How would you answer an interview scenario involving Docker containers?

For an interview scenario involving Docker containers, I would first clarify the business goal, scale, constraints, and the failure or quality attribute the interviewer wants to explore. A Docker container is a running instance of an image with isolated processes, filesystem layers, networking, and resource controls. In this scenario, a container works initially but slowly accumulates files and configuration changes. Explain how you would redesign it for immutable operation. I would then explain the main alternatives and tradeoffs, identify likely failure modes, and describe how I would validate the solution through testing, observability, security controls, and recovery or rollback planning.