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.

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

A) Use the docker-compose update command

B) Edit the container configuration manually

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

D) Restart the container

2 / 30

2. What is the command to check the status of Docker service on Linux?

A) service docker status

B) systemctl status docker

C) docker status

D) docker --status

3 / 30

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

A) docker-compose remove

B) docker-compose down

C) docker-compose destroy

D) docker-compose prune

4 / 30

4. What is the default working directory inside a container?

A) /root

B) / (root directory)

C) /var

D) /home

5 / 30

5. What is a dangling image in Docker?

A) An image with no associated tag

B) An image with large size

C) An image with vulnerabilities

D) An image stored in a remote registry

6 / 30

6. Which command is commonly used to build a Docker image in a CI/CD pipeline?

A) docker ps

B) docker run

C) docker pull

D) docker build

7 / 30

7. Which tool is commonly used for monitoring Docker containers in production?

A) Prometheus

B) Jenkins

C) Ansible

D) Terraform

8 / 30

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

A) Bridge

B) None

C) Host

D) Overlay

9 / 30

9. Which command is used to install Docker on a Debian-based system?

A) yum install docker

B) zypper install docker

C) apt install docker

D) apt-get install docker-ce

10 / 30

10. What is the role of the --cache-from flag in Docker build commands?

A) To scan images for vulnerabilities

B) To build multi-stage images

C) To use cached layers from a previous build

D) To clear image cache

11 / 30

11. Which installation method is recommended for Docker on cloud servers?

A) Using cloud-specific Docker images

B) Manual installation from binaries

C) Using virtual machines

D) Installing Docker Desktop

12 / 30

12. What is Docker Compose used for?

A) Building Docker images

B) Defining and running multi-container Docker applications

C) Managing container networking

D) Debugging Docker containers

13 / 30

13. How can you enable Docker to start automatically on Linux?

A) docker --auto-start

B) enable docker boot

C) service docker enable

D) systemctl enable docker

14 / 30

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

A) Both B and C

B) --detach

C) -i

D) -d

15 / 30

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

A) zypper install docker

B) yum install docker

C) brew install docker

D) apt-get install docker

16 / 30

16. What is the default network mode for Docker Compose services?

A) None

B) Bridge

C) Overlay

D) Host

17 / 30

17. What is the purpose of the docker.service file?

A) To store Docker configuration

B) To build Docker images

C) To connect Docker to registries

D) To manage Docker as a systemd service

18 / 30

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

A) Device Mapper

B) AUFS

C) OverlayFS

D) Btrfs

19 / 30

19. How do you define custom networks in Docker Compose?

A) Automatically generated by Compose

B) By defining them in the container

C) Under the networks key in docker-compose.yml

D) Using the docker network create command

20 / 30

20. Which command is used to create and start a container?

A) docker init

B) docker start

C) docker run

D) docker create

21 / 30

21. What command is used to add Docker’s official GPG key when installing on Linux?

A) docker-gpg add

B) wget -key

C) curl -fsSL

D) sudo key-add docker

22 / 30

22. How do you inspect detailed information about a container?

A) docker ps --detail

B) docker logs <container-id>

C) docker inspect <container-id>

D) docker history <container-id>

23 / 30

23. What is the minimum required version of Windows 10 to install Docker Desktop?

A) Version 2004

B) Version 1803

C) Version 1709

D) Version 1903

24 / 30

24. What is the function of Docker Healthchecks?

A) To validate container readiness and health

B) To monitor CPU and memory usage

C) To check Docker daemon status

D) To enforce network security policies

25 / 30

25. What is the function of the Docker --privileged flag?

A) Grants a container root access to the host

B) Sets resource limits for the container

C) Encrypts container data

D) Disables network communication for the container

26 / 30

26. What does the EXPOSE instruction in a Dockerfile do?

A) Specifies the ports the container listens on

B) Opens all container ports

C) Publishes a port to the host machine

D) Maps container ports to host ports

27 / 30

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

A) Dockerfile

B) JSON

C) XML

D) YAML

28 / 30

28. 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

29 / 30

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

A) CentOS

B) Alpine

C) Debian

D) Ubuntu

30 / 30

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

A) To map container ports to the host machine

B) To publish ports for the container

C) To specify ports the container listens on

D) To block all ports of the container

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