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 command inspects the IP address of a running container?

A) docker ps

B) docker ip <container>

C) docker inspect <container>

D) docker network ip

2 / 30

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

A) docker list --all

B) docker ps -a

C) docker ps

D) docker containers

3 / 30

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

A) Docker throws an error during the build process.

B) Only the first CMD instruction is executed.

C) All CMD instructions are executed sequentially.

D) The last CMD instruction overrides the previous ones.

4 / 30

4. What is a dangling image in Docker?

A) An image with large size

B) An image with no associated tag

C) An image stored in a remote registry

D) An image with vulnerabilities

5 / 30

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

A) To override the default Compose configuration

B) To configure Docker secrets

C) To define advanced networking rules

D) To manage Docker security policies

6 / 30

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

A) It slows down container startup

B) It prevents multi-stage builds

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

D) It increases image size

7 / 30

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

A) By sharing the same network

B) Using a single host for all containers

C) By avoiding orchestration tools

D) Using container restart policies

8 / 30

8. What happens if you use docker build without a tag?

A) The image is built without a tag

B) Docker assigns a default tag of latest

C) The image is tagged with the username

D) The build will fail

9 / 30

9. Which network driver is required for Docker Swarm to function?

A) Overlay

B) Host

C) Bridge

D) None

10 / 30

10. What file is used to build a Docker image?

A) ImageConfig

B) DockerConfig.json

C) Dockerfile

D) ImageBuilder

11 / 30

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

A) docker-compose exec

B) docker attach

C) docker exec

D) docker-compose run

12 / 30

12. What is the role of --internal in Docker networks?

A) It prevents external access to the network.

B) It connects containers across hosts.

C) It enables encrypted communication.

D) It allows containers to bypass the DNS.

13 / 30

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

A) Overlay network

B) Namespaces

C) Control groups (cgroups)

D) Docker Compose

14 / 30

14. What is the purpose of the docker network inspect command?

A) To view detailed information about a network

B) To create a new network

C) To connect a container to a network

D) To delete a network

15 / 30

15. What is the primary purpose of Docker volumes?

A) To monitor container performance

B) To provide persistent storage for containers

C) To manage network configurations

D) To share images between containers

16 / 30

16. Which network driver is used for communication between containers on the same host by default?

A) None

B) Bridge

C) Overlay

D) Host

17 / 30

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

A) Host system user

B) Docker service user

C) Non-root user

D) Root user

18 / 30

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

A) To remove unused images, containers, and networks

B) To clean up unused volumes only

C) To optimize container resource usage

D) To reset the Docker daemon

19 / 30

19. Which protocol is primarily used by Docker for container communication?

A) TCP

B) UDP

C) IP

D) HTTP

20 / 30

20. What does Docker Content Trust (DCT) provide?

A) Resource monitoring tools

B) Encryption for container logs

C) Image signing and verification

D) A logging framework for containers

21 / 30

21. What is the primary reason for setting resource limits in Docker containers?

A) To improve the container's performance

B) To prevent containers from exhausting host resources

C) To restrict unauthorized network access

D) To enable container orchestration

22 / 30

22. Which file system is used by Docker containers?

A) UnionFS

B) Ext4

C) NTFS

D) Btrfs

23 / 30

23. Which command is used to start all services defined in a docker-compose.yml file?

A) docker-compose run

B) docker-compose start

C) docker-compose up

D) docker-compose create

24 / 30

24. What is Docker Swarm?

A) A feature for securing Docker containers

B) A tool for building multi-stage images

C) A Kubernetes alternative for managing containers

D) Docker's native clustering and orchestration tool

25 / 30

25. What is the name of the tool used to define multi-container applications?

A) Docker Engine

B) Docker CLI

C) Docker Compose

D) Docker Hub

26 / 30

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

A) Overlay

B) Host

C) None

D) Bridge

27 / 30

27. What is the default Docker installation directory on Linux?

A) /etc/docker

B) /var/lib/docker

C) /opt/docker

D) /usr/docker

28 / 30

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

A) docker run

B) docker image

C) docker build

D) docker create

29 / 30

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

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

B) By renaming the file

C) Using the --override flag

D) By creating a docker-override.yml file

30 / 30

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

A) Building multiple containers simultaneously

B) Optimizing Docker images by using intermediate stages to reduce image size

C) Using multiple base images in a single Dockerfile

D) Running multiple containers in parallel

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