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Docker Interview Questions and Answers

Ques 1. What is Docker?

Docker is a containerization platform that allows developers to package, distribute, and run applications in isolated environments called containers.


docker run -d -p 80:80 nginx

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Ques 2. Explain the difference between an image and a container.

An image is a lightweight, standalone, and executable package that includes everything needed to run a piece of software. A container is an instance of a running image.


docker create my_image

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Ques 3. What is the purpose of Dockerfile?

Dockerfile is a script that contains instructions for building a Docker image. It specifies the base image, application code, dependencies, and other configurations.


FROM ubuntu
RUN apt-get update && apt-get install -y nginx

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Ques 4. How do you link containers in Docker?

Docker provides network options like --link and user-defined networks to connect containers. The --link option is now considered legacy, and user-defined networks are recommended.


docker network create my_network

docker run --network my_network --name container1 my_image1
docker run --network my_network --name container2 my_image2

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Ques 5. Explain Docker Compose.

Docker Compose is a tool for defining and running multi-container Docker applications. It uses a YAML file to configure the application's services, networks, and volumes.


version: '3'
    image: nginx
      - '80:80'

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