[Pacemaker] How to run a set of resources on different nodes?

[Andrew Beekhof]

On Tue, Feb 14, 2012 at 2:58 AM, Tim Ward <Tim.Ward at ipaccess.com> wrote:
> If I've got a bunch of resources no two of which may run on the same
> node I can do this by creating and maintaining lots of constraints of
> the form
>
> <rsc_colocation id="not-1-with-2" rsc="resource1" with-rsc="resource2"
> score="-INFINITY"/>
> <rsc_colocation id="not-17-with-14" rsc="resource17"
> with-rsc="resource14" score="-INFINITY"/>
>
> etc (for n resources that's O(n squared) constraints, but I only need
> each one of the two possible ways round).
>
> But that has scope for being somewhat tedious to code and a nightmare to
> maintain (on deleting such a resource I'll have to write code which
> tries to work out what constraints relating it to other resources might
> exist and go round deleting them). Is there an easier and better way,
> such as being able to say "no two instances of this primitive may run on
> the same node"?
>
> (I have found a thread from 2010 which seems to suggest that someone was
> trying something along the lines of
>
> colocation c -inf: ( A B C )

I believe you want it without the brackets.

colocation c -inf: A B C


>
> but I didn't understand the discussion, particularly in relation to what
> the brackets mean and whether they are needed and where they go, or
> whether the guy actually got it working in the end.)
>
> Thanks
>
> Tim Ward
> Brett Ward Limited - www.brettward.co.uk
>
>
>
>
>
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