[Linux-HA] Problem apprehending heartbeat 2.1.3

[Michael Alger]

On Fri, Jul 11, 2008 at 10:29:55AM +0200, Thibaut Perrin wrote:
> I have one more question, my guess would be using colocation, but
> I'm not sure :
> 
> I have 2 nodes on my cluster, and for the moment I have 1 IP
> addresse resource and 1 apache resource.
> 
> I have set the stickiness scores to 100.
> 
> When I standby the default node, the 2 resources switch to the
> second node, which is what I want.
> 
> When I turn my first node up, sometimes the 2 resources stay on
> the same node, which is OK, but sometimes, only the apache
> resource switches back. I am guessing I have to "link" these two
> resources. Is it really done by colocation ?

You can use colocation rules, but the easiest way would be probably
be to create a resource group, which does that and more for you.

  http://www.linux-ha.org/ClusterInformationBase/ResourceGroups

Quoting:

Resource groups are essentially a shortcut for creating a set of
resources that need to:

    * be started on the same node, and
    * started and stopped sequentially