Mercurial > hg > nginx-site
annotate xml/en/docs/stream/ngx_stream_zone_sync_module.xml @ 2278:f047bd9403d5
Documented the "proxy_requests" directive.
author | Yaroslav Zhuravlev <yar@nginx.com> |
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date | Mon, 19 Nov 2018 21:19:09 +0300 |
parents | 283b1e67eaa6 |
children | f4b9660316c5 |
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="3"> |
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13 |
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14 <section id="summary"> |
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15 |
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16 <para> |
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17 The <literal>ngx_stream_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 HTTP |
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24 <link doc="../http/ngx_http_upstream_module.xml" id="sticky">sticky</link> |
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25 sessions, information about |
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26 <link doc="../http/ngx_http_limit_req_module.xml">excessive HTTP requests</link>, |
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27 and key-value pairs both in |
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28 <link doc="../http/ngx_http_keyval_module.xml">http</link> |
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29 and <link doc="../stream/ngx_stream_keyval_module.xml">stream</link>. |
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30 </para> |
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31 |
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32 <para> |
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33 <note> |
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34 This module is available as part of our |
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35 <commercial_version>commercial subscription</commercial_version>. |
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36 </note> |
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37 </para> |
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38 |
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39 </section> |
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40 |
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41 |
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42 <section id="example" name="Example Configuration"> |
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43 |
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44 <para> |
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45 Minimal configuration: |
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46 <example> |
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47 http { |
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48 ... |
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49 |
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50 upstream backend { |
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51 server backend1.example.com:8080; |
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52 server backend2.example.com:8081; |
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53 |
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54 sticky learn |
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55 create=$upstream_cookie_examplecookie |
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56 lookup=$cookie_examplecookie |
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57 zone=client_sessions:1m <emphasis>sync</emphasis>; |
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58 } |
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59 |
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60 ... |
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61 } |
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62 |
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63 stream { |
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64 ... |
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65 |
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66 |
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67 server { |
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68 zone_sync; |
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69 |
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70 listen 127.0.0.1:8090; |
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71 |
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72 # cluster of 2 nodes |
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73 zone_sync_server a.example.com; |
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74 zone_sync_server b.example.com; |
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75 |
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76 } |
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77 </example> |
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78 A more complex configuration with SSL enabled |
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79 and with cluster members defined by DNS: |
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80 <example> |
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81 ... |
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82 |
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83 stream { |
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84 ... |
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85 |
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86 resolver 127.0.0.1 valid=10s; |
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87 |
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88 server { |
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89 zone_sync; |
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90 |
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91 # the name resolves to multiple addresses that correspond to cluster nodes |
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92 zone_sync_server cluster.example.com resolve; |
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93 |
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94 listen 127.0.0.1:4433 ssl; |
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95 |
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96 ssl_certificate localhost.crt; |
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97 ssl_certificate_key localhost.key; |
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98 |
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99 zone_sync_ssl on; |
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100 |
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101 zone_sync_ssl_certificate localhost.crt; |
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102 zone_sync_ssl_certificate_key localhost.key; |
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103 } |
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104 } |
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105 </example> |
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106 </para> |
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107 |
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108 </section> |
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109 |
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110 |
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111 <section id="directives" name="Directives"> |
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112 |
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113 <directive name="zone_sync"> |
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114 <syntax></syntax> |
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115 <default></default> |
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116 <context>server</context> |
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117 |
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118 <para> |
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119 Enables the synchronization of shared memory zones between cluster nodes. |
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120 Cluster nodes are defined using <link id="zone_sync_server"/> directives. |
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121 </para> |
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122 |
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123 </directive> |
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124 |
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125 |
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126 <directive name="zone_sync_buffers"> |
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127 <syntax><value>number</value> <value>size</value></syntax> |
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128 <default>256 4k|8k</default> |
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129 <context>stream</context> |
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130 <context>server</context> |
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131 |
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132 <para> |
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133 Sets the <value>number</value> and <value>size</value> of the |
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134 per-zone buffers used for pushing zone contents. |
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135 By default, the buffer size is equal to one memory page. |
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136 This is either 4K or 8K, depending on a platform. |
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137 </para> |
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138 |
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139 </directive> |
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140 |
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141 |
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142 <directive name="zone_sync_connect_retry_interval"> |
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143 <syntax><value>time</value></syntax> |
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144 <default>1s</default> |
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145 <context>stream</context> |
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146 <context>server</context> |
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147 |
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148 <para> |
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149 Defines an interval between connection attempts to another cluster node. |
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150 </para> |
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151 |
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152 </directive> |
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153 |
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154 |
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155 <directive name="zone_sync_connect_timeout"> |
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156 <syntax><value>time</value></syntax> |
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157 <default>5s</default> |
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158 <context>stream</context> |
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159 <context>server</context> |
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160 |
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161 <para> |
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162 Defines a timeout for establishing a connection with another cluster node. |
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163 </para> |
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164 |
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165 </directive> |
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166 |
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167 |
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168 <directive name="zone_sync_interval"> |
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169 <syntax><value>time</value></syntax> |
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170 <default>1s</default> |
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171 <context>stream</context> |
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172 <context>server</context> |
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173 |
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174 <para> |
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175 Defines an interval for polling updates in a shared memory zone. |
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176 </para> |
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177 |
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178 </directive> |
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179 |
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180 |
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181 <directive name="zone_sync_recv_buffer_size"> |
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182 <syntax><value>size</value></syntax> |
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183 <default>4k|8k</default> |
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184 <context>stream</context> |
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185 <context>server</context> |
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186 |
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187 <para> |
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188 Sets <value>size</value> of a per-connection receive buffer used to parse |
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189 incoming stream of synchronization messages. |
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190 By default, the buffer size is equal to one memory page. |
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191 This is either 4K or 8K, depending on a platform. |
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192 </para> |
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193 |
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194 </directive> |
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195 |
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196 |
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197 <directive name="zone_sync_server"> |
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198 <syntax><value>address</value> [<literal>resolve</literal>]</syntax> |
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199 <default></default> |
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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 the <value>address</value> of a cluster node. |
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204 The address can be specified as a domain name or IP address |
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205 with a mandatory port, or as a UNIX-domain socket path |
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206 specified after the “<literal>unix:</literal>” prefix. |
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207 A domain name that resolves to several IP addresses defines |
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208 multiple nodes at once. |
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209 </para> |
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210 |
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211 <para> |
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212 The <literal>resolve</literal> parameter instructs nginx to monitor |
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213 changes of the IP addresses that correspond to a domain name of the node |
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214 and automatically modify the configuration |
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215 without the need of restarting nginx. |
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216 </para> |
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217 |
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218 <para> |
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219 Cluster nodes are specified either dynamically as a single |
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220 <literal>zone_sync_server</literal> directive with |
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221 the <literal>resolve</literal> parameter, or statically as a series of several |
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222 directives without the parameter. |
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223 <note> |
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224 Each cluster node should be specified only once. |
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225 </note> |
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226 <note> |
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227 All cluster nodes should use the same configuration. |
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228 </note> |
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229 </para> |
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230 |
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231 <para> |
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232 In order for the <literal>resolve</literal> 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 server { |
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242 zone_sync; |
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243 zone_sync_server cluster.example.com resolve; |
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244 ... |
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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 |
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250 </directive> |
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251 |
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252 |
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253 <directive name="zone_sync_ssl"> |
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254 <syntax><literal>on</literal> | <literal>off</literal></syntax> |
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255 <default>off</default> |
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256 <context>stream</context> |
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257 <context>server</context> |
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258 |
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259 <para> |
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260 Enables the SSL/TLS protocol for connections to another cluster server. |
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261 </para> |
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262 |
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263 </directive> |
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264 |
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265 |
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266 <directive name="zone_sync_ssl_certificate"> |
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267 <syntax><value>file</value></syntax> |
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268 <default/> |
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269 <context>stream</context> |
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270 <context>server</context> |
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271 |
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272 <para> |
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273 Specifies a <value>file</value> with the certificate in the PEM format |
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274 used for authentication to another cluster server. |
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275 </para> |
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276 |
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277 </directive> |
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278 |
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279 |
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280 <directive name="zone_sync_ssl_certificate_key"> |
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281 <syntax><value>file</value></syntax> |
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282 <default/> |
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283 <context>stream</context> |
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284 <context>server</context> |
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285 |
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286 <para> |
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287 Specifies a <value>file</value> with the secret key in the PEM format |
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288 used for authentication to another cluster server. |
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289 </para> |
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290 |
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291 </directive> |
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292 |
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293 |
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294 <directive name="zone_sync_ssl_ciphers"> |
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295 <syntax><value>ciphers</value></syntax> |
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296 <default>DEFAULT</default> |
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297 <context>stream</context> |
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298 <context>server</context> |
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299 |
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300 <para> |
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301 Specifies the enabled ciphers for connections to another cluster server. |
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302 The ciphers are specified in the format understood by the OpenSSL library. |
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303 </para> |
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304 |
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305 <para> |
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306 The full list can be viewed using the |
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307 “<command>openssl ciphers</command>” command. |
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308 </para> |
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309 |
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310 </directive> |
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311 |
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312 |
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313 <directive name="zone_sync_ssl_crl"> |
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314 <syntax><value>file</value></syntax> |
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315 <default/> |
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316 <context>stream</context> |
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317 <context>server</context> |
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318 |
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319 <para> |
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320 Specifies a <value>file</value> with revoked certificates (CRL) |
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321 in the PEM format used to <link id="zone_sync_ssl_verify">verify</link> |
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322 the certificate of another cluster server. |
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323 </para> |
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324 |
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325 </directive> |
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326 |
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327 |
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328 <directive name="zone_sync_ssl_password_file"> |
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329 <syntax><value>file</value></syntax> |
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330 <default/> |
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331 <context>stream</context> |
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332 <context>server</context> |
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333 |
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334 <para> |
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335 Specifies a <value>file</value> with passphrases for |
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336 <link id="zone_sync_ssl_certificate_key">secret keys</link> |
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337 where each passphrase is specified on a separate line. |
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338 Passphrases are tried in turn when loading the key. |
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339 </para> |
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340 |
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341 </directive> |
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342 |
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343 |
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344 <directive name="zone_sync_ssl_protocols"> |
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345 <syntax> |
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346 [<literal>SSLv2</literal>] |
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347 [<literal>SSLv3</literal>] |
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348 [<literal>TLSv1</literal>] |
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349 [<literal>TLSv1.1</literal>] |
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350 [<literal>TLSv1.2</literal>] |
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351 [<literal>TLSv1.3</literal>]</syntax> |
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352 <default>TLSv1 TLSv1.1 TLSv1.2</default> |
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353 <context>stream</context> |
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354 <context>server</context> |
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355 |
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356 <para> |
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357 Enables the specified protocols for connections to another cluster server. |
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358 </para> |
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359 |
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360 </directive> |
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361 |
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362 |
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363 <directive name="zone_sync_ssl_trusted_certificate"> |
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364 <syntax><value>file</value></syntax> |
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365 <default/> |
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366 <context>stream</context> |
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367 <context>server</context> |
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368 |
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369 <para> |
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370 Specifies a <value>file</value> with trusted CA certificates in the PEM format |
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371 used to <link id="zone_sync_ssl_verify">verify</link> |
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372 the certificate of another cluster server. |
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373 </para> |
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374 |
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375 </directive> |
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376 |
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377 |
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378 <directive name="zone_sync_ssl_verify"> |
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379 <syntax><literal>on</literal> | <literal>off</literal></syntax> |
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380 <default>off</default> |
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381 <context>stream</context> |
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382 <context>server</context> |
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383 |
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384 <para> |
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385 Enables or disables verification of another cluster server certificate. |
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386 </para> |
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387 |
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388 </directive> |
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389 |
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390 |
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391 <directive name="zone_sync_ssl_verify_depth"> |
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392 <syntax><value>number</value></syntax> |
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393 <default>1</default> |
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394 <context>stream</context> |
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395 <context>server</context> |
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396 |
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397 <para> |
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398 Sets the verification depth in another cluster server certificates chain. |
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399 </para> |
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400 |
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401 </directive> |
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402 |
2142
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403 |
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404 <directive name="zone_sync_timeout"> |
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405 <syntax><value>timeout</value></syntax> |
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406 <default>5s</default> |
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407 <context>stream</context> |
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408 <context>server</context> |
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409 |
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410 <para> |
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411 Sets the <value>timeout</value> between two successive |
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412 read or write operations on connection to another cluster node. |
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413 If no data is transmitted within this time, the connection is closed. |
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414 </para> |
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415 |
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416 </directive> |
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417 |
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418 </section> |
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419 |
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420 |
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421 <section id="stream_zone_sync_status" name="API endpoints"> |
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422 <para> |
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423 The synchronization status of a node is available via the |
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424 <link doc= "../http/ngx_http_api_module.xml" id="stream_zone_sync_">/stream/zone_sync/</link> |
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425 endpoint of the API which returns the |
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426 <link doc= "../http/ngx_http_api_module.xml" id="def_nginx_stream_zone_sync">following</link> |
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427 metrics. |
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428 </para> |
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429 |
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430 </section> |
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431 |
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432 |
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433 <section id="controlling_cluster_node" name="Starting, stopping, removing a cluster node"> |
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434 <para> |
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435 To start a new node, update a DNS record of a cluster hostname |
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436 with the IP address of the new node and start an instance. |
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437 The new node will discover other nodes from DNS or static configuration |
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438 and will start sending updates to them. |
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439 Other nodes will eventually discover the new node using DNS and |
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440 start pushing updates to it. |
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441 In case of static configuration, |
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442 other nodes need to be reloaded in order to send updates to the new node. |
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443 </para> |
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444 |
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445 <para> |
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446 To stop a node, send the <literal>QUIT</literal> signal to the instance. |
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447 The node will finish zone synchronization |
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448 and gracefully close open connections. |
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449 </para> |
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450 |
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451 <para> |
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452 To remove a node, update a DNS record of a cluster hostname |
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453 and remove the IP address of the node. |
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454 All other nodes will eventually discover that the node is removed, |
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455 close connections to the node, and will no longer try to connect to it. |
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456 After the node is removed, it can be stopped as described above. |
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457 In case of static configuration, other nodes need to be reloaded |
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458 in order to stop sending updates to the removed node. |
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459 </para> |
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460 |
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461 </section> |
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462 |
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463 </module> |