Docker Quiz Test Online (30 random Questions) 2025

This quick 45-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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45 Minutes Docker Quiz Test Online

Welcome to the Docker Quiz! This quick 45-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 checkpoint feature do?

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

B) Creates a backup of a container's state

C) Restarts a container automatically

D) Monitors resource usage of a container

2 / 30

2. 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

3 / 30

3. What is the function of Docker Healthchecks?

A) To check Docker daemon status

B) To validate container readiness and health

C) To monitor CPU and memory usage

D) To enforce network security policies

4 / 30

4. What is the recommended way to store sensitive information like passwords in Docker production environments?

A) Use environment variables

B) Hard-code them into the application code

C) Store them directly in the Dockerfile

D) Use Docker Secrets

5 / 30

5. What is an image ID in Docker?

A) A unique identifier for a container

B) A unique identifier for Docker Hub

C) A hash that uniquely identifies a Docker image

D) A tag assigned to an image

6 / 30

6. Which command lists all the locally available Docker images?

A) docker ps

B) docker inspect

C) docker ls

D) docker images

7 / 30

7. Which command optimizes the size of a Docker image by removing intermediate layers?

A) docker prune

B) docker optimize

C) docker build --squash

D) docker image clean

8 / 30

8. What is the default Docker image registry?

A) Google Container Registry

B) Docker Hub

C) AWS Elastic Container Registry

D) Azure Container Registry

9 / 30

9. How do you execute a command inside a running container managed by Docker Compose?

A) docker-compose exec

B) docker-compose run

C) docker attach

D) docker exec

10 / 30

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

A) docker history <container-id>

B) docker inspect <container-id>

C) docker view <container-id>

D) docker logs <container-id>

11 / 30

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

A) Include all debugging tools in the image

B) Avoid specifying a base image

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

D) Use multi-stage builds and minimal base images

12 / 30

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

A) Store secrets in environment variables

B) Limit container privileges using --cap-drop

C) Use a minimal base image

D) Regularly update Docker images

13 / 30

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

A) docker ip <container>

B) docker network ip

C) docker inspect <container>

D) docker ps

14 / 30

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

A) Bind Mounts

B) NFS or External Storage Drivers

C) Overlay Network

D) tmpfs

15 / 30

15. What is the primary reason for setting resource limits in Docker containers?

A) To prevent containers from exhausting host resources

B) To enable container orchestration

C) To restrict unauthorized network access

D) To improve the container's performance

16 / 30

16. Which of the following best describes a Dockerfile?

A) A script for managing Docker networks

B) A log file for tracking container events

C) A template for creating Docker images

D) A configuration file for Docker CLI

17 / 30

17. What is the role of --internal in Docker networks?

A) It enables encrypted communication.

B) It connects containers across hosts.

C) It prevents external access to the network.

D) It allows containers to bypass the DNS.

18 / 30

18. Which command is used to prune unused volumes in Docker?

A) docker clean volumes

B) docker volume cleaD

C) docker system prune

D) docker volume prune

19 / 30

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

A) To increase the number of layers in the image

B) To improve container startup time

C) To automatically deploy containers

D) To reduce image size and exclude unnecessary dependencies

20 / 30

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

A) yum install docker

B) apt-get install docker

C) brew install docker

D) zypper install docker

21 / 30

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

A) Docker CLI

B) Docker Compose

C) Docker Engine

D) Docker Hub

22 / 30

22. What is the default user inside a Docker container?

A) System

B) Root

C) Docker

D) Admin

23 / 30

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

A) To publish ports explicitly

B) To pause the container after running

C) To enable port forwarding

D) To automatically map container ports to random host ports

24 / 30

24. What is the main purpose of resource limits in Docker?

A) To prevent container logs from exceeding a size limit

B) To reduce image size

C) To ensure fair resource allocation across containers

D) To encrypt communication between containers

25 / 30

25. What is the difference between a Docker image and a container?

A) Images store logs, while containers run processes

B) A container is a running instance of an image

C) Containers and images are the same

D) An image is a running instance of a container

26 / 30

26. What was the primary reason for developing Docker?

A) To improve hardware virtualization

B) To simplify software deployment and ensure consistency across environments

C) To replace virtual machines entirely

D) To create a new programming language

27 / 30

27. How does Docker ensure efficient use of system resources?

A) By allocating fixed memory to containers

B) By creating virtual machines

C) By running all containers on different hosts

D) By using a shared kernel and containerization

28 / 30

28. What was Docker originally called during its development?

A) dotContainer

B) The Docker Project

C) Container Engine

D) dotCloud

29 / 30

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

A) Jenkins

B) Docker Compose

C) Terraform

D) Kubernetes

30 / 30

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

A) YAML

B) Dockerfile

C) JSON

D) XML

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