Troubleshooting Questions

Definition

Questions testing your practical ability to use CLI tools to diagnose failing containers, network issues, and build errors.

Explain Like I'm New

Proving you know what to type when the screen goes red.

Real World Example

Question: 'A container starts and then immediately exits with a Status code 137. What does that code mean and how do you investigate it?'

Common Use Cases

•Operational readiness checks

Interview Questions

basic

If a container is failing to boot and restarting infinitely, what is the first command you type to figure out why?

intermediate

Two containers on a custom bridge network cannot ping each other. What command would you use to verify they are actually on the same network?

Flash Cards

Question

First command?

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Answer

`docker logs <container_name>`. The logs will output the application's crash stack trace (e.g., Syntax Error, Database Connection Refused).

Question

Verify network?

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Answer

Use `docker inspect <network_name>`. It outputs a JSON payload listing every single container attached to that specific network. If one is missing, you found the problem.