c71296175f
The XML root element of Docbook XML files should match the following format: <ELEMENT xmlns="http://docbook.org/ns/docbook" xmlns:xi="http://www.w3.org/2001/XInclude" xmlns:xlink="http://www.w3.org/1999/xlink" version="5.0" xml:id="THE_XML_ID_OF_THE_ELEMENT"> Change-Id: I47786e5f70b64e1b14d1015ec5613a538ef8fc52
19 lines
1.1 KiB
XML
19 lines
1.1 KiB
XML
<section xmlns="http://docbook.org/ns/docbook"
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xmlns:xi="http://www.w3.org/2001/XInclude"
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xmlns:xlink="http://www.w3.org/1999/xlink"
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version="5.0"
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xml:id="_memcached">
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<title>Memcached</title>
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<para>Most of OpenStack services use an application to offer persistence and store ephemeral data (like tokens).
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Memcached is one of them and can scale-out easily without specific trick.</para>
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<para>To install and configure it, read the <link xlink:href="http://code.google.com/p/memcached/wiki/NewStart">official documentation</link>.</para>
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<para>Memory caching is managed by oslo-incubator so the way to use multiple memcached servers is the same for all projects.</para>
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<para>Example with two hosts:</para>
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<programlisting>memcached_servers = controller1:11211,controller2:11211</programlisting>
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<para>By default, controller1 handles the caching service but if the host goes down, controller2 does the job.
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For more information about memcached installation, see the OpenStack
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Cloud Administrator Guide.</para>
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</section>
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