Docker Interview Questions & Assessment
Assess containerization skills including Dockerfiles, multi-stage builds, Docker Compose, container security, and networking.
Why Docker Matters
Containers are the standard for modern deployment. Docker skills are expected for most backend and DevOps roles.
Sample Interview Questions
Explain Docker layers and the build cache. How would you optimize a Dockerfile?
What is the difference between CMD and ENTRYPOINT? When would you use each?
Design a multi-stage Dockerfile for a Node.js application.
How would you debug a container that keeps crashing on startup?
Explain container networking. How do bridge, host, and overlay networks differ?
How to Prepare
Understand images vs containers at a fundamental level
Master Dockerfile best practices: ordering, caching, multi-stage builds
Practice with Docker Compose for multi-container development
Know container security: non-root users, read-only filesystems, scanning
Understand how containers work: namespaces, cgroups, overlay fs
Related Skills
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