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.
I mean if you’re hosting anything publicly, you really should have a dedicated firewall
Do you mean a hardware firewall?
Basically yeah, though I didn’t specify hardware because of how often virtualization is done now
The VPS I’m using unfortunately doesn’t offer an external firewall