It is sometimes desirable to preferentially constrain the master instance of a master/slave resource to run on a particular node or set of nodes in the cluster.

The CIB snippet below will add prefer the node ace to be master of the resource ms-drbd1 by 100 points.

<rsc_location id="loc:ms-drbd1_likes_ace" rsc="ms-drbd1">
  <rule id="rule:ms-drbd1_likes_ace" role="master" score="100">
    <expression  attribute="#uname" operation="eq" value="ace"/>
  </rule>
</rsc_location>

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