[Linux-cluster] Service location (colocation)
lhh at redhat.com
Fri Mar 4 17:06:48 UTC 2011
On Sun, Feb 27, 2011 at 06:08:41PM +0200, Budai Laszlo wrote:
> Hi all,
> is there a way to define location dependencies among services? for
> instance how can I define that Service A should run on the same node as
> service B? Or the opposite: Service C should run on a different node
> than service D?
rgmanager doesn't have this feature built-in; you can define
'collocated services' by simply creating one large service comprising
all of the resources for both services.
You could probably trivially extend central_processing mode to do "anti
collocation" (i.e. run on another node).
The 'follow_service.sl' script is an example of how to do part of
'anti-collocation'. The way it works, it starts service A on a
different node from service B. If the node running service A fails, it
is started on the same node as service B, then service B is moved away
to another (empty, usually) node in the cluster.
Alternatively, pacemaker supports this functionality.
Lon Hohberger - Red Hat, Inc.
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