Re: [Libvir] persistent guests (save guest at shutdown and reload it at boot)
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On Mon, Mar 17, 2008 at 03:20:26PM +0100, Matthias Pfafferodt wrote:
Hello,
I added the following entry to the libvirt bugzilla (Bugzilla Bug 437204).
Daniel Veillard ask me to post this to the list for discussion.
Description of problem:
libvirt can save and restore guests. It is also possible to autostart
guest at boot time. I miss a similar option: 'persistent'
booting the host:
* the guest is restored if there is a saved version
* else it is booted
shutdown of the host
* the guest is saved
The xendomain script does something like this. There the 'autostart' option
checks if the domain was saved. If it was this domain is restored else it
is created. At shutdown of the dom0 all running domU's are saved.
That would assume libvirt is always in control of the guest, and that's
not the case, I assume you would be fine by a 'best-effort' kind of
support. This might be doable in libvirtd, assuming it intercepts shudown
properly, and actually has the time to do this. But the elapsed time for
a an xmlDomainSave option can be fairly long (nearly linear with the
size of the memory allocated for the domain), this may slowdown significantly
the shutdown process.
What kind of benefits are you trying to get with this ?
Daniel
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