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

[Ulrich Windl]

>>> "Lentes, Bernd" <bernd.lentes at helmholtz-muenchen.de> schrieb am 07.02.2022
um
14:24 in Nachricht
<1490802403.168299850.1644240284175.JavaMail.zimbra at helmholtz-muenchen.de>:
> Hi,
> 
> i'm currently changing a bit in my cluster because i realized the my 
> configuration for a power outtage didn't work as i expected.
> My idea is currently:
> - first stop about 20 VirtualDomains, which are my services. This will 
> surely takes some minutes.
> I'm thinking of stopping each with a time difference of about 20 seconds for

> not getting to much IO load.
> and then ...
> - how to stop the other resources ?
> - put the nodes into standby or offline ?
> - do a systemctl stop pacemaker ?
> - or do a crm cluster stop ?

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?


> 
> 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.
So maybe an option could be: Do nothing, or do an emergency shutdown of the
node without properly migrating all the VMs elsewhere.
You cannot make an application HA by putting it in a VM; at least not in
general.

Regards,
Ulrich

> 
> Thanks for your help.
> 
> Bernd
> 
> -- 
> 
> Bernd Lentes 
> System Administrator 
> Institute for Metabolism and Cell Death (MCD) 
> Building 25 - office 122 
> HelmholtzZentrum München 
> bernd.lentes at helmholtz-muenchen.de 
> phone: +49 89 3187 1241 
> fax: +49 89 3187 2294 
> http://www.helmholtz-muenchen.de/mcd 
> 
> 
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