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 does the docker stack ps command display?

A) Health status of the stack

B) Running containers in a stack

C) Logs of a stack's services

D) Status of tasks in a stack

2 / 30

2. How can you restart a stopped container?

A) docker run <container-id>

B) docker init <container-id>

C) docker restart <container-id>

D) docker start <container-id>

3 / 30

3. Which component of Docker is responsible for creating containers?

A) Docker Engine

B) Docker Compose

C) Docker Hub

D) Docker CLI

4 / 30

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

A) It cannot be restarted.

B) It is moved to an archive.

C) It is automatically deleted.

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

5 / 30

5. How do you limit CPU usage for a container?

A) --limit-cpu

B) --cpu-limit

C) --cpu-share

D) --cpus

6 / 30

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

A) Regularly update Docker images

B) Limit container privileges using --cap-drop

C) Use a minimal base image

D) Store secrets in environment variables

7 / 30

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

A) To view detailed information about a network

B) To delete a network

C) To create a new network

D) To connect a container to a network

8 / 30

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

A) To remove unused images, containers, and networks

B) To optimize container resource usage

C) To reset the Docker daemon

D) To clean up unused volumes only

9 / 30

9. What was the primary reason for developing Docker?

A) To replace virtual machines entirely

B) To improve hardware virtualization

C) To create a new programming language

D) To simplify software deployment and ensure consistency across environments

10 / 30

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

A) CentOS

B) Alpine

C) Ubuntu

D) Debian

11 / 30

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

A) docker pull

B) docker run

C) docker create

D) docker build

12 / 30

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

A) To list all networks

B) To create a new network

C) To create a container

D) To connect a container to a network

13 / 30

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

A) Root user

B) Non-root user

C) Host system user

D) Docker service user

14 / 30

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

A) docker-compose.yml

B) pipeline.yml

C) gitlab-ci.yml

D) config.json

15 / 30

15. How do you uninstall Docker on Linux?

A) Both B and C

B) apt-get remove docker-ce

C) docker uninstall

D) yum remove docker

16 / 30

16. What is an image ID in Docker?

A) A hash that uniquely identifies a Docker image

B) A tag assigned to an image

C) A unique identifier for Docker Hub

D) A unique identifier for a container

17 / 30

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

A) -d

B) Both B and C

C) -i

D) --detach

18 / 30

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

A) UDP

B) IP

C) HTTP

D) TCP

19 / 30

19. How do you stop all running services managed by Docker Compose?

A) docker-compose stop

B) docker-compose kill

C) docker-compose down

D) docker-compose terminate

20 / 30

20. Which command shows the IP address of a running container?

A) docker ip

B) docker inspect

C) docker ps --ip

D) docker info

21 / 30

21. Which networking option allows containers on separate hosts to communicate in a Swarm?

A) Overlay Network

B) None of the above

C) Bridge Network

D) Host Network

22 / 30

22. 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

23 / 30

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

A) docker layers

B) docker inspect

C) docker history

D) docker logs

24 / 30

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

A) To improve container build times

B) To reduce the size of the image

C) To simplify debugging

D) To enforce immutability and enhance security

25 / 30

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

A) A strategy for container scaling

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

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

D) A process of chaining multiple containers together

26 / 30

26. What is the base image in Docker?

A) The default image used for all containers

B) An empty Docker container

C) The first layer of any Docker image

D) A custom-built image from scratch

27 / 30

27. What does the --cap-drop flag do in Docker?

A) Reduces a container's capabilities

B) Removes unused images from the host

C) Disables logging for a container

D) Limits CPU usage for a container

28 / 30

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

A) ~400 MB

B) ~2 GB

C) ~200 MB

D) ~1 GB

29 / 30

29. In which year was Docker initially released?

A) 2013

B) 2017

C) 2011

D) 2015

30 / 30

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

A) Use multi-stage builds and minimal base images

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

C) Avoid specifying a base image

D) Include all debugging tools in the image

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