8:06 p.m.
I was just trying to do the same thing, I was going to use power
management, and the api.
I asked if this feature already exists in the cluster policy.
With the cluster policy you can control how the vms get distributed, and
then I was going to write a script on the engine that would use the api to
put the host in maintenance, then use the api to tell power management to
turn off the host... When load gets above 75%, the script would power a
server on, and then take it out of maintenance. The cluster policy would
take care of the rest.
Anyone else doing something like this?
-Donny D
On Sep 24, 2015 2:18 AM, "Nir Soffer" <nsoffer(a)redhat.com> wrote:
On Fri, Sep 18, 2015 at 4:26 PM, Luca Bertoncello <
L.Bertoncello(a)queo-group.com> wrote:
> Hi again,
>
> I'm trying to write a systemd-script (for CentOS7) in order to
> automatically put the host in "maintenance" on shutdown and to activate it
> after boot.
> I wrote a python-script that to that and it works so that I can start it
> and see the host in "maintenance" and having all VMs migrated.
>
> Unfortunately I can't call this script on shutdown/reboot and wait until
> all VMs are migrated and the host is in maintenance.
>
I don't think this will work, since you must put the host into
maintenance, and wait until all vms were migrated before you reboot the
host.
All this can be done only by controlling engine, not from the host that is
going to shutdown.
If you want to trigger this from the host itself, I would write an
ovirt-shutdown tool, ask engine to put the host into maintenance, wait
until all vms migrate, and the invoke the real shutdown command.
I guess it would be more useful to run this tool not on the host you want
to reboot but on another machine.
It may be possible to somehow get systemd to use this tool instead of the
shutdown command, but I don't think it is a good idea. This will make your
host fail to shutdown if your tool is buggy.
Maybe ask on systemd mailing list about this.
>
> Here my script:
>
> [Unit]
> Description=oVirt interface for managing host
> After=remote-fs.target vdsmd.service multipathd.service libvirtd.service
> time-sync.target iscsid.service rpcbind.service supervdsmd.service
> sanlock.service vdsm-network.service
> Wants=remote-fs.target vdsmd.service multipathd.service libvirtd.service
> time-sync.target iscsid.service rpcbind.service supervdsmd.service
> sanlock.service vdsm-network.service
>
> [Service]
> Type=simple
> RemainAfterExit=yes
> ExecStart=/usr/local/bin/ovirt-maintenance.sh active
> ExecStop=/usr/local/bin/ovirt-maintenance.sh maintenance
> KillMode=none
>
> [Install]
> WantedBy=multi-user.target
>
> Could someone help me and say what I'm doing wrong?
>
> Thanks a lot
>
> Mit freundlichen Grüßen
>
> Luca Bertoncello
>
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