Upgrade Proxmox 7 to 8

Prerequisites

• Upgrade to the latest version of Proxmox VE 7.4
  • Ensure web UI > Repositories in pve-manager is at least version 7.4-15
• Valid and test backups for all VM’s and containers (good general rule for all time)
• At least 5GB of free disk space on the root mount point

Upgrade

📌 Utilize the pve7to8 checklist program (with the --full option) to provide hints and warnings about potential issues before and during the upgrade process

Update the configured APT repos and ensure system is on the latest package versions:

apt update
apt dist-upgrade
pveversion

The pveversion should display a value of at least 7.4-15 or newer!

Update the Debian base repo and Proxmox VE 8 Package repo:

• Debian base repo update to Bookworm

sed -i 's/bullseye/bookworm/g' /etc/apt/sources.list

• Proxmox VE 8 Package repo

sed -i -e 's/bullseye/bookworm/g' /etc/apt/sources.list.d/pve-install-repo.list

• For Enteprise subscriptions, do the following for repo updates

sed -i -e 's/bullseye/bookworm/g' /etc/apt/sources.list.d/pve-enterprise.list

After performing the above actions, refresh the repo package index:

apt update

Upgrade the system to Debian Bookworm and Proxmox VE 8.0:

apt dist-upgrade

Check result and reboot into updated Kernel:

• Use the provided pve7to8 –full checklist command

pve7to8 --full

If the checklist returned any issues, you’ll be able to correct/fix them before moving on.

• Reboot system

shutdown -r now

Once everything has rebooted, login to your upgraded Proxmox VE 8.0 management console and confirm your environment/configurations!