[ClusterLabs] Constraint question

[Ken Gaillot]

On Tue, 2021-10-05 at 18:05 -0400, john tillman wrote:
> Is it possible for a resource *not* to stop if a colocation
> constrained
> resource stops on all nodes?
> 
> My configuration per 'pcs constraint' output:
> 
> Location Constraints:
> Ordering Constraints:
> Colocation Constraints:
>   TheService with TheVIP
>   TheVip with TheDB-clone
> Ticket Constraints:
> 
> On boot, TheDB starts on a node and the other resources follow it and
> start there too.  All's well.
> 
> (Understand that the scenario below is part of a testing step.)
> 
> If I stop all the mysql database clones via "pcs resource disable" I
> see
> the VIP and service resources also stop.
> 
> So is there a way to configure the cluster so the service and VIP
> resources remain running on the last node they were on when all the
> databases are stopped?
> 
> Best Regards,
> John

Hi,

Yes, make the colocation optional (i.e. use a finite integer score)
-- 
Ken Gaillot <kgaillot at redhat.com>