[Pacemaker] Looking for correct constraints

[Michael Schwartzkopff]

Am Freitag, 30. Oktober 2009 13:37:36 schrieb Dominik Klein:
> Michael Schwartzkopff wrote:
> > Am Freitag, 30. Oktober 2009 13:26:35 schrieb Lars Marowsky-Bree:
> >> On 2009-10-30T13:19:52, Michael Schwartzkopff <misch at multinet.de> wrote:
> >>> I have a three node cluster. I have two resources that are not allowed
> >>> to run together in the cluster. Basically resource2 is a failover case
> >>> for resource1.
> >>>
> >>> How can I tell the cluster not to run res1 and res2 together in the
> >>> cluster?
> >>
> >> You mean "start resource2 only when resource1 is not running anywhere,
> >> but prefer resource1"?
> >
> > Yes.
> >
> >> I'm not sure you can.
> >
> > That is bad news.
>
> Maybe set a cluster-wide attribute, which, when set, does not allow res2
> to run. Ie rule with score -infinity.
>
> res1 could remove this attribute while starting and set this attribute
> when stopping.
>
> Just an idea,
> Dominik

Yes. That would be the next step.

Since the res1 and res2 do differ only in the config file instance_attribute we 
also could introduce a rule for the attribute section of a combined resource. 
But that also would refer to some other attribute in the CIB.

Greetings,

-- 
Dr. Michael Schwartzkopff
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