Docker docs:
Docker routes container traffic in the nat table, which means that packets are diverted before it reaches the INPUT and OUTPUT chains that ufw uses. Packets are routed before the firewall rules can be applied, effectively ignoring your firewall configuration.
So I happened to follow the advice from that Proxmox post, enabled the “Discard” option for the disk and ran
sudo fstrim /within the VM, now the Proxmox LVM-Thin partition is sitting at a comfortable 135Gb out of 377Gb.Think I’m going to use this
fstrimcommand on my main desktop to free up space.I think linux does fstrim oob.
edit: I meant to say linux distros are set up to do that automatically.