On Tue, Jul 6, 2021 at 2:29 PM Sandro Bonazzola <sbonazzo@redhat.com> wrote:


Il giorno mar 6 lug 2021 alle ore 13:03 Nir Soffer <nsoffer@redhat.com> ha scritto:
On Tue, Jul 6, 2021 at 1:11 PM Nathanaël Blanchet <blanchet@abes.fr> wrote:
> We are installing UPS powerchute client on hypervisors.
>
> What is the default vms behaviour of running vms when an hypervisor is
> ordered to shutdown: do the vms live migrate or do they shutdown
> properly (even the restart on an other host because of HA) ?

In general VMs are not restarted after an unexpected shutdown, but HA VMs
are restarted after failures.

If the HA VM has a lease, it can restart safely on another host regardless of
the original host status. If the HA VM does not have a lease, the system must
wait until the original host is up again to check if the VM is still
running on this
host.

Arik can add more details on this.

I think the question is not related to what happens after the host is back.
I think the question is what happens when the host goes down.
To me, the right way to shutdown a host is putting it first to maintenance (VM evacuate to other hosts) and then shutdown.

Right, but the we don't have integration with the UPS, so engine cannot put the host
to maintenance when the host lose power and the UPS will shut it down after
few minutes.
 
On emergency shutdown without moving the host to maintenance first I think libvirt is communicating the host is going down to the guests and tries to cleanly shutdown vms while the host is going down.
Arik please confirm :-)

 

Nir
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