[Pacemaker] One more globally-unique clone question

Andrew Beekhof andrew at beekhof.net
Mon Jan 19 18:47:14 EST 2015

> On 17 Jan 2015, at 1:25 am, Vladislav Bogdanov <bubble at hoster-ok.com> wrote:
> Hi all,
> Trying to reproduce problem with early stop of globally-unique clone instances during move to another node I found one more "interesting" problem.
> Due to the different order of resources in the CIB and extensive use of constraints between other resources (odd number of resources cluster-wide) two CLUSTERIP instances are always allocated to the same node in the new testing cluster.

Ah, so this is why broker-vips:1 was moving.

> What would be the best/preferred way to make them run on different nodes by default?

By default they will.
I'm assuming its the constraints that are preventing this.

Getting them to auto-rebalance is the harder problem

> I see following options:
> * Raise priority of globally-unique clone so its instances are always allocated first of all.
> * Use utilization attributes (with high values for nodes and low values for cluster resources).
> * Anything else?
> If I configure virtual IPs one-by-one (without clone), I can add a colocation constraint with negative score between them. I do not see a way to scale that setup well though (5-10 IPs).
> So, what would be the best option to achieve the same with globally-unique cloned resource?
> May be there should be some internal preference/colocation not to place them together (like default stickiness=1 for clones)?
> Or even allow special negative colocation constraint and the same resource in both 'what' and 'with'
> (colocation col1 -1: clone clone)?
> Best,
> Vladislav
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