[Users] Auto-start vms on boot?

[Itamar Heim]

On 12/09/2012 02:55 PM, Adrian Gibanel wrote:
> This is how I see it:
>
> Engine should have an offline database of its assigned hosts and their
> state (With state I mean properties. One of these properties would be
> the auto-start one).
> So when a host starts the engine starts and then loops assigned virtual
> machines. While looping the virtual machines checs its auto-start
> property. If it's set to true it starts the virtual machine.
>
> Not sure if what I am describing has an easy implementation with current
> oVirt architecture. Any comments from people who might understand better
> oVirt architecture on this use-case?
>
> I think the hosts should rely the least possible on the management server.

my concern is how to make sure engine only starts VMs it should in this 
case.

>
> ------------------------------------------------------------------------
>
>     *De: *"Itamar Heim" <iheim at redhat.com>
>     *Para: *"Adrian Gibanel" <adrian.gibanel at btactic.com>
>     *CC: *"users" <users at ovirt.org>
>     *Enviados: *Viernes, 7 de Diciembre 2012 19:39:26
>     *Asunto: *Re: [Users] Auto-start vms on boot?
>
>     On 12/07/2012 06:23 PM, Adrian Gibanel wrote:
>      > My use case is that I just don't want to start manually the
>     virtual machines when the host starts and, also, if the host is
>     shutdown it should guest-shutdown the virtual machines.
>      >
>      > Any doc on that pin option? How one is supposed to pin a virtual
>     machine to a host?
>
>     just to be clear, we still don't have the behavior i described. I just
>     stated the only use case i'm familiar for a similar requirement.
>     (pinning a VM to host is done via the edit vm dialog).
>
>     question on your use case - how would the engine know if the admin just
>     shutdown a VM manually from a VM which should be auto started
>     (should we
>     add such a checkbox).
>     in the use case i described, we would be adding a 'start/stop VM with
>     host' for a VM pinned to a host.
>
>      >
>      > Thank you.
>      >
>      > ----- Mensaje original -----
>      >
>      >> On 12/06/2012 10:34 PM, Adrian Gibanel wrote:
>      >>> It would seem that oVirt does not provide an standard way of
>      >>> forcing boot of virtual machines at boot.
>      >>>
>      >>> Pools can have pre-started vms as stated here:
>      >>>
>     https://access.redhat.com/knowledge/docs/en-US/Red_Hat_Enterprise_Virtualization/3.1/html/Administration_Guide/Prestarting_Virtual_Machines_in_a_Pool.html
>      >>> but pools imply state-less virtual machines and I am talking more
>      >>> about normal virtual machines.
>      >>>
>      >>> I've found this script:
>      >>>
>      >>> https://github.com/iranzo/rhevm-utils/blob/master/rhev-vm-start.py
>      >>>
>      >>> which could do to the trick if run at host boot.
>      >>>
>      >>> I've also thought (but not tried) to mark a virtual machine as
>      >>> "Highly Available" even if I have only one host (I mean, usually
>      >>> HA only makes sense when you have two hosts).
>      >>>
>      >>> Marking a VM as H.A. would do the trick?
>      >>> Any special reason why there isn't and standard way of marking
>      >>> which vms should be auto-started at boot?
>      >>>
>      >>> Just wanted to hear your thoughts before filling an RFE.
>      >>>
>      >>>
>      >>> Thank you.
>      >>>
>      >> what exactly is your use case?
>      >> the one i'm familiar with is to tie the VM life cycle to a specific
>      >> host, so a VM which is pinned to a specific host for a certain task
>      >> (say, IDS), is always starting when the host starts, and will be
>      >> automatically shutdown when host is moved to maintenance.
>      >> so only relevant for VMs which are pinned to a host.
>
> --
> <http://www.btactic.com/>*Adrián Gibanel*
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