[Engine-devel] Guest Reboot

[Michal Skrivanek]

On Jun 10, 2013, at 21:20 , David Jaša <djasa at redhat.com> wrote:

> Hi Martin,
> 
> there may be more kinds of reboot in context of RHEV: "warm" reboot that
> keeps qemu process intact, or "cold" that would involve qemu process
> termination and start of new one - and this could be done with keeping
> of current configuration, or with applying settings that "take effect
> after reboot" that have changed during VM runtime; and all of these can
> be "soft" - when the guest OS reboots itself and "hard" when you perform
> the reboot right away.
we plan to have 2 of them which seem to make most sense
"warm" without applying config changes and keeping qemu process (i.e. also keeps Run Once,Stateless, pooled VM config/state)
"cold" which kills qemu and is completely driven by Engine, and applies config changes
and a policy option in VM properties to specify whether you should forcibly proceed with reboot/shutdown when graceful methods fail/timeout

is there anything not covered for a typical user? We intentionally don't want to provide all possible options, just those making sense. The feature is about providing a convenient shortcut.

Thanks,
michal

> 
> All of these have their use cases, so it should be documented what will
> you implement, and you may expect somebody asking you to implement the
> rest. ;)
> 
> David
> 
> 
> Martin Betak píše v Pá 07. 06. 2013 v 12:32 -0400:
>> Hi, engine-devel
>> 
>> Customers request the ability to reboot a VM with a single click so I started designing the overall architecture and planing out the required changes to the respective components. 
>> You can find the wiki page for the initial draft at [1] and I would like to ask you for your input on my general design and potential issues that could arise in some corner cases.
>> Please feel free to respond to this thread or add to the Issues section of [1].
>> 
>> Thanks in advance for your opinions :-)
>> 
>> Martin
>> 
>> [1] http://www.ovirt.org/Features/Guest_Reboot
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> 
> -- 
> 
> David Jaša, RHCE
> 
> SPICE QE based in Brno
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