Mercurial > hg > nginx-site
annotate xml/en/docs/stream/ngx_stream_upstream_module.xml @ 1877:aa29a64a5e9d
Documented ssl_session_ticket_key 80-byte keys.
author | Maxim Dounin <mdounin@mdounin.ru> |
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date | Mon, 26 Dec 2016 16:06:26 +0300 |
parents | 6f2c5a36b4d1 |
children | 6225d50b3cba |
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_module" |
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10 link="/en/docs/stream/ngx_stream_upstream_module.html" |
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11 lang="en" |
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12 rev="22"> |
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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_module</literal> module (1.9.0) |
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18 is used to define groups of servers that can be referenced |
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19 by the <link doc="ngx_stream_proxy_module.xml" id="proxy_pass"/> |
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20 directive. |
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21 </para> |
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22 |
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23 </section> |
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24 |
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25 |
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26 <section id="example" name="Example Configuration"> |
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27 |
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28 <para> |
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29 <example> |
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30 upstream <emphasis>backend</emphasis> { |
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31 hash $remote_addr consistent; |
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32 |
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33 server backend1.example.com:12345 weight=5; |
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34 server backend2.example.com:12345; |
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35 server unix:/tmp/backend3; |
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36 |
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37 server backup1.example.com:12345 backup; |
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38 server backup2.example.com:12345 backup; |
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39 } |
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40 |
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41 server { |
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42 listen 12346; |
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43 proxy_pass <emphasis>backend</emphasis>; |
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44 } |
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45 </example> |
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46 </para> |
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47 |
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48 <para> |
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49 Dynamically configurable group, |
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50 available as part of our |
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51 <commercial_version>commercial subscription</commercial_version>: |
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52 <example> |
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53 resolver 10.0.0.1; |
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54 |
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55 upstream <emphasis>dynamic</emphasis> { |
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56 zone upstream_dynamic 64k; |
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57 |
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58 server backend1.example.com:12345 weight=5; |
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59 server backend2.example.com:12345 fail_timeout=5s slow_start=30s; |
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60 server 192.0.2.1:12345 max_fails=3; |
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61 server backend3.example.com:12345 resolve; |
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62 server backend4.example.com service=http resolve; |
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63 |
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64 server backup1.example.com:12345 backup; |
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65 server backup2.example.com:12345 backup; |
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66 } |
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67 |
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68 server { |
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69 listen 12346; |
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70 proxy_pass <emphasis>dynamic</emphasis>; |
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71 health_check; |
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72 } |
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73 </example> |
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74 </para> |
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75 |
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76 </section> |
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77 |
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78 |
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79 <section id="directives" name="Directives"> |
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80 |
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81 <directive name="upstream"> |
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82 <syntax block="yes"><value>name</value></syntax> |
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83 <default/> |
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84 <context>stream</context> |
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85 |
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86 <para> |
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87 Defines a group of servers. |
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88 Servers can listen on different ports. |
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89 In addition, servers listening on TCP and UNIX-domain sockets |
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90 can be mixed. |
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91 </para> |
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92 |
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93 <para> |
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94 Example: |
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95 <example> |
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96 upstream backend { |
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97 server backend1.example.com:12345 weight=5; |
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98 server 127.0.0.1:12345 max_fails=3 fail_timeout=30s; |
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99 server unix:/tmp/backend2; |
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100 server backend3.example.com:12345 resolve; |
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101 |
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102 server backup1.example.com:12345 backup; |
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103 } |
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104 </example> |
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105 </para> |
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106 |
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107 <para> |
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108 By default, connections are distributed between the servers using a |
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109 weighted round-robin balancing method. |
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110 In the above example, each 7 connections will be distributed as follows: |
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111 5 connections go to <literal>backend1.example.com:12345</literal> |
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112 and one connection to each of the second and third servers. |
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113 If an error occurs during communication with a server, the connection will |
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114 be passed to the next server, and so on until all of the functioning |
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115 servers will be tried. |
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116 If communication with all servers fails, the connection will be closed. |
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117 </para> |
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118 |
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119 </directive> |
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120 |
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121 |
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122 <directive name="server"> |
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123 <syntax><value>address</value> [<value>parameters</value>]</syntax> |
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124 <default/> |
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125 <context>upstream</context> |
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126 |
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127 <para> |
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128 Defines the <value>address</value> and other <value>parameters</value> |
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129 of a server. |
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130 The address can be specified as a domain name or IP address |
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131 with an obligatory port, or as a UNIX-domain socket path |
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132 specified after the “<literal>unix:</literal>” prefix. |
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133 A domain name that resolves to several IP addresses defines |
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134 multiple servers at once. |
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135 </para> |
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136 |
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137 <para> |
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138 The following parameters can be defined: |
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139 <list type="tag"> |
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140 |
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141 <tag-name id="weight"> |
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142 <literal>weight</literal>=<value>number</value> |
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143 </tag-name> |
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144 <tag-desc> |
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145 sets the weight of the server, by default, 1. |
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146 </tag-desc> |
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147 |
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148 <tag-name id="max_conns"> |
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149 <literal>max_conns</literal>=<value>number</value> |
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150 </tag-name> |
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151 <tag-desc> |
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152 limits the maximum <value>number</value> of simultaneous |
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153 connections to the proxied server (1.11.5). |
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154 Default value is zero, meaning there is no limit. |
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155 If the server group does not reside in the <link id="zone">shared memory</link>, |
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156 the limitation works per each worker process. |
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157 <note> |
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158 Prior to version 1.11.5, this parameter was available as part of our |
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159 <commercial_version>commercial subscription</commercial_version>. |
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160 </note> |
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161 </tag-desc> |
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162 |
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163 <tag-name id="max_fails"> |
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164 <literal>max_fails</literal>=<value>number</value> |
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165 </tag-name> |
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166 <tag-desc> |
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167 sets the number of unsuccessful attempts to communicate with the server |
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168 that should happen in the duration set by the <literal>fail_timeout</literal> |
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169 parameter to consider the server unavailable for a duration also set by the |
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170 <literal>fail_timeout</literal> parameter. |
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171 By default, the number of unsuccessful attempts is set to 1. |
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172 The zero value disables the accounting of attempts. |
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173 Here, an unsuccessful attempt is an error or timeout |
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174 while establishing a connection with the server. |
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175 </tag-desc> |
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176 |
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177 <tag-name id="fail_timeout"> |
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178 <literal>fail_timeout</literal>=<value>time</value> |
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179 </tag-name> |
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180 <tag-desc> |
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181 sets |
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182 <list type="bullet"> |
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183 |
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184 <listitem> |
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185 the time during which the specified number of unsuccessful attempts to |
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186 communicate with the server should happen to consider the server unavailable; |
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187 </listitem> |
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188 |
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189 <listitem> |
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190 and the period of time the server will be considered unavailable. |
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191 </listitem> |
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192 |
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193 </list> |
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194 By default, the parameter is set to 10 seconds. |
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195 </tag-desc> |
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196 |
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197 <tag-name id="backup"> |
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198 <literal>backup</literal> |
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199 </tag-name> |
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200 <tag-desc> |
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201 marks the server as a backup server. |
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202 Connections to the backup server will be passed |
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203 when the primary servers are unavailable. |
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204 </tag-desc> |
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205 |
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206 <tag-name id="down"> |
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207 <literal>down</literal> |
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208 </tag-name> |
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209 <tag-desc> |
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210 marks the server as permanently unavailable. |
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211 </tag-desc> |
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212 |
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213 </list> |
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214 </para> |
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215 |
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216 <para> |
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217 Additionally, |
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218 the following parameters are available as part of our |
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219 <commercial_version>commercial subscription</commercial_version>: |
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220 <list type="tag"> |
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221 |
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222 <tag-name id="resolve"> |
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223 <literal>resolve</literal> |
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224 </tag-name> |
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225 <tag-desc> |
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226 monitors changes of the IP addresses |
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227 that correspond to a domain name of the server, |
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228 and automatically modifies the upstream configuration |
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229 without the need of restarting nginx. |
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230 The server group must reside in the <link id="zone">shared memory</link>. |
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231 <para> |
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232 In order for this parameter to work, |
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233 the <link doc="ngx_stream_core_module.xml" id="resolver"/> directive |
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234 must be specified in the |
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235 <link doc="ngx_stream_core_module.xml" id="stream"/> block. |
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236 Example: |
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237 <example> |
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238 stream { |
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239 resolver 10.0.0.1; |
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240 |
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241 upstream u { |
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242 zone ...; |
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243 ... |
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244 server example.com:12345 resolve; |
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245 } |
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246 } |
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247 </example> |
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248 </para> |
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249 </tag-desc> |
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250 |
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251 <tag-name id="service"> |
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252 <literal>service</literal>=<value>name</value> |
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253 </tag-name> |
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254 <tag-desc> |
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255 enables resolving of DNS |
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256 <link url="https://tools.ietf.org/html/rfc2782">SRV</link> |
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257 records and sets the service <value>name</value> (1.9.13). |
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258 In order for this parameter to work, it is necessary to specify |
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259 the <link id="resolve"/> parameter for the server |
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260 and specify a hostname without a port number. |
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261 <para> |
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262 If the service name does not contain a dot (“<literal>.</literal>”), then |
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263 the <link url="https://tools.ietf.org/html/rfc2782">RFC</link>-compliant name |
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264 is constructed |
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265 and the TCP protocol is added to the service prefix. |
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266 For example, to look up the |
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267 <literal>_http._tcp.backend.example.com</literal> SRV record, |
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268 it is necessary to specify the directive: |
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269 <example> |
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270 server backend.example.com service=http resolve; |
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271 </example> |
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272 If the service name contains one or more dots, then the name is constructed |
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273 by joining the service prefix and the server name. |
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274 For example, to look up the <literal>_http._tcp.backend.example.com</literal> |
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275 and <literal>server1.backend.example.com</literal> SRV records, |
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276 it is necessary to specify the directives: |
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277 <example> |
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278 server backend.example.com service=_http._tcp resolve; |
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279 server example.com service=server1.backend resolve; |
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280 </example> |
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281 </para> |
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282 |
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283 <para> |
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284 Highest-priority SRV records |
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285 (records with the same lowest-number priority value) |
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286 are resolved as primary servers, |
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287 the rest of SRV records are resolved as backup servers. |
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288 If the <link id="backup"/> parameter is specified for the server, |
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289 high-priority SRV records are resolved as backup servers, |
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290 the rest of SRV records are ignored. |
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291 </para> |
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292 </tag-desc> |
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293 |
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294 <tag-name id="slow_start"> |
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295 <literal>slow_start</literal>=<value>time</value> |
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296 </tag-name> |
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297 <tag-desc> |
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298 sets the <value>time</value> during which the server will recover its weight |
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299 from zero to a nominal value, when unhealthy server becomes |
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300 <link id="health_check">healthy</link>, |
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301 or when the server becomes available after a period of time |
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302 it was considered <link id="fail_timeout">unavailable</link>. |
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303 Default value is zero, i.e. slow start is disabled. |
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304 <note> |
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305 The parameter cannot be used along with the |
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306 <link id="hash"/> load balancing method. |
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307 </note> |
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308 </tag-desc> |
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309 |
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310 </list> |
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311 </para> |
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312 |
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313 <para> |
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314 <note> |
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315 If there is only a single server in a group, <literal>max_fails</literal>, |
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316 <literal>fail_timeout</literal> and <literal>slow_start</literal> parameters |
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317 are ignored, and such a server will never be considered unavailable. |
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318 </note> |
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319 </para> |
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320 |
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321 </directive> |
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322 |
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323 |
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324 <directive name="zone"> |
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325 <syntax><value>name</value> [<value>size</value>]</syntax> |
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326 <default/> |
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327 <context>upstream</context> |
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328 |
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329 <para> |
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330 Defines the <value>name</value> and <value>size</value> of the shared |
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331 memory zone that keeps the group’s configuration and run-time state that are |
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332 shared between worker processes. |
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333 Several groups may share the same zone. |
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334 In this case, it is enough to specify the zone size only once. |
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335 </para> |
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336 |
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337 <para> |
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338 Additionally, |
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339 as part of our <commercial_version>commercial subscription</commercial_version>, |
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340 such groups allow changing the group membership |
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341 or modifying the settings of a particular server |
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342 without the need of restarting nginx. |
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343 The configuration is accessible via a special location |
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344 handled by |
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345 <link doc="../http/ngx_http_upstream_conf_module.xml" id="upstream_conf"/>. |
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346 </para> |
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347 |
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348 </directive> |
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349 |
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350 |
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351 <directive name="state"> |
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352 <syntax><value>file</value></syntax> |
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353 <default/> |
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354 <context>upstream</context> |
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355 <appeared-in>1.9.7</appeared-in> |
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356 |
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357 <para> |
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358 Specifies a <value>file</value> that keeps the state |
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359 of the dynamically configurable group. |
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360 </para> |
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361 |
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362 <para> |
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363 Examples: |
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364 <example> |
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365 state /var/lib/nginx/state/servers.conf; # path for Linux |
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366 state /var/db/nginx/state/servers.conf; # path for FreeBSD |
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367 </example> |
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368 </para> |
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369 |
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370 <para> |
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371 The state is currently limited to the list of servers with their parameters. |
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372 The file is read when parsing the configuration and is updated each time |
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373 the upstream configuration is |
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374 <link doc="ngx_http_upstream_conf_module.xml" id="upstream_conf">changed</link>. |
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375 Changing the file content directly should be avoided. |
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376 The directive cannot be used |
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377 along with the <link id="server"/> directive. |
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378 </para> |
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379 |
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380 <para> |
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381 <note> |
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382 Changes made during |
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383 <link doc="../control.xml" id="reconfiguration">configuration reload</link> |
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384 or <link doc="../control.xml" id="upgrade">binary upgrade</link> |
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385 can be lost. |
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386 </note> |
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387 </para> |
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388 |
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389 <para> |
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390 <note> |
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391 This directive is available as part of our |
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392 <commercial_version>commercial subscription</commercial_version>. |
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393 </note> |
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394 </para> |
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395 |
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396 </directive> |
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397 |
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398 |
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399 <directive name="hash"> |
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400 <syntax><value>key</value> [<literal>consistent</literal>]</syntax> |
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401 <default/> |
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402 <context>upstream</context> |
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403 |
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404 <para> |
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405 Specifies a load balancing method for a server group |
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406 where client-server mapping is based on the hashed <value>key</value> value. |
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407 The <value>key</value> can contain text, variables, |
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408 and their combinations (1.11.2). |
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409 Usage example: |
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410 <example> |
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411 hash $remote_addr; |
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412 </example> |
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413 Note that adding or removing a server from the group |
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414 may result in remapping most of the keys to different servers. |
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415 The method is compatible with the |
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416 <link url="http://search.cpan.org/perldoc?Cache%3A%3AMemcached">Cache::Memcached</link> |
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417 Perl library. |
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418 </para> |
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419 |
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420 <para> |
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421 If the <literal>consistent</literal> parameter is specified, |
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422 the <link url="http://www.last.fm/user/RJ/journal/2007/04/10/392555/">ketama</link> |
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423 consistent hashing method will be used instead. |
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424 The method ensures that only a few keys |
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425 will be remapped to different servers |
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426 when a server is added to or removed from the group. |
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427 This helps to achieve a higher cache hit ratio for caching servers. |
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428 The method is compatible with the |
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429 <link url="http://search.cpan.org/perldoc?Cache%3A%3AMemcached%3A%3AFast">Cache::Memcached::Fast</link> |
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430 Perl library with the <value>ketama_points</value> parameter set to 160. |
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431 </para> |
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432 |
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433 </directive> |
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434 |
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|
435 |
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|
436 <directive name="least_conn"> |
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437 <syntax/> |
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|
438 <default/> |
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439 <context>upstream</context> |
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|
440 |
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441 <para> |
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442 Specifies that a server group should use a load balancing method |
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|
443 where a connection |
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444 is passed to the server with the least number of active connections, |
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445 taking into account weights of servers. |
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446 If there are several such servers, they are tried in turn using a |
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|
447 weighted round-robin balancing method. |
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|
448 </para> |
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|
449 |
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|
450 </directive> |
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|
451 |
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452 |
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453 <directive name="least_time"> |
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454 <syntax><literal>connect</literal> | |
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455 <literal>first_byte</literal> | |
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456 <literal>last_byte</literal></syntax> |
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457 <default/> |
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458 <context>upstream</context> |
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459 |
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460 <para> |
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461 Specifies that a group should use a load balancing method where a connection |
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462 is passed to the server with the least average time and |
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463 least number of active connections, taking into account weights of servers. |
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464 If there are several such servers, they are tried in turn using a |
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465 weighted round-robin balancing method. |
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466 </para> |
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467 |
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468 <para> |
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469 If the <literal>connect</literal> parameter is specified, |
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470 time to connect to the upstream server is used. |
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|
471 If the <literal>first_byte</literal> parameter is specified, |
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|
472 time to receive the first byte of data is used. |
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473 If the <literal>last_byte</literal> is specified, |
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|
474 time to receive the last byte of data is used. |
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|
475 </para> |
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|
476 |
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477 <para> |
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478 <note> |
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479 This directive is available as part of our |
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480 <commercial_version>commercial subscription</commercial_version>. |
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481 </note> |
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482 </para> |
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|
483 |
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484 </directive> |
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|
485 |
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486 |
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|
487 <directive name="health_check"> |
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|
488 <syntax>[<value>parameters</value>]</syntax> |
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489 <default/> |
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|
490 <context>server</context> |
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|
491 |
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|
492 <para> |
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|
493 Enables periodic health checks of the servers in a |
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|
494 <link id="upstream">group</link>. |
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|
495 </para> |
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|
496 |
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497 <para> |
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498 The following optional parameters are supported: |
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|
499 <list type="tag"> |
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|
500 |
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|
501 <tag-name id="interval"> |
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502 <literal>interval</literal>=<value>time</value> |
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|
503 </tag-name> |
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|
504 <tag-desc> |
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|
505 sets the interval between two consecutive health checks, |
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|
506 by default, 5 seconds; |
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|
507 </tag-desc> |
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|
508 |
1866
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509 <tag-name id="health_check_jitter"> |
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510 <literal>jitter</literal>=<value>time</value> |
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|
511 </tag-name> |
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|
512 <tag-desc> |
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|
513 sets the time within which |
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|
514 each health check will be randomly delayed, |
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|
515 by default, there is no delay; |
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|
516 </tag-desc> |
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|
517 |
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518 <tag-name id="fails"> |
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519 <literal>fails</literal>=<value>number</value> |
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|
520 </tag-name> |
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|
521 <tag-desc> |
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|
522 sets the number of consecutive failed health checks of a particular server |
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523 after which this server will be considered unhealthy, |
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|
524 by default, 1; |
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|
525 </tag-desc> |
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|
526 |
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|
527 <tag-name id="passes"> |
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|
528 <literal>passes</literal>=<value>number</value> |
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|
529 </tag-name> |
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|
530 <tag-desc> |
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531 sets the number of consecutive passed health checks of a particular server |
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|
532 after which the server will be considered healthy, |
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|
533 by default, 1; |
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|
534 </tag-desc> |
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|
535 |
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|
536 <tag-name id="hc_match"> |
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|
537 <literal>match</literal>=<value>name</value> |
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|
538 </tag-name> |
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|
539 <tag-desc> |
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|
540 specifies the <literal>match</literal> block configuring the tests that a |
1680
57c3f36b3b6a
Updated docs for the upcoming NGINX Plus release.
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|
541 successful connection should pass in order for a health check to pass. |
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changeset
|
542 By default, |
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changeset
|
543 only the ability to establish a TCP connection with the server is checked; |
1636
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|
544 </tag-desc> |
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|
545 |
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|
546 <tag-name id="health_check_port"> |
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|
547 <literal>port</literal>=<value>number</value> |
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|
548 </tag-name> |
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diff
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|
549 <tag-desc> |
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changeset
|
550 defines the port used when connecting to a server |
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changeset
|
551 to perform a health check (1.9.7); |
1680
57c3f36b3b6a
Updated docs for the upcoming NGINX Plus release.
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changeset
|
552 by default, equals the <link id="server"/> port; |
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changeset
|
553 </tag-desc> |
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diff
changeset
|
554 |
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diff
changeset
|
555 <tag-name id="health_check_udp"> |
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|
556 <literal>udp</literal> |
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changeset
|
557 </tag-name> |
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changeset
|
558 <tag-desc> |
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diff
changeset
|
559 specifies that the <literal>UDP</literal> protocol should be used for |
57c3f36b3b6a
Updated docs for the upcoming NGINX Plus release.
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changeset
|
560 health checks instead of the default <literal>TCP</literal> protocol (1.9.13); |
57c3f36b3b6a
Updated docs for the upcoming NGINX Plus release.
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diff
changeset
|
561 requires a <link id="hc_match">match</link> block with the |
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changeset
|
562 <link id="match_send">send</link> and <link id="match_expect">expect</link> |
57c3f36b3b6a
Updated docs for the upcoming NGINX Plus release.
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diff
changeset
|
563 parameters. |
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|
564 </tag-desc> |
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changeset
|
565 |
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diff
changeset
|
566 </list> |
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changeset
|
567 </para> |
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diff
changeset
|
568 |
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diff
changeset
|
569 <para> |
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|
570 For example, |
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|
571 <example> |
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|
572 server { |
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changeset
|
573 proxy_pass backend; |
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|
574 health_check; |
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|
575 } |
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|
576 </example> |
1680
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diff
changeset
|
577 will check the ability to establish a TCP connection to each server |
57c3f36b3b6a
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parents:
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diff
changeset
|
578 in the <literal>backend</literal> group every five seconds. |
1450
f5b5eefc43cb
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parents:
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|
579 When a connection to the server cannot be established, |
f5b5eefc43cb
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changeset
|
580 the health check will fail, and the server will |
f5b5eefc43cb
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diff
changeset
|
581 be considered unhealthy. |
f5b5eefc43cb
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diff
changeset
|
582 Client connections are not passed to unhealthy servers. |
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diff
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|
583 </para> |
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parents:
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diff
changeset
|
584 |
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diff
changeset
|
585 <para> |
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changeset
|
586 Health checks can also be configured to test data obtained from the server. |
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changeset
|
587 Tests are configured separately using the <link id="match"/> directive |
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Updated commercial docs for the upcoming release.
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changeset
|
588 and referenced in the <literal>match</literal> parameter. |
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|
589 </para> |
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parents:
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diff
changeset
|
590 |
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diff
changeset
|
591 <para> |
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diff
changeset
|
592 The server group must reside in the <link id="zone">shared memory</link>. |
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|
593 </para> |
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parents:
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diff
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|
594 |
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diff
changeset
|
595 <para> |
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changeset
|
596 If several health checks are defined for the same group of servers, |
f5b5eefc43cb
Updated commercial docs for the upcoming release.
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changeset
|
597 a single failure of any check will make the corresponding server be |
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diff
changeset
|
598 considered unhealthy. |
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parents:
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diff
changeset
|
599 </para> |
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diff
changeset
|
600 |
1462
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Vladimir Homutov <vl@nginx.com>
parents:
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diff
changeset
|
601 <para> |
e69e4dbcc760
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Vladimir Homutov <vl@nginx.com>
parents:
1450
diff
changeset
|
602 <note> |
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Documented OSS stream modules.
Vladimir Homutov <vl@nginx.com>
parents:
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diff
changeset
|
603 This directive is available as part of our |
e69e4dbcc760
Documented OSS stream modules.
Vladimir Homutov <vl@nginx.com>
parents:
1450
diff
changeset
|
604 <commercial_version>commercial subscription</commercial_version>. |
e69e4dbcc760
Documented OSS stream modules.
Vladimir Homutov <vl@nginx.com>
parents:
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diff
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|
605 </note> |
e69e4dbcc760
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Vladimir Homutov <vl@nginx.com>
parents:
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diff
changeset
|
606 </para> |
e69e4dbcc760
Documented OSS stream modules.
Vladimir Homutov <vl@nginx.com>
parents:
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diff
changeset
|
607 |
1450
f5b5eefc43cb
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diff
changeset
|
608 </directive> |
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parents:
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diff
changeset
|
609 |
f5b5eefc43cb
Updated commercial docs for the upcoming release.
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|
610 |
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|
611 <directive name="health_check_timeout"> |
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diff
changeset
|
612 <syntax><value>timeout</value></syntax> |
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diff
changeset
|
613 <default>5s</default> |
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diff
changeset
|
614 <context>stream</context> |
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|
615 <context>server</context> |
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|
616 |
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617 <para> |
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|
618 Overrides the |
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619 <link doc="ngx_stream_proxy_module.xml" id="proxy_timeout"/> |
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|
620 value for health checks. |
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|
621 </para> |
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|
622 |
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623 <para> |
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624 <note> |
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625 This directive is available as part of our |
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626 <commercial_version>commercial subscription</commercial_version>. |
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627 </note> |
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|
628 </para> |
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|
629 |
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630 </directive> |
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631 |
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|
632 |
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633 <directive name="match"> |
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634 <syntax block="yes"><value>name</value> </syntax> |
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635 <default/> |
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636 <context>stream</context> |
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|
637 |
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638 <para> |
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639 Defines the named test set used to verify server responses to health checks. |
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640 </para> |
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|
641 |
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642 <para> |
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643 The following parameters can be configured: |
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|
644 <list type="tag"> |
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|
645 |
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646 <tag-name id="match_send"> |
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647 <literal>send</literal> <value>string</value>; |
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648 </tag-name> |
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649 <tag-desc> |
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650 sends a <value>string</value> to the server; |
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|
651 </tag-desc> |
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|
652 |
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|
653 <tag-name id="match_expect"> |
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|
654 <literal>expect</literal> <value>string</value> | |
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|
655 <literal>~</literal> <value>regex</value>; |
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|
656 </tag-name> |
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|
657 <tag-desc> |
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658 a literal string (1.9.12) or a regular expression |
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|
659 that the data obtained from the server should match. |
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660 The regular expression is specified with the preceding |
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|
661 “<literal>~*</literal>” modifier (for case-insensitive matching), or the |
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|
662 “<literal>~</literal>” modifier (for case-sensitive matching). |
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|
663 </tag-desc> |
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|
664 |
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|
665 </list> |
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|
666 Both <literal>send</literal> and <literal>expect</literal> parameters |
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|
667 can contain hexadecimal literals with the prefix “<literal>\x</literal>” |
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|
668 followed by two hex digits, for example, “<literal>\x80</literal>” (1.9.12). |
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|
669 </para> |
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|
670 |
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|
671 <para> |
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|
672 Health check is passed if: |
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|
673 <list type="bullet"> |
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|
674 <listitem> |
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|
675 the TCP connection was successfully established; |
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|
676 </listitem> |
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|
677 |
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|
678 <listitem> |
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|
679 the <value>string</value> from the <literal>send</literal> parameter, |
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|
680 if specified, was sent; |
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|
681 </listitem> |
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|
682 |
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|
683 <listitem> |
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|
684 the data obtained from the server matched the string or regular expression |
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|
685 from the <literal>expect</literal> parameter, if specified; |
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|
686 </listitem> |
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|
687 |
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|
688 <listitem> |
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|
689 the time elapsed does not exceed the value specified |
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|
690 in the <link id="health_check_timeout"/> directive. |
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|
691 </listitem> |
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|
692 |
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|
693 </list> |
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|
694 </para> |
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|
695 |
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|
696 <para> |
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|
697 Example: |
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|
698 <example> |
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|
699 upstream backend { |
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|
700 zone upstream_backend 10m; |
f5b5eefc43cb
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|
701 server 127.0.0.1:12345; |
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|
702 } |
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|
703 |
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|
704 match http { |
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parents:
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diff
changeset
|
705 send "GET / HTTP/1.0\r\nHost: localhost\r\n\r\n"; |
f5b5eefc43cb
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changeset
|
706 expect ~ "200 OK"; |
f5b5eefc43cb
Updated commercial docs for the upcoming release.
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diff
changeset
|
707 } |
f5b5eefc43cb
Updated commercial docs for the upcoming release.
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parents:
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diff
changeset
|
708 |
f5b5eefc43cb
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diff
changeset
|
709 server { |
f5b5eefc43cb
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parents:
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diff
changeset
|
710 listen 12346; |
f5b5eefc43cb
Updated commercial docs for the upcoming release.
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parents:
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diff
changeset
|
711 proxy_pass backend; |
f5b5eefc43cb
Updated commercial docs for the upcoming release.
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parents:
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|
712 health_check match=http; |
f5b5eefc43cb
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|
713 } |
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parents:
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diff
changeset
|
714 </example> |
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parents:
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diff
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|
715 </para> |
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parents:
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changeset
|
716 |
f5b5eefc43cb
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diff
changeset
|
717 <para> |
f5b5eefc43cb
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|
718 <note> |
f5b5eefc43cb
Updated commercial docs for the upcoming release.
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parents:
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diff
changeset
|
719 Only the first |
1654
f5dcf57c5eb5
Corrected note in the stream "match" directive.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1636
diff
changeset
|
720 <link doc="ngx_stream_proxy_module.xml" id="proxy_buffer_size"/> |
1450
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parents:
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changeset
|
721 bytes of data obtained from the server are examined. |
f5b5eefc43cb
Updated commercial docs for the upcoming release.
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parents:
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diff
changeset
|
722 </note> |
f5b5eefc43cb
Updated commercial docs for the upcoming release.
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parents:
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diff
changeset
|
723 </para> |
f5b5eefc43cb
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parents:
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diff
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|
724 |
1462
e69e4dbcc760
Documented OSS stream modules.
Vladimir Homutov <vl@nginx.com>
parents:
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diff
changeset
|
725 <para> |
e69e4dbcc760
Documented OSS stream modules.
Vladimir Homutov <vl@nginx.com>
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diff
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|
726 <note> |
e69e4dbcc760
Documented OSS stream modules.
Vladimir Homutov <vl@nginx.com>
parents:
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changeset
|
727 This directive is available as part of our |
e69e4dbcc760
Documented OSS stream modules.
Vladimir Homutov <vl@nginx.com>
parents:
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diff
changeset
|
728 <commercial_version>commercial subscription</commercial_version>. |
e69e4dbcc760
Documented OSS stream modules.
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diff
changeset
|
729 </note> |
e69e4dbcc760
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Vladimir Homutov <vl@nginx.com>
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diff
changeset
|
730 </para> |
e69e4dbcc760
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parents:
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diff
changeset
|
731 |
1450
f5b5eefc43cb
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parents:
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diff
changeset
|
732 </directive> |
f5b5eefc43cb
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parents:
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diff
changeset
|
733 |
1367
f1e14d87d833
Updated commercial docs for the upcoming release.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
734 </section> |
f1e14d87d833
Updated commercial docs for the upcoming release.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
735 |
1772
536dc1885e24
Documented the $upstream_addr variable in stream.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1744
diff
changeset
|
736 |
536dc1885e24
Documented the $upstream_addr variable in stream.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1744
diff
changeset
|
737 <section id="variables" name="Embedded Variables"> |
536dc1885e24
Documented the $upstream_addr variable in stream.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1744
diff
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|
738 |
536dc1885e24
Documented the $upstream_addr variable in stream.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1744
diff
changeset
|
739 <para> |
536dc1885e24
Documented the $upstream_addr variable in stream.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1744
diff
changeset
|
740 The <literal>ngx_stream_upstream_module</literal> module |
536dc1885e24
Documented the $upstream_addr variable in stream.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1744
diff
changeset
|
741 supports the following embedded variables: |
536dc1885e24
Documented the $upstream_addr variable in stream.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
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diff
changeset
|
742 <list type="tag"> |
536dc1885e24
Documented the $upstream_addr variable in stream.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
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diff
changeset
|
743 |
536dc1885e24
Documented the $upstream_addr variable in stream.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1744
diff
changeset
|
744 <tag-name id="var_upstream_addr"><var>$upstream_addr</var></tag-name> |
536dc1885e24
Documented the $upstream_addr variable in stream.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1744
diff
changeset
|
745 <tag-desc> |
536dc1885e24
Documented the $upstream_addr variable in stream.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1744
diff
changeset
|
746 keeps the IP address and port, |
536dc1885e24
Documented the $upstream_addr variable in stream.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1744
diff
changeset
|
747 or the path to the UNIX-domain socket of the upstream server (1.11.4). |
536dc1885e24
Documented the $upstream_addr variable in stream.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1744
diff
changeset
|
748 If several servers were contacted during proxying, |
536dc1885e24
Documented the $upstream_addr variable in stream.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1744
diff
changeset
|
749 their addresses are separated by commas, e.g. |
536dc1885e24
Documented the $upstream_addr variable in stream.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1744
diff
changeset
|
750 “<literal>192.168.1.1:12345, 192.168.1.2:12345, unix:/tmp/sock</literal>”. |
536dc1885e24
Documented the $upstream_addr variable in stream.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1744
diff
changeset
|
751 </tag-desc> |
536dc1885e24
Documented the $upstream_addr variable in stream.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1744
diff
changeset
|
752 |
1773
9c48a717e001
Documented $upstream_bytes_sent, $upstream_bytes_received in stream.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1772
diff
changeset
|
753 <tag-name id="var_upstream_bytes_sent"><var>$upstream_bytes_sent</var></tag-name> |
9c48a717e001
Documented $upstream_bytes_sent, $upstream_bytes_received in stream.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1772
diff
changeset
|
754 <tag-desc> |
9c48a717e001
Documented $upstream_bytes_sent, $upstream_bytes_received in stream.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1772
diff
changeset
|
755 number of bytes sent to an upstream server (1.11.4). |
9c48a717e001
Documented $upstream_bytes_sent, $upstream_bytes_received in stream.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1772
diff
changeset
|
756 Values from several connections |
9c48a717e001
Documented $upstream_bytes_sent, $upstream_bytes_received in stream.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1772
diff
changeset
|
757 are separated by commas like addresses in the |
9c48a717e001
Documented $upstream_bytes_sent, $upstream_bytes_received in stream.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1772
diff
changeset
|
758 <link id="var_upstream_addr">$upstream_addr</link> variable. |
9c48a717e001
Documented $upstream_bytes_sent, $upstream_bytes_received in stream.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1772
diff
changeset
|
759 </tag-desc> |
9c48a717e001
Documented $upstream_bytes_sent, $upstream_bytes_received in stream.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1772
diff
changeset
|
760 |
9c48a717e001
Documented $upstream_bytes_sent, $upstream_bytes_received in stream.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1772
diff
changeset
|
761 <tag-name id="var_upstream_bytes_received"><var>$upstream_bytes_received</var></tag-name> |
9c48a717e001
Documented $upstream_bytes_sent, $upstream_bytes_received in stream.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1772
diff
changeset
|
762 <tag-desc> |
9c48a717e001
Documented $upstream_bytes_sent, $upstream_bytes_received in stream.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1772
diff
changeset
|
763 number of bytes received from an upstream server (1.11.4). |
9c48a717e001
Documented $upstream_bytes_sent, $upstream_bytes_received in stream.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1772
diff
changeset
|
764 Values from several connections |
9c48a717e001
Documented $upstream_bytes_sent, $upstream_bytes_received in stream.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1772
diff
changeset
|
765 are separated by commas like addresses in the |
9c48a717e001
Documented $upstream_bytes_sent, $upstream_bytes_received in stream.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1772
diff
changeset
|
766 <link id="var_upstream_addr">$upstream_addr</link> variable. |
9c48a717e001
Documented $upstream_bytes_sent, $upstream_bytes_received in stream.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1772
diff
changeset
|
767 </tag-desc> |
9c48a717e001
Documented $upstream_bytes_sent, $upstream_bytes_received in stream.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1772
diff
changeset
|
768 |
1774
e1e0c5b27515
Documented $upstream_connect_time, $upstream_first_byte_time, $upstream_session_time.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1773
diff
changeset
|
769 <tag-name id="var_upstream_connect_time"><var>$upstream_connect_time</var></tag-name> |
e1e0c5b27515
Documented $upstream_connect_time, $upstream_first_byte_time, $upstream_session_time.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1773
diff
changeset
|
770 <tag-desc> |
e1e0c5b27515
Documented $upstream_connect_time, $upstream_first_byte_time, $upstream_session_time.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1773
diff
changeset
|
771 time to connect to the upstream server (1.11.4); |
e1e0c5b27515
Documented $upstream_connect_time, $upstream_first_byte_time, $upstream_session_time.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1773
diff
changeset
|
772 the time is kept in seconds with millisecond resolution. |
e1e0c5b27515
Documented $upstream_connect_time, $upstream_first_byte_time, $upstream_session_time.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1773
diff
changeset
|
773 Times of several connections |
e1e0c5b27515
Documented $upstream_connect_time, $upstream_first_byte_time, $upstream_session_time.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1773
diff
changeset
|
774 are separated by commas like addresses in the |
e1e0c5b27515
Documented $upstream_connect_time, $upstream_first_byte_time, $upstream_session_time.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1773
diff
changeset
|
775 <link id="var_upstream_addr">$upstream_addr</link> variable. |
e1e0c5b27515
Documented $upstream_connect_time, $upstream_first_byte_time, $upstream_session_time.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1773
diff
changeset
|
776 </tag-desc> |
e1e0c5b27515
Documented $upstream_connect_time, $upstream_first_byte_time, $upstream_session_time.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1773
diff
changeset
|
777 |
e1e0c5b27515
Documented $upstream_connect_time, $upstream_first_byte_time, $upstream_session_time.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1773
diff
changeset
|
778 <tag-name id="var_upstream_first_byte_time"><var>$upstream_first_byte_time</var></tag-name> |
e1e0c5b27515
Documented $upstream_connect_time, $upstream_first_byte_time, $upstream_session_time.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1773
diff
changeset
|
779 <tag-desc> |
e1e0c5b27515
Documented $upstream_connect_time, $upstream_first_byte_time, $upstream_session_time.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1773
diff
changeset
|
780 time to receive the first byte of data (1.11.4); |
e1e0c5b27515
Documented $upstream_connect_time, $upstream_first_byte_time, $upstream_session_time.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1773
diff
changeset
|
781 the time is kept in seconds with millisecond resolution. |
e1e0c5b27515
Documented $upstream_connect_time, $upstream_first_byte_time, $upstream_session_time.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1773
diff
changeset
|
782 Times of several connections |
e1e0c5b27515
Documented $upstream_connect_time, $upstream_first_byte_time, $upstream_session_time.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1773
diff
changeset
|
783 are separated by commas like addresses in the |
e1e0c5b27515
Documented $upstream_connect_time, $upstream_first_byte_time, $upstream_session_time.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1773
diff
changeset
|
784 <link id="var_upstream_addr">$upstream_addr</link> variable. |
e1e0c5b27515
Documented $upstream_connect_time, $upstream_first_byte_time, $upstream_session_time.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1773
diff
changeset
|
785 </tag-desc> |
e1e0c5b27515
Documented $upstream_connect_time, $upstream_first_byte_time, $upstream_session_time.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1773
diff
changeset
|
786 |
e1e0c5b27515
Documented $upstream_connect_time, $upstream_first_byte_time, $upstream_session_time.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1773
diff
changeset
|
787 <tag-name id="var_upstream_session_time"><var>$upstream_session_time</var></tag-name> |
e1e0c5b27515
Documented $upstream_connect_time, $upstream_first_byte_time, $upstream_session_time.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1773
diff
changeset
|
788 <tag-desc> |
e1e0c5b27515
Documented $upstream_connect_time, $upstream_first_byte_time, $upstream_session_time.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1773
diff
changeset
|
789 session duration in seconds with millisecond resolution (1.11.4). |
e1e0c5b27515
Documented $upstream_connect_time, $upstream_first_byte_time, $upstream_session_time.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1773
diff
changeset
|
790 Times of several connections |
e1e0c5b27515
Documented $upstream_connect_time, $upstream_first_byte_time, $upstream_session_time.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1773
diff
changeset
|
791 are separated by commas like addresses in the |
e1e0c5b27515
Documented $upstream_connect_time, $upstream_first_byte_time, $upstream_session_time.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1773
diff
changeset
|
792 <link id="var_upstream_addr">$upstream_addr</link> variable. |
e1e0c5b27515
Documented $upstream_connect_time, $upstream_first_byte_time, $upstream_session_time.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1773
diff
changeset
|
793 </tag-desc> |
e1e0c5b27515
Documented $upstream_connect_time, $upstream_first_byte_time, $upstream_session_time.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1773
diff
changeset
|
794 |
1772
536dc1885e24
Documented the $upstream_addr variable in stream.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1744
diff
changeset
|
795 </list> |
536dc1885e24
Documented the $upstream_addr variable in stream.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1744
diff
changeset
|
796 </para> |
536dc1885e24
Documented the $upstream_addr variable in stream.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1744
diff
changeset
|
797 |
536dc1885e24
Documented the $upstream_addr variable in stream.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1744
diff
changeset
|
798 </section> |
536dc1885e24
Documented the $upstream_addr variable in stream.
Yaroslav Zhuravlev <yar@nginx.com>
parents:
1744
diff
changeset
|
799 |
1367
f1e14d87d833
Updated commercial docs for the upcoming release.
Ruslan Ermilov <ru@nginx.com>
parents:
diff
changeset
|
800 </module> |