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view xml/en/docs/stream/ngx_stream_keyval_module.xml @ 2434:a1f61586779b
Listed not supported load balancing methods in upstream backup.
author | Yaroslav Zhuravlev <yar@nginx.com> |
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date | Wed, 25 Sep 2019 16:06:51 +0300 |
parents | dd3ac7eefeed |
children | d58fc33a0830 |
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<?xml version="1.0"?> <!-- Copyright (C) Nginx, Inc. --> <!DOCTYPE module SYSTEM "../../../../dtd/module.dtd"> <module name="Module ngx_stream_keyval_module" link="/en/docs/stream/ngx_stream_keyval_module.html" lang="en" rev="5"> <section id="summary"> <para> The <literal>ngx_stream_keyval_module</literal> module (1.13.7) creates variables with values taken from key-value pairs managed by the <link doc="../http/ngx_http_api_module.xml" id="stream_keyvals_">API</link>. </para> <para> <note> This module is available as part of our <commercial_version>commercial subscription</commercial_version>. </note> </para> </section> <section id="example" name="Example Configuration"> <para> <example> http { server { ... location /api { api write=on; } } } stream { keyval_zone zone=one:32k state=one.keyval; keyval $ssl_server_name $name zone=one; server { listen 12345 ssl; proxy_pass $name; ssl_certificate /usr/local/nginx/conf/cert.pem; ssl_certificate_key /usr/local/nginx/conf/cert.key; } } </example> </para> </section> <section id="directives" name="Directives"> <directive name="keyval"> <syntax> <value>key</value> <value>$variable</value> <literal>zone</literal>=<value>name</value></syntax> <default/> <context>stream</context> <para> Creates a new <value>$variable</value> whose value is looked up by the <value>key</value> in the key-value database. Strings are matched ignoring the case. The database is stored in a shared memory zone specified by the <literal>zone</literal> parameter. </para> </directive> <directive name="keyval_zone"> <syntax> <literal>zone</literal>=<value>name</value>:<value>size</value> [<literal>state</literal>=<value>file</value>] [<literal>timeout</literal>=<value>time</value>] [<literal>type</literal>=<literal>string</literal>|<literal>ip</literal>] [<literal>sync</literal>]</syntax> <default/> <context>stream</context> <para> Sets the <value>name</value> and <value>size</value> of the shared memory zone that keeps the key-value database. Key-value pairs are managed by the <link doc="../http/ngx_http_api_module.xml" id="stream_keyvals_">API</link>. </para> <para id="keyval_state"> The optional <literal>state</literal> parameter specifies a <value>file</value> that keeps the current state of the key-value database in the JSON format and makes it persistent across nginx restarts. </para> <para id="keyval_timeout"> The optional <literal>timeout</literal> parameter (1.15.0) sets the time after which key-value pairs are removed from the zone. </para> <para id="keyval_type"> The optional <literal>type</literal> parameter (1.17.1) specifies the type of the key: a <literal>string</literal> (default) or <literal>ip</literal>. For the <literal>ip</literal> type, the key must be the textual representation of an IP address specified in CIDR notation. In this case, an additional index optimized for matching IP addresses and networks is used in evaluating a variable. </para> <para id="keyval_sync"> The optional <literal>sync</literal> parameter (1.15.0) enables <link doc="ngx_stream_zone_sync_module.xml" id="zone_sync">synchronization</link> of the shared memory zone. The synchronization requires the <literal>timeout</literal> parameter to be set. <note> If the synchronization is enabled, removal of key-value pairs (no matter <link doc="../http/ngx_http_api_module.xml" id="patchStreamKeyvalZoneKeyValue">one</link> or <link doc="../http/ngx_http_api_module.xml" id="deleteStreamKeyvalZoneData">all</link>) will be performed only on a target cluster node. The same key-value pairs on other cluster nodes will be removed upon <literal>timeout</literal>. </note> </para> </directive> </section> </module>