· debian foss freenas freebsd

VM on bhyve not booting

Last night I installed updates on my FreeNAS box and rebooted it. As expected my network died, but then it never came back, which I hadn’t expected.

My FreeNAS box provides backup storage space, a local Debian mirror and a mirror of talks from recent conferences. It also runs a couple of virtual machines and one of these provides my local DNS resolver.

I hooked up the VNC console to the virtual machine and the problem looked to be that it was booting from the Debian installer CD. I removed the CD from the VM and rebooted, thinking that would be the end of it, but nope:

The EFI shell presented where GRUB should have been

The EFI shell presented where GRUB should have been

I put the installer CD back and booted in “Rescue Mode”. For some reason, the bootloader installation wasn’t working, so I planned to reinstall it. The autopartition layout for Debian with EFI seems to use /dev/sda2 for the root partition. When you choose this it will see that you have an EFI partition and offer to mount it for you too.

When I went to install the bootloader, I saw another option that I didn’t know about: “Force GRUB installation in removable media path”. In the work I did on live-wrapper I had only ever dealt with this method of booting, I didn’t realise that there were other methods. The reasoning behind this option can be found in detail in Debian bug #746662. I also found mjg59’s blog post from 2011 useful in understanding this.

Suffice is to say that this fixed the booting issue for me in this case. I haven’t investigated this much futher so I can’t be certain of any reproducable steps to this problem, but I did also stumble across this forum post which essentially gives the manual steps that are taken by that Rescue Mode option in order to fix the problem. I think the only reason I hadn’t run into this before now is that the VMs hadn’t been rebooted since their installation.


If you would like to contact me with comments, please send me an email.
If you would like to support my free software work, you can donate via PayPal.


This post was syndicated on: