[ClusterLabs] if resourceA starts @nodeA then start resource[xy] @node[xy]

[Ken Gaillot]

On Tue, 2017-10-10 at 12:06 +0100, lejeczek wrote:
> 
> On 26/09/17 13:15, Klaus Wenninger wrote:
> > On 09/26/2017 02:06 PM, lejeczek wrote:
> > > hi fellas
> > > 
> > > can something like in the subject pacemaker do? And if yes then
> > > how to
> > > do it?
> > 
> > You could bind ResourceA to nodeA and resource[xy] to node[xy] via
> > location constraints.
> > Afterwards you could make resource[xy] depend on ResourceA -
> > without
> > collocation.
> > The actual commands (based on crmsh or pcs) to create these rules
> > depend on thedistribution you are using.
> > 
> > Regards,
> > Klaus
> 
> thanks,
> I am probably hoping for too much(?) - without man made 
> constraints but sort of cluster logic would make these 
> decisions: wherever it decided to start/run resourceA then 
> rourceB would have to run on different(all or remaining 
> cluster's nodes).
> 
> I'd only have to tell it something like: if you started 
> resourceA on nodeA then remaing(or maybe specific) resources 
> start on all but nodeA nodes.

Sure, that's simply a colocation constraint with a negative score.

For details, see http://clusterlabs.org/doc/en-US/Pacemaker/1.1-pcs/htm
l-single/Pacemaker_Explained/index.html#s-resource-colocation (and/or
the help for whatever higher-level tools you're using)

> 
> > > I'm looking into docs but before I'd gone through it all I hoped
> > > an
> > > expert could tell.
> > > 
> > > many thanks, L.
-- 
Ken Gaillot <kgaillot at redhat.com>