You followed the tutorial. You ran Docker Run. And… nothing. The container exited immediately. Or maybe it is running, but localhost just shows “This site can’t be reached.” We’ve all been there. When you’re new to Docker, a failing container can feel like a sealed black box. You know something is wrong inside, but you have no idea how to look.
In this quick guide, I’ll show you the five essential commands to open that box, see what’s happening, and fix your broken containers.