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
56 lines
2.6 KiB
XML
56 lines
2.6 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="_set_basic_cluster_properties">
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<title>Set basic cluster properties</title>
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<para>Once your Pacemaker cluster is set up, it is recommended to set a few
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basic cluster properties. To do so, start the <literal>crm</literal> shell and change
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into the configuration menu by entering
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<literal>configure</literal>. Alternatively. you may jump straight into the Pacemaker
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configuration menu by typing <literal>crm configure</literal> directly from a shell
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prompt.</para>
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<para>Then, set the following properties:</para>
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<programlisting>property no-quorum-policy="ignore" \ # <co xml:id="CO2-1"/>
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pe-warn-series-max="1000" \ # <co xml:id="CO2-2"/>
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pe-input-series-max="1000" \
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pe-error-series-max="1000" \
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cluster-recheck-interval="5min" # <co xml:id="CO2-3"/></programlisting>
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<calloutlist>
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<callout arearefs="CO2-1">
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<para>
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Setting <literal>no-quorum-policy="ignore"</literal> is required in 2-node Pacemaker
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clusters for the following reason: if quorum enforcement is enabled,
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and one of the two nodes fails, then the remaining node can not
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establish a <emphasis>majority</emphasis> of quorum votes necessary to run services, and
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thus it is unable to take over any resources. The appropriate
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workaround is to ignore loss of quorum in the cluster. This is safe
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and necessary <emphasis>only</emphasis> in 2-node clusters. Do not set this property in
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Pacemaker clusters with more than two nodes.
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</para>
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</callout>
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<callout arearefs="CO2-2">
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<para>
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Setting <literal>pe-warn-series-max</literal>, <literal>pe-input-series-max</literal> and
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<literal>pe-error-series-max</literal> to 1000 instructs Pacemaker to keep a longer
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history of the inputs processed, and errors and warnings generated, by
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its Policy Engine. This history is typically useful in case cluster
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troubleshooting becomes necessary.
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</para>
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</callout>
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<callout arearefs="CO2-3">
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<para>
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Pacemaker uses an event-driven approach to cluster state
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processing. However, certain Pacemaker actions occur at a configurable
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interval, <literal>cluster-recheck-interval</literal>, which defaults to 15 minutes. It
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is usually prudent to reduce this to a shorter interval, such as 5 or
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3 minutes.
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</para>
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</callout>
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</calloutlist>
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<para>Once you have made these changes, you may <literal>commit</literal> the updated
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configuration.</para>
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</section>
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