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.
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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