Re: [libvirt-users] re-create disk image file
Hi Henrik:
When I tried to copy the file descriptor file a "Stale NFS file handle"
error was generated:
$ cp -f /proc/13196/fd/9 /tmp/guest.img
cp: cannot stat `/proc/13196/fd/9': Stale NFS file handle
I suppose that makes sense because the file was accidently deleted but
from the NFS server perspective it really isn't there. Do you know of
any way to work around it?
Or why not just attach a new disk to the guest and copy stuff inside
the guest?
I understand how that would work to recover individual files/directories
but I don't understand how I would be able to recover the entire image.
Can you explain?
Thanks,
Joe
-----Original Message-----
From: libvirt-users-bounces(a)redhat.com
[mailto:libvirt-users-bounces@redhat.com] On Behalf Of Joe Linoff
Sent: Monday, November 05, 2012 11:55 AM
To: Henrik Ahlgren
Cc: libvirt-users(a)redhat.com
Subject: Re: [libvirt-users] re-create disk image file
Hi Henrik:
Thank you. Both suggestions are excellent.
Have you noticed spam messages from this email list? I have gotten
several in the past couple of days.
Regards,
Joe
-----Original Message-----
From: Henrik Ahlgren [mailto:pablo@seestieto.com]
Sent: Monday, November 05, 2012 11:53 AM
To: Joe Linoff
Cc: libvirt-users(a)redhat.com
Subject: Re: [libvirt-users] re-create disk image file
On Mon, Nov 05, 2012 at 11:03:11AM -0800, Joe Linoff wrote:
I am curious about how to re-create a disk image file from a running
guest when the original disk image file is accidentally deleted. This
came up recently during a test scenario but I couldn't figure out how
to do it.
If you have unlinked the image, but qemu-kvm (or whatever hypervisor you
are running) still has it open, you should be able to to recover it by
going to /proc/PID/fd and looking for a file descriptor number that is a
symlink to your deleted image. Just copy it to a safe place. I would
first run sync inside the guest and maybe suspend it. It would be nice
if you could switch it to single user mode with all filesystems mounted
read-only, but whatever you do, avoid destroying the domain.
Or why not just attach a new disk to the guest and copy stuff inside the
guest?
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