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. Which key in the docker-compose.yml file is used to specify dependencies between services?

A) links

B) volumes

C) depends_on

D) networks

2 / 30

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

A) AUFS

B) Device Mapper

C) Btrfs

D) OverlayFS

3 / 30

3. How do you view the layers of a Docker image?

A) docker layers

B) docker logs

C) docker history

D) docker inspect

4 / 30

4. Which command lists the logs of all services in Docker Compose?

A) docker-compose events

B) docker-compose show

C) docker-compose status

D) docker-compose logs

5 / 30

5. Which command is used to pull a Docker image in a CI/CD pipeline?

A) docker pull

B) docker build

C) docker run

D) docker create

6 / 30

6. Which of the following best describes a Dockerfile?

A) A log file for tracking container events

B) A template for creating Docker images

C) A configuration file for Docker CLI

D) A script for managing Docker networks

7 / 30

7. How do you tag a Docker image during the build process?

A) By using the -t flag

B) By using the -name flag

C) By using the --image flag

D) By renaming the Dockerfile

8 / 30

8. What is the difference between a container and an image?

A) A container is a running instance of an image.

B) An image is a running container.

C) An image cannot be reused, but a container can.

D) A container is the same as an image.

9 / 30

9. Which command is used to remove a container?

A) docker rm <container-id>

B) docker rmi <container-id>

C) docker delete <container-id>

D) docker remove <container-id>

10 / 30

10. How does Docker simplify CI/CD pipelines?

A) By providing consistent environments for development, testing, and production

B) By reducing the need for code reviews

C) By eliminating the need for orchestration tools

D) By replacing version control systems

11 / 30

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

A) docker push

B) docker export

C) docker save

D) docker tar

12 / 30

12. What is the primary reason for setting resource limits in Docker containers?

A) To restrict unauthorized network access

B) To prevent containers from exhausting host resources

C) To improve the container's performance

D) To enable container orchestration

13 / 30

13. What is Docker Hub?

A) A tool for monitoring Docker containers

B) A physical server for storing Docker data

C) A cloud-based registry for Docker images

D) A command-line interface for Docker

14 / 30

14. How do you define custom networks in Docker Compose?

A) Automatically generated by Compose

B) Using the docker network create command

C) By defining them in the container

D) Under the networks key in docker-compose.yml

15 / 30

15. What is the role of SELinux in Docker security?

A) Enforces access control policies on containers

B) Scans Dockerfiles for vulnerabilities

C) Encrypts container images

D) Manages container networking

16 / 30

16. What is the default working directory inside a container?

A) /root

B) /home

C) /var

D) / (root directory)

17 / 30

17. Which tool is required to run Docker on Windows 10 Home edition?

A) WSL 1

B) VirtualBox

C) WSL 2

D) VMWare Workstation

18 / 30

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

A) To configure Docker secrets

B) To define advanced networking rules

C) To manage Docker security policies

D) To override the default Compose configuration

19 / 30

19. How can you verify if Docker is installed correctly on your system?

A) docker verify

B) docker run

C) docker --version

D) docker test

20 / 30

20. Which command is used to install Docker on a Debian-based system?

A) zypper install docker

B) apt install docker

C) yum install docker

D) apt-get install docker-ce

21 / 30

21. How do you copy files from a container to the host?

A) docker cp <container-id>:<src-path> <dest-path>

B) docker save <src-path> <dest-path>

C) docker copy <container-id> <src-path>

D) docker export <container-id>

22 / 30

22. What is the default network mode for Docker Compose services?

A) Host

B) Bridge

C) Overlay

D) None

23 / 30

23. Which of the following tools can help enforce Docker image security policies?

A) Docker Content Trust

B) Docker Compose

C) Kubernetes

D) Jenkins

24 / 30

24. How can Docker images be scanned for vulnerabilities?

A) Using docker image prune

B) By running the container and checking logs

C) Using tools like Trivy or Docker Scan

D) By manually inspecting the Dockerfile

25 / 30

25. How do you name a container when running it?

A) Using the --id flag

B) Using the -t flag

C) Using the --name flag

D) By renaming the Dockerfile

26 / 30

26. Which of the following is a common orchestration tool used with Docker in production?

A) Kubernetes

B) Terraform

C) Ansible

D) Jenkins

27 / 30

27. What does the docker pull command do?

A) Creates a new Docker image

B) Downloads a Docker image from a registry

C) Deletes a Docker image

D) Runs a container from a Docker image

28 / 30

28. How can you view the logs of a container?

A) docker history <container-id>

B) docker view <container-id>

C) docker logs <container-id>

D) docker inspect <container-id>

29 / 30

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

A) docker-compose run

B) docker exec

C) docker-compose exec

D) docker attach

30 / 30

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

A) It is moved to an archive.

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

C) It is automatically deleted.

D) It cannot be restarted.

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