[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Qemu-devel] Qemu Booting a PC without an MBR?
From: |
Richard W.M. Jones |
Subject: |
Re: [Qemu-devel] Qemu Booting a PC without an MBR? |
Date: |
Mon, 2 Sep 2013 13:59:07 +0100 |
User-agent: |
Mutt/1.5.20 (2009-12-10) |
On Fri, Aug 30, 2013 at 08:28:29AM +0200, Peter Lieven wrote:
> Hi all,
>
> today I had the second incidence of a migrated system (copied with
> DD) to qemu which won't boot. (stuck after booting from harddisk
> message).
You should probably have looked at virt-v2v, but you are where you are
now, so ...
> Looking at sector 0 I found out that it does not have an MBR. It seems that
> real hardware and
> I was told also vmware can cope with this.
>
> Is there a way we can improve this? (maybe be using an open source mbr in
> case the mbr
> section is zeroed out?)
(1) Use virt-rescue to open the disk image and then run whatever
program is needed inside the guest (eg. grub-install).
Or:
(2) Use guestfish and add a syslinux boot loader. I don't have a
direct example you can copy, but you could greatly simplify this:
https://rwmj.wordpress.com/2013/05/09/tip-convert-a-windows-dvd-iso-to-a-bootable-usb-key-using-guestfish/
It'll probably be something like:
Write a /tmp/syslinux cfg file (see EXTLINUX docs).
guestfish -a disk.img
><fs> upload /usr/share/syslinux/mbr.bin /dev/sda
><fs> mount /dev/sda1 /
><fs> extlinux /
><fs> upload /tmp/syslinux.cfg /syslinux.cfg
Rich.
--
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
virt-top is 'top' for virtual machines. Tiny program with many
powerful monitoring features, net stats, disk stats, logging, etc.
http://people.redhat.com/~rjones/virt-top
- Re: [Qemu-devel] Qemu Booting a PC without an MBR?,
Richard W.M. Jones <=