Mercurial > hg > nginx-site
annotate xml/en/docs/stream/ngx_stream_zone_sync_module.xml @ 2145:5a31c6b83cbc
Corrected appeared-in version for the zone_sync module.
author | Yaroslav Zhuravlev <yar@nginx.com> |
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date | Wed, 11 Apr 2018 15:11:12 +0300 |
parents | ca7568f67dee |
children | ed6b44206600 |
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_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="2"> |
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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 (1.13.10) |
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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 |
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28 <para> |
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29 <note> |
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30 This module is available as part of our |
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31 <commercial_version>commercial subscription</commercial_version>. |
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32 </note> |
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33 </para> |
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34 |
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35 </section> |
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36 |
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37 |
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38 <section id="example" name="Example Configuration"> |
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39 |
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40 <para> |
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41 Minimal configuration: |
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42 <example> |
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43 http { |
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44 ... |
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45 |
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46 upstream backend { |
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47 server backend1.example.com:8080; |
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48 server backend2.example.com:8081; |
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49 |
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50 sticky learn |
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51 create=$upstream_cookie_examplecookie |
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52 lookup=$cookie_examplecookie |
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53 zone=client_sessions:1m <emphasis>sync</emphasis>; |
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54 } |
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55 |
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56 ... |
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57 } |
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58 |
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59 stream { |
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60 ... |
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61 |
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62 |
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63 server { |
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64 zone_sync; |
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65 |
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66 listen 127.0.0.1:8090; |
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67 |
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68 # cluster of 2 nodes: each name resolves to a single IP address |
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69 zone_sync_server a.example.com; |
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70 zone_sync_server b.example.com; |
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71 |
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72 } |
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73 </example> |
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74 A more complex configuration with SSL enabled |
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75 and with cluster members defined by DNS: |
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76 <example> |
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77 ... |
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78 |
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79 stream { |
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80 ... |
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81 |
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82 resolver 127.0.0.1 valid=10s; |
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83 |
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84 server { |
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85 zone_sync; |
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86 |
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87 # the name resolves to multiple addresses that correspond to cluster nodes |
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88 zone_sync_server cluster.example.com resolve; |
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89 |
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90 listen 127.0.0.1:4433 ssl; |
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91 |
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92 ssl_certificate localhost.crt; |
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93 ssl_certificate_key localhost.key; |
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94 |
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95 zone_sync_ssl on; |
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96 |
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97 zone_sync_ssl_certificate localhost.crt; |
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98 zone_sync_ssl_certificate_key localhost.key; |
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99 } |
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100 } |
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101 </example> |
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102 </para> |
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103 |
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104 </section> |
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105 |
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106 |
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107 <section id="directives" name="Directives"> |
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108 |
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109 <directive name="zone_sync"> |
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110 <syntax></syntax> |
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111 <default></default> |
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112 <context>server</context> |
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113 |
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114 <para> |
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115 Enables the synchronization of shared memory zones between cluster nodes. |
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116 Cluster nodes are defined using <link id="zone_sync_server"/> directives. |
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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="zone_sync_buffers"> |
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123 <syntax><value>number</value> <value>size</value></syntax> |
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124 <default>256 4k|8k</default> |
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125 <context>stream</context> |
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126 <context>server</context> |
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127 |
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128 <para> |
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129 Sets the <value>number</value> and <value>size</value> of the |
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130 per-zone buffers used for pushing zone contents. |
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131 By default, the buffer size is equal to one memory page. |
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132 This is either 4K or 8K, depending on a platform. |
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133 </para> |
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134 |
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135 </directive> |
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136 |
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137 |
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138 <directive name="zone_sync_connect_retry_interval"> |
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139 <syntax><value>time</value></syntax> |
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140 <default>1s</default> |
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141 <context>stream</context> |
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142 <context>server</context> |
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143 |
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144 <para> |
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145 Defines an interval between connection attempts to another cluster node. |
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146 </para> |
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147 |
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148 </directive> |
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149 |
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150 |
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151 <directive name="zone_sync_connect_timeout"> |
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152 <syntax><value>time</value></syntax> |
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153 <default>5s</default> |
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154 <context>stream</context> |
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155 <context>server</context> |
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156 |
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157 <para> |
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158 Defines a timeout for establishing a connection with another cluster node. |
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159 </para> |
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160 |
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161 </directive> |
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162 |
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163 |
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164 <directive name="zone_sync_interval"> |
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165 <syntax><value>time</value></syntax> |
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166 <default>1s</default> |
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167 <context>stream</context> |
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168 <context>server</context> |
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169 |
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170 <para> |
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171 Defines an interval for polling updates in a shared memory zone. |
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172 </para> |
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173 |
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174 </directive> |
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175 |
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176 |
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177 <directive name="zone_sync_recv_buffer_size"> |
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178 <syntax><value>size</value></syntax> |
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179 <default>4k|8k</default> |
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180 <context>stream</context> |
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181 <context>server</context> |
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182 |
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183 <para> |
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184 Sets <value>size</value> of a per-connection receive buffer used to parse |
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185 incoming stream of synchronization messages. |
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186 By default, the buffer size is equal to one memory page. |
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187 This is either 4K or 8K, depending on a platform. |
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188 </para> |
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189 |
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190 </directive> |
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191 |
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192 |
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193 <directive name="zone_sync_server"> |
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194 <syntax><value>address</value> [<literal>resolve</literal>]</syntax> |
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195 <default></default> |
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196 <context>server</context> |
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197 |
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198 <para> |
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199 Defines the <value>address</value> of a cluster node |
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200 and an optional method of resolving it. |
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201 The address can be specified as a domain name or IP address |
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202 with a mandatory port, or as a UNIX-domain socket path |
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203 specified after the “<literal>unix:</literal>” prefix. |
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204 A domain name that resolves to several IP addresses defines |
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205 multiple servers at once. |
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206 </para> |
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207 |
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208 <para> |
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209 The "<literal>resolve</literal>" parameter makes nginx to |
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210 monitor changes of the IP addresses |
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211 that correspond to a domain name of the server |
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212 and automatically modifies the configuration |
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213 without the need of restarting nginx. |
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214 </para> |
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215 |
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216 <para> |
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217 In order for this parameter to work, |
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218 the <link doc="ngx_stream_core_module.xml" id="resolver"/> directive |
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219 must be specified in the |
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220 <link doc="ngx_stream_core_module.xml" id="stream"/> block. |
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221 Example: |
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222 <example> |
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223 stream { |
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224 resolver 10.0.0.1; |
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225 |
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226 server { |
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227 zone_sync; |
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228 ... |
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229 zone_sync_server example.com resolve; |
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230 } |
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231 } |
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232 </example> |
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233 </para> |
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234 |
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235 <para> |
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236 <note> |
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237 Each cluster node must be specified only once. |
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238 If using domain names, ensure they are resolvable to a single IP address. |
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239 </note> |
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240 <note> |
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241 The own address of a node is ignored, thus, there is no need to have different |
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242 configurations on different nodes. |
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243 </note> |
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244 </para> |
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245 |
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246 </directive> |
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247 |
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248 |
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249 <directive name="zone_sync_ssl"> |
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250 <syntax><literal>on</literal> | <literal>off</literal></syntax> |
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251 <default>off</default> |
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252 <context>stream</context> |
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253 <context>server</context> |
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254 |
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255 <para> |
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256 Enables the SSL/TLS protocol for connections to another cluster server. |
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257 </para> |
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258 |
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259 </directive> |
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260 |
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261 |
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262 <directive name="zone_sync_ssl_certificate"> |
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263 <syntax><value>file</value></syntax> |
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264 <default/> |
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265 <context>stream</context> |
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266 <context>server</context> |
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267 |
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268 <para> |
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269 Specifies a <value>file</value> with the certificate in the PEM format |
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270 used for authentication to another cluster server. |
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271 </para> |
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272 |
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273 </directive> |
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274 |
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275 |
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276 <directive name="zone_sync_ssl_certificate_key"> |
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277 <syntax><value>file</value></syntax> |
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278 <default/> |
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279 <context>stream</context> |
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280 <context>server</context> |
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281 |
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282 <para> |
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283 Specifies a <value>file</value> with the secret key in the PEM format |
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284 used for authentication to another cluster server. |
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285 </para> |
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286 |
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287 </directive> |
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288 |
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289 |
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290 <directive name="zone_sync_ssl_ciphers"> |
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291 <syntax><value>ciphers</value></syntax> |
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292 <default>DEFAULT</default> |
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293 <context>stream</context> |
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294 <context>server</context> |
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295 |
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296 <para> |
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297 Specifies the enabled ciphers for connections to another cluster server. |
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298 The ciphers are specified in the format understood by the OpenSSL library. |
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299 </para> |
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300 |
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301 <para> |
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302 The full list can be viewed using the |
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303 “<command>openssl ciphers</command>” command. |
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304 </para> |
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305 |
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306 </directive> |
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307 |
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308 |
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309 <directive name="zone_sync_ssl_crl"> |
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310 <syntax><value>file</value></syntax> |
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311 <default/> |
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312 <context>stream</context> |
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313 <context>server</context> |
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314 |
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315 <para> |
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316 Specifies a <value>file</value> with revoked certificates (CRL) |
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317 in the PEM format used to <link id="zone_sync_ssl_verify">verify</link> |
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318 the certificate of another cluster server. |
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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_sync_ssl_password_file"> |
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325 <syntax><value>file</value></syntax> |
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326 <default/> |
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327 <context>stream</context> |
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328 <context>server</context> |
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329 |
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330 <para> |
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331 Specifies a <value>file</value> with passphrases for |
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332 <link id="zone_sync_ssl_certificate_key">secret keys</link> |
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333 where each passphrase is specified on a separate line. |
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334 Passphrases are tried in turn when loading the key. |
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335 </para> |
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336 |
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337 </directive> |
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338 |
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339 |
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340 <directive name="zone_sync_ssl_protocols"> |
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341 <syntax> |
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342 [<literal>SSLv2</literal>] |
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343 [<literal>SSLv3</literal>] |
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344 [<literal>TLSv1</literal>] |
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345 [<literal>TLSv1.1</literal>] |
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346 [<literal>TLSv1.2</literal>] |
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347 [<literal>TLSv1.3</literal>]</syntax> |
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348 <default>TLSv1 TLSv1.1 TLSv1.2</default> |
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349 <context>stream</context> |
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350 <context>server</context> |
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351 |
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352 <para> |
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353 Enables the specified protocols for connections to another cluster server. |
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354 </para> |
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355 |
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356 </directive> |
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357 |
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358 |
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359 <directive name="zone_sync_ssl_trusted_certificate"> |
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360 <syntax><value>file</value></syntax> |
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361 <default/> |
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362 <context>stream</context> |
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363 <context>server</context> |
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364 |
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365 <para> |
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366 Specifies a <value>file</value> with trusted CA certificates in the PEM format |
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367 used to <link id="zone_sync_ssl_verify">verify</link> |
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368 the certificate of another cluster server. |
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369 </para> |
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370 |
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371 </directive> |
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372 |
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373 |
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374 <directive name="zone_sync_ssl_verify"> |
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375 <syntax><literal>on</literal> | <literal>off</literal></syntax> |
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376 <default>off</default> |
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377 <context>stream</context> |
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378 <context>server</context> |
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379 |
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380 <para> |
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381 Enables or disables verification of another cluster server certificate. |
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382 </para> |
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383 |
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384 </directive> |
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385 |
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386 |
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387 <directive name="zone_sync_ssl_verify_depth"> |
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388 <syntax><value>number</value></syntax> |
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389 <default>1</default> |
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390 <context>stream</context> |
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391 <context>server</context> |
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392 |
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393 <para> |
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394 Sets the verification depth in another cluster server certificates chain. |
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395 </para> |
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396 |
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397 </directive> |
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398 |
2142
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399 |
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400 <directive name="zone_sync_timeout"> |
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401 <syntax><value>timeout</value></syntax> |
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402 <default>5s</default> |
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403 <context>stream</context> |
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404 <context>server</context> |
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405 |
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406 <para> |
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407 Sets the <value>timeout</value> between two successive |
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408 read or write operations on connection to another cluster node. |
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409 If no data is transmitted within this time, the connection is closed. |
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410 </para> |
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411 |
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412 </directive> |
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413 |
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414 </section> |
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415 |
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416 |
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417 <section id="stream_zone_sync_status" name="API endpoints"> |
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418 <para> |
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419 The synchronization status of a node is available via the |
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420 <link doc= "../http/ngx_http_api_module.xml" id="stream_zone_sync_">/stream/zone_sync/</link> |
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421 endpoint of the API which returns the |
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422 <link doc= "../http/ngx_http_api_module.xml" id="def_nginx_stream_zone_sync">following</link> |
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423 metrics. |
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424 </para> |
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425 |
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426 </section> |
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427 |
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428 |
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429 <section id="controlling_cluster_node" name="Starting, stopping, removing a cluster node"> |
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430 <para> |
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431 To start a new node, update a DNS record of a cluster hostname |
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432 with the IP address of the new node and start an instance. |
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433 The new node will discover other nodes from DNS or static configuration |
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434 and will start sending updates to them. |
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435 Other nodes will eventually discover the new node using DNS and |
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436 start pushing updates to it. |
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437 In case of static configuration, |
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438 other nodes need to be reloaded in order to send updates to the new node. |
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439 </para> |
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440 |
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441 <para> |
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442 To stop a node, send the <literal>QUIT</literal> signal to the instance. |
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443 The node will finish zone synchronization |
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444 and gracefully close open connections. |
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445 </para> |
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446 |
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447 <para> |
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448 To remove a node, update a DNS record of a cluster hostname |
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449 and remove the IP address of the node. |
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450 All other nodes will eventually discover that the node is removed, |
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451 close connections to the node, and will no longer try to connect to it. |
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452 After the node is removed, it can be stopped as described above. |
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453 In case of static configuration, other nodes need to be reloaded |
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454 in order to stop sending updates to the removed node. |
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455 </para> |
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456 |
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457 </section> |
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458 |
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459 </module> |