[ClusterLabs] Antw: [EXT] what is the "best" way to completely shutdown a two‑node cluster ?

[Lentes, Bernd]

----- On Feb 7, 2022, at 2:36 PM, Ulrich Windl Ulrich.Windl at rz.uni-regensburg.de wrote:


> 
> Bernd,
> 
> what if you set the node affected to standby, or shut down the cluster
> services? Or all all nodes powered by the same UPS?

All nodes are powered by the same UPS.

> 
> 
>> 
>> And what is if both nodes are running ? Can i do that simultaneously on both
> 
>> nodes ?
> 
> I guess that should work.
> 
>> My OS is SLES 12 SP5, pacemaker is 1.1.23, corosync is 2.3.6-9.13.1
> 
> Your action plan depends on what the VMNs are doing: basically every HA
> resource should survive a hard restart without much damange.

Well, some vm's have databases, i'd like to shutdown these cleanly.

> So maybe an option could be: Do nothing, or do an emergency shutdown of the
> node without properly migrating all the VMs elsewhere.

The VM's don't need to be migrated, the whole cluster should stop in a reasonable time and manner.

> You cannot make an application HA by putting it in a VM; at least not in
> general.

I know. But the time gap between one node having problems and booting the vm on the other node
is ok for us.

Bernd
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