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annotate xml/en/docs/stream/ngx_stream_keyval_module.xml @ 2472:4823370295e6

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Removed invalid statement about keyval caseless match.
author Sergey Kandaurov <pluknet@nginx.com>
date Thu, 19 Dec 2019 13:00:58 +0300
parents 98fd810c13e0
children bde7cd9a1173
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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_keyval_module"
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10 link="/en/docs/stream/ngx_stream_keyval_module.html"
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11 lang="en"
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12 rev="8">
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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_keyval_module</literal> module (1.13.7) creates variables
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18 with values taken from key-value pairs managed by the
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19 <link doc="../http/ngx_http_api_module.xml" id="stream_keyvals_">API</link>.
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20 </para>
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21
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22 <para>
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23 <note>
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24 This module is available as part of our
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25 <commercial_version>commercial subscription</commercial_version>.
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26 </note>
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27 </para>
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28
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29 </section>
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30
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31
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32 <section id="example" name="Example Configuration">
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33
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34 <para>
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35 <example>
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36 http {
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37
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38 server {
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39 ...
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40 location /api {
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41 api write=on;
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42 }
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43 }
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44 }
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45
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46 stream {
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47
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48 keyval_zone zone=one:32k state=one.keyval;
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49 keyval $ssl_server_name $name zone=one;
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50
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51 server {
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52 listen 12345 ssl;
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53 proxy_pass $name;
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54 ssl_certificate /usr/local/nginx/conf/cert.pem;
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55 ssl_certificate_key /usr/local/nginx/conf/cert.key;
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56 }
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57 }
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58 </example>
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59 </para>
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60
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61 </section>
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62
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63
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64 <section id="directives" name="Directives">
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65
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66 <directive name="keyval">
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67 <syntax>
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68 <value>key</value>
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69 <value>$variable</value>
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70 <literal>zone</literal>=<value>name</value></syntax>
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71 <default/>
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72 <context>stream</context>
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73
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74 <para>
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75 Creates a new <value>$variable</value> whose value
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76 is looked up by the <value>key</value> in the key-value database.
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77 Matching rules are defined by the
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78 <link id="keyval_type"><literal>type</literal></link> parameter of the
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79 <link id="keyval_zone"><literal>keyval_zone</literal></link> directive.
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80 The database is stored in a shared memory zone
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81 specified by the <literal>zone</literal> parameter.
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82 </para>
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83
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84 </directive>
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85
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86
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87 <directive name="keyval_zone">
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88 <syntax>
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89 <literal>zone</literal>=<value>name</value>:<value>size</value>
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90 [<literal>state</literal>=<value>file</value>]
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91 [<literal>timeout</literal>=<value>time</value>]
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92 [<literal>type</literal>=<literal>string</literal>|<literal>ip</literal>|<literal>prefix</literal>]
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93 [<literal>sync</literal>]</syntax>
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94 <default/>
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95 <context>stream</context>
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96
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97 <para>
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98 Sets the <value>name</value> and <value>size</value> of the shared memory zone
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99 that keeps the key-value database.
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100 Key-value pairs are managed by the
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101 <link doc="../http/ngx_http_api_module.xml" id="stream_keyvals_">API</link>.
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102 </para>
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103
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104 <para id="keyval_state">
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105 The optional <literal>state</literal> parameter specifies a <value>file</value>
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106 that keeps the current state of the key-value database in the JSON format
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107 and makes it persistent across nginx restarts.
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108 </para>
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109
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110 <para id="keyval_timeout">
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111 The optional <literal>timeout</literal> parameter (1.15.0) sets
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112 the time after which key-value pairs are removed from the zone.
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113 </para>
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114
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115 <para id="keyval_type">
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116 The optional <literal>type</literal> parameter (1.17.1) activates
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117 an extra index optimized for matching the key of a certain type
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118 and defines matching rules when evaluating
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119 a <link id="keyval">keyval</link> <literal>$variable</literal>.
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120 <note>
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121 The index is stored in the same shared memory zone
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122 and thus requires additional storage.
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123 </note>
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124
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125 <list type="tag">
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126
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127 <tag-name id="keyval_type_string"><literal>type=string</literal></tag-name>
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128 <tag-desc>
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129 default, no index is enabled;
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130 variable lookup is performed using exact match
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131 of the record key and a search key
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132 </tag-desc>
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133
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134 <tag-name id="keyval_type_ip"><literal>type=ip</literal></tag-name>
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135 <tag-desc>
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136 the search key is the textual representation of IPv4 or IPv6 address
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137 or CIDR range;
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138 to match a record key, the search key must belong to a subnet
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139 specified by a record key or exactly match an IP address
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140 </tag-desc>
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141
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142 <tag-name id="keyval_type_prefix"><literal>type=prefix</literal></tag-name>
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143 <tag-desc>
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144 variable lookup is performed using prefix match
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145 of a record key and a search key (1.17.5);
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146 to match a record key, the record key must be a prefix of the search key
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147 </tag-desc>
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148
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149 </list>
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150 </para>
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151
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152 <para id="keyval_sync">
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153 The optional <literal>sync</literal> parameter (1.15.0) enables
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154 <link doc="ngx_stream_zone_sync_module.xml" id="zone_sync">synchronization</link>
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155 of the shared memory zone.
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156 The synchronization requires the
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157 <literal>timeout</literal> parameter to be set.
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158 <note>
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159 If the synchronization is enabled, removal of key-value pairs (no matter
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160 <link doc="../http/ngx_http_api_module.xml" id="patchStreamKeyvalZoneKeyValue">one</link>
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161 or
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162 <link doc="../http/ngx_http_api_module.xml" id="deleteStreamKeyvalZoneData">all</link>)
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163 will be performed only on a target cluster node.
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164 The same key-value pairs on other cluster nodes
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165 will be removed upon <literal>timeout</literal>.
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166 </note>
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167 </para>
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168
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169 </directive>
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170
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171 </section>
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172
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173 </module>