[Pacemaker] Clone resource as a dependency

[Attila Megyeri]

Thanks Jake,

I did not try with the collocation constraint as the clone was running on all nodes, but I will give it a try – not sure whether this would work with a clone.
I am using pacemaker 1.1.6 on a debian system, the critical RAs are from latest github. The cluster is assymetric.

The config itself is quite big so I wouldn’t paste it here, but the basic requirement is very simple:


-          Primitive “fs” (filesystem)

-          Clone of “fs” with clone-max=4. It shall run on 4 of the 7 nodes.

-          primitive apache, which is allowed to run on 2 of 7 nodes, but in one instance only

-          property $id="cib-bootstrap-options" \

-                  dc-version="1.1.6-9971ebba4494012a93c03b40a2c58ec0eb60f50c" \

-                  cluster-infrastructure="openais" \

-                  expected-quorum-votes="7" \

-                  stonith-enabled="false" \

-                  no-quorum-policy="stop" \

-                  start-failure-is-fatal="false" \

-                  stonith-action="reboot" \

-                  symmetric-cluster="false" \

-                  last-lrm-refresh="1355960642"

-



The goal is to make sure that apache runs only if a FS clone is running on that node as well. At the same time, the FS clone must run on all 4 nodes.

Thanks,
Attila



From: Jake Smith [mailto:jsmith at argotec.com]
Sent: Thursday, December 20, 2012 8:37 PM
To: The Pacemaker cluster resource manager
Subject: Re: [Pacemaker] Clone resource as a dependency

A collocation constraint as well as the order so it must run on the same node as a running clone might do it.  Not quite sure with the clone though.

Doc reference would require some more info such as what version of pacemaker, etc.

Including configuration helps get answers quicker.

HTH
Jake

________________________________
From: "Attila Megyeri" <amegyeri at minerva-soft.com<mailto:amegyeri at minerva-soft.com>>
To: "The Pacemaker cluster resource manager" <pacemaker at oss.clusterlabs.org<mailto:pacemaker at oss.clusterlabs.org>>
Sent: Thursday, December 20, 2012 1:23:07 PM
Subject: Re: [Pacemaker] Clone resource as a dependency
Is this so difficult or so trivial, that no one responded? ☺

I would appreciate a reference to some documentation as well.

Thank you,
Attila

From: Attila Megyeri [mailto:amegyeri at minerva-soft.com]
Sent: Wednesday, December 19, 2012 10:05 AM
To: The Pacemaker cluster resource manager
Subject: [Pacemaker] Clone resource as a dependency

Hi,

How can I configure a resource (e.g. an apache) to depend on the start of a clone resource (e.g. a filesystem resource) for the given node?
I know how to arrange a primitive into a group, but in this particular case, the primitive must run on the passive node as well (performing some async offline operations), but apache may run only if the clone is started on the node where apache is about to start.

I tried by defining the clone resource and then by adding a mandatory order where apache depends on the filesystem resource, but apache keeps on running even if the filesystem runs only on a different node (stopped on the apache node).

BTW, the filesystem is glusterfs.

Thank you in advance!



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