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 is the default network mode for Docker Compose services?

A) Host

B) None

C) Overlay

D) Bridge

2 / 30

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

A) Images store logs, while containers run processes

B) A container is a running instance of an image

C) Containers and images are the same

D) An image is a running instance of a container

3 / 30

3. What is the default user inside a Docker container?

A) System

B) Root

C) Docker

D) Admin

4 / 30

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

A) An image is a running container.

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

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

D) A container is the same as an image.

5 / 30

5. Which storage option allows Docker volumes to persist across host machines?

A) Bind Mounts

B) tmpfs

C) Overlay Network

D) NFS or External Storage Drivers

6 / 30

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

A) Automates deployment of containers

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

C) Specifies the image version to be used

D) Lists the dependencies of the application

7 / 30

7. What does a Docker image contain?

A) The application, its dependencies, and configuration

B) Only configuration files

C) The runtime environment but not the code

D) Only the application code

8 / 30

8. Why is tagging Docker images important in CI/CD pipelines?

A) To reduce image size

B) To uniquely identify and version images

C) To encrypt image layers

D) To improve build speed

9 / 30

9. What is the purpose of the -P flag in the docker run command?

A) To enable port forwarding

B) To automatically map container ports to random host ports

C) To publish ports explicitly

D) To pause the container after running

10 / 30

10. What is the purpose of the docker network create command?

A) To list all networks

B) To create a container

C) To connect a container to a network

D) To create a new network

11 / 30

11. How does Docker ensure efficient use of system resources?

A) By running all containers on different hosts

B) By using a shared kernel and containerization

C) By allocating fixed memory to containers

D) By creating virtual machines

12 / 30

12. Which flag is used with docker-compose up to recreate containers even if they already exist?

A) --reset

B) --recreate

C) --force

D) --build

13 / 30

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

A) /var

B) / (root directory)

C) /root

D) /home

14 / 30

14. How do you inspect detailed information about a container?

A) docker ps --detail

B) docker logs <container-id>

C) docker history <container-id>

D) docker inspect <container-id>

15 / 30

15. Which command lists all available Docker networks?

A) docker network inspect

B) docker network list

C) docker network ls

D) docker networks

16 / 30

16. What is the minimum required version of Windows 10 to install Docker Desktop?

A) Version 1709

B) Version 1903

C) Version 2004

D) Version 1803

17 / 30

17. What is the best way to monitor container resource usage in production?

A) Relying on container logs

B) Avoiding resource limits

C) Using built-in Docker commands

D) Using monitoring tools like cAdvisor or Prometheus

18 / 30

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

A) By using the --image flag

B) By renaming the Dockerfile

C) By using the -t flag

D) By using the -name flag

19 / 30

19. Which tool is used to resolve container names to IP addresses in Docker?

A) Bridge resolver

B) Docker DNS

C) DNS server

D) Network manager

20 / 30

20. Which of the following is NOT an advantage of Docker Compose?

A) Simplifies multi-container setup

B) Allows easy scaling of services

C) Manages container dependencies automatically

D) Provides built-in monitoring and alerting

21 / 30

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

A) Regularly update Docker images

B) Store secrets in environment variables

C) Use a minimal base image

D) Limit container privileges using --cap-drop

22 / 30

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

A) docker layers

B) docker logs

C) docker history

D) docker inspect

23 / 30

23. What does the docker-compose up command do in a CI/CD process?

A) Pulls images from the Docker registry

B) Stops all running containers

C) Starts and runs all services defined in a Compose file

D) Builds Docker images only

24 / 30

24. What is the purpose of the docker system prune command?

A) To optimize container resource usage

B) To clean up unused volumes only

C) To reset the Docker daemon

D) To remove unused images, containers, and networks

25 / 30

25. Which command displays container resource usage statistics?

A) docker monitor

B) docker inspect

C) docker stats

D) docker logs

26 / 30

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

A) docker-compose exec

B) docker-compose run

C) docker attach

D) docker exec

27 / 30

27. How do you list all running containers?

A) docker list

B) docker containers

C) docker ps

D) docker show

28 / 30

28. On which Linux distributions is Docker officially supported?

A) Only Ubuntu and CentOS

B) Most major distributions, including Ubuntu, CentOS, Fedora, and Debian

C) Only Debian-based distributions

D) Only Red Hat-based distributions

29 / 30

29. Which Docker feature isolates containers at the kernel level?

A) Control groups (cgroups)

B) Namespaces

C) Docker Compose

D) Overlay network

30 / 30

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

A) To override the default Compose configuration

B) To manage Docker security policies

C) To define advanced networking rules

D) To configure Docker secrets

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