Proxmox won't boot, stuck in grub

[MarcvsTvllivs]

Hi everybody!

I rebooted my Proxmox sever and instead of Proxmox, I am greeted by Grub not being able to find my LVM...



I read up on others having this issue before, on how to fix grub issues from a liveCD through mounting and chrooting into the incapacitated installation, and on LVMs -- but I am having trouble putting it all together for my setup.

In short, my Proxmox server is on an SSD that has the expected three partitions for Boot, EFI and LVM:



Other than a bunch of VM disks (probably should have been given their own space...), the LVM contains the following:



Now, what exactly do I mount where? The step by step guides I find usually assume a non-LVM setup, and sda1,2,3 numbering, and I am having trouble transferring that to mine.

Any help would be greatly appreciated!

 

[Dunuin]

"/dev/pve/root" is the LV with your root filesystem that you can for example mount in "/altroot" on a live CD to then chroot into "/altroot". You will probably also need to bind-mount the "/sys", "/proc" and "/dev" folders.

 

[MarcvsTvllivs]

"/dev/pve/root" is the LV with your root filesystem that you can for example mount in "/altroot" on a live CD to then chroot into "/altroot". You will probably also need to bind-mount the "/sys", "/proc" and "/dev" folders.

Right, and the EFI I think as well as grub won't install otherwise. How to I configure the newly-installed grub for the LVM situation though?

 

[Dunuin]

Depends on how and which PVE version you initially installed.
As far as I understand since PVE 6.2 or 6.3 even the grub bootloader will be stored on the 2nd EFI partition using the proxmox-boot-tool.
If you for example installed PVE on top of a Debian then the grub bootloader would be on the first grub partition.

So you either would need to write a new grub bootloader with the "grub-install" command or by using the proxmox-boot-tool.
See here: https://pve.proxmox.com/wiki/Host_Bootloader

 

[MarcvsTvllivs]

Thank you. I am post-6.2 so it is the newer version. I did the grub-install but now all I get is the system booting into grub (rather than grub-rescue before) but still not into Proxmox. I will need to read up more on that, but am grateful for any clues.

EDIT: I can boot just fine using a super grub2 disk from a USB thumb drive, loading LVM drivers, and then selecting the Proxmox installation for the next boot. That's a relief, but I don't know how to make this permanent and independent from the thumb drive.