Docker MCQ Questions with answers and solutions Page 15

Q. What is the purpose of the 'docker pull' command?

(A) To download an image from a Docker registry
(B) To create a new image from a Dockerfile
(C) To push an image to a Docker registry
(D) To remove an image from the local machine

💬 Discuss

✅ Correct Answer: (A) To download an image from a Docker registry

Explanation: 'docker pull' is used to download an image from a registry like Docker Hub.

Published by Admin ⭐ 38.37K Points at 13-Feb-2025 10:01 pm in Docker

Q. Which Docker command would you use to enter an interactive shell inside a running container?

(A) docker exec -it
(B) docker run -it
(C) docker enter -it
(D) docker start -i

💬 Discuss

✅ Correct Answer: (A) docker exec -it

Explanation: 'docker exec -it' is used to run an interactive shell inside a running container.

Published by Praveen Singh ⭐ 36.81K Points at 13-Feb-2025 10:01 pm in Docker

Q. What is Docker Swarm?

(A) A system for managing and orchestrating multi-container applications
(B) A networking tool for containers
(C) A Docker container image
(D) A tool for building Docker images

💬 Discuss

✅ Correct Answer: (A) A system for managing and orchestrating multi-container applications

Explanation: Docker Swarm is a native clustering and orchestration tool for Docker, allowing for the management of multi-container applications across multiple Docker hosts.

Published by Ranjeet ⭐ 34.60K Points at 13-Feb-2025 10:01 pm in Docker

Q. How do you forcefully remove a running container?

(A) docker rm -f
(B) docker stop -f
(C) docker remove -f
(D) docker kill

💬 Discuss

✅ Correct Answer: (A) docker rm -f

Explanation: 'docker rm -f' forces the removal of a running container.

Published by Admin ⭐ 38.37K Points at 13-Feb-2025 10:01 pm in Docker

Q. What is the purpose of the 'EXPOSE' instruction in a Dockerfile?

(A) To publish a container's port to the host
(B) To specify which ports the container will listen on
(C) To open a firewall port
(D) To map a container port to a host port

💬 Discuss

✅ Correct Answer: (B) To specify which ports the container will listen on

Explanation: The 'EXPOSE' instruction in a Dockerfile informs Docker that the container listens on the specified network ports at runtime. It does not publish the port to the host.

Published by Rakesh Kumar ⭐ 28.44K Points at 13-Feb-2025 10:01 pm in Docker

Q. Which command is used to view logs of a Docker container?

(A) docker logs
(B) docker view
(C) docker history
(D) docker inspect

💬 Discuss

✅ Correct Answer: (A) docker logs

Explanation: The 'docker logs' command is used to fetch the logs of a container. Use 'docker logs <container_id>' to view the logs.

Published by Gopal Sharma ⭐ 38.32K Points at 13-Feb-2025 10:01 pm in Docker

Q. What is the purpose of Docker volumes?

(A) To store Docker images
(B) To persist data generated by Docker containers
(C) To manage Docker networks
(D) To monitor Docker containers

💬 Discuss

✅ Correct Answer: (B) To persist data generated by Docker containers

Explanation: Docker volumes are used to persist data generated by and used by Docker containers, even after the container is deleted.

Published by Vikash Gupta ⭐ 33.56K Points at 13-Feb-2025 10:01 pm in Docker

Q. Which command is used to stop a running Docker container?

(A) docker halt
(B) docker stop
(C) docker kill
(D) docker pause

💬 Discuss

✅ Correct Answer: (B) docker stop

Explanation: The 'docker stop' command gracefully stops a running container by sending a SIGTERM signal. Use 'docker stop <container_id>'.

Published by Gopal Sharma ⭐ 38.32K Points at 13-Feb-2025 10:01 pm in Docker

Q. What is the purpose of the 'ENTRYPOINT' instruction in a Dockerfile?

(A) To define the default command for the container
(B) To specify environment variables
(C) To set the working directory
(D) To expose network ports

💬 Discuss

✅ Correct Answer: (A) To define the default command for the container

Explanation: The 'ENTRYPOINT' instruction in a Dockerfile defines the default command that will be executed when the container starts.

Published by Admin ⭐ 38.37K Points at 13-Feb-2025 10:01 pm in Docker

Q. Which command is used to remove all stopped containers?

(A) docker rm -f
(B) docker prune
(C) docker clean
(D) docker rm $(docker ps -a -q)

💬 Discuss

✅ Correct Answer: (D) docker rm $(docker ps -a -q)

Explanation: The command 'docker rm $(docker ps -a -q)' removes all stopped containers by listing all container IDs and passing them to 'docker rm'.

Published by Shiva Ram ⭐ 30.44K Points at 13-Feb-2025 10:01 pm in Docker

Docker MCQs with answers Page - 15

Q. What is the purpose of the 'docker pull' command?

Q. Which Docker command would you use to enter an interactive shell inside a running container?

Q. What is Docker Swarm?

Q. How do you forcefully remove a running container?

Q. What is the purpose of the 'EXPOSE' instruction in a Dockerfile?

Q. Which command is used to view logs of a Docker container?

Q. What is the purpose of Docker volumes?

Q. Which command is used to stop a running Docker container?

Q. What is the purpose of the 'ENTRYPOINT' instruction in a Dockerfile?

Q. Which command is used to remove all stopped containers?

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