I've been having a bit of a puzzler with my Debian and Ubuntu containers—they just can't seem to access the internet. Whenever I try to run 'apt update', it times out. This is particularly strange because my Alpine containers are working perfectly fine; I can run 'apk update' and even ping without issues. I've spent an entire day troubleshooting without any luck. My setup involves a Debian server that's customized for a corporate network, where I've made changes to the IP, gateway, and DNS settings. If Alpine can connect flawlessly, why can't my Debian containers? I've tested both Docker and Podman (in rootless mode), but the problem persists. Also, if anyone has a Debian image that includes network tools, I'm interested!
3 Answers
It sounds like you might need to share your Docker run command or Docker Compose file. The fact that Alpine works while Debian doesn't suggests that there could be something specific to your configuration. It's unlikely that this is a host or Docker issue; it feels more like an image or container configuration problem. If you need a Debian image with network tools, building your own is super easy! Just create a new Dockerfile, use a base image, and run an installation command.
Are you running Docker on a Debian server, or is there something else going on? You might want to try using the host network mode with the command `docker run --rm -it --net host --name trixietest debian:trixie-slim` and then see if you can ping or run 'apt update'. For troubleshooting network issues, you could also use the nicolaka/netshoot image to help isolate the problem.
Have you really checked if your containers have internet connectivity? Try pinging a public IP or resolving a public domain name. Since your setup is customized, it might be a good idea to consult with your corporate IT department about any potential network restrictions that could be in place. And regarding that Debian image with network tools—it's really straightforward to build one yourself!
I appreciate it! Just looking for something pre-made since I don't have the ability to build it on another setup right now.
Thanks for the tip! I'll consider building my own image if I can't find a ready-made one.