When Something Breaks: Common Errors and How to Read Them

Errors are a normal part of the work — even for experts. The good news: Docker almost always tells you exactly what went wrong, if you just read the message. In this lesson we learn to read error messages without panic, and meet the three or four errors you will hit most in daily work, along with th

An error message is like a labeled warning light in a car: it does not say 'broken', it says 'here is what to check'. You read it, understand it, fix it.

error message: The text Docker prints when an action fails. It almost always describes the problem in words — worth reading to the end before searching online.
port already in use: An error saying the host port you requested is already used by another process. The fix: choose a different host port, or stop whatever is using it.
docker logs: A command that shows what a container printed (stdout/stderr). It is the first check when a container fails or exits without explanation.