[ClusterLabs] Preventing switchover in case of failing ping node

Ken Gaillot kgaillot at redhat.com
Tue Nov 8 16:04:56 EST 2016

On 11/03/2016 08:49 AM, Detlef Gossrau wrote:
> Hi all,
> is it possible to prevent a switchover in a active/passive cluster if a
> ping node completely fails ?
> Situation:
> A ping node is put into maintenance and not reachable for a certain
> time. The cluster nodes getting the information about the failing ping
> node at different times. For example, node 1 - which is the passive node
> - is getting the information earlier than node 2. As a result the
> resources are moved to node 2. But in the case the ping node is not
> available at all, no switchover should be executed. Is it possible to
> prevent this ?

There's no way for one node to predict that all other nodes will also be
unable to see the target. The only workarounds I see are:

* Use a second ping target on a different path, if available

* If the maintenance is planned, you could disable the relevant
constraints during the window

> Thanks for any help !
> Best regards,
> Detlef

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