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Docker Interview Questions: From Basic to Advanced

This list of Docker interview questions covers a wide range of topics, from basic concepts to advanced features and best practices. It is organized into three categories: basic, intermediate, and advanced, to help you focus your preparation on the right level of difficulty. Whether you are just starting out with Docker or have extensive experience with containerization, this list has something for everyone. Use it to brush up on your knowledge, test your skills, and prepare for your next Docker interview.

Basic

  • What is Docker and what is it used for?
  • How does Docker differ from a virtual machine?
  • Can you explain the architecture of Docker?
  • What is a Docker image and how is it different from a Docker container?
  • How do you create a Docker container?
  • Can you explain the difference between a Docker image and a Docker container?

Intermediate

  • How do you manage Docker containers?
  • Can you explain the difference between the Docker CLI and the Docker Engine?
  • How do you create a Dockerfile and what is it used for?
  • Can you explain the difference between a "Dockerized" application and a "non-Dockerized" application?
  • How do you share a Docker image?
  • Can you explain how networking works in Docker?

Advanced

  • Can you explain how volumes work in Docker?
  • How do you troubleshoot issues with Docker containers?
  • Can you explain how Docker Swarm works and how it differs from Kubernetes?
  • How do you secure a Docker container?
  • Can you explain how you would deploy a multi-container application using Docker Compose?
  • How do you optimize the performance of Docker containers?

Additional

  • Can you explain how to set environment variables in a Docker container?
  • How do you persist data in Docker containers?
  • Can you explain how to use Docker for CI/CD (Continuous Integration/Continuous Deployment)?
  • How do you handle log management in Docker?
  • Can you explain how to use Docker for testing, both at the unit and integration level?
  • How do you use Docker for local development?
  • Can you explain the difference between the Docker Hub and the Docker Store?
  • How do you use Docker in a production environment?
  • Can you explain the difference between Docker Compose and Docker Stack?
  • How do you use Docker in a cloud environment, such as AWS or GCP?
  • Can you explain the difference between Docker CE (Community Edition) and Docker EE (Enterprise Edition)?
  • How do you use Docker in a microservices architecture?
  • Can you explain the role of a Docker registry in the Docker ecosystem?
  • How do you use Docker for container orchestration?
  • Can you explain the difference between Docker Compose and Docker Machine?
  • How do you use Docker to build and deploy serverless applications?
  • Can you explain how to use Docker to build and manage a multi-node cluster?
  • How do you use Docker for continuous delivery and deployment?
  • Can you explain how to use Docker for automated testing and deployment?
  • How do you use Docker to build and deploy containerized applications on a Kubernetes cluster?