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 disables all networking for a container?

A) Host

B) Overlay

C) None

D) Bridge

2 / 30

2. Which is a best practice for updating a Docker container in production?

A) Modify the container directly using exec

B) Pull the latest image and restart the container

C) Create a new container with the updated image and replace the old one

D) Update the container's base image

3 / 30

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

A) Use Docker Secrets

B) Hard-code them into the application code

C) Use environment variables

D) Store them directly in the Dockerfile

4 / 30

4. Where are Docker images stored locally by default?

A) /var/docker/images

B) /etc/docker/images

C) /var/lib/docker

D) /usr/lib/docker

5 / 30

5. Which Docker logging driver is commonly used in production for centralized log management?

A) none

B) JSON-file

C) Fluentd

D) syslog

6 / 30

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

A) RUN

B) ENTRYPOINT

C) WORKDIR

D) CMD

7 / 30

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

A) Always

B) On-failure

C) No

D) Unless-stopped

8 / 30

8. What is the default filename for Docker Compose configuration?

A) compose.json

B) compose.yaml

C) docker.yml

D) docker-compose.yml

9 / 30

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

A) docker ps

B) docker pull

C) docker run

D) docker build

10 / 30

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

A) Optimizing Docker images by using intermediate stages to reduce image size

B) Building multiple containers simultaneously

C) Using multiple base images in a single Dockerfile

D) Running multiple containers in parallel

11 / 30

11. Which command starts the Docker service after installation on Linux?

A) systemctl start docker

B) docker start

C) systemctl enable docker

D) service docker enable

12 / 30

12. What is Docker Hub?

A) A tool for monitoring Docker containers

B) A cloud-based registry for Docker images

C) A command-line interface for Docker

D) A physical server for storing Docker data

13 / 30

13. How do you limit memory usage for a container?

A) --ram

B) --memory

C) --mem-limit

D) --limit-mem

14 / 30

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

A) docker status

B) service docker status

C) docker --status

D) systemctl status docker

15 / 30

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

A) A system with a hypervisor

B) An active Docker subscription

C) A Linux distribution with kernel version 3.10 or higher

D) A pre-installed Docker registry

16 / 30

16. What was the primary reason for developing Docker?

A) To replace virtual machines entirely

B) To improve hardware virtualization

C) To simplify software deployment and ensure consistency across environments

D) To create a new programming language

17 / 30

17. What is the purpose of the docker network inspect command?

A) To delete a network

B) To connect a container to a network

C) To view detailed information about a network

D) To create a new network

18 / 30

18. What is the main use case for the --link flag in Docker?

A) Connecting containers for legacy applications

B) Encrypting container communication

C) Creating a new network

D) Connecting containers on different networks

19 / 30

19. What is the base image in Docker?

A) The first layer of any Docker image

B) The default image used for all containers

C) A custom-built image from scratch

D) An empty Docker container

20 / 30

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

A) Maps container ports to host ports

B) Publishes a port to the host machine

C) Opens all container ports

D) Specifies the ports the container listens on

21 / 30

21. What is the purpose of AppArmor in Docker?

A) To enforce security profiles for containers

B) To manage container logs

C) To restrict container resource usage

D) To provide network isolation

22 / 30

22. Why is tagging Docker images important in CI/CD pipelines?

A) To reduce image size

B) To uniquely identify and version images

C) To improve build speed

D) To encrypt image layers

23 / 30

23. Which command lists all available Docker networks?

A) docker network list

B) docker network inspect

C) docker network ls

D) docker networks

24 / 30

24. How do you push a Docker image to Docker Hub?

A) docker push <image>

B) docker upload <image>

C) docker deploy <image>

D) docker save <image>

25 / 30

25. What is the primary purpose of Docker volumes?

A) To provide persistent storage for containers

B) To manage network configurations

C) To monitor container performance

D) To share images between containers

26 / 30

26. What is the function of the --no-new-privileges flag?

A) Disables network access for the container

B) Restricts the container's memory usage

C) Prevents a container from gaining additional privileges

D) Prevents the container from being restarted

27 / 30

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

A) To deploy a stack of containers

B) To initialize Docker networking

C) To deploy services in a Docker Swarm cluster

D) To create a multi-stage Dockerfile

28 / 30

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

A) To list all available images

B) To remove an image

C) To create a new container

D) To download an image from a registry

29 / 30

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

A) It is automatically deleted.

B) It is moved to an archive.

C) It cannot be restarted.

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

30 / 30

30. What is the default port on which Docker Daemon listens for API requests?

A) 443

B) 8080

C) 2375

D) 22

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