annotate xml/en/docs/stream/ngx_stream_zone_sync_module.xml @ 2140:acef9537383c

Fixed allowed "zone_sync" and "zone_sync_server" contexts.
author Ruslan Ermilov <ru@nginx.com>
date Mon, 09 Apr 2018 14:29:06 +0300
parents f6e578b1b02d
children ca7568f67dee
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
2139
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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_zone_sync_module"
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10 link="/en/docs/stream/ngx_stream_zone_sync_module.html"
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11 lang="en"
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12 rev="1">
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13
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14 <section id="summary">
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15
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16 <para>
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17 The <literal>ngx_stream_zone_sync_module</literal> module (1.13.8)
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18 provides the necessary support for synchronizing contents of
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19 <link doc="ngx_stream_upstream_module.xml" id="zone">shared memory zones</link>
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20 between nodes of a cluster.
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21 To enable synchronization for a particular zone, a corresponding module
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22 must support this feature.
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23 Currently, it is possible to synchronize
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24 <link doc="../http/ngx_http_upstream_module.xml" id="sticky">sticky</link>
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25 sessions.
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26 </para>
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27 </section>
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28
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29
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30 <section id="example" name="Example Configuration">
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31
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32 <para>
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33 Minimal configuration:
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34 <example>
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35 http {
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36 ...
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37
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38 upstream backend {
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39 server backend1.example.com:8080;
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40 server backend2.example.com:8081;
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41
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42 sticky learn
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43 create=$upstream_cookie_examplecookie
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44 lookup=$cookie_examplecookie
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45 zone=client_sessions:1m <emphasis>sync</emphasis>;
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46 }
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47
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48 ...
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49 }
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50
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51 stream {
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52 ...
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53
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54
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55 server {
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56 zone_sync;
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57
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58 listen 127.0.0.1:8090;
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59
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60 # cluster of 2 nodes: each name resolves to a single IP address
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61 zone_sync_server a.example.com;
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62 zone_sync_server b.example.com;
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63
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64 }
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65 </example>
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66 A more complex configuration with SSL enabled
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67 and with cluster members defined by DNS:
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68 <example>
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69 ...
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70
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71 stream {
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72 ...
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73
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74 resolver 127.0.0.1 valid=10s;
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75
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76 server {
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77 zone_sync;
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78
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79 # the name resolves to multiple addresses that correspond to cluster nodes
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80 zone_sync_server cluster.example.com resolve;
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81
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82 listen 127.0.0.1:4433 ssl;
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83
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84 ssl_certificate localhost.crt;
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85 ssl_certificate_key localhost.key;
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86
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87 zone_sync_ssl on;
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88
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89 zone_sync_ssl_certificate localhost.crt;
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90 zone_sync_ssl_certificate_key localhost.key;
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91 }
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92 }
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93 </example>
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94 </para>
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95
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96 </section>
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97
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98
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99 <section id="directives" name="Directives">
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100
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101 <directive name="zone_sync">
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102 <syntax></syntax>
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103 <default></default>
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104 <context>server</context>
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105
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106 <para>
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107 Enables the synchronization of shared memory zones between cluster nodes.
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108 Cluster nodes are defined using <link id="zone_sync_server"/> directives.
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109 </para>
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110
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111 </directive>
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112
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113
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114 <directive name="zone_sync_server">
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115 <syntax><value>address</value> [<literal>resolve</literal>]</syntax>
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116 <default></default>
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117 <context>server</context>
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118
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119 <para>
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120 Defines the <value>address</value> of a cluster node
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121 and an optional method of resolving it.
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122 The address can be specified as a domain name or IP address
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123 with a mandatory port, or as a UNIX-domain socket path
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124 specified after the “<literal>unix:</literal>” prefix.
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125 A domain name that resolves to several IP addresses defines
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126 multiple servers at once.
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127 </para>
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128
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129 <para>
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130 The "<literal>resolve</literal>" parameter makes nginx to
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131 monitor changes of the IP addresses
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132 that correspond to a domain name of the server
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133 and automatically modifies the configuration
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134 without the need of restarting nginx.
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135 </para>
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136
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137 <para>
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138 In order for this parameter to work,
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139 the <link doc="ngx_stream_core_module.xml" id="resolver"/> directive
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140 must be specified in the
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141 <link doc="ngx_stream_core_module.xml" id="stream"/> block.
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142 Example:
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143 <example>
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144 stream {
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145 resolver 10.0.0.1;
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146
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147 server {
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148 zone_sync;
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149 ...
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150 zone_sync_server example.com resolve;
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151 }
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152 }
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153 </example>
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154 </para>
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155
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156 <para>
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157 <note>
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158 Each cluster node must be specified only once.
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159 If using domain names, ensure they are resolvable to a single IP address.
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160 </note>
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161 <note>
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162 The own address of a node is ignored, thus, there is no need to have different
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163 configurations on different nodes.
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164 </note>
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165 </para>
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166
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167 </directive>
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168
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169
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170 <directive name="zone_sync_interval">
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171 <syntax><value>time</value></syntax>
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172 <default>1s</default>
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173 <context>stream</context>
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174 <context>server</context>
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175
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176 <para>
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177 Defines an interval for polling updates in a shared memory zone.
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178 </para>
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179
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180 </directive>
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181
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182
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183 <directive name="zone_sync_connect_timeout">
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184 <syntax><value>time</value></syntax>
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185 <default>5s</default>
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186 <context>stream</context>
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187 <context>server</context>
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188
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189 <para>
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190 Defines a timeout for establishing a connection with another cluster node.
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191 </para>
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192
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193 </directive>
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194
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195
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196 <directive name="zone_sync_connect_retry_interval">
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197 <syntax><value>time</value></syntax>
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198 <default>1s</default>
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199 <context>stream</context>
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200 <context>server</context>
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201
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202 <para>
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203 Defines an interval between connection attempts to another cluster node.
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204 </para>
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205
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206 </directive>
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207
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208
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209 <directive name="zone_sync_timeout">
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210 <syntax><value>timeout</value></syntax>
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211 <default>5s</default>
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212 <context>stream</context>
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213 <context>server</context>
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214
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215 <para>
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216 Sets the <value>timeout</value> between two successive
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217 read or write operations on connection to another cluster node.
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218 If no data is transmitted within this time, the connection is closed.
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219 </para>
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220
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221 </directive>
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222
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223
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224 <directive name="zone_sync_buffers">
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225 <syntax><value>number</value> <value>size</value></syntax>
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226 <default>256 4k|8k</default>
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227 <context>stream</context>
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228 <context>server</context>
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229
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230 <para>
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231 Sets the <value>number</value> and <value>size</value> of the
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232 per-zone buffers used for pushing zone contents.
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233 By default, the buffer size is equal to one memory page.
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234 This is either 4K or 8K, depending on a platform.
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235 </para>
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236
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237 </directive>
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238
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239
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240 <directive name="zone_sync_recv_buffer_size">
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241 <syntax><value>size</value></syntax>
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242 <default>4k|8k</default>
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243 <context>stream</context>
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244 <context>server</context>
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245
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246 <para>
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247 Sets <value>size</value> of a per-connection receive buffer used to parse
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248 incoming stream of synchronization messages.
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249 By default, the buffer size is equal to one memory page.
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250 This is either 4K or 8K, depending on a platform.
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251 </para>
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252
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253 </directive>
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254
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255
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256 <directive name="zone_sync_ssl">
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257 <syntax><literal>on</literal> | <literal>off</literal></syntax>
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258 <default>off</default>
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259 <context>stream</context>
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260 <context>server</context>
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261
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262 <para>
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263 Enables the SSL/TLS protocol for connections to another cluster server.
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264 </para>
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265
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266 </directive>
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267
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268
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269 <directive name="zone_sync_ssl_certificate">
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270 <syntax><value>file</value></syntax>
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271 <default/>
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272 <context>stream</context>
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273 <context>server</context>
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274
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275 <para>
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276 Specifies a <value>file</value> with the certificate in the PEM format
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277 used for authentication to another cluster server.
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278 </para>
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279
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280 </directive>
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281
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282
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283 <directive name="zone_sync_ssl_certificate_key">
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284 <syntax><value>file</value></syntax>
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285 <default/>
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286 <context>stream</context>
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diff changeset
287 <context>server</context>
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288
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289 <para>
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290 Specifies a <value>file</value> with the secret key in the PEM format
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291 used for authentication to another cluster server.
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292 </para>
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293
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294 </directive>
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diff changeset
295
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diff changeset
296
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297 <directive name="zone_sync_ssl_ciphers">
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298 <syntax><value>ciphers</value></syntax>
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diff changeset
299 <default>DEFAULT</default>
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diff changeset
300 <context>stream</context>
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diff changeset
301 <context>server</context>
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diff changeset
302
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303 <para>
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304 Specifies the enabled ciphers for connections to another cluster server.
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305 The ciphers are specified in the format understood by the OpenSSL library.
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306 </para>
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307
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308 <para>
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309 The full list can be viewed using the
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310 “<command>openssl ciphers</command>” command.
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311 </para>
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312
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313 </directive>
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314
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Ruslan Ermilov <ru@nginx.com>
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diff changeset
315
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diff changeset
316 <directive name="zone_sync_ssl_crl">
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317 <syntax><value>file</value></syntax>
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318 <default/>
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319 <context>stream</context>
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diff changeset
320 <context>server</context>
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diff changeset
321
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322 <para>
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323 Specifies a <value>file</value> with revoked certificates (CRL)
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parents:
diff changeset
324 in the PEM format used to <link id="zone_sync_ssl_verify">verify</link>
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diff changeset
325 the certificate of another cluster server.
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parents:
diff changeset
326 </para>
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parents:
diff changeset
327
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
328 </directive>
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
329
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
330
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
331 <directive name="zone_sync_ssl_password_file">
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parents:
diff changeset
332 <syntax><value>file</value></syntax>
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
333 <default/>
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
334 <context>stream</context>
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
335 <context>server</context>
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
336
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diff changeset
337 <para>
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338 Specifies a <value>file</value> with passphrases for
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parents:
diff changeset
339 <link id="zone_sync_ssl_certificate_key">secret keys</link>
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parents:
diff changeset
340 where each passphrase is specified on a separate line.
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
341 Passphrases are tried in turn when loading the key.
f6e578b1b02d Updated docs for the upcoming NGINX Plus release.
Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
342 </para>
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
343
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
344 </directive>
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
345
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
346
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
347 <directive name="zone_sync_ssl_protocols">
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parents:
diff changeset
348 <syntax>
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Ruslan Ermilov <ru@nginx.com>
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diff changeset
349 [<literal>SSLv2</literal>]
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Ruslan Ermilov <ru@nginx.com>
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diff changeset
350 [<literal>SSLv3</literal>]
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Ruslan Ermilov <ru@nginx.com>
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diff changeset
351 [<literal>TLSv1</literal>]
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
352 [<literal>TLSv1.1</literal>]
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
353 [<literal>TLSv1.2</literal>]
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
354 [<literal>TLSv1.3</literal>]</syntax>
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parents:
diff changeset
355 <default>TLSv1 TLSv1.1 TLSv1.2</default>
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parents:
diff changeset
356 <context>stream</context>
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
357 <context>server</context>
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parents:
diff changeset
358
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
359 <para>
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
360 Enables the specified protocols for connections to another cluster server.
f6e578b1b02d Updated docs for the upcoming NGINX Plus release.
Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
361 </para>
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
362
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
363 </directive>
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
364
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
365
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
366 <directive name="zone_sync_ssl_trusted_certificate">
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
367 <syntax><value>file</value></syntax>
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
368 <default/>
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
369 <context>stream</context>
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
370 <context>server</context>
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
371
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
372 <para>
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parents:
diff changeset
373 Specifies a <value>file</value> with trusted CA certificates in the PEM format
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parents:
diff changeset
374 used to <link id="zone_sync_ssl_verify">verify</link>
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parents:
diff changeset
375 the certificate of another cluster server.
f6e578b1b02d Updated docs for the upcoming NGINX Plus release.
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parents:
diff changeset
376 </para>
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
377
f6e578b1b02d Updated docs for the upcoming NGINX Plus release.
Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
378 </directive>
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
379
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
380
f6e578b1b02d Updated docs for the upcoming NGINX Plus release.
Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
381 <directive name="zone_sync_ssl_verify">
f6e578b1b02d Updated docs for the upcoming NGINX Plus release.
Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
382 <syntax><literal>on</literal> | <literal>off</literal></syntax>
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
383 <default>off</default>
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
384 <context>stream</context>
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
385 <context>server</context>
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
386
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
387 <para>
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
388 Enables or disables verification of another cluster server certificate.
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
389 </para>
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
390
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
391 </directive>
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
392
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
393
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
394 <directive name="zone_sync_ssl_verify_depth">
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
395 <syntax><value>number</value></syntax>
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
396 <default>1</default>
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
397 <context>stream</context>
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
398 <context>server</context>
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
399
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
400 <para>
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
401 Sets the verification depth in another cluster server certificates chain.
f6e578b1b02d Updated docs for the upcoming NGINX Plus release.
Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
402 </para>
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
403
f6e578b1b02d Updated docs for the upcoming NGINX Plus release.
Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
404 </directive>
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
405
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
406 </section>
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
407
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
408
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
409 <section id="stream_zone_sync_status" name="API endpoints">
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
410 <para>
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
411 The synchronization status of a node is available via the
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
412 <link doc= "../http/ngx_http_api_module.xml" id="stream_zone_sync_">/stream/zone_sync/</link>
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parents:
diff changeset
413 endpoint of the API which returns the
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
414 <link doc= "../http/ngx_http_api_module.xml" id="def_nginx_stream_zone_sync">following</link>
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
415 metrics.
f6e578b1b02d Updated docs for the upcoming NGINX Plus release.
Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
416 </para>
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
417
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
418 </section>
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
419
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
420
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
421 <section id="controlling_cluster_node" name="Starting, stopping, removing a cluster node">
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
422 <para>
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Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
423 To start a new node, update a DNS record of a cluster hostname
f6e578b1b02d Updated docs for the upcoming NGINX Plus release.
Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
424 with the IP address of the new node and start an instance.
f6e578b1b02d Updated docs for the upcoming NGINX Plus release.
Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
425 The new node will discover other nodes from DNS or static configuration
f6e578b1b02d Updated docs for the upcoming NGINX Plus release.
Ruslan Ermilov <ru@nginx.com>
parents:
diff changeset
426 and will start sending updates to them.
f6e578b1b02d Updated docs for the upcoming NGINX Plus release.
Ruslan Ermilov <ru@nginx.com>
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427 Other nodes will eventually discover the new node using DNS and
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428 start pushing updates to it.
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429 In case of static configuration,
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430 other nodes need to be reloaded in order to send updates to the new node.
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431 </para>
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432
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433 <para>
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434 To stop a node, send the <literal>QUIT</literal> signal to the instance.
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435 The node will finish zone synchronization
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436 and gracefully close open connections.
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437 </para>
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438
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439 <para>
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440 To remove a node, update a DNS record of a cluster hostname
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441 and remove the IP address of the node.
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442 All other nodes will eventually discover that the node is removed,
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443 close connections to the node, and will no longer try to connect to it.
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444 After the node is removed, it can be stopped as described above.
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445 In case of static configuration, other nodes need to be reloaded
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446 in order to stop sending updates to the removed node.
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447 </para>
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448
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449 </section>
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450
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451 </module>