drbd-graceful-shutdown.service interfering with Pacemaker

[Reid Wahl]

Thanks, all!

On Tue, Jan 28, 2025 at 9:41 AM Akemi Yagi <toracat at elrepo.org> wrote:
>
> On Mon, Jan 27, 2025 at 4:00 AM Lars Ellenberg
> <lars.ellenberg at linbit.com> wrote:
> >
> > On Thu, Jan 23, 2025 at 12:56:11PM -0800, Reid Wahl wrote:
> > > Hi, we at Red Hat received a user bug report today involving drbd and Pacemaker.
> > >
> > > When shutting down the system (e.g., with `shutdown -r now`),
> > > Pacemaker hangs when trying to stop the cluster resource that manages
> > > drbd. If the user manually stops Pacemaker before shutdown (e.g.,
> > > `systemctl stop pacemaker`), the problem does not occur.
> >
> > So apparently we forgot to add a "Before=pacemaker.service"
> > or even better "Before=resource-agents-deps.target"
> > to the graceful shutdown service.
> >
> > If you don't need it in your environment, you can still "mask" it.
> >
> > I have some changes queued up for our systemd thingies,
> > I'll work that in as well.
> >
> > BTW, stopping pacemaker explicitly first should be a generic recommendation
> > and has proven useful in many cases.
> > Because all sorts of missing dependencies for all sorts of things, which,
> > because of the racy nature, only "sometimes" are stopped "too early".
> >
> > And because, whenever there is a problem during shutdown of pacemaker,
> > for whatever reason, and you already initiated the system shutdown,
> > you have very limited means to "help it along", and sometimes need to
> > wait out all of the timeouts and escalation timeouts.
> >
> > Thank you for the report.
> >
> >     Lars
>
> Hi,
>
> If you run RHEL (or its rebuild), you can get the drbd-utils package
> that has the proposed fix. It is currently in the elrepo-testing
> repository.
>
> EL8:
> https://elrepo.org/linux/testing/el8/x86_64/RPMS/drbd90-utils-9.30.0-2.el8.elrepo.x86_64.rpm
>
> EL9:
> https://elrepo.org/linux/testing/el9/x86_64/RPMS/drbd9x-utils-9.30.0-2.el9.elrepo.x86_64.rpm
>
> Akemi
>


-- 
Regards,

Reid Wahl (He/Him)
Senior Software Engineer, Red Hat
RHEL High Availability - Pacemaker