[ClusterLabs] 2-Node Cluster - fencing with just one node running ?

[Lentes, Bernd]

----- On 4 Aug, 2022, at 19:46, Reid Wahl nwahl at redhat.com wrote:

>> It shuts down ha-idg-2:
>> 2022-08-03T01:19:51.866200+02:00 ha-idg-2 systemd-logind[1535]: Power key
>> pressed.
>> 2022-08-03T01:19:52.048335+02:00 ha-idg-2 systemd-logind[1535]: System is
>> powering down.
>> 2022-08-03T01:19:52.051815+02:00 ha-idg-2 systemd[1]: Stopped target
>> resource-agents dependencies.
>>  ...
> 
> Yes, but it thought it was shutting down ha-idg-1.
> 
>>
>> Then it stops cluster software on ha-idg-1:
>> Aug 03 01:19:58 [19361] ha-idg-1 pacemakerd:  warning: pcmk_child_exit: Shutting
>> cluster down because crmd[19368] had fatal failure
>> Aug 03 01:19:58 [19361] ha-idg-1 pacemakerd:   notice: pcmk_shutdown_worker:
>> Shutting down Pacemaker
>> Aug 03 01:19:58 [19361] ha-idg-1 pacemakerd:   notice: stop_child:      Stopping
>> pengine | sent signal 15 to process 19367
>>  ...
> 
> Node ha-idg-1 received a notification from the fencer that said "hey,
> we just fenced ha-idg-1!" Then it said "oh no, that's me! I'll shut
> myself down now."
> 
> That can be helpful if we're using fabric fencing. That's not supposed
> to happen with power fencing. The shutdown on ha-idg-1 didn't hurt
> anything, but it should have gotten powered off (instead of powering
> off ha-idg-2.
> 
What is "fabric" fencing and "power" fencing ?
Fabric something like ILO or IPMI ? And power fencing is cutting off power by controllable
UPS or power switches ?

Bernd
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