[openstack-dev] blueprint proposal nova-compute fencing for HA ?
ubuntu at consolejunkie.net
Tue Apr 23 07:31:40 UTC 2013
> I was only talking about the fencing off a compute node part, since
> that's what you started the thread with. :-)
I know I'm going in circles, just trying to get a feel for the best way to handle it.
> Presumably you would still use nova APIs that already exist to move the
> instances elsewhere. An 'evacuate' API went in to grizzly for this.
So when any node fails in a Pacemaker cluster, you fence the node, tell OpenStack about the
failed node and call evacuate for all the instances. The scheduler will just place them anywhere
(there is already a blueprint for evacuate to call the scheduler and even an other for handling a whole node)
So, yeah, maybe that is enough.
I guess I was hoping all machines would be the same. Now I'll need to make clusters. To OpenStack
they will still all look the same I guess.
But it will work with existing tested code, that is also important.
So no blueprint for fencing.
Thank you for the discussion.
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