[libvirt-users] virsh dump

Harish Patil patharish at gmail.com
Sat Aug 11 00:28:28 UTC 2012


On Fri, Aug 10, 2012 at 4:45 PM, Eric Blake <eblake at redhat.com> wrote:

> On 08/10/2012 05:31 PM, Harish Patil wrote:
> > Hi
> > I have both host and KVM/QEMU guest VM running linux.
> >
> > Questions:
> > What are the constituents of the virsh dump?
> > -  What all areas does it dumps?
>
> By default, it dumps in the same format needed to migrate a VM from one
> host to another.  As of 0.9.13 and new enough qemu (basically, a feature
> in qemu.git but not released until the upcoming qemu 1.2), you can also
> use 'virsh dump --memory-only' to force a dump to an ELF image instead.
>
> > -  Is it same as taking guest VM's core dump via kexec/kdump?
>
> If you use the --memory-only option, then it is very similar (although
> the dump is performed without guest involvement).  If you want an actual
> kexec/kdump from the guest, then you'll have to have the guest create
> that; it may be worth requesting a qemu-ga guest agent command to
> trigger a guest to dump itself.
>

 [Harish] How can we achieve this and whom do we request for qemu-ga cmd ?
How does it work? Thanks much for your answers.

>
> > -  Does it include QEMU's info to debug qemu-level issues?
>
> No, it is not a core dump of the qemu process itself.
>
> --
> Eric Blake   eblake at redhat.com    +1-919-301-3266
> Libvirt virtualization library http://libvirt.org
>
>
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