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

What is the base image in Docker?

A) A custom-built image from scratch

B) The default image used for all containers

C) The first layer of any Docker image

D) An empty Docker container

2 / 30

What is the purpose of the docker-compose.override.yml file?

A) To automate image builds

B) To replace Docker Compose

C) To deploy containers

D) To define development-specific configurations

3 / 30

Which of the following best describes a Dockerfile?

A) A configuration file for Docker CLI

B) A log file for tracking container events

C) A template for creating Docker images

D) A script for managing Docker networks

4 / 30

What is the service key used for in a docker-compose.yml file?

A) To configure environment variables

B) To define container networking

C) To specify individual services in the Compose setup

D) To link containers

5 / 30

What happens if multiple CMD instructions are used in a Dockerfile?

A) Only the first CMD instruction is executed.

B) Docker throws an error during the build process.

C) All CMD instructions are executed sequentially.

D) The last CMD instruction overrides the previous ones.

6 / 30

Which command lists all services defined in a Docker Compose file?

A) docker-compose show

B) docker-compose services

C) docker-compose ps

D) docker-compose ls

7 / 30

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

A) Bridge

B) Host

C) None

D) Overlay

8 / 30

What is the default base image for most Docker images?

A) Alpine

B) Ubuntu

C) CentOS

D) Debian

9 / 30

Which flag is used with docker-compose up to recreate containers even if they already exist?

A) --build

B) --recreate

C) --force

D) --reset

10 / 30

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

A) CMD provides default commands

B) CMD sets the base image

C) CMD is for environment variables

D) CMD defines executable instructions

11 / 30

How do you uninstall Docker on Linux?

A) Both B and C

B) apt-get remove docker-ce

C) yum remove docker

D) docker uninstall

12 / 30

How do you stop all running services managed by Docker Compose?

A) docker-compose terminate

B) docker-compose kill

C) docker-compose stop

D) docker-compose down

13 / 30

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

A) tmpfs

B) Bind Mounts

C) Overlay Network

D) NFS or External Storage Drivers

14 / 30

Which command removes all unused Docker images?

A) docker prune

B) docker clean

C) docker rmi

D) docker system prune

15 / 30

What is the default Docker image registry?

A) AWS Elastic Container Registry

B) Azure Container Registry

C) Docker Hub

D) Google Container Registry

16 / 30

What is the purpose of the -P flag in the docker run command?

A) To enable port forwarding

B) To pause the container after running

C) To automatically map container ports to random host ports

D) To publish ports explicitly

17 / 30

What is the role of namespaces in Docker?

A) To isolate resources within containers

B) To manage container healthchecks

C) To enable Swarm orchestration

D) To optimize image layers

18 / 30

What is the default working directory inside a container?

A) /root

B) /var

C) /home

D) / (root directory)

19 / 30

Which command starts the Docker service after installation on Linux?

A) systemctl enable docker

B) service docker enable

C) docker start

D) systemctl start docker

20 / 30

What is Docker Desktop?

A) A web-based Docker monitoring tool

B) A replacement for Docker Engine

C) A command-line interface for Docker

D) A GUI-based tool for Docker on Windows and macOS

21 / 30

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

A) RUN

B) ENTRYPOINT

C) WORKDIR

D) CMD

22 / 30

How can you enable Docker to start automatically on Linux?

A) systemctl enable docker

B) enable docker boot

C) service docker enable

D) docker --auto-start

23 / 30

What does a Docker image contain?

A) The runtime environment but not the code

B) Only the application code

C) The application, its dependencies, and configuration

D) Only configuration files

24 / 30

How do you inspect detailed information about a container?

A) docker ps --detail

B) docker logs <container-id>

C) docker history <container-id>

D) docker inspect <container-id>

25 / 30

What is the purpose of a Docker registry in a CI/CD workflow?

A) To orchestrate containers

B) To store and distribute Docker images

C) To manage container networking

D) To monitor container logs

26 / 30

What is Docker Swarm?

A) A Kubernetes alternative for managing containers

B) A tool for building multi-stage images

C) A feature for securing Docker containers

D) Docker's native clustering and orchestration tool

27 / 30

How does Docker ensure efficient use of system resources?

A) By using a shared kernel and containerization

B) By running all containers on different hosts

C) By allocating fixed memory to containers

D) By creating virtual machines

28 / 30

Who is the founder of Docker?

A) Brendan Burns

B) Linus Torvalds

C) Solomon Hykes

D) Kelsey Hightower

29 / 30

What is Docker Hub?

A) A physical server for storing Docker data

B) A cloud-based registry for Docker images

C) A tool for monitoring Docker containers

D) A command-line interface for Docker

30 / 30

What is the default user inside a Docker container?

A) System

B) Admin

C) Root

D) Docker

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