On Tue, Jul 6, 2021 at 8:13 AM Nir Soffer <nsof...@redhat.com> wrote:
> On Tue, Jul 6, 2021 at 2:29 PM Sandro Bonazzola <sbona...@redhat.com> > wrote: > >> >> >> Il giorno mar 6 lug 2021 alle ore 13:03 Nir Soffer <nsof...@redhat.com> >> ha scritto: >> >>> On Tue, Jul 6, 2021 at 1:11 PM Nathanaël Blanchet <blanc...@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. > This is outside of the scope of oVirt team: Perhaps one could combine multiple applications ( NUT + Ansible + Nagios/Zabbix ) to notify the oVirt engine to switch a host to maintenance? NUT[0] could be configured to alert a monitoring system ( like Nagios or Zabbix) to trigger an Ansible playbook [1][2] to put the host in maintenance mode, and the trigger should happen before the UPS battery is depleted (you'll have to account for the time it takes to live migrate VMs). [0] Network UPS Tools https://networkupstools.org/docs/user-manual.chunked/index.html [1] https://www.ovirt.org/develop/release-management/features/infra/ansible_modules.html [2] https://docs.ansible.com/ansible/latest/collections/ovirt/ovirt/ovirt_host_module.html
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