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

A) None

B) Overlay

C) Bridge

D) Host

2 / 30

2. What is the default base image for most Docker images?

A) CentOS

B) Ubuntu

C) Alpine

D) Debian

3 / 30

3. What is the default subnet for the bridge network in Docker?

A) 10.0.0.0/8

B) 192.168.0.0/24

C) 127.0.0.0/8

D) 172.17.0.0/16

4 / 30

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

A) Bridge

B) None

C) Host

D) Overlay

5 / 30

5. What is Docker's Content Trust?

A) A resource monitoring tool

B) A feature for image signing and verification

C) A method for container encryption

D) A logging tool

6 / 30

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

A) docker attach

B) docker-compose exec

C) docker-compose run

D) docker exec

7 / 30

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

A) Control groups (cgroups)

B) Docker Compose

C) Namespaces

D) Overlay network

8 / 30

8. How can you optimize Docker images for production use?

A) Include all debugging tools in the image

B) Use multi-stage builds and minimal base images

C) Use apt-get install commands directly in the Dockerfile

D) Avoid specifying a base image

9 / 30

9. Which file system is used by Docker containers?

A) UnionFS

B) Btrfs

C) NTFS

D) Ext4

10 / 30

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

A) None

B) Bridge

C) Host

D) Overlay

11 / 30

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

A) docker run

B) docker pull

C) docker build

D) docker create

12 / 30

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

A) ~400 MB

B) ~2 GB

C) ~1 GB

D) ~200 MB

13 / 30

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

A) docker image

B) docker build

C) docker run

D) docker create

14 / 30

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

A) docker-compose down

B) docker-compose destroy

C) docker-compose prune

D) docker-compose remove

15 / 30

15. What is the purpose of the EXPOSE instruction in a Dockerfile?

A) To map container ports to the host machine

B) To block all ports of the container

C) To publish ports for the container

D) To specify ports the container listens on

16 / 30

16. What is the purpose of AppArmor in Docker?

A) To provide network isolation

B) To enforce security profiles for containers

C) To restrict container resource usage

D) To manage container logs

17 / 30

17. Which instruction in a Dockerfile is used to run a command during the build process?

A) WORKDIR

B) CMD

C) ENTRYPOINT

D) RUN

18 / 30

18. Which command is used to prune unused volumes in Docker?

A) docker system prune

B) docker clean volumes

C) docker volume cleaD

D) docker volume prune

19 / 30

19. What is the purpose of the docker save command?

A) To save logs of a container

B) To export an image as a tar file

C) To store an image in Docker Hub

D) To save a container's state

20 / 30

20. Which Docker version is free to use for individuals and small businesses?

A) Docker Community Edition (CE)

B) Docker Pro

C) Docker Desktop Enterprise

D) Docker Enterprise Edition (EE)

21 / 30

21. What does the -d option in the docker run command do?

A) Stops the container after execution

B) Deletes the container after it stops

C) Runs the container in interactive mode

D) Runs the container in detached mode

22 / 30

22. How do you update a running container's configuration in Docker Compose?

A) Use the docker-compose update command

B) Restart the container

C) Rebuild the container and restart using docker-compose up --build

D) Edit the container configuration manually

23 / 30

23. What is the purpose of a Docker registry in a CI/CD workflow?

A) To manage container networking

B) To store and distribute Docker images

C) To monitor container logs

D) To orchestrate containers

24 / 30

24. How do you specify a custom subnet when creating a Docker network?

A) docker network create --mask=<subnet>

B) docker network create --subnet=<subnet>

C) docker network create --cidr=<subnet>

D) docker network create --ip-range=<subnet>

25 / 30

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

A) The container is removed without stopping it.

B) Docker throws an error.

C) The container is forcefully stopped and removed.

D) Docker archives the container.

26 / 30

26. Where are Docker images stored locally by default?

A) /etc/docker/images

B) /usr/lib/docker

C) /var/lib/docker

D) /var/docker/images

27 / 30

27. How do you build all services defined in a Compose file?

A) docker-compose build

B) docker-compose create

C) docker-compose compile

D) docker-compose prepare

28 / 30

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

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

B) A container is the same as an image.

C) An image is a running container.

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

29 / 30

29. What is the base image in Docker?

A) The default image used for all containers

B) A custom-built image from scratch

C) An empty Docker container

D) The first layer of any Docker image

30 / 30

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

A) Ansible

B) Terraform

C) Kubernetes

D) Jenkins

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