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

A) Host

B) Bridge

C) Overlay

D) None

2 / 30

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

A) Terraform

B) Jenkins

C) Prometheus

D) Ansible

3 / 30

3. What is the purpose of AppArmor in Docker?

A) To provide network isolation

B) To enforce security profiles for containers

C) To restrict container resource usage

D) To manage container logs

4 / 30

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

A) Network manager

B) DNS server

C) Bridge resolver

D) Docker DNS

5 / 30

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

A) docker run

B) docker build

C) docker create

D) docker pull

6 / 30

6. What does the docker secret command manage in a Docker Swarm?

A) TLS certificates

B) API keys for Kubernetes

C) Encrypted secrets for services

D) Multi-stage build configurations

7 / 30

7. Which of the following is NOT an advantage of Docker Compose?

A) Simplifies multi-container setup

B) Allows easy scaling of services

C) Provides built-in monitoring and alerting

D) Manages container dependencies automatically

8 / 30

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

A) Using the docker network create command

B) Automatically generated by Compose

C) By defining them in the container

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

9 / 30

9. Which key in the docker-compose.yml file is used to specify dependencies between services?

A) volumes

B) depends_on

C) networks

D) links

10 / 30

10. What is the purpose of the docker-compose plugin during installation?

A) To manage multi-container applications

B) To manage single-container applications

C) To debug Docker containers

D) To update Docker images

11 / 30

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

A) It prevents multi-stage builds

B) It increases image size

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

D) It slows down container startup

12 / 30

12. What does the docker stack ps command display?

A) Logs of a stack's services

B) Status of tasks in a stack

C) Running containers in a stack

D) Health status of the stack

13 / 30

13. Where are Docker images stored locally by default?

A) /var/lib/docker

B) /var/docker/images

C) /etc/docker/images

D) /usr/lib/docker

14 / 30

14. What does a Docker image contain?

A) Only the application code

B) Only configuration files

C) The runtime environment but not the code

D) The application, its dependencies, and configuration

15 / 30

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

A) Use official and verified images

B) Allow unrestricted network access to containers

C) Store sensitive data in Dockerfiles

D) Run containers as the root user

16 / 30

16. What is the purpose of the volumes key in a docker-compose.yml file?

A) To configure network settings

B) To map container storage to the host system

C) To define the storage backend for Docker

D) To link containers

17 / 30

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

A) To manage Docker as a systemd service

B) To store Docker configuration

C) To connect Docker to registries

D) To build Docker images

18 / 30

18. What happens if Docker is installed on a system without enough disk space?

A) Docker will install but fail to run containers.

B) Docker will prompt for manual disk space allocation.

C) Docker will refuse to install.

D) Docker will disable image caching.

19 / 30

19. What is the primary purpose of the ENTRYPOINT instruction in a Dockerfile?

A) ENTRYPOINT provides default commands

B) ENTRYPOINT defines executable instructions

C) ENTRYPOINT is for environment variables

D) ENTRYPOINT sets the base image

20 / 30

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

A) --tls

B) --secure

C) --encrypted

D) --driver overlay --opt encrypted

21 / 30

21. How can Docker ensure application rollback in a CI/CD pipeline?

A) By using a versioned Docker image from the registry

B) By monitoring container health

C) By saving previous container logs

D) By creating snapshots of running containers

22 / 30

22. Which storage option allows Docker volumes to persist across host machines?

A) Overlay Network

B) NFS or External Storage Drivers

C) tmpfs

D) Bind Mounts

23 / 30

23. Which networking mode provides the highest level of isolation for Docker containers?

A) Bridge

B) OverlaC

C) None

D) Host

24 / 30

24. What is a dangling image in Docker?

A) An image with vulnerabilities

B) An image with no associated tag

C) An image stored in a remote registry

D) An image with large size

25 / 30

25. Which instruction in a Dockerfile is used to run a command during the build process?

A) CMD

B) ENTRYPOINT

C) RUN

D) WORKDIR

26 / 30

26. Which tool is required to run Docker on Windows 10 Home edition?

A) VMWare Workstation

B) VirtualBox

C) WSL 1

D) WSL 2

27 / 30

27. How do you name a container when running it?

A) By renaming the Dockerfile

B) Using the --name flag

C) Using the -t flag

D) Using the --id flag

28 / 30

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

A) Specifies the ports the container listens on

B) Publishes a port to the host machine

C) Opens all container ports

D) Maps container ports to host ports

29 / 30

29. Who is the founder of Docker?

A) Brendan Burns

B) Linus Torvalds

C) Solomon Hykes

D) Kelsey Hightower

30 / 30

30. What is the purpose of the context key in the docker-compose.yml file?

A) To define environment variables

B) To specify container dependencies

C) To set the working directory of the container

D) To specify the build location for the Dockerfile

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