[ClusterLabs] FR: send failcount to OCF RA start/stop actions

Klaus Wenninger kwenning at redhat.com
Wed May 4 09:49:28 EDT 2016

On 05/04/2016 02:09 PM, Adam Spiers wrote:
> Hi all,
> As discussed with Ken and Andrew at the OpenStack summit last week, we
> would like Pacemaker to be extended to export the current failcount as
> an environment variable to OCF RA scripts when they are invoked with
> 'start' or 'stop' actions.  This would mean that if you have
> start-failure-is-fatal=false and migration-threshold=3 (say), then you
> would be able to implement a different behaviour for the third and
> final 'stop' of a service executed on a node, which is different to
> the previous 'stop' actions executed just prior to attempting a
> restart of the service.  (In the non-clone case, this would happen
> just before migrating the service to another node.)
So what you actually want to know is how much headroom
there still is till the resource would be migrated.
So wouldn't it then be much more catchy if we don't pass
the failcount but rather the headroom?
> One use case for this is to invoke "nova service-disable" if Pacemaker
> fails to restart the nova-compute service on an OpenStack compute
> node.
> Is it feasible to squeeze this in before the 1.1.15 release?
> Thanks a lot!
> Adam
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