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 package manager is used to install Docker on Red Hat-based systems?

A) apt

B) pacman

C) yum

D) zypper

2 / 30

2. Which network driver disables all networking for a container?

A) Bridge

B) Host

C) None

D) Overlay

3 / 30

3. Which feature in Docker provides secure image signing and verification?

A) Image Lock

B) Docker Security Scanner

C) Docker Shield

D) Content Trust

4 / 30

4. How does Docker Compose enhance CI/CD workflows?

A) By creating Docker images

B) By pulling images from registries

C) By replacing CI/CD tools like Jenkins

D) By orchestrating multi-container applications

5 / 30

5. Which command is used to enable Docker Content Trust?

A) docker trust enable

B) export DOCKER_ENABLE_TRUST=1

C) export DOCKER_CONTENT_TRUST=1

D) docker trust sign

6 / 30

6. What is the function of the Docker --privileged flag?

A) Grants a container root access to the host

B) Encrypts container data

C) Disables network communication for the container

D) Sets resource limits for the container

7 / 30

7. Which Docker version is free to use for individuals and small businesses?

A) Docker Enterprise Edition (EE)

B) Docker Community Edition (CE)

C) Docker Desktop Enterprise

D) Docker Pro

8 / 30

8. Which command removes all unused Docker images?

A) docker rmi

B) docker clean

C) docker prune

D) docker system prune

9 / 30

9. Which command removes all stopped containers?

A) docker clean

B) docker container prune

C) docker rm --all

D) docker rm all

10 / 30

10. How do you define custom networks in Docker Compose?

A) Under the networks key in docker-compose.yml

B) Automatically generated by Compose

C) By defining them in the container

D) Using the docker network create command

11 / 30

11. What is the default logging driver in Docker?

A) JSON-file

B) Journald

C) syslog

D) Fluentd

12 / 30

12. What is the primary benefit of using Docker Hub in a CI/CD process?

A) Logging container activity

B) Enabling container resource limits

C) Providing a centralized location for Docker images

D) Automating database migrations

13 / 30

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

A) Ubuntu

B) Debian

C) Alpine

D) CentOS

14 / 30

14. How can you disconnect a container from a network?

A) docker remove <network>

B) docker detach <network>

C) docker disconnect <network> <container>

D) docker network disconnect <network> <container>

15 / 30

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

A) --mem-limit

B) --memory

C) --ram

D) --limit-mem

16 / 30

16. What does the docker tag command do?

A) Assigns a tag to a Docker image

B) Builds a new Docker image

C) Pushes an image to a registry

D) Deletes a Docker image

17 / 30

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

A) To improve the container's performance

B) To enable container orchestration

C) To restrict unauthorized network access

D) To prevent containers from exhausting host resources

18 / 30

18. What is the main advantage of Docker?

A) Faster development cycles

B) Better database management

C) Enhanced hardware performance

D) Improved debugging tools

19 / 30

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

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

B) Running multiple containers in parallel

C) Using multiple base images in a single Dockerfile

D) Building multiple containers simultaneously

20 / 30

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

A) Specifies the image version to be used

B) Lists the dependencies of the application

C) Automates deployment of containers

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

21 / 30

21. What is the default network type created when Docker is installed?

A) None

B) Bridge

C) Overlay

D) Host

22 / 30

22. How do you specify environment variables in a Docker Compose file?

A) Using the environment key

B) Using the variables key

C) Using the env key

D) Using the config key

23 / 30

23. Why is it recommended to use read-only containers in production?

A) To improve container build times

B) To simplify debugging

C) To enforce immutability and enhance security

D) To reduce the size of the image

24 / 30

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

A) Creating a new network

B) Connecting containers on different networks

C) Connecting containers for legacy applications

D) Encrypting container communication

25 / 30

25. How do you attach to a running container?

A) docker join <container-id>

B) docker connect <container-id>

C) docker exec -it <container-id>

D) docker attach <container-id>

26 / 30

26. What is the function of cgroups in Docker?

A) Enforces resource limits for containers

B) Isolates containers on a network

C) Manages Swarm secrets

D) Validates image signatures

27 / 30

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

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

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

C) Docker uses hypervisors; VMs do not.

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

28 / 30

28. What is a Docker container?

A) A runtime instance of a Docker image

B) A virtual machine

C) A Docker registry

D) A tool for building Docker images

29 / 30

29. In a CI/CD pipeline, what is the purpose of the docker push command?

A) To upload a Docker image to a container registry

B) To build a Docker image

C) To run a container

D) To stop a running container

30 / 30

30. Which of the following is a best practice to secure Docker containers?

A) Use official and verified images

B) Store sensitive data in Dockerfiles

C) Allow unrestricted network access to containers

D) Run containers as the root user

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