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Re: [fedora-virt] Trying to move VM efficiently, grub-install, guestfish

On 10/29/2009 09:28 PM, Richard W.M. Jones wrote:
On Thu, Oct 29, 2009 at 08:35:58PM +0100, Dennis J. wrote:
but when I issue the "grub-install / /dev/sda" all I get is:
"libguestfs: error: grub_install: grub-install: /dev/sda does not have
any corresponding BIOS drive."

I read the rest of your comment with awe.  All I can say is good luck
with your experiments.

Just about the particular error above .. Is /dev/sda the real name of
the drive?  (Try the list-devices command to list the real device

Success! The problem was that the guest is usually using /dev/vda but I couldn't get guestfish to start with:

[root nexus ~]# guestfish -a /var/lib/libvirt/images/test2.img -m /dev/vg_test/lv_root -m /dev/vda1:/boot
libguestfs: error: mount: mount_stub: /dev/vda1: No such file or directory

Using /dev/sda1 instead lets guestfish start and /boot is mounted properly but grub-install didn't work. What did the trick was changing "/dev/vda" to "/dev/sda" in /boot/grub/device.map followed by a grub-install which now works and then changing the device.map back so I don't get problems when booting up the guest for real.

After that the "new" guest boots up perfectly.

I'm not very familiar with guestfish (yet) so I'm not sure if the /dev/vda1 thing is a bug or simply not supposed to work. The next step would be to automate the whole thing with a script even if it's only useful in some cases (where the guest only really uses a small part of the image).


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