[ClusterLabs] Stonith

[Andrei Borzenkov]

On Mon, Dec 19, 2022 at 4:01 PM Antony Stone
<Antony.Stone at ha.open.source.it> wrote:
>
> On Monday 19 December 2022 at 13:55:45, Andrei Borzenkov wrote:
>
> > On Mon, Dec 19, 2022 at 3:44 PM Antony Stone
> >
> > <Antony.Stone at ha.open.source.it> wrote:
> > > So, do I simply create one stonith resource for each server, and rely on
> > > some other random server to invoke it when needed?
> >
> > Yes, this is the most simple approach. You need to restrict this
> > stonith resource to only one cluster node (set pcmk_host_list).
>
> So, just to be clear, I create one stonith resource for each machine which
> needs to be able to be shut down by some other server?
>

Correct.

> I ask simply because the acronym stonith refers to "the other node", so it
> sounds to me more like something I need to define so that a working machine can
> kill another one.
>

Yes, you define a stonith resource that can kill node A and nodes B,
C, D, ... will use this resource to kill A when needed. As long as
your stonith resource can actually work on any node it does not matter
which one will do the killing. You can restrict which nodes can use
this stonith agent using usual location constraints if necessary.

But keep in mind that if the whole site is down (or unaccessible) you
will not have access to IPMI/PDU/whatever on this site so your stonith
agents will fail ...