I'm having a tough time getting Docker to function properly behind my UFW firewall. I've come across many discussions about Docker altering iptables, which leads to conflicts with UFW. I'm really hoping there's a way to make them work together smoothly.
For some context, I want to tighten security on my home server that's set up on bare metal. I've got all my other firewall rules set up nicely, but my Docker containers aren't able to communicate with each other when UFW is active.
I've tried using the ufw-docker GitHub project, but it hasn't worked out for me, and I'm pretty new to Docker networking. I suspect there might be something off with how I configured my networks for the containers, but I'm not entirely sure what I'm doing wrong.
4 Answers
It's definitely a hassle trying to make both Docker and UFW work together, but I love both! Just keep in mind that UFW is essentially a frontend for iptables, and Docker modifies iptables too. They don't really coordinate together, so if you want to solve this, you might have to dive into iptables itself or look for a different frontend that works well with Docker.
I use both UFW and Docker without any problems! The key thing is understanding Docker's networking. Docker typically auto-manages its own firewall rules when you run a container, so UFW doesn't usually need to interfere. Just make sure your containers are properly configured on a bridge network or even consider creating a user-defined bridge if you need to connect different services. A solid tutorial on the Docker networking setup could help clarify things for you.
The easiest way to handle this is to avoid using Docker and UFW together if possible. Otherwise, you'll need to really understand how both of them operate together.
To answer your issue: if your containers can't communicate, make sure they're in the same Docker network. I can't see any specifics from your question, which is crucial information.
Check out the Docker documentation on firewalls for more info, and if you're stuck on the ufw-docker GitHub project, it might be worth reaching out there for further assistance.
I'm not so sure about that—if you set up the right ports while starting containers, those ports should still be accessible no matter what UFW rules are active. Just be sure to check your exposed ports and configurations.
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