[Pacemaker] How are Scores computed regarding roles?

[Jake Smith]

----- Original Message -----
> From: "Marcos Tiago" <Marcos.Tiago at openet.com>
> To: pacemaker at oss.clusterlabs.org
> Sent: Tuesday, February 5, 2013 3:11:13 PM
> Subject: [Pacemaker] How are Scores computed regarding roles?
> 
> 
> 
> 
> 
> Guys,
> 
> 
> 
> I am having trouble configuring a collocation in crm (corosync), but
> I am not sure if what I want is possible. This is the scenario:
> 
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> Let's say it's a 2 node cluster, with one resource in each. RES1 is
> with location inf in Node1, and RES2 is with location inf in Node2.
> Both resources are in Started role.
> 
> 
> 
> I have a third resource (IP address) that has: colocation 20 with
> RES1 and colocation 10 with RES2, so that if RES1 fails, it moves to
> node2.
> 
> 
> 
> When RES1 is restarted after a failure, the IP resource moves to Node
> 1, as expected.
> 
> 
> 
> But the IP is moving to Node 1 * before * RES1 is in Started state,
> which is not good for my situation because RES1 is not ready to
> receive requests yet.
> 
> 
> 
> I would like the IP to move back to Node 1 only when RES1 is in
> Started role.
> 
> 
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> In other words, I would like the score associated with RES1 to be
> computed only when RES1 is Started.
> 
> 
> 
> Is this even possible? If it is, how? If it’s not, then how could I
> achieve such behavior?
> 

There may be a cleaner way but one option would be to create two Dummy resources - DUM1 DUM2.
Order RES1 then DUM1, collocate DUM1 with RES1.
Do the same for DUM2.
Now collocate your IP with the dummy resources instead of RES.
Dummy won't be started until RES is started because of the order statement.  Then IP will move once Dummy has been placed.

Kinda ugly but I think it would be effective.

HTH

Jake

> 
> 
> Thanks!
> 
> Marcos
> 
> Sao Paulo – Brazil
> 
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> 
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