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 command removes all stopped containers?

A) docker container prune

B) docker rm --all

C) docker rm all

D) docker clean

2 / 30

2. What is the name of the tool used to define multi-container applications?

A) Docker Compose

B) Docker Hub

C) Docker CLI

D) Docker Engine

3 / 30

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

A) Providing a centralized location for Docker images

B) Logging container activity

C) Automating database migrations

D) Enabling container resource limits

4 / 30

4. Which of the following is NOT a recommended practice for running Docker containers in production?

A) Use the root user in containers

B) Keep container images updated

C) Limit container privileges

D) Define resource limits

5 / 30

5. What is a Docker container?

A) A runtime instance of a Docker image

B) A tool for building Docker images

C) A Docker registry

D) A virtual machine

6 / 30

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

A) Avoid specifying a base image

B) Include all debugging tools in the image

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

D) Use multi-stage builds and minimal base images

7 / 30

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

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

B) Runs the container in detached mode

C) Runs multiple containers simultaneously

D) Specifies the image tag to use

8 / 30

8. How can Docker images be scanned for vulnerabilities?

A) Using tools like Trivy or Docker Scan

B) Using docker image prune

C) By manually inspecting the Dockerfile

D) By running the container and checking logs

9 / 30

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

A) An active Docker subscription

B) A system with a hypervisor

C) A pre-installed Docker registry

D) A Linux distribution with kernel version 3.10 or higher

10 / 30

10. What happens if you try to remove a running container?

A) Docker archives the container.

B) The container is forcefully stopped and removed.

C) The container is removed without stopping it.

D) Docker throws an error.

11 / 30

11. Which command is used to remove a container?

A) docker remove <container-id>

B) docker rm <container-id>

C) docker rmi <container-id>

D) docker delete <container-id>

12 / 30

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

A) -i

B) Both B and C

C) --detach

D) -d

13 / 30

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

A) Hard-code them into the application code

B) Use Docker Secrets

C) Store them directly in the Dockerfile

D) Use environment variables

14 / 30

14. What is the primary purpose of the CMD instruction in a Dockerfile?

A) CMD provides default commands

B) CMD defines executable instructions

C) CMD is for environment variables

D) CMD sets the base image

15 / 30

15. Which key in the docker-compose.yml file is used to specify dependencies between services?

A) depends_on

B) volumes

C) networks

D) links

16 / 30

16. What happens if Docker is installed on a system without enough disk space?

A) Docker will disable image caching.

B) Docker will prompt for manual disk space allocation.

C) Docker will install but fail to run containers.

D) Docker will refuse to install.

17 / 30

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

A) Bridge

B) Overlay

C) Host

D) None

18 / 30

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

A) Overlay

B) Host

C) None

D) Bridge

19 / 30

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

A) Manages container dependencies automatically

B) Allows easy scaling of services

C) Provides built-in monitoring and alerting

D) Simplifies multi-container setup

20 / 30

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

A) Bridge

B) None

C) Host

D) Overlay

21 / 30

21. How do you limit CPU usage for a container?

A) --limit-cpu

B) --cpu-share

C) --cpus

D) --cpu-limit

22 / 30

22. What is an image ID in Docker?

A) A unique identifier for Docker Hub

B) A unique identifier for a container

C) A hash that uniquely identifies a Docker image

D) A tag assigned to an image

23 / 30

23. What is the function of cgroups in Docker?

A) Validates image signatures

B) Isolates containers on a network

C) Enforces resource limits for containers

D) Manages Swarm secrets

24 / 30

24. Which command optimizes the size of a Docker image by removing intermediate layers?

A) docker prune

B) docker optimize

C) docker build --squash

D) docker image clean

25 / 30

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

A) A method to create multiple images from a single Dockerfile

B) A strategy for container scaling

C) A technique to reduce image size by separating build and runtime stages

D) A process of chaining multiple containers together

26 / 30

26. Which of the following is NOT an advantage of multi-stage builds?

A) Simplifies build pipelines

B) Improves build performance

C) Enables real-time container monitoring

D) Reduces the final image size

27 / 30

27. Which command enables experimental features in Docker?

A) docker features enable

B) docker beta activate

C) docker experimental on

D) Add "experimental": "enabled" to ~/.docker/config.json

28 / 30

28. In which year was Docker initially released?

A) 2015

B) 2011

C) 2017

D) 2013

29 / 30

29. 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

30 / 30

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

A) docker logs <container-id>

B) docker ps --detail

C) docker inspect <container-id>

D) docker history <container-id>

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