[Pacemaker] Need an idea for dynamic configuration dependng on resource distribution

[Michael Schwartzkopff]

Am Dienstag, 27. April 2010 14:45:21 schrieb Andreas Mock:
> Hi all,
>
> I need an idea how I could achieve the following with corosync/pacemaker.
> 2 servers in a cluster. Each server is running a resource on its own by
> pacemaker configuration in the default case (everything o.k.). In this
> scenario the resources shall take as much "server estate" as possible.
> As soon as one server fails and one of the resources has to move so that
> both resources run on one server I would like to change the configuration
> so that both resources share the "server estate".
>
> Has anyone an idea how to achieve this?
> Or probably done before successfully?
>
> Best regards
> Andreas Mock
>
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First solution:
Write external scripts that check the coexistance of the services on a node 
and reconfigure them accordingly.

Second solution:
Hack the RA scripts and add such a check to the start section. Basically that 
means to derive your own RAs from the existing ones.

Please keep in mind to revert the config changes as soon the services run on 
different nodes again.

Greetings,

-- 
Dr. Michael Schwartzkopff
MultiNET Services GmbH
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