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.
It’s been about a day since this issue and now I’ve been keeping a close eye on my local-lvm, it fills fast, like, ridiculously fast and I’ve been having to run sudo fstrim / inside the VM just to keep it maintained. I’m finding it weird I’m now just noticing this as this server has been running for months!
For now I edited my /etc/bash.bashrc so whenever I ssh in it’ll automatically run sudo fstrim /, there is something I’m likely missing but this works as a temporary solution.