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. What is the purpose of the COPY instruction in a Dockerfile?

A) To copy files from the local machine to the image during build

B) To copy files from one container to another

C) To create a backup of the Docker image

D) To move files within the container

2 / 30

2. What is a Docker container?

A) A tool for monitoring application performance

B) A lightweight, standalone executable package for software

C) A physical server for running applications

D) A virtual machine for hosting databases

3 / 30

3. What is the role of SELinux in Docker security?

A) Scans Dockerfiles for vulnerabilities

B) Manages container networking

C) Enforces access control policies on containers

D) Encrypts container images

4 / 30

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

A) Deletes the container after it stops

B) Runs the container in detached mode

C) Stops the container after execution

D) Runs the container in interactive mode

5 / 30

5. What is the primary difference between Docker and virtual machines?

A) Docker supports only Linux, while VMs support all OS types.

B) Docker uses hypervisors; VMs do not.

C) Docker containers share the host OS, while VMs include a full OS.

D) VMs are lightweight, while Docker containers are not.

6 / 30

6. What is Docker Compose used for?

A) Managing container networking

B) Defining and running multi-container Docker applications

C) Building Docker images

D) Debugging Docker containers

7 / 30

7. Which command displays container resource usage statistics?

A) docker logs

B) docker inspect

C) docker stats

D) docker monitor

8 / 30

8. What is an image ID in Docker?

A) A tag assigned to an image

B) A unique identifier for a container

C) A hash that uniquely identifies a Docker image

D) A unique identifier for Docker Hub

9 / 30

9. What is the purpose of AppArmor in Docker?

A) To enforce security profiles for containers

B) To manage container logs

C) To provide network isolation

D) To restrict container resource usage

10 / 30

10. Which command lists the logs of all services in Docker Compose?

A) docker-compose events

B) docker-compose status

C) docker-compose show

D) docker-compose logs

11 / 30

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

A) A container is a running instance of an image

B) An image is a running instance of a container

C) Images store logs, while containers run processes

D) Containers and images are the same

12 / 30

12. How do you stop a running Docker container?

A) docker terminate <container-id>

B) docker stop <container-id>

C) docker end <container-id>

D) docker pause <container-id>

13 / 30

13. How can you restart a stopped container?

A) docker restart <container-id>

B) docker run <container-id>

C) docker start <container-id>

D) docker init <container-id>

14 / 30

14. What is the default Docker image registry?

A) Docker Hub

B) AWS Elastic Container Registry

C) Google Container Registry

D) Azure Container Registry

15 / 30

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

A) Host

B) None

C) Bridge

D) OverlaC

16 / 30

16. What does the -it flag do in the docker run command?

A) Runs multiple containers simultaneously

B) Specifies the image tag to use

C) Runs the container in detached mode

D) Allocates a pseudo-TTY and keeps the container interactive

17 / 30

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

A) RUN

B) WORKDIR

C) ENTRYPOINT

D) CMD

18 / 30

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

A) To streamline and standardize deployments

B) To replace virtual machines entirely

C) To develop code faster

D) To save disk space

19 / 30

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

A) Network manager

B) Bridge resolver

C) DNS server

D) Docker DNS

20 / 30

20. What happens if you use docker build without a tag?

A) The image is tagged with the username

B) The image is built without a tag

C) Docker assigns a default tag of latest

D) The build will fail

21 / 30

21. Which of the following is a common step in Docker-based CI/CD pipelines?

A) Image scanning for vulnerabilities

B) Container orchestration

C) All of the above

D) Image version tagging

22 / 30

22. 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

23 / 30

23. What is the primary technology that Docker builds upon?

A) Hypervisors

B) Linux kernel features like namespaces and cgroups

C) Hardware virtualization

D) Virtual machine emulation

24 / 30

24. How do you pause a running container?

A) docker freeze <container-id>

B) docker hold <container-id>

C) docker stop <container-id>

D) docker pause <container-id>

25 / 30

25. How do you list all running containers?

A) docker list

B) docker show

C) docker ps

D) docker containers

26 / 30

26. What was Docker originally called during its development?

A) dotContainer

B) The Docker Project

C) Container Engine

D) dotCloud

27 / 30

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

A) zypper install docker

B) apt-get install docker

C) yum install docker

D) brew install docker

28 / 30

28. Which file format is typically used to define CI/CD pipelines in GitLab CI/CD?

A) docker-compose.yml

B) gitlab-ci.yml

C) pipeline.yml

D) config.json

29 / 30

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

A) --driver overlay --opt encrypted

B) --tls

C) --secure

D) --encrypted

30 / 30

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

A) Avoiding resource limits

B) Relying on container logs

C) Using monitoring tools like cAdvisor or Prometheus

D) Using built-in Docker commands

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