Mercurial > hg > nginx-site
annotate xml/en/docs/http/ngx_http_keyval_module.xml @ 2699:8b96520ca495
Linux packages: clarified supported SLES versions
author | Konstantin Pavlov <thresh@nginx.com> |
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date | Tue, 30 Mar 2021 19:37:13 +0300 |
parents | bde7cd9a1173 |
children | 8831b3d9f332 |
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_http_keyval_module" |
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10 link="/en/docs/http/ngx_http_keyval_module.html" |
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11 lang="en" |
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12 rev="10"> |
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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_http_keyval_module</literal> module (1.13.3) creates variables |
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18 with values taken from key-value pairs managed by the |
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19 <link doc="ngx_http_api_module.xml" id="http_keyvals_">API</link> |
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20 or a variable (1.15.10) that can also be set with |
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21 <link doc="../njs/examples.xml" id="requests">njs</link>. |
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22 </para> |
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23 |
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24 <para> |
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25 <note> |
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26 This module is available as part of our |
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27 <commercial_version>commercial subscription</commercial_version>. |
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28 </note> |
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29 </para> |
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30 |
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31 </section> |
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32 |
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33 |
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34 <section id="example" name="Example Configuration"> |
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35 |
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36 <para> |
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37 <example> |
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38 http { |
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39 |
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40 keyval_zone zone=one:32k state=/var/lib/nginx/state/one.keyval; |
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41 keyval $arg_text $text zone=one; |
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42 ... |
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43 server { |
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44 ... |
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45 location / { |
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46 return 200 $text; |
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47 } |
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48 |
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49 location /api { |
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50 api write=on; |
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51 } |
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52 } |
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53 } |
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54 </example> |
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55 </para> |
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56 |
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57 </section> |
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58 |
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59 |
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60 <section id="directives" name="Directives"> |
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61 |
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62 <directive name="keyval"> |
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63 <syntax> |
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64 <value>key</value> |
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65 <value>$variable</value> |
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66 <literal>zone</literal>=<value>name</value></syntax> |
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67 <default/> |
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68 <context>http</context> |
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69 |
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70 <para> |
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71 Creates a new <value>$variable</value> whose value |
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72 is looked up by the <value>key</value> in the key-value database. |
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73 Matching rules are defined by the |
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74 <link id="keyval_type"><literal>type</literal></link> parameter of the |
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75 <link id="keyval_zone"><literal>keyval_zone</literal></link> directive. |
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76 The database is stored in a shared memory zone |
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77 specified by the <literal>zone</literal> parameter. |
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78 </para> |
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79 |
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80 </directive> |
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81 |
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82 |
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83 <directive name="keyval_zone"> |
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84 <syntax> |
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85 <literal>zone</literal>=<value>name</value>:<value>size</value> |
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86 [<literal>state</literal>=<value>file</value>] |
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87 [<literal>timeout</literal>=<value>time</value>] |
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88 [<literal>type</literal>=<literal>string</literal>|<literal>ip</literal>|<literal>prefix</literal>] |
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89 [<literal>sync</literal>]</syntax> |
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90 <default/> |
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91 <context>http</context> |
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92 |
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93 <para> |
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94 Sets the <value>name</value> and <value>size</value> of the shared memory zone |
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95 that keeps the key-value database. |
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96 Key-value pairs are managed by the |
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97 <link doc="ngx_http_api_module.xml" id="http_keyvals_">API</link>. |
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98 </para> |
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99 |
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100 <para id="keyval_state"> |
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101 The optional <literal>state</literal> parameter specifies a <value>file</value> |
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102 that keeps the current state of the key-value database in the JSON format |
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103 and makes it persistent across nginx restarts. |
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104 </para> |
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105 |
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106 <para> |
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107 Examples: |
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108 <example> |
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109 keyval_zone zone=one:32k state=/var/lib/nginx/state/one.keyval; # path for Linux |
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110 keyval_zone zone=one:32k state=/var/db/nginx/state/one.keyval; # path for FreeBSD |
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111 </example> |
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112 </para> |
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113 |
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114 <para id="keyval_timeout"> |
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115 The optional <literal>timeout</literal> parameter (1.15.0) sets |
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116 the time after which key-value pairs are removed from the zone. |
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117 </para> |
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118 |
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119 <para id="keyval_type"> |
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120 The optional <literal>type</literal> parameter (1.17.1) activates |
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121 an extra index optimized for matching the key of a certain type |
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122 and defines matching rules when evaluating |
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123 a <link id="keyval">keyval</link> <literal>$variable</literal>. |
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124 <note> |
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125 The index is stored in the same shared memory zone |
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126 and thus requires additional storage. |
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127 </note> |
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128 |
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129 <list type="tag"> |
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130 |
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131 <tag-name id="keyval_type_string"><literal>type=string</literal></tag-name> |
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132 <tag-desc> |
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133 default, no index is enabled; |
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134 variable lookup is performed using exact match |
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135 of the record key and a search key |
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136 </tag-desc> |
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137 |
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138 <tag-name id="keyval_type_ip"><literal>type=ip</literal></tag-name> |
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139 <tag-desc> |
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140 the search key is the textual representation of IPv4 or IPv6 address |
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141 or CIDR range; |
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142 to match a record key, the search key must belong to a subnet |
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143 specified by a record key or exactly match an IP address |
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144 </tag-desc> |
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145 |
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146 <tag-name id="keyval_type_prefix"><literal>type=prefix</literal></tag-name> |
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147 <tag-desc> |
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148 variable lookup is performed using prefix match |
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149 of a record key and a search key (1.17.5); |
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150 to match a record key, the record key must be a prefix of the search key |
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151 </tag-desc> |
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152 |
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153 </list> |
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154 </para> |
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155 |
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156 <para id="keyval_sync"> |
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157 The optional <literal>sync</literal> parameter (1.15.0) enables |
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158 <link doc="../stream/ngx_stream_zone_sync_module.xml" id="zone_sync">synchronization</link> |
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159 of the shared memory zone. |
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160 The synchronization requires the |
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161 <literal>timeout</literal> parameter to be set. |
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162 <note> |
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163 If the synchronization is enabled, removal of key-value pairs (no matter |
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164 <link doc="ngx_http_api_module.xml" id="patchHttpKeyvalZoneKeyValue">one</link> |
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165 or |
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166 <link doc="ngx_http_api_module.xml" id="deleteHttpKeyvalZoneData">all</link>) |
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167 will be performed only on a target cluster node. |
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168 The same key-value pairs on other cluster nodes |
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169 will be removed upon <literal>timeout</literal>. |
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170 </note> |
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171 </para> |
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172 |
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173 </directive> |
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174 |
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175 </section> |
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176 |
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177 </module> |