[ClusterLabs] what is the "best" way to completely shutdown a two-node cluster ?
Jehan-Guillaume de Rorthais
jgdr at dalibo.com
Thu Feb 10 10:40:00 EST 2022
On Thu, 10 Feb 2022 22:15:07 +0800
Roger Zhou via Users <users at clusterlabs.org> wrote:
> On 2/9/22 17:46, Lentes, Bernd wrote:
> > ----- On Feb 7, 2022, at 4:13 PM, Jehan-Guillaume de Rorthais
> > jgdr at dalibo.com wrote:
> >> On Mon, 7 Feb 2022 14:24:44 +0100 (CET)
> >> "Lentes, Bernd" <bernd.lentes at helmholtz-muenchen.de> wrote:
> >>> Hi,
> >>> i'm currently changing a bit in my cluster because i realized that 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
> >>> ...
> This part is tricky. At one hand, it is good thinking to throttle IO load.
> On the other hand, as Jehan and Ulrich mentioned, `crm resource stop <rsc>`
> introduces "target‑role=Stopped" for each VirtualDomain, and have to do `crm
> resource start <rsc>` to changed it back to "target‑role=Started" to start
> them after the power outage.
I wonder if after the cluster shutdown complete, the target-role=Stopped could
be removed/edited offline with eg. crmadmin? That would make VirtualDomain
startable on boot.
I suppose this would not be that simple as it would require to update it on all
nodes, taking care of the CIB version, hash, etc... But maybe some tooling
could take care of this?
Last, if Bernd need to stop gracefully the VirtualDomain paying attention to
the I/O load, maybe he doesn't want them start automatically on boot for the
exact same reason anyway?
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