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

A) By using the --image flag

B) By using the -t flag

C) By renaming the Dockerfile

D) By using the -name flag

2 / 30

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

3 / 30

3. Which of the following is a key feature of using Docker in CI/CD pipelines?

A) Automatic database backups

B) Elimination of all errors

C) Replacement of testing frameworks

D) Environment consistency across stages

4 / 30

4. What is the function of cgroups in Docker?

A) Validates image signatures

B) Enforces resource limits for containers

C) Isolates containers on a network

D) Manages Swarm secrets

5 / 30

5. How do you rename a running container?

A) docker edit-name <container-id>

B) docker rename <container-id>

C) docker name <container-id>

D) docker rename <old-name> <new-name>

6 / 30

6. Which network driver allows a container to share the host's network namespace?

A) Host

B) Overlay

C) None

D) Bridge

7 / 30

7. Which file system is used by Docker containers?

A) UnionFS

B) Btrfs

C) NTFS

D) Ext4

8 / 30

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

A) docker-compose clean

B) docker-compose rm -orphans

C) docker-compose prune

D) docker-compose down --remove-orphans

9 / 30

9. How do you override the default docker-compose.yml file?

A) Using the -f flag with docker-compose commands

B) Using the --override flag

C) By creating a docker-override.yml file

D) By renaming the file

10 / 30

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

A) Docker Compose

B) Jenkins

C) Docker Content Trust

D) Kubernetes

11 / 30

11. How do you list all containers, including stopped ones?

A) docker containers

B) docker ps -a

C) docker ps

D) docker list --all

12 / 30

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

A) docker tar

B) docker export

C) docker save

D) docker push

13 / 30

13. How can you scale a service using Docker Compose?

A) Both A and B

B) Using the docker-compose scale command

C) By adding replicas in docker-compose.yml

D) Using the --replicas flag with docker-compose up

14 / 30

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

A) Kubernetes

B) Terraform

C) Ansible

D) Jenkins

15 / 30

15. What is the difference between a Docker image and a container?

A) Containers and images are the same

B) A container is a running instance of an image

C) Images store logs, while containers run processes

D) An image is a running instance of a container

16 / 30

16. Which package manager is used to install Docker on Red Hat-based systems?

A) yum

B) pacman

C) zypper

D) apt

17 / 30

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

A) To evaluate Docker installations against security best practices

B) To encrypt container data

C) To automate container deployments

D) To monitor container resource usage

18 / 30

18. Which command is used to enable Docker Content Trust?

A) export DOCKER_ENABLE_TRUST=1

B) export DOCKER_CONTENT_TRUST=1

C) docker trust enable

D) docker trust sign

19 / 30

19. Which file format is typically used to define CI/CD pipelines in GitLab CI/CD?

A) docker-compose.yml

B) pipeline.yml

C) gitlab-ci.yml

D) config.json

20 / 30

20. What command is used to add Docker’s official GPG key when installing on Linux?

A) curl -fsSL

B) sudo key-add docker

C) docker-gpg add

D) wget -key

21 / 30

21. What is the default logging driver in Docker?

A) JSON-file

B) syslog

C) Journald

D) Fluentd

22 / 30

22. What prerequisite must be installed before installing Docker on Windows?

A) Hyper-V

B) VirtualBox

C) Microsoft Edge

D) Windows PowerShell

23 / 30

23. What does the .dockerignore file do in a CI/CD process?

A) Excludes files and directories from being added to a Docker image

B) Lists the dependencies of the application

C) Automates deployment of containers

D) Specifies the image version to be used

24 / 30

24. Which command inspects the IP address of a running container?

A) docker ps

B) docker network ip

C) docker inspect <container>

D) docker ip <container>

25 / 30

25. What does the docker rmi command do?

A) Removes a running container

B) Removes all Docker containers

C) Removes Docker networking configurations

D) Removes an unused Docker image

26 / 30

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

A) docker view <container-id>

B) docker logs <container-id>

C) docker inspect <container-id>

D) docker history <container-id>

27 / 30

27. Which command is used to build a Docker image from a Dockerfile?

A) docker image

B) docker build

C) docker create

D) docker run

28 / 30

28. What is the default network type created when Docker is installed?

A) Bridge

B) None

C) Host

D) Overlay

29 / 30

29. What is the purpose of the docker exec command?

A) To create a new container

B) To run a command in a running container

C) To remove a container

D) To restart a container

30 / 30

30. 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

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