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. What is the primary goal of using Docker in production?

A) To replace virtual machines entirely

B) To save disk space

C) To streamline and standardize deployments

D) To develop code faster

2 / 30

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

A) Ubuntu

B) Debian

C) Alpine

D) CentOS

3 / 30

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

A) Store them directly in the Dockerfile

B) Use Docker Secrets

C) Use environment variables

D) Hard-code them into the application code

4 / 30

4. How do you tag a Docker image during the build process?

A) By using the -name flag

B) By using the -t flag

C) By using the --image flag

D) By renaming the Dockerfile

5 / 30

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

A) Use multi-stage builds and minimal base images

B) Include all debugging tools in the image

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

D) Avoid specifying a base image

6 / 30

6. How do you specify a custom subnet when creating a Docker network?

A) docker network create --mask=<subnet>

B) docker network create --subnet=<subnet>

C) docker network create --ip-range=<subnet>

D) docker network create --cidr=<subnet>

7 / 30

7. What does the docker tag command do?

A) Deletes a Docker image

B) Pushes an image to a registry

C) Assigns a tag to a Docker image

D) Builds a new Docker image

8 / 30

8. What prerequisite must be installed before installing Docker on Windows?

A) VirtualBox

B) Microsoft Edge

C) Hyper-V

D) Windows PowerShell

9 / 30

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

A) It prevents multi-stage builds

B) It increases image size

C) It slows down container startup

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

10 / 30

10. How can Docker images be scanned for vulnerabilities?

A) By running the container and checking logs

B) Using docker image prune

C) By manually inspecting the Dockerfile

D) Using tools like Trivy or Docker Scan

11 / 30

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

A) service docker enable

B) enable docker boot

C) docker --auto-start

D) systemctl enable docker

12 / 30

12. What does the docker-compose up command do in a CI/CD process?

A) Pulls images from the Docker registry

B) Starts and runs all services defined in a Compose file

C) Builds Docker images only

D) Stops all running containers

13 / 30

13. What is a Docker container?

A) A Docker registry

B) A tool for building Docker images

C) A virtual machine

D) A runtime instance of a Docker image

14 / 30

14. Which network driver is required for Docker Swarm to function?

A) Overlay

B) None

C) Bridge

D) Host

15 / 30

15. What is the best way to monitor container resource usage in production?

A) Avoiding resource limits

B) Using built-in Docker commands

C) Relying on container logs

D) Using monitoring tools like cAdvisor or Prometheus

16 / 30

16. What does the -d option in the docker run command do?

A) Runs the container in detached mode

B) Deletes the container after it stops

C) Stops the container after execution

D) Runs the container in interactive mode

17 / 30

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

A) NFS or External Storage Drivers

B) Overlay Network

C) Bind Mounts

D) tmpfs

18 / 30

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

A) By monitoring container health

B) By creating snapshots of running containers

C) By using a versioned Docker image from the registry

D) By saving previous container logs

19 / 30

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

A) Host

B) Bridge

C) None

D) Overlay

20 / 30

20. Which of the following tools can help enforce Docker image security policies?

A) Docker Compose

B) Jenkins

C) Docker Content Trust

D) Kubernetes

21 / 30

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

A) To connect a container to a network

B) To view detailed information about a network

C) To delete a network

D) To create a new network

22 / 30

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

A) To list all available images

B) To create a new container

C) To download an image from a registry

D) To remove an image

23 / 30

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

A) zypper install docker

B) yum install docker

C) apt-get install docker-ce

D) apt install docker

24 / 30

24. What is the purpose of the docker save command?

A) To store an image in Docker Hub

B) To save logs of a container

C) To export an image as a tar file

D) To save a container's state

25 / 30

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

A) Manages container dependencies automatically

B) Simplifies multi-container setup

C) Provides built-in monitoring and alerting

D) Allows easy scaling of services

26 / 30

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

A) Using the --name flag

B) Using the --id flag

C) Using the -t flag

D) By renaming the Dockerfile

27 / 30

27. Which of the following is NOT a component of Docker architecture?

A) Virtual Machine Manager

B) Docker Engine

C) Docker Daemon

D) Docker CLI

28 / 30

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

A) Version 1709

B) Version 1903

C) Version 1803

D) Version 2004

29 / 30

29. Which command updates a running service in Docker Compose?

A) docker-compose update

B) docker-compose redeploy

C) docker-compose restart

D) docker-compose up

30 / 30

30. How can you restart a stopped container?

A) docker init <container-id>

B) docker start <container-id>

C) docker restart <container-id>

D) docker run <container-id>

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