I'm struggling to get Docker working properly behind my UFW firewall. I've read that Docker alters iptables, which can conflict with UFW, but I hope there's a way to make it all work together. My main goal is to enhance the security of my home server, which is set up bare metal. While most of my UFW rules are functioning like I want, my Docker containers can't communicate with each other when the firewall is enabled. I've tried the ufw-docker GitHub project, but it hasn't worked for me. Since I'm still new to Docker networking, I suspect I might have made a mistake with my network configurations, but I'm not sure where to begin.
3 Answers
Using Docker and UFW together can be tricky since they both modify iptables and don't really communicate with each other. You might want to check if your containers are on a shared Docker network. If they aren't, they won't be able to talk. If the ufw-docker project isn't working for you, check their GitHub discussions for help, or consider learning iptables directly for finer control.
UFW mainly serves as a frontend for iptables, and Docker manages its own iptables rules. I’ve had UFW running together with Docker smoothly; just make sure your containers are properly configured to communicate over the network. If you're exposing ports in Docker, they should be accessible regardless of UFW, so check your Docker networking to find the problem!
It's definitely a hassle to get both Docker and UFW working without issues. UFW manages iptables, and so does Docker, which can lead to conflicts. In my experience, you don’t have to change UFW settings for your containers; Docker should handle it. It sounds like you might be facing setup issues with your networks. A simple tutorial on Docker networking would be super helpful to iron out these kinks.
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