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Docker Interview Questions

1. What is the difference between CMD and ENTRYPOINT in a Dockerfile?

Ans: CMD in Dockerfile Instruction is used to execute a command in a Running container, There should be one CMD in a Dockerfile.

ENTRYPOINT in Dockerfile Instruction is used you to configure a container that you can run as an executable.

2. Tell us about the steps for the Docker container life cycle.

Here are the steps with relevant commands:

  • Create container: docker create — name <container-name> <image-name>
  • Run docker container: docker run -it -d — name <container-name> <image-name> bash
  • Pause container: docker pause <container-id/name>
  • Unpause container: docker unpause <container-id/name>
  • Start container: docker start <container-id/name>
  • Stop container: docker stop <container-id/name>
  • Restart container: docker restart <container-id/name>
  • Kill container: docker kill <container-id/name>
  • Destroy container: docker rm <container-id/name>