Docker Quiz Test Online (30 random Questions) 2026

This quick 30-minute challenge consists of 30 random multiple-choice questions that test your knowledge across various Docker topics, including the introduction to Docker, installation procedures, Docker images and containers, networking, Docker Compose, advanced concepts, deployment in production, security, and integration with CI/CD pipelines. Whether you’re a beginner or have some experience, this quiz is designed to enhance your understanding of Docker’s capabilities in modern software development.

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30 Minutes Docker Quiz Test Online

Welcome to the Docker Quiz! This quick 30-minute challenge consists of 30 random multiple-choice questions that test your knowledge across various Docker topics, including the introduction to Docker, installation procedures, Docker images and containers, networking, Docker Compose, advanced concepts, deployment in production, security, and integration with CI/CD pipelines. Whether you're a beginner or have some experience, this quiz is designed to enhance your understanding of Docker's capabilities in modern software development.

1 / 30

1. What does the docker checkpoint feature do?

A) Creates a backup of a container's state

B) Monitors resource usage of a container

C) Creates a snapshot of a container's runtime state

D) Restarts a container automatically

2 / 30

2. How do you execute a command inside a running container managed by Docker Compose?

A) docker-compose exec

B) docker exec

C) docker attach

D) docker-compose run

3 / 30

3. What is the purpose of the restart key in Docker Compose?

A) To automatically rebuild the container

B) To define the restart policy for containers

C) To enable scaling of services

D) To restart the Docker service

4 / 30

4. How do you export a Docker image to a file?

A) docker save

B) docker tar

C) docker push

D) docker export

5 / 30

5. What does the EXPOSE instruction in a Dockerfile do?

A) Specifies the ports the container listens on

B) Publishes a port to the host machine

C) Maps container ports to host ports

D) Opens all container ports

6 / 30

6. What happens if you try to remove a running container?

A) The container is forcefully stopped and removed.

B) The container is removed without stopping it.

C) Docker archives the container.

D) Docker throws an error.

7 / 30

7. Which command enables experimental features in Docker?

A) docker features enable

B) docker experimental on

C) docker beta activate

D) Add "experimental": "enabled" to ~/.docker/config.json

8 / 30

8. What is a Docker container?

A) A runtime instance of a Docker image

B) A virtual machine

C) A tool for building Docker images

D) A Docker registry

9 / 30

9. What is the service key used for in a docker-compose.yml file?

A) To link containers

B) To configure environment variables

C) To specify individual services in the Compose setup

D) To define container networking

10 / 30

10. What happens if Docker is installed on a system without enough disk space?

A) Docker will refuse to install.

B) Docker will prompt for manual disk space allocation.

C) Docker will disable image caching.

D) Docker will install but fail to run containers.

11 / 30

11. How can you optimize Docker images for production use?

A) Include all debugging tools in the image

B) Avoid specifying a base image

C) Use apt-get install commands directly in the Dockerfile

D) Use multi-stage builds and minimal base images

12 / 30

12. What is the purpose of Docker Bench for Security?

A) To encrypt container data

B) To automate container deployments

C) To monitor container resource usage

D) To evaluate Docker installations against security best practices

13 / 30

13. How do you forcefully remove a running container?

A) docker remove --force <container-id>

B) docker stop <container-id>

C) docker terminate <container-id>

D) docker rm -f <container-id>

14 / 30

14. What is the function of the --no-new-privileges flag?

A) Prevents a container from gaining additional privileges

B) Disables network access for the container

C) Prevents the container from being restarted

D) Restricts the container's memory usage

15 / 30

15. What happens to a container if it is stopped and not removed?

A) It is automatically deleted.

B) It remains on the system and can be restarted.

C) It cannot be restarted.

D) It is moved to an archive.

16 / 30

16. What is the primary purpose of the CMD instruction in a Dockerfile?

A) CMD provides default commands

B) CMD defines executable instructions

C) CMD is for environment variables

D) CMD sets the base image

17 / 30

17. What is a multi-stage build in Docker?

A) Using multiple base images in a single Dockerfile

B) Optimizing Docker images by using intermediate stages to reduce image size

C) Building multiple containers simultaneously

D) Running multiple containers in parallel

18 / 30

18. Which command optimizes the size of a Docker image by removing intermediate layers?

A) docker build --squash

B) docker optimize

C) docker image clean

D) docker prune

19 / 30

19. Why should you use minimal base images like alpine?

A) To ensure compatibility with all applications

B) To minimize the attack surface

C) To reduce image build time

D) To avoid multi-stage builds

20 / 30

20. How do you remove orphaned containers created by Docker Compose?

A) docker-compose rm -orphans

B) docker-compose down --remove-orphans

C) docker-compose prune

D) docker-compose clean

21 / 30

21. How do you specify a custom subnet when creating a Docker network?

A) docker network create --subnet=<subnet>

B) docker network create --mask=<subnet>

C) docker network create --ip-range=<subnet>

D) docker network create --cidr=<subnet>

22 / 30

22. Which protocol is primarily used by Docker for container communication?

A) UDP

B) HTTP

C) TCP

D) IP

23 / 30

23. What is the primary purpose of the ENTRYPOINT instruction in a Dockerfile?

A) ENTRYPOINT is for environment variables

B) ENTRYPOINT provides default commands

C) ENTRYPOINT defines executable instructions

D) ENTRYPOINT sets the base image

24 / 30

24. How do you enable Docker Swarm mode?

A) docker swarm init

B) docker swarm create

C) docker mode activate

D) docker cluster enable

25 / 30

25. Which command displays container resource usage statistics?

A) docker stats

B) docker inspect

C) docker logs

D) docker monitor

26 / 30

26. What does the term "containerized CI/CD" mean?

A) Running CI/CD processes inside Docker containers

B) Deploying containers without testing

C) Avoiding orchestration tools

D) Automating code commits

27 / 30

27. What is Docker Swarm?

A) A tool for building multi-stage images

B) Docker's native clustering and orchestration tool

C) A Kubernetes alternative for managing containers

D) A feature for securing Docker containers

28 / 30

28. How do you stop a running Docker container?

A) docker end <container-id>

B) docker terminate <container-id>

C) docker pause <container-id>

D) docker stop <container-id>

29 / 30

29. What is the size of the default Docker Desktop installation?

A) ~200 MB

B) ~400 MB

C) ~1 GB

D) ~2 GB

30 / 30

30. Which of the following is NOT a recommended security practice for Docker?

A) Limit container privileges using --cap-drop

B) Store secrets in environment variables

C) Regularly update Docker images

D) Use a minimal base image

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