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. What is the primary benefit of using Docker in CI/CD?

A) Eliminates testing phases

B) Faster deployment cycles

C) Reduces the size of source code

D) Automatic code generation

2 / 30

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

A) docker export <container-id>

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

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

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

3 / 30

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

A) ~2 GB

B) ~400 MB

C) ~1 GB

D) ~200 MB

4 / 30

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

A) Host

B) Overlay

C) None

D) Bridge

5 / 30

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

A) A technique to reduce image size by separating build and runtime stages

B) A method to create multiple images from a single Dockerfile

C) A strategy for container scaling

D) A process of chaining multiple containers together

6 / 30

6. What does the docker tag command do?

A) Deletes a Docker image

B) Assigns a tag to a Docker image

C) Pushes an image to a registry

D) Builds a new Docker image

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. What does Docker Content Trust (DCT) provide?

A) A logging framework for containers

B) Resource monitoring tools

C) Encryption for container logs

D) Image signing and verification

9 / 30

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

A) docker-compose down --remove-orphans

B) docker-compose clean

C) docker-compose rm -orphans

D) docker-compose prune

10 / 30

10. What was the primary reason for developing Docker?

A) To improve hardware virtualization

B) To replace virtual machines entirely

C) To create a new programming language

D) To simplify software deployment and ensure consistency across environments

11 / 30

11. What is the primary goal of using Docker in production?

A) To streamline and standardize deployments

B) To develop code faster

C) To save disk space

D) To replace virtual machines entirely

12 / 30

12. What is the purpose of the docker pull command?

A) To list all available images

B) To create a new container

C) To remove an image

D) To download an image from a registry

13 / 30

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

A) --force

B) --recreate

C) --build

D) --reset

14 / 30

14. 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 restart a container

D) To remove a container

15 / 30

15. What is the default user in a Docker container if none is specified?

A) Host system user

B) Root user

C) Docker service user

D) Non-root user

16 / 30

16. What is the default network driver used by Docker Compose?

A) Overlay

B) Host

C) Bridge

D) None

17 / 30

17. What is the default port used by Docker Daemon?

A) 443

B) 22

C) 8080

D) 2375

18 / 30

18. What does the --no-cache flag do during docker build?

A) Skips Dockerfile validation

B) Disables multi-stage builds

C) Builds without using cached layers

D) Cleans up image cache after building

19 / 30

19. 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.

20 / 30

20. What is the default filename for Docker Compose configuration?

A) docker.yml

B) compose.yaml

C) docker-compose.yml

D) compose.json

21 / 30

21. How can you enable Docker to start automatically on Linux?

A) systemctl enable docker

B) service docker enable

C) enable docker boot

D) docker --auto-start

22 / 30

22. Which network driver disables all networking for a container?

A) Overlay

B) None

C) Bridge

D) Host

23 / 30

23. What happens if multiple CMD instructions are used in a Dockerfile?

A) All CMD instructions are executed sequentially.

B) Only the first CMD instruction is executed.

C) Docker throws an error during the build process.

D) The last CMD instruction overrides the previous ones.

24 / 30

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

A) Enforces access control policies on containers

B) Manages container networking

C) Encrypts container images

D) Scans Dockerfiles for vulnerabilities

25 / 30

25. Why is it recommended to use read-only containers in production?

A) To improve container build times

B) To simplify debugging

C) To reduce the size of the image

D) To enforce immutability and enhance security

26 / 30

26. How do you pause a running container?

A) docker stop <container-id>

B) docker hold <container-id>

C) docker freeze <container-id>

D) docker pause <container-id>

27 / 30

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

A) docker-compose remove

B) docker-compose down

C) docker-compose prune

D) docker-compose destroy

28 / 30

28. Which file system is used by Docker containers?

A) Btrfs

B) UnionFS

C) Ext4

D) NTFS

29 / 30

29. Which command updates a running service in Docker Compose?

A) docker-compose redeploy

B) docker-compose restart

C) docker-compose update

D) docker-compose up

30 / 30

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

A) apt

B) pacman

C) yum

D) zypper

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