I have a running fedora 33 system that boots using EFI.
To test how to migrate (relocate) a system from hardware to VM I have done a clonezilla backup then did a restore of that image into my VM, but am having a boot problem.
When I try to boot from the installed image virtual HDD I get a black screen that hangs.
I can easily boot the from the live image and I verified the data was all restored properly but it just won’t boot from the disk.
I suspect the issue is the boot mode, since I am using QEMU/KVM vmm which I think only boots with MBR mode but the image was of an EFI booting machine.
So far I have tried (in a chrooted system)
- reinstalling the latest kernel
- running grub2-mkconfig twice, once with the output to /boot/efi/EFI/fedora/grub.cfg and once with the output to /boot/grub2/grub.cfg
- running dracut to recreate the initramfs file. I had to reinstall the 5.8.15 kernel used by the live image in order to use dracut.
- generated new UUIDs for each file system just in case the original which was copied from the original install interfered, then made the appropriate changes in /etc/fstab.
Nothing so far gets past the hang seen above.
I have no clue on how to switch the boot mode from EFI to MBR so I am stuck. A reinstall in MBR mode would negate a satisfactory migration from metal to VM.
I have also tried the same with VirtualBox but although I could get it to boot clonezilla I could not get VB to recognize the USB containing the image so I could not do the restore and that test was not successful either.
A couple of things:
- QEMU does support EFI. You just need to select the appropriate ovmf.
- If you want to convert from EFI–>BIOS/Legacy, you need to do at least two things(there may be more):
- You need to add the boot flag to the device you are trying to boot off of
- You need to reinstall grub. Regenerating the config is not sufficient
If you are using virt-manager, here is how you change to EFI:
I am using the virt-manager but I cannot seem to get to where i can alter the hypervisor. This is the only place I can even see info about the hypervisor.
Guide me to that screen you show please.
And I really do not want to switch to legacy, I want to be able to boot the system as it was when I made the image.
That is the place. However, I think you can only modify when you create the VM.
You can always recreate it and attach the existing disk.
I am not sure the difference between yours and mine, but with F33 I seem to be totally unable to select between bios and efi in the VM. I have tried creating a new machine, booting from the live iso which has efi capability, but it still is locked into bios mode. The same with the clonezilla image which has efi support.
I also did a full uninstall of libvirt-* and virt-*, followed by a reboot, then reinstall of the same, with no changes in behavior.
Are you on F33 or F34?. There may be a difference there.
I am on F34 but I am fairly certain it worked the same way on F33.
The sequence is this
- create a new VM
- select one of the generic profiles, like “Generic Linux 2020”.
- at the end click the box that says something like “Customize configuration before install”
- make the changes before you pick, “Begin Installation”
That was the part I was not finding. The “customize configuration before install” check box.
Thank you very much.
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