[libvirt] question about guest status
Daniel P. Berrange
berrange at redhat.com
Wed Feb 15 11:00:25 UTC 2012
On Wed, Feb 15, 2012 at 02:44:18PM +0800, Wen Congyang wrote:
> Hi all:
> If the guest runs on xen, we can know the guest OS paniced, and the guest status
> is paniced. But if the guest runs on qemu/kvm, we need the same feature. And the
> feature to know guest-is-panic is a very very good feature for enterprise.
> We have some ways to know that guest has paniced:
> 1. watchdog timeouts
> It is not a good way, because we can not say "the guest is paniced" in 100% accuracy
> 2. use a PV driver(like the XEN)
> The old RHELs do not have such driver...
> It can not work for the second kernel...
> 3. Adding a function for console-logging (in ring buffer or some) and check messages
> given by guests. If we allow some filtering script or some, we can catch Linux's
> panic messages. We can say the guest paniced if we catch such messages. We may be
> able to catch other events by other script
> I prefer to 3 now. Does anyone have a better idea?
I have discussed this with Anthony before and the thought was that QEMU/KVM
should provide some kind of paravirtualized crash notification service to
the guest. ie option 2. such a device would likely be quite simple and
thus possible to backport to older kernels as needed
Option 3 is too much of a unreliable hack IMHO.
|: http://berrange.com -o- http://www.flickr.com/photos/dberrange/ :|
|: http://libvirt.org -o- http://virt-manager.org :|
|: http://autobuild.org -o- http://search.cpan.org/~danberr/ :|
|: http://entangle-photo.org -o- http://live.gnome.org/gtk-vnc :|
More information about the libvir-list