[Pacemaker] Node removal in corosync-based cluster

[Vladislav Bogdanov]

Hi,

30.05.2011 17:12, Dejan Muhamedagic wrote:
> Hi,
> 
> On Sun, May 29, 2011 at 11:58:17PM +0300, Vladislav Bogdanov wrote:
>> Hi all.
>>
>> I've got a task to remove some nodes from cluster to save some power and
>> found that it is not sufficient to follow
>> http://www.clusterlabs.org/doc/en-US/Pacemaker/1.1/html/Pacemaker_Explained/s-node-delete.html#s-del-ais
> 
> Did you try just "crm node delete ..."? That should do whatever's
> necessary to remove a node (on which pacemaker be down).

What extra commands does it run comparing to Pacemaker Explained?

> 
> I can vaguely recall this case, but cannot remember anymore what
> was the outcome.
> 
> Thanks,
> 
> Dejan
> 
>> After pacemaker is then restarted on any another remaining node, removed
>> node comes back in a CIB (with OFFLINE status). Even removal of that
>> node from corosync's objdb with
>> corosync-objctl -d runtime.totem.pg.mrp.srp.members.COROSYNC_ID
>> does not help.
>>
>> The only way to completely remove node I found is to stop pacemaker on
>> all cluster nodes and start it again then. So there should be some
>> 'ghost' data in a running pacemaker instance which is not deleted after
>> removal of node data and status from a CIB.
>>
>> I hope this could be easily fixed, just a note that it does not fully
>> work now (1.1.5 with some patches from both 1.1 and devel).
>>
>> Best,
>> Vladislav
>>
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>> Bugs: http://developerbugs.linux-foundation.org/enter_bug.cgi?product=Pacemaker
> 
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> 
> Project Home: http://www.clusterlabs.org
> Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf
> Bugs: http://developerbugs.linux-foundation.org/enter_bug.cgi?product=Pacemaker