Docker

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 Certainly! Here are 50 interview questions on Docker:


**Docker Basics:**


1. What is Docker, and how does it differ from traditional virtualization?

2. Explain the components of Docker's client-server architecture.

3. How do you install Docker on different operating systems (Linux, Windows, macOS)?

4. Describe the purpose of the Docker Daemon and Docker Client.

5. What is a Docker container, and how is it different from an image?

6. How do you search for Docker images on Docker Hub?

7. What is Docker Compose, and why is it used?


**Docker Images:**


8. How do you create a Docker image from a Dockerfile?

9. Explain the layers in a Docker image and their significance.

10. How can you tag and version Docker images?

11. Describe the difference between COPY and ADD instructions in a Dockerfile.

12. What is a multi-stage build in Docker, and why is it useful?


**Running Containers:**


13. How do you run a Docker container from an image?

14. Explain the differences between the `docker run` and `docker create` commands.

15. What is the purpose of the `docker exec` command?

16. How can you view the logs of a running Docker container?

17. Describe the use of environment variables in Docker containers.

18. How do you stop and remove Docker containers?

19. What is the difference between stopping and killing a container?

20. How can you restart a Docker container automatically?


**Networking in Docker:**


21. Explain the types of network modes in Docker (bridge, host, overlay, none).

22. How do you create a custom Docker network?

23. What is a container's IP address within a Docker network?

24. Describe port mapping (publishing) in Docker.

25. How can containers communicate with each other using DNS?


**Docker Volumes:**


26. What are Docker volumes, and why are they used?

27. How do you create and manage Docker volumes?

28. Explain the difference between named volumes and host-mounted volumes.

29. What is a bind mount, and how is it different from a volume?


**Docker Registry and Docker Hub:**


30. Describe the purpose of a Docker registry.

31. How do you push a Docker image to Docker Hub?

32. How can you pull a specific image version from Docker Hub?

33. Explain the importance of Docker Hub namespaces and repositories.

34. What is the Docker Trusted Registry (DTR)?


**Docker Security:**


35. How do you scan Docker images for vulnerabilities?

36. Explain Docker's default container isolation using namespaces and cgroups.

37. What are user namespaces in Docker, and how do they enhance security?

38. How can you restrict a container's CPU and memory usage?

39. Describe the purpose of AppArmor and Seccomp profiles in Docker.

40. What is Docker Content Trust (DCT), and how does it enhance image security?


**Docker Compose:**


41. How do you define a multi-container application using Docker Compose?

42. Explain the use of the `docker-compose.yml` file.

43. What is the purpose of services, networks, and volumes in a Compose file?

44. How can you scale services using Docker Compose?

45. Describe the process of building and starting a Compose application.

46. How do you stop and remove Compose services and containers?


**Docker Swarm and Orchestration:**


47. What is Docker Swarm, and how does it facilitate container orchestration?

48. How do you initialize a Docker Swarm cluster?

49. Explain the use of managers and workers in a Swarm cluster.

50. Describe the benefits of using Docker Swarm for high availability and load balancing.


These questions cover various aspects of Docker, from the basics of containerization to advanced topics like orchestration and security.

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