[libvirt] libvirt-guests.sh without or with failing ACPI support

[Christian Ehrhardt]

On Tue, Dec 10, 2019 at 12:41 PM Henning Schild <henning.schild at siemens.com>
wrote:

> Am Tue, 10 Dec 2019 12:01:24 +0100
> schrieb Christian Ehrhardt <christian.ehrhardt at canonical.com>:
>
> > On Tue, Dec 10, 2019 at 10:46 AM Henning Schild
> > <henning.schild at siemens.com> wrote:
> >
> > > Hi all,
> > >
> > > the systemd shutdown scripts work sequentially with a 300s timeout
> > > (seen on Debian). If a VM does not have ACPI support, or the ACPI
> > > support failed for some reason, you are looking at a 300s timeout
> > > per instance for a host shutdown/reboot.
> > > i.e. 10 instances without working ACPI = 3000s to shut down
> > >
> > > I think the systemd scripting should be parallel instead of
> > > sequentially. So if you have many VMs without working ACPI you just
> > > have to wait 300s in total for the host to shut down.
> > >
> >
> > Hi Henning,
> > this is configurable in /etc/default/libvirt-guests
> > For example Ubuntu (otherwise using the same bits) changes that to run
> > PARALLEL_SHUTDOWN=10
> > SHUTDOWN_TIMEOUT=120
>
> Sweet. I went for the PARALLEL_SHUTDOWN=10 and left the 300. Maybe the
> default PARALLEL_SHUTDOWN value should not be 0 ?
>
> > I never got bugs about that config being too aggressive.
> > The change is old and as easy as:
> >
> https://git.launchpad.net/ubuntu/+source/libvirt/tree/debian/patches/ubuntu/parallel-shutdown.patch?h=ubuntu/focal-devel
> > Maybe you just want to open a bug with Debian to change the default
> > config there as well?
>
> No it is a bug in libvirt having the "wrong" defaults. And a bug in
> ubuntu not fixing it upstream ;).
>

No it isn't as it was discussed and nacked (years ago)


> Thanks,
> Henning
>
> > Steps to reproduce:
> > >  - star a VM that does not support ACPI
> > >  - reboot the host and wait 300s for the VM to be shut down
> > >  - now start it multiple times
> > >  - wait multiples of 300s for the shutdown
> > >
> > > Expected behaviour:
> > >  - no matter how many instances do not support ACPI, make it 300s
> > > max because we shut them down in parallel
> > >
> > >
> > > regards,
> > > Henning
> > >
> > >
> > > --
> > > libvir-list mailing list
> > > libvir-list at redhat.com
> > > https://www.redhat.com/mailman/listinfo/libvir-list
> > >
> > >
> >
>
>

-- 
Christian Ehrhardt
Staff Engineer, Ubuntu Server
Canonical Ltd
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