zlacker

>>todsac+(OP)
Docker has a known security issue with port exposure in that it punches holes through the firewall without asking your permission, see https://github.com/moby/moby/issues/4737

I usually expose ports like `127.0.0.1:1234:1234` instead of `1234:1234`. As far as I understand, it still punches holes this way but to access the container, an attacker would need to get a packet routed to the host with a spoofed IP SRC set to `127.0.0.1`. All other solutions that are better seem to be much more involved.

>>smarx0+P4
Tbh I prefer not exposing any ports directly, and then throwing Tailscale on the network used by docker. This automatically protects everything behind a private network too.

>>aaomid+z7
Important to note that, even if you use Tailscale, the firewall punching happens regardless, so you still have to make sure you either:

1. Have some external firewall outside of the Docker host blocking the port

2. Explicitly tell Docker to bind to the Tailscale IP only