What is Docker Swarm and how does it compare to Kubernetes for container orchestration?

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Docker Interview Questions

  1. [JUNIOR] What is Docker and why is it used?
  2. [JUNIOR] What is a Docker container?
  3. [JUNIOR] What is a Docker image and how is it different from a container?
  4. [JUNIOR] What is a Dockerfile?
  5. [JUNIOR] What is the difference between Docker containers and virtual machines?
  6. [MID] What is Docker Compose and what is it used for?
  7. [MID] What is the difference between CMD and ENTRYPOINT in a Dockerfile?
  8. [JUNIOR] What are the main components of Docker architecture?
  9. [JUNIOR] What is Docker Hub?
  10. [MID] What is the difference between COPY and ADD commands in a Dockerfile?
  11. [MID] What are the different types of Docker networks and when would you use each?
  12. [MID] What is the difference between bind mounts and volumes in Docker?
  13. [MID] What is the lifecycle of a Docker container?
  14. [SENIOR] What are Docker multi-stage builds and why are they useful?
  15. [SENIOR] How do you optimize Docker images for production use?
  16. [SENIOR] How does Docker handle container isolation and security?
  17. [JUNIOR] What is the Docker Daemon and what role does it play?
  18. [JUNIOR] What is the purpose of the .dockerignore file?
  19. [JUNIOR] How do you create a Docker container from an image?
  20. [MID] What is the difference between a Docker image and a Docker layer?
  21. [MID] What are the most commonly used instructions in a Dockerfile?
  22. [MID] How do you limit the CPU and memory usage of a Docker container?
  23. [SENIOR] How do you manage secrets in Dockerized applications?
  24. [SENIOR] How do you monitor Docker containers in a production environment?
  25. [SENIOR] How do you handle persistent data in Docker containers across updates?
  26. [SENIOR] How do you implement a CI/CD pipeline using Docker?
  27. [SENIOR] What is Docker Swarm and how does it compare to Kubernetes for container orchestration?
  28. [JUNIOR] What is the difference between Docker Hub and a Docker Registry?
  29. [JUNIOR] How do you list all running Docker containers?
  30. [MID] What is the difference between docker run and docker start?
  31. [MID] What is the difference between docker exec and docker attach?
  32. [MID] What are the differences between the up, run, and start commands of docker-compose?
  33. [MID] What is the difference between Docker restart policies "no", "on-failure", and "always"?
  34. [MID] What is the purpose of the volume parameter in a docker run command?
  35. [SENIOR] How do you scale Docker containers horizontally?
  36. [SENIOR] How do you secure Docker containers in a production environment?
  37. [SENIOR] How does Docker integrate with Kubernetes?
  38. [SENIOR] How do you update a Docker container without losing data?
  39. [EXPERT] What are Docker namespaces and how do they provide container isolation?
  40. [JUNIOR] How do you start, stop, and kill a Docker container?
  41. [JUNIOR] How do you remove an unused Docker image?
  42. [MID] Where are Docker volumes stored in Docker?
  43. [MID] What is the difference between Daemon Level Logging and Container Level Logging in Docker?
  44. [MID] What happens when a Docker container exits and on what circumstances will you lose data?
  45. [SENIOR] What steps would you take to debug issues in a Docker container?
  46. [SENIOR] How do you configure communication between Docker containers on different hosts?
  47. [SENIOR] How would you handle a failed Docker container in a CI/CD pipeline?
  48. [EXPERT] How does Docker use control groups (cgroups) to manage container resources?
  49. [EXPERT] How does Docker Content Trust (DCT) work and why is it important?
  50. [EXPERT] Is it a good practice to run stateful applications on Docker and what are the trade-offs?
  51. [EXPERT] How do you implement load balancing across Docker containers and hosts?
  52. [JUNIOR] What command is used to check the version of Docker client and server?
  53. [MID] Can a paused container be removed from Docker?
  54. [SENIOR] What is the purpose of Docker system prune and when should you use it?
  55. [SENIOR] How will you ensure container 1 runs before container 2 while using docker-compose?
  56. [EXPERT] How does Docker handle service discovery in Swarm mode?
  57. [EXPERT] How does the Docker Daemon and the Docker Client communicate with each other at the protocol level?
  58. [EXPERT] How do you configure Docker to use a custom storage driver?
  59. [JUNIOR] What command can you run to export a Docker image as an archive?
  60. [JUNIOR] What command can be run to import a pre-exported Docker image into another Docker host?
  61. [MID] What are Docker Object Labels and how are they used?
  62. [EXPERT] How do you perform a live migration of Docker containers between hosts?
  63. [EXPERT] What is the purpose of the docker checkpoint command?
  64. [EXPERT] What are the differences between Docker Community Edition (CE) and Docker Enterprise Edition (EE)?