[Pacemaker] Providing high availability for multiple applications.

[Michael Schwartzkopff]

> Hi all,
> 
> I've been investigating Pacemaker/Corosync for providing high availability
> for a wide range of applications. I found this combination to be very
> useful. Some of my applications require a fail-over cluster while others
> require load-balanced cluster.
> 
> I am wondering what are the best practices when managing the clusters for
> those applications.
> 
> Currently, each application runs in a separate/dedicated cluster. I
> essentially have different corosync configurations, one per cluster.
> 
> I am wondering if it is not better to setup 1 large Pacemaker cluster which
> is partitioned in such a way that certain resources are dedicated to a
> certain application (using node attribute expressions like in
> http://www.clusterlabs.org/doc/en-US/Pacemaker/1.0/html/Pacemaker_Explaine
> d/ch-rules.html#s-expression-attribute).
> 
> There would only be 1 Corosync configuration, and the cluster is
> partitioned using some naming convention. It seems to me that this would
> simplify management.
> 
> I wonder what people think about this approach.
> 
> Many thanks in advance.
> 
> Guillaume.

Yes. gathering all applications in one cluster is possible. From my experience 
I would think about two points:

- Be sure to make your cluster powerful enough that the applications still run 
if one (ore two) servers are down.

- Make a separate cluster for the loadbalancers. That makes debugging much 
easier.

Greetings,

-- 
Dr. Michael Schwartzkopff
Guardinistr. 63
81375 München

Tel: (0163) 172 50 98
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