Mercurial > hg > nginx-site
annotate xml/en/docs/stream/ngx_stream_zone_sync_module.xml @ 2930:6fc4778fec28
Year 2023.
author | Yaroslav Zhuravlev <yar@nginx.com> |
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date | Mon, 30 Jan 2023 16:08:57 +0000 |
parents | 0d355d154181 |
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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="7"> |
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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 127.0.0.1:12345; |
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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:12345; |
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74 zone_sync_server b.example.com:12345; |
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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:12345 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>8 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 <para> |
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140 <note> |
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141 A single buffer must be large enough to hold any entry of each zone being |
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142 synchronized. |
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143 </note> |
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144 </para> |
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145 |
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146 </directive> |
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147 |
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148 |
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149 <directive name="zone_sync_connect_retry_interval"> |
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150 <syntax><value>time</value></syntax> |
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151 <default>1s</default> |
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152 <context>stream</context> |
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153 <context>server</context> |
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154 |
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155 <para> |
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156 Defines an interval between connection attempts to another cluster node. |
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157 </para> |
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158 |
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159 </directive> |
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160 |
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161 |
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162 <directive name="zone_sync_connect_timeout"> |
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163 <syntax><value>time</value></syntax> |
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164 <default>5s</default> |
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165 <context>stream</context> |
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166 <context>server</context> |
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167 |
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168 <para> |
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169 Defines a timeout for establishing a connection with another cluster node. |
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170 </para> |
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171 |
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172 </directive> |
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173 |
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174 |
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175 <directive name="zone_sync_interval"> |
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176 <syntax><value>time</value></syntax> |
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177 <default>1s</default> |
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178 <context>stream</context> |
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179 <context>server</context> |
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180 |
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181 <para> |
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182 Defines an interval for polling updates in a shared memory zone. |
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183 </para> |
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184 |
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185 </directive> |
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186 |
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187 |
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188 <directive name="zone_sync_recv_buffer_size"> |
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189 <syntax><value>size</value></syntax> |
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190 <default>4k|8k</default> |
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191 <context>stream</context> |
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192 <context>server</context> |
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193 |
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194 <para> |
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195 Sets <value>size</value> of a per-connection receive buffer used to parse |
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196 incoming stream of synchronization messages. |
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197 The buffer size must be equal or greater than one of the |
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198 <link id="zone_sync_buffers"/>. |
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199 By default, the buffer size is equal to |
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200 <link id="zone_sync_buffers">zone_sync_buffers</link> <value>size</value> |
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201 multiplied by <value>number</value>. |
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202 </para> |
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203 |
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204 </directive> |
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205 |
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206 |
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207 <directive name="zone_sync_server"> |
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208 <syntax><value>address</value> [<literal>resolve</literal>]</syntax> |
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209 <default></default> |
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210 <context>server</context> |
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211 |
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212 <para> |
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213 Defines the <value>address</value> of a cluster node. |
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214 The address can be specified as a domain name or IP address |
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215 with a mandatory port, or as a UNIX-domain socket path |
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216 specified after the “<literal>unix:</literal>” prefix. |
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217 A domain name that resolves to several IP addresses defines |
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218 multiple nodes at once. |
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219 </para> |
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220 |
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221 <para id="resolve"> |
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222 The <literal>resolve</literal> parameter instructs nginx to monitor |
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223 changes of the IP addresses that correspond to a domain name of the node |
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224 and automatically modify the configuration |
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225 without the need of restarting nginx. |
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226 </para> |
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227 |
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228 <para> |
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229 Cluster nodes are specified either dynamically as a single |
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230 <literal>zone_sync_server</literal> directive with |
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231 the <literal>resolve</literal> parameter, or statically as a series of several |
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232 directives without the parameter. |
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233 <note> |
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234 Each cluster node should be specified only once. |
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235 </note> |
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236 <note> |
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237 All cluster nodes should use the same configuration. |
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238 </note> |
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239 </para> |
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240 |
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241 <para> |
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242 In order for the <literal>resolve</literal> parameter to work, |
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243 the <link doc="ngx_stream_core_module.xml" id="resolver"/> directive |
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244 must be specified in the |
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245 <link doc="ngx_stream_core_module.xml" id="stream"/> block. |
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246 Example: |
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247 <example> |
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248 stream { |
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249 resolver 10.0.0.1; |
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250 |
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251 server { |
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252 zone_sync; |
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253 zone_sync_server cluster.example.com:12345 resolve; |
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254 ... |
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255 } |
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256 } |
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257 </example> |
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258 </para> |
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259 |
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260 </directive> |
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261 |
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262 |
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263 <directive name="zone_sync_ssl"> |
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264 <syntax><literal>on</literal> | <literal>off</literal></syntax> |
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265 <default>off</default> |
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266 <context>stream</context> |
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267 <context>server</context> |
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268 |
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269 <para> |
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270 Enables the SSL/TLS protocol for connections 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"> |
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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 certificate 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_certificate_key"> |
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291 <syntax><value>file</value></syntax> |
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292 <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 a <value>file</value> with the secret key in the PEM format |
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298 used for authentication to another cluster server. |
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299 </para> |
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300 |
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301 </directive> |
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302 |
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303 |
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304 <directive name="zone_sync_ssl_ciphers"> |
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305 <syntax><value>ciphers</value></syntax> |
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306 <default>DEFAULT</default> |
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307 <context>stream</context> |
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308 <context>server</context> |
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309 |
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310 <para> |
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311 Specifies the enabled ciphers for connections to another cluster server. |
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312 The ciphers are specified in the format understood by the OpenSSL library. |
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313 </para> |
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314 |
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315 <para> |
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316 The full list can be viewed using the |
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317 “<command>openssl ciphers</command>” command. |
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318 </para> |
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319 |
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320 </directive> |
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321 |
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322 |
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323 <directive name="zone_sync_ssl_conf_command"> |
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324 <syntax><value>name</value> <value>value</value></syntax> |
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325 <default/> |
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326 <context>stream</context> |
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327 <context>server</context> |
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328 <appeared-in>1.19.4</appeared-in> |
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329 |
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330 <para> |
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331 Sets arbitrary OpenSSL configuration |
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332 <link url="https://www.openssl.org/docs/man1.1.1/man3/SSL_CONF_cmd.html">commands</link> |
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333 when establishing a connection with another cluster server. |
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334 <note> |
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335 The directive is supported when using OpenSSL 1.0.2 or higher. |
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336 </note> |
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337 </para> |
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338 |
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339 <para> |
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340 Several <literal>zone_sync_ssl_conf_command</literal> directives |
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341 can be specified on the same level. |
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342 These directives are inherited from the previous configuration level |
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343 if and only if there are |
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344 no <literal>zone_sync_ssl_conf_command</literal> directives |
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345 defined on the current level. |
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346 </para> |
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347 |
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348 <para> |
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349 <note> |
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350 Note that configuring OpenSSL directly |
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351 might result in unexpected behavior. |
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352 </note> |
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353 </para> |
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354 |
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355 </directive> |
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356 |
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357 |
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358 <directive name="zone_sync_ssl_crl"> |
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359 <syntax><value>file</value></syntax> |
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360 <default/> |
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361 <context>stream</context> |
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362 <context>server</context> |
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363 |
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364 <para> |
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365 Specifies a <value>file</value> with revoked certificates (CRL) |
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366 in the PEM format used to <link id="zone_sync_ssl_verify">verify</link> |
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367 the certificate of another cluster server. |
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368 </para> |
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369 |
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370 </directive> |
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371 |
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372 |
2304
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373 <directive name="zone_sync_ssl_name"> |
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374 <syntax><value>name</value></syntax> |
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375 <default>host from zone_sync_server</default> |
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376 <context>stream</context> |
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377 <context>server</context> |
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378 <appeared-in>1.15.7</appeared-in> |
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379 |
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380 <para> |
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381 Allows overriding the server name used to |
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382 <link id="zone_sync_ssl_verify">verify</link> |
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383 the certificate of a cluster server and to be |
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384 <link id="zone_sync_ssl_server_name">passed through SNI</link> |
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385 when establishing a connection with the cluster server. |
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386 </para> |
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387 |
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388 <para> |
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389 By default, the host part of the <link id="zone_sync_server"/> address is used, |
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390 or resolved IP address if the <link id="resolve"/> parameter is specified. |
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391 </para> |
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392 |
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393 </directive> |
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394 |
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395 |
2139
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396 <directive name="zone_sync_ssl_password_file"> |
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397 <syntax><value>file</value></syntax> |
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398 <default/> |
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399 <context>stream</context> |
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400 <context>server</context> |
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401 |
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402 <para> |
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403 Specifies a <value>file</value> with passphrases for |
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404 <link id="zone_sync_ssl_certificate_key">secret keys</link> |
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405 where each passphrase is specified on a separate line. |
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406 Passphrases are tried in turn when loading the key. |
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407 </para> |
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|
408 |
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|
409 </directive> |
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|
410 |
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|
411 |
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412 <directive name="zone_sync_ssl_protocols"> |
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413 <syntax> |
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414 [<literal>SSLv2</literal>] |
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415 [<literal>SSLv3</literal>] |
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416 [<literal>TLSv1</literal>] |
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417 [<literal>TLSv1.1</literal>] |
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418 [<literal>TLSv1.2</literal>] |
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419 [<literal>TLSv1.3</literal>]</syntax> |
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420 <default>TLSv1 TLSv1.1 TLSv1.2</default> |
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421 <context>stream</context> |
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422 <context>server</context> |
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|
423 |
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424 <para> |
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425 Enables the specified protocols for connections to another cluster server. |
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426 </para> |
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|
427 |
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|
428 </directive> |
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|
429 |
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430 |
2304
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431 <directive name="zone_sync_ssl_server_name"> |
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432 <syntax><literal>on</literal> | <literal>off</literal></syntax> |
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433 <default>off</default> |
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434 <context>stream</context> |
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435 <context>server</context> |
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436 <appeared-in>1.15.7</appeared-in> |
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437 |
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438 <para> |
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439 Enables or disables passing of the server name through |
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440 <link url="http://en.wikipedia.org/wiki/Server_Name_Indication">TLS |
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441 Server Name Indication extension</link> (SNI, RFC 6066) |
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442 when establishing a connection with another cluster server. |
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443 </para> |
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444 |
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445 </directive> |
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446 |
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447 |
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448 <directive name="zone_sync_ssl_trusted_certificate"> |
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449 <syntax><value>file</value></syntax> |
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450 <default/> |
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451 <context>stream</context> |
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452 <context>server</context> |
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|
453 |
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|
454 <para> |
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|
455 Specifies a <value>file</value> with trusted CA certificates in the PEM format |
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456 used to <link id="zone_sync_ssl_verify">verify</link> |
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457 the certificate of another cluster server. |
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|
458 </para> |
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|
459 |
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|
460 </directive> |
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|
461 |
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|
462 |
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|
463 <directive name="zone_sync_ssl_verify"> |
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464 <syntax><literal>on</literal> | <literal>off</literal></syntax> |
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465 <default>off</default> |
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466 <context>stream</context> |
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467 <context>server</context> |
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|
468 |
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|
469 <para> |
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|
470 Enables or disables verification of another cluster server certificate. |
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|
471 </para> |
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|
472 |
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|
473 </directive> |
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|
474 |
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|
475 |
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|
476 <directive name="zone_sync_ssl_verify_depth"> |
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|
477 <syntax><value>number</value></syntax> |
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|
478 <default>1</default> |
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|
479 <context>stream</context> |
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|
480 <context>server</context> |
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|
481 |
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|
482 <para> |
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|
483 Sets the verification depth in another cluster server certificates chain. |
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|
484 </para> |
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|
485 |
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|
486 </directive> |
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|
487 |
2142
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|
488 |
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|
489 <directive name="zone_sync_timeout"> |
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|
490 <syntax><value>timeout</value></syntax> |
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|
491 <default>5s</default> |
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492 <context>stream</context> |
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493 <context>server</context> |
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494 |
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495 <para> |
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496 Sets the <value>timeout</value> between two successive |
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497 read or write operations on connection to another cluster node. |
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498 If no data is transmitted within this time, the connection is closed. |
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499 </para> |
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500 |
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501 </directive> |
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502 |
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503 </section> |
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504 |
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505 |
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506 <section id="stream_zone_sync_status" name="API endpoints"> |
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507 <para> |
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508 The synchronization status of a node is available via the |
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509 <link doc= "../http/ngx_http_api_module.xml" id="stream_zone_sync_">/stream/zone_sync/</link> |
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510 endpoint of the API which returns the |
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511 <link doc= "../http/ngx_http_api_module.xml" id="def_nginx_stream_zone_sync">following</link> |
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512 metrics. |
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513 </para> |
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514 |
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515 </section> |
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516 |
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517 |
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518 <section id="controlling_cluster_node" name="Starting, stopping, removing a cluster node"> |
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519 <para> |
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520 To start a new node, update a DNS record of a cluster hostname |
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521 with the IP address of the new node and start an instance. |
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522 The new node will discover other nodes from DNS or static configuration |
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523 and will start sending updates to them. |
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524 Other nodes will eventually discover the new node using DNS and |
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525 start pushing updates to it. |
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526 In case of static configuration, |
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527 other nodes need to be reloaded in order to send updates to the new node. |
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528 </para> |
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529 |
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530 <para> |
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531 To stop a node, send the <literal>QUIT</literal> signal to the instance. |
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532 The node will finish zone synchronization |
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533 and gracefully close open connections. |
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534 </para> |
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535 |
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536 <para> |
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537 To remove a node, update a DNS record of a cluster hostname |
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538 and remove the IP address of the node. |
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539 All other nodes will eventually discover that the node is removed, |
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540 close connections to the node, and will no longer try to connect to it. |
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541 After the node is removed, it can be stopped as described above. |
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542 In case of static configuration, other nodes need to be reloaded |
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543 in order to stop sending updates to the removed node. |
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544 </para> |
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545 |
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546 </section> |
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547 |
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548 </module> |