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.

0 votes, 0 avg

You have 30 minutes to complete the quiz. The timer will start when you click the 'Start Quiz' button. Please ensure you are ready before beginning.

Time is up! Your quiz has ended. Your responses have been submitted automatically.

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 recommended way to store sensitive information like passwords in Docker production environments?

A) Use Docker Secrets

B) Use environment variables

C) Hard-code them into the application code

D) Store them directly in the Dockerfile

2 / 30

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

A) apt-get install docker

B) brew install docker

C) zypper install docker

D) yum install docker

3 / 30

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

A) Non-root user

B) Docker service user

C) Root user

D) Host system user

4 / 30

4. In a CI/CD pipeline, what is the purpose of the docker push command?

A) To run a container

B) To upload a Docker image to a container registry

C) To stop a running container

D) To build a Docker image

5 / 30

5. 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) Starts and runs all services defined in a Compose file

D) Stops all running containers

6 / 30

6. What is Docker Hub?

A) A physical server for storing Docker data

B) A cloud-based registry for Docker images

C) A tool for monitoring Docker containers

D) A command-line interface for Docker

7 / 30

7. Which file system is used by Docker containers?

A) UnionFS

B) Ext4

C) Btrfs

D) NTFS

8 / 30

8. Which command inspects the IP address of a running container?

A) docker network ip

B) docker ip <container>

C) docker ps

D) docker inspect <container>

9 / 30

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

A) Unless-stopped

B) No

C) Always

D) On-failure

10 / 30

10. What is the primary purpose of Docker volumes?

A) To provide persistent storage for containers

B) To share images between containers

C) To monitor container performance

D) To manage network configurations

11 / 30

11. Who is the founder of Docker?

A) Linus Torvalds

B) Brendan Burns

C) Kelsey Hightower

D) Solomon Hykes

12 / 30

12. What is the purpose of using multi-stage builds in Docker security?

A) To automatically deploy containers

B) To reduce image size and exclude unnecessary dependencies

C) To increase the number of layers in the image

D) To improve container startup time

13 / 30

13. Which command removes all stopped containers?

A) docker rm all

B) docker container prune

C) docker clean

D) docker rm --all

14 / 30

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

A) Image signing and verification

B) A logging framework for containers

C) Encryption for container logs

D) Resource monitoring tools

15 / 30

15. What is an image ID in Docker?

A) A unique identifier for Docker Hub

B) A unique identifier for a container

C) A hash that uniquely identifies a Docker image

D) A tag assigned to an image

16 / 30

16. Which tool is used to resolve container names to IP addresses in Docker?

A) Docker DNS

B) DNS server

C) Network manager

D) Bridge resolver

17 / 30

17. What is the default storage driver for Docker on Linux?

A) Device Mapper

B) AUFS

C) Btrfs

D) OverlayFS

18 / 30

18. What is the default network type created when Docker is installed?

A) Host

B) None

C) Overlay

D) Bridge

19 / 30

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

A) Docker Hub

B) Docker Engine

C) Docker CLI

D) Docker Compose

20 / 30

20. Which of the following is a best practice to secure Docker containers?

A) Run containers as the root user

B) Allow unrestricted network access to containers

C) Store sensitive data in Dockerfiles

D) Use official and verified images

21 / 30

21. Which command is used to enable Docker Content Trust?

A) docker trust sign

B) export DOCKER_ENABLE_TRUST=1

C) docker trust enable

D) export DOCKER_CONTENT_TRUST=1

22 / 30

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

A) Alpine

B) Debian

C) Ubuntu

D) CentOS

23 / 30

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

A) To remove an image

B) To list all available images

C) To download an image from a registry

D) To create a new container

24 / 30

24. 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

25 / 30

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

A) A process of chaining multiple containers together

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 strategy for container scaling

26 / 30

26. What is the purpose of the docker-compose.override.yml file?

A) To automate image builds

B) To deploy containers

C) To replace Docker Compose

D) To define development-specific configurations

27 / 30

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

A) Host

B) Overlay

C) Bridge

D) None

28 / 30

28. What was Docker originally called during its development?

A) dotCloud

B) dotContainer

C) Container Engine

D) The Docker Project

29 / 30

29. What does the FROM instruction in a Dockerfile do?

A) Specifies the base image for the new Docker image

B) Copies files to the container

C) Sets the working directory in the container

D) Starts a new container

30 / 30

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

A) Runs the container in detached mode

B) Specifies the image tag to use

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

D) Runs multiple containers simultaneously

Your score is

The average score is 59%

Rate Your Experience!

Anonymous feedback

Thank you for your feedback! We appreciate your input.

MongoDB Quiz Test Online (30 random Questions)

10 Minutes CSS Quiz Test Online

10 Minutes Bootstrap Quiz Test Online

10 Minutes SQL Quiz Test Online

HTML Quiz Test Online

10 Minutes JavaScript Quiz Test Online

Related