag-desc>header contains <header>Host</header></tag-desc> |
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274 |
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275 <tag-name><literal>header ! X-Accel-Redirect;</literal></tag-name> |
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276 <tag-desc>header lacks <header>X-Accel-Redirect</header></tag-desc> |
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277 |
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278 </list> |
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279 |
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280 <list type="tag"> |
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281 |
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282 <tag-name><literal>body ~ "Welcome to nginx!";</literal></tag-name> |
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283 <tag-desc> |
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284 body matches regular expression “<literal>Welcome to nginx!</literal>” |
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285 </tag-desc> |
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286 |
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287 <tag-name><literal>body !~ "Welcome to nginx!";</literal></tag-name> |
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288 <tag-desc> |
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289 body does not match regular expression “<literal>Welcome to nginx!</literal>” |
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290 </tag-desc> |
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291 |
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292 </list> |
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293 </para> |
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294 |
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295 <para> |
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296 If several tests are specified, |
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297 the response matches only if it matches all tests. |
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298 <note> |
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299 Only the first 256k of the response body are examined. |
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300 </note> |
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301 </para> |
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302 |
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303 <para> |
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304 Examples: |
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305 <example> |
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306 # status is 200, content type is "text/html", |
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307 # and body contains "Welcome to nginx!" |
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308 match welcome { |
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309 status 200; |
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310 header Content-Type = text/html; |
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311 body ~ "Welcome to nginx!"; |
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312 } |
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313 </example> |
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314 |
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315 <example> |
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316 # status is not one of 301, 302, 303, or 307, and header does not have "Refresh:" |
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317 match not_redirect { |
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318 status ! 301-303 307; |
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319 header ! Refresh; |
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320 } |
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321 </example> |
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322 |
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323 <example> |
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324 # status ok and not in maintenance mode |
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325 match server_ok { |
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326 status 200-399; |
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327 body !~ "maintenance mode"; |
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328 } |
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329 </example> |
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330 |
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331 </para> |
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332 |
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333 </directive> |
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334 |
293
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335 </section> |
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336 |
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337 </module> |