I wanted to upgrade my Proxmox VE (https://www.proxmox.com) Server from version 6 to version 7. But I did not want to do this without a Plan B, a fail back plan. For this I used GRUB and efibootmgr. I converted a small swap partition into a bootable Linux partition and pivoted the Version 6 to Version 7. When I noticed that things did not work as expected, I was able to revert to version 6 in less than a minute using GRUB, UEFI Bios and efibootmgr.

The blog version is here: https://www.onemarcfifty.com/blog/vid...

YouTube:    / onemarcfifty  
Twitter:   / onemarcfifty  
Discord:   / discord  
Github: https://github.com/onemarcfifty
Patreon:   / onemarcfifty  
Blog: https://www.onemarcfifty.com


0:00 What's in this video ?
0:38 System overview (before) and THE PLAN
1:53 Considerations when upgrading a server
3:22 The disk and Volume mayout
5:00 Turn a swap volume into a bootable Linux Volume
7:20 How does UEFI Boot work ?
8:55 Update EFI Boot settings
12:03 update GRUB
13:00 Quick Summary
15:00 Shrink the original Volume
16:07 Creating the new Volume
17:10 Upgrade Proxmox (finally!)
17:42 Reverting back to Version 6
19:04 Some Cleanup