[Pacemaker] configuration of stonith

[Michael Schwartzkopff]

Am Montag, 9. Dezember 2013, 07:42:59 schrieb Masopust, Christian:
> > >> If you're using 1.1.10+,
> > >> 
> > >> pcs stonith create fence_pcmk1_ipmi fence_ipmilan \
> > >> 
> > >>     pcmk_host_list="pcmk-1" ipaddr="pcmk-1.ipmi" \
> > >>     action="reboot" login="admin" passwd="secret" delay=15 \
> > >>     op monitor interval=60s
> > >> 
> > >> pcs stonith create fence_pcmk2_ipmi fence_ipmilan \
> > >> 
> > >>     pcmk_host_list="pcmk-2" ipaddr="pcmk-2.ipmi" \
> > >>     action="reboot" login="admin" passwd="secret" delay=15 \
> > >>     op monitor interval=60s
> > >> 
> > >> is sufficient.
> > > 
> > > Hi,
> > > 
> > > just two questions about setting these stonith:
> > > 
> > > - shouldn't the delay's be different to avoid a stonith-battle?
> > 
> > As Emmanuel said, yes, it is needed to avoid dual-fencing in two-node
> > clusters, though the issue is not restricted to rhcs (or any HA
> > clustering that allows two nodes).
> > 
> > The node with the 'delay="15"' will have a 15 second
> > head-start, so in a
> > network partition triggered fence, the node with the delay
> > should always
> > live and the node without the delay will be immediately fenced.
> > 
> > > - when creating these stonith I see them both started on one single
> > > 
> > >   node. Don't I need some location constraints?  Such that
> > 
> > "fence_pcmk1"
> > 
> > >   only runs on pcmk2 and vice versa?
> > 
> > What version of pacemaker are you using?
> 
> Hi Digimer,
> 
> first when seeing this behaviour there was version 1.1.8. This weekend
> I've updated to 1.1.10 (latest available with CentOS 6.5) and now I see
> that fence_pcmk1 is started at pcmk1 and fence_pcmk2 at pcmk2.
> Is that correct? To my (probably wrong) understanding it should be
> vice-versa, shouldn't it?

fence_pcmk1 is the resource that can fence node pcmk1. If that resource runs 
on node pcmk1 it is useless since node 2 has to be able to fence node 1.

Add location constraints that prevent the fencing resource that can fence node 
1 trunning on node 1.

-- 
Mit freundlichen Grüßen,

Michael Schwartzkopff

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