Docker MCQs – Advanced Docker Concepts

Advanced Docker concepts are essential for developers and DevOps engineers to master as they delve deeper into containerization. Topics like Docker Swarm, Kubernetes integration, advanced networking, multi-stage builds, and Docker security highlight the true potential of Docker in production environments.

These MCQs help you prepare for high-level interview questions and real-world production scenarios, solidifying your skills in advanced Docker usage.

1.) What is Docker Swarm?

A) Docker’s native clustering and orchestration tool
B) A feature for securing Docker containers
C) A Kubernetes alternative for managing containers
D) A tool for building multi-stage images

Answer: Option A

Explanation: Docker Swarm is Docker’s native clustering and orchestration tool, used for managing and scaling containerized applications.

2.) What is a multi-stage build in Docker?

A) A process of chaining multiple containers together
B) A method to create multiple images from a single Dockerfile
C) A technique to reduce image size by separating build and runtime stages
D) A strategy for container scaling

Answer: Option C

Explanation: Multi-stage builds help reduce image size by separating build and runtime stages within a single Dockerfile.

3.) Which of the following is NOT an advantage of multi-stage builds?

A) Reduces the final image size
B) Improves build performance
C) Simplifies build pipelines
D) Enables real-time container monitoring

Answer: Option D

Explanation: Multi-stage builds do not provide real-time monitoring; their purpose is to optimize the image size and simplify the build process.

4.) What is the purpose of the docker stack deploy command?

A) To deploy a stack of containers
B) To deploy services in a Docker Swarm cluster
C) To create a multi-stage Dockerfile
D) To initialize Docker networking

Answer: Option B

Explanation: The docker stack deploy command is used to deploy and manage services in a Docker Swarm cluster.

5.) Which feature in Docker provides secure image signing and verification?

A) Docker Security Scanner
B) Content Trust
C) Docker Shield
D) Image Lock

Answer: Option B

Explanation: Docker Content Trust (DCT) allows secure image signing and verification, ensuring trusted image sources.

6.) What is the default storage driver for Docker on Linux?

A) OverlayFS
B) AUFS
C) Device Mapper
D) Btrfs

Answer: Option A

Explanation: OverlayFS is the default storage driver for Docker on most Linux distributions.

7.) What does the docker secret command manage in a Docker Swarm?

A) Multi-stage build configurations
B) API keys for Kubernetes
C) TLS certificates
D) Encrypted secrets for services

Answer: Option D

Explanation: The docker secret command is used to manage encrypted secrets, such as passwords or tokens, for services in a Docker Swarm.

8.) Which command enables experimental features in Docker?

A) docker experimental on
B) docker features enable
C) Add “experimental”: “enabled” to ~/.docker/config.json
D) docker beta activate

Answer: Option C

Explanation: Adding “experimental”: “enabled” to the Docker configuration file enables experimental features.

9.) What is the purpose of the docker system prune command?

A) To remove unused images, containers, and networks
B) To optimize container resource usage
C) To reset the Docker daemon
D) To clean up unused volumes only

Answer: Option A

Explanation: The docker system prune command removes all unused containers, images, networks, and optionally, volumes.

10.) What is the role of docker-compose.override.yml?

A) To override the default Compose configuration
B) To define advanced networking rules
C) To manage Docker security policies
D) To configure Docker secrets

Answer: Option A

Explanation: The docker-compose.override.yml file is used to override or extend the default Compose configuration in docker-compose.yml.

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