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 is required for Docker Swarm to function?

A) Overlay

B) Bridge

C) None

D) Host

2 / 30

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

A) An active Docker subscription

B) A pre-installed Docker registry

C) A system with a hypervisor

D) A Linux distribution with kernel version 3.10 or higher

3 / 30

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

A) To store an image in Docker Hub

B) To save a container's state

C) To export an image as a tar file

D) To save logs of a container

4 / 30

4. What does the docker-compose up command do in a CI/CD process?

A) Pulls images from the Docker registry

B) Builds Docker images only

C) Stops all running containers

D) Starts and runs all services defined in a Compose file

5 / 30

5. How can you restart a stopped container?

A) docker restart <container-id>

B) docker init <container-id>

C) docker run <container-id>

D) docker start <container-id>

6 / 30

6. How do you enable encrypted communication in an overlay network?

A) --tls

B) --secure

C) --encrypted

D) --driver overlay --opt encrypted

7 / 30

7. What does the docker rmi command do?

A) Removes Docker networking configurations

B) Removes all Docker containers

C) Removes a running container

D) Removes an unused Docker image

8 / 30

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

A) XML

B) JSON

C) YAML

D) Dockerfile

9 / 30

9. How do you publish a container port to the host system?

A) Using the --dns flag in docker run

B) Using the --expose flag in docker run

C) By modifying the Dockerfile

D) Using the -p or --publish flag in docker run

10 / 30

10. What does the -it flag do in the docker run command?

A) Specifies the image tag to use

B) Runs the container in detached mode

C) Allocates a pseudo-TTY and keeps the container interactive

D) Runs multiple containers simultaneously

11 / 30

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

A) The image is tagged with the username

B) Docker assigns a default tag of latest

C) The image is built without a tag

D) The build will fail

12 / 30

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

A) zypper

B) yum

C) apt

D) pacman

13 / 30

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

A) Docker Compose

B) Docker Engine

C) Docker Hub

D) Docker CLI

14 / 30

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

A) To develop code faster

B) To save disk space

C) To streamline and standardize deployments

D) To replace virtual machines entirely

15 / 30

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

A) Docker service user

B) Non-root user

C) Root user

D) Host system user

16 / 30

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

A) Kubernetes

B) Terraform

C) Jenkins

D) Ansible

17 / 30

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

A) It is moved to an archive.

B) It cannot be restarted.

C) It is automatically deleted.

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

18 / 30

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

A) --cpus

B) --cpu-share

C) --cpu-limit

D) --limit-cpu

19 / 30

19. How do you uninstall Docker on Linux?

A) docker uninstall

B) yum remove docker

C) apt-get remove docker-ce

D) Both B and C

20 / 30

20. What is a dangling image in Docker?

A) An image with no associated tag

B) An image stored in a remote registry

C) An image with vulnerabilities

D) An image with large size

21 / 30

21. What is the purpose of the -P flag in the docker run command?

A) To pause the container after running

B) To publish ports explicitly

C) To automatically map container ports to random host ports

D) To enable port forwarding

22 / 30

22. Which of the following is a common tool for implementing CI/CD pipelines with Docker?

A) Kubernetes

B) Docker Compose

C) Terraform

D) Jenkins

23 / 30

23. How can you view the logs of a container?

A) docker logs <container-id>

B) docker inspect <container-id>

C) docker view <container-id>

D) docker history <container-id>

24 / 30

24. Which command is used to install Docker on macOS?

A) brew install docker

B) yum install docker

C) zypper install docker

D) apt-get install docker

25 / 30

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

A) Docker Desktop Enterprise

B) Docker Enterprise Edition (EE)

C) Docker Pro

D) Docker Community Edition (CE)

26 / 30

26. What does the docker checkpoint feature do?

A) Restarts a container automatically

B) Creates a backup of a container's state

C) Monitors resource usage of a container

D) Creates a snapshot of a container's runtime state

27 / 30

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

A) To initialize Docker networking

B) To create a multi-stage Dockerfile

C) To deploy a stack of containers

D) To deploy services in a Docker Swarm cluster

28 / 30

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

A) Unless-stopped

B) On-failure

C) No

D) Always

29 / 30

29. What is the role of Docker CLI?

A) To monitor container performance

B) To host containerized applications

C) To optimize Docker image builds

D) To provide a command-line interface for interacting with Docker

30 / 30

30. What does the docker tag command do?

A) Assigns a tag to a Docker image

B) Builds a new Docker image

C) Pushes an image to a registry

D) Deletes a Docker image

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