Proxmox
Post install scripts
From https://tteck.github.io/Proxmox/:
bash -c "$(wget -qLO - https://github.com/tteck/Proxmox/raw/main/misc/post-pve-install.sh)"
Removing the subscription nag
https://github.com/foundObjects/pve-nag-buster
Other hints and reminders
Slow boot times on containers? Change IPv6 to SLAAC.
Resolve error: You have not turned on protection against thin pools running out of space.
I found this article very helpful in further automating vm creation with cloudinit.