Hi,


I set highly available on, did not pin to any host, and also set the
watchdog which should reset if they go down but I'm not sure that will start
them if the host comes up and the VMs are not running.  I'll look at the CLI
first.


The engine will try to keep the VM running. So if one host goes down,
it will restart the VM on some other host automatically. We will also
migrate the VM (or some other to free resources) when the current host
gets too loaded. We do not require any migration addons, it just
works. But of course we have usually more hosts in a cluster to make
this possible.

I do not really remember what happens when all hosts are restarted
(power outage) though as that is quite special case.

Regards

--
Martin Sivak
SLA / oVirt

On Wed, Apr 6, 2016 at 9:10 PM, Brett I. Holcomb <biholcomb@l1049h.com> wrote:

On Wed, 2016-04-06 at 13:42 -0400, Adam Litke wrote:

On 06/04/16 01:46 -0400, Brett I. Holcomb wrote:

In VMware we could setup guests to autostart when the host started and
define the order.  Is that doable in oVirt?  The only thing I've seen
is the watchdog and tell it to reset but nothing that allows me to
define who starts up when and if they autostart.  I assume it's there
but I must be missing it or haven't found it in the web portal.


In oVirt guests aren't tied to a host by default (although you can set
them to run only on a specific host if you want).  The closest thing I
can think of would be the High Availability features (VM->Edit).
oVirt will try to restart highly available VMs if they go down.  You
can also set the priority for migration and restart in that pane.
Hopefully a combination of host pinning and the  high availability
settings will get you close enough to where you want to be.

Otherwise, you could always do some scripting with the ovirt REST API
using the SDK or CLI.


If you had the VMware migration extra add-on you could have hosts move as
needed so they were not tied to any host either but we could set a startup
order and specify auto, manual so that once the host started the VMs were
brought up as specified no matter what host they were running on.

I am running hosted-engine deployment with the Engine VM on the host.

I set highly available on, did not pin to any host, and also set the
watchdog which should reset if they go down but I'm not sure that will start
them if the host comes up and the VMs are not running.  I'll look at the CLI
first.

It would be nice if oVirt added this feature as it's really required for
large installations and is a help for any size installation, even small
ones.




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