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

A) docker save <image>

B) docker push <image>

C) docker upload <image>

D) docker deploy <image>

2 / 30

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

A) docker volume prune

B) docker system prune

C) docker clean volumes

D) docker volume cleaD

3 / 30

3. What is the default user in a Docker container if none is specified?

A) Docker service user

B) Host system user

C) Non-root user

D) Root user

4 / 30

4. How can you scale a service using Docker Compose?

A) Using the docker-compose scale command

B) By adding replicas in docker-compose.yml

C) Using the --replicas flag with docker-compose up

D) Both A and B

5 / 30

5. How do you attach to a running container?

A) docker connect <container-id>

B) docker exec -it <container-id>

C) docker join <container-id>

D) docker attach <container-id>

6 / 30

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

A) Manages container networking

B) Enforces access control policies on containers

C) Scans Dockerfiles for vulnerabilities

D) Encrypts container images

7 / 30

7. What does the .dockerignore file do in a CI/CD process?

A) Lists the dependencies of the application

B) Specifies the image version to be used

C) Excludes files and directories from being added to a Docker image

D) Automates deployment of containers

8 / 30

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

A) It connects containers across hosts.

B) It prevents external access to the network.

C) It allows containers to bypass the DNS.

D) It enables encrypted communication.

9 / 30

9. What does Docker use to optimize image layers?

A) Hypervisor technology

B) Virtual memory

C) Layer caching

D) Volume mapping

10 / 30

10. What is the default working directory inside a container?

A) /root

B) / (root directory)

C) /home

D) /var

11 / 30

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

A) --secure

B) --tls

C) --encrypted

D) --driver overlay --opt encrypted

12 / 30

12. On which Linux distributions is Docker officially supported?

A) Most major distributions, including Ubuntu, CentOS, Fedora, and Debian

B) Only Ubuntu and CentOS

C) Only Debian-based distributions

D) Only Red Hat-based distributions

13 / 30

13. How does Docker simplify CI/CD pipelines?

A) By reducing the need for code reviews

B) By replacing version control systems

C) By providing consistent environments for development, testing, and production

D) By eliminating the need for orchestration tools

14 / 30

14. How can you verify if Docker is installed correctly on your system?

A) docker verify

B) docker run

C) docker --version

D) docker test

15 / 30

15. Which flag is used to run a container in detached mode?

A) --detach

B) -d

C) Both B and C

D) -i

16 / 30

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

A) Docker Engine

B) Docker Compose

C) Docker CLI

D) Docker Hub

17 / 30

17. What is the default network driver used by Docker Compose?

A) Bridge

B) Host

C) None

D) Overlay

18 / 30

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

A) Restricts the container's memory usage

B) Prevents a container from gaining additional privileges

C) Prevents the container from being restarted

D) Disables network access for the container

19 / 30

19. What is the purpose of container ports in Docker?

A) To run multiple containers in parallel

B) To debug the container

C) To enable network communication between the container and host

D) To provide persistent storage

20 / 30

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

A) Overlay

B) Bridge

C) Host

D) None

21 / 30

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

A) TLS certificates

B) API keys for Kubernetes

C) Multi-stage build configurations

D) Encrypted secrets for services

22 / 30

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

A) To save disk space

B) To streamline and standardize deployments

C) To develop code faster

D) To replace virtual machines entirely

23 / 30

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

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

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

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

D) Docker uses hypervisors; VMs do not.

24 / 30

24. What is Docker Compose used for?

A) Defining and running multi-container Docker applications

B) Debugging Docker containers

C) Managing container networking

D) Building Docker images

25 / 30

25. Where are Docker images stored locally by default?

A) /etc/docker/images

B) /var/lib/docker

C) /var/docker/images

D) /usr/lib/docker

26 / 30

26. How do you inspect detailed information about a container?

A) docker history <container-id>

B) docker logs <container-id>

C) docker ps --detail

D) docker inspect <container-id>

27 / 30

27. Which command removes all unused Docker images?

A) docker prune

B) docker clean

C) docker system prune

D) docker rmi

28 / 30

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

A) service docker status

B) docker --status

C) docker status

D) systemctl status docker

29 / 30

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

A) compose.yaml

B) compose.json

C) docker-compose.yml

D) docker.yml

30 / 30

30. How do you uninstall Docker on Linux?

A) docker uninstall

B) apt-get remove docker-ce

C) Both B and C

D) yum remove docker

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