Il giorno mar 6 lug 2021 alle ore 17:33 Nir Soffer <nsof...@redhat.com> ha scritto:
> On Tue, Jul 6, 2021 at 5:58 PM Scott Worthington > <scott.c.worthing...@gmail.com> wrote: > > > > > > > > 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). > > I would trigger this once power is lost. You never know how much time > migration will take, so best migrate all vms immediately. > > It would be nice to integrate this with engine, but we can start by > something > like you describe, that will use engine API/SDK to prepare the hosts for > graceful shutdown. > we already have a role for immediate shutdown of the whole datacenter: https://github.com/oVirt/ovirt-ansible-shutdown-env now integrated in ansible collection https://github.com/oVirt/ovirt-ansible-collection/tree/master/roles/shutdown_env > > > [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 > > -- Sandro Bonazzola MANAGER, SOFTWARE ENGINEERING, EMEA R&D RHV Red Hat EMEA <https://www.redhat.com/> sbona...@redhat.com <https://www.redhat.com/> *Red Hat respects your work life balance. Therefore there is no need to answer this email out of your office hours. <https://mojo.redhat.com/docs/DOC-1199578>*
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