While going through my normal maintenance yesterday I noticed that my Debian virtual machines are behind on 11 and I've decided I'm going to work on upgrading them.

Upgrade PH-02

I decide to start here because it is a redundant server to PH-01 and if I break things there is no great loss.

Steps performed on PH-02

• cat /etc/os-release
  • PRETTY_NAME="Debian GNU/Linux 11 (bullseye)"
• sudo apt-mark showhold
• sudo apt update
• sudo apt upgrade
• sudo apt full-upgrade
• sudo apt autoremove
• sudo nano /etc/apt/sources.list
  • I replace all instances of bullseye with bookworm
• export LC_ALL=C
• sudo apt update
• sudo apt upgrade
• Restart services during package upgrades without asking? Yes

This took close to two hours I believe.

• sudo apt full-upgrade
• sudo apt autoremove
• sudo reboot
• cat /etc/os-release
  • PRETTY_NAME="Debian GNU/Linux 12 (bookworm)"

Well Pi-Hole is still functional on PH-02 and it is responding to DNS requests so I'd say this was a success!