I'm having some issues with my ITZG Docker image setup after recently updating the Docker engine. I've been running three servers for about a year now: one heavily modded server (port 25565), a vanilla server (port 25568), and a testing server (port 25569). Each server has its own domain name configured through Cloudflare, linking to the public IP and respective ports.
Everything was working fine until I decided to reinstall Docker to fix a restart policy issue. Since then, I can connect to my servers locally, but I can't access them remotely using the domain names.
Before the update, I had set up UFW to allow traffic on those ports, and I've read that Docker uses iptables for network settings, which I haven't modified. Could this be causing the issue? I'm really puzzled since nothing else changed with my setup, and I'm looking for any guidance on what might be wrong.
2 Answers
First off, have you checked what version of the Docker engine you were running before the update? Also, are you using a `:latest` tag for your images, or are they pinned to a specific version? It's important to know if they updated alongside your Docker engine.
Make sure your containers are running properly. A quick `docker ps` should show you their status. If Docker configured the networking for you, you might want to check if it’s behaving as expected with `docker network ls`. And as a test, you could try reconfiguring UFW to see if that changes anything. Remember, things rarely stay the same, so keep an eye on those small details.
If you can connect locally but not remotely, it could indeed be a firewall issue or a misconfiguration in Docker's networking. Make sure your port forwarding settings in the router are still correct after the Docker update. It sounds like you did everything right with UFW, but disabling it and seeing no change might indicate that the problem lies elsewhere. Go through your Docker network settings again, and verify that your public IP is properly routed to your containers. Sometimes a simple oversight can lead to frustrating issues like this.
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