Docker Quiz Test Online (30 random Questions) 2025

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 storage option allows Docker volumes to persist across host machines?

A) Bind Mounts

B) tmpfs

C) Overlay Network

D) NFS or External Storage Drivers

2 / 30

2. Why should you avoid storing secrets in Docker images?

A) Secrets in images can be easily exposed when the image is shared

B) It prevents multi-stage builds

C) It slows down container startup

D) It increases image size

3 / 30

3. What is the default restart policy for a container?

A) Unless-stopped

B) On-failure

C) No

D) Always

4 / 30

4. Which command removes containers, networks, and volumes created by Docker Compose?

A) docker-compose destroy

B) docker-compose down

C) docker-compose prune

D) docker-compose remove

5 / 30

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

A) docker-compose show

B) docker-compose logs

C) docker-compose events

D) docker-compose status

6 / 30

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

A) Ansible

B) Kubernetes

C) Terraform

D) Jenkins

7 / 30

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

A) Version 1709

B) Version 1803

C) Version 2004

D) Version 1903

8 / 30

8. Which of the following is required to install Docker on Linux?

A) A system with a hypervisor

B) A pre-installed Docker registry

C) An active Docker subscription

D) A Linux distribution with kernel version 3.10 or higher

9 / 30

9. Which command lists all available Docker networks?

A) docker network list

B) docker networks

C) docker network inspect

D) docker network ls

10 / 30

10. What is a Docker container?

A) A lightweight, standalone executable package for software

B) A tool for monitoring application performance

C) A physical server for running applications

D) A virtual machine for hosting databases

11 / 30

11. Which file format is used to define a Docker image?

A) JSON

B) Dockerfile

C) YAML

D) XML

12 / 30

12. In a CI/CD pipeline, what is the purpose of the docker push command?

A) To build a Docker image

B) To upload a Docker image to a container registry

C) To run a container

D) To stop a running container

13 / 30

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

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

B) A container is the same as an image.

C) An image is a running container.

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

14 / 30

14. Which command is used to remove a container?

A) docker rm <container-id>

B) docker delete <container-id>

C) docker rmi <container-id>

D) docker remove <container-id>

15 / 30

15. Which flag is used to run a container in detached mode?

A) --detach

B) -d

C) -i

D) Both B and C

16 / 30

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

A) pipeline.yml

B) config.json

C) docker-compose.yml

D) gitlab-ci.yml

17 / 30

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

A) To evaluate Docker installations against security best practices

B) To automate container deployments

C) To encrypt container data

D) To monitor container resource usage

18 / 30

18. What is the purpose of the docker stack deploy command?

A) To initialize Docker networking

B) To deploy a stack of containers

C) To deploy services in a Docker Swarm cluster

D) To create a multi-stage Dockerfile

19 / 30

19. What does the --detach or -d flag do when starting a container?

A) Allocates interactive shell access

B) Stops the container immediately

C) Runs the container in detached (background) mode

D) Enables container debugging

20 / 30

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

A) ENTRYPOINT defines executable instructions

B) ENTRYPOINT provides default commands

C) ENTRYPOINT sets the base image

D) ENTRYPOINT is for environment variables

21 / 30

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

A) It cannot be restarted.

B) It is automatically deleted.

C) It is moved to an archive.

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

22 / 30

22. How can Docker images be scanned for vulnerabilities?

A) Using tools like Trivy or Docker Scan

B) By running the container and checking logs

C) Using docker image prune

D) By manually inspecting the Dockerfile

23 / 30

23. Which command lists all services defined in a Docker Compose file?

A) docker-compose show

B) docker-compose services

C) docker-compose ls

D) docker-compose ps

24 / 30

24. What does a Docker image contain?

A) Only configuration files

B) The application, its dependencies, and configuration

C) Only the application code

D) The runtime environment but not the code

25 / 30

25. What is the function of cgroups in Docker?

A) Isolates containers on a network

B) Enforces resource limits for containers

C) Validates image signatures

D) Manages Swarm secrets

26 / 30

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

A) --reset

B) --build

C) --recreate

D) --force

27 / 30

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

A) Docker archives the container.

B) Docker throws an error.

C) The container is forcefully stopped and removed.

D) The container is removed without stopping it.

28 / 30

28. How can Docker containers achieve high availability in production?

A) By avoiding orchestration tools

B) Using a single host for all containers

C) Using container restart policies

D) By sharing the same network

29 / 30

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

A) Enables real-time container monitoring

B) Reduces the final image size

C) Simplifies build pipelines

D) Improves build performance

30 / 30

30. Which command starts the Docker service after installation on Linux?

A) systemctl enable docker

B) docker start

C) service docker enable

D) systemctl start docker

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