Docker

Introduction

Docker is an open-source platform designed to automate the deployment, scaling, and management of applications using containerization.

Key Concepts:

• Container: A lightweight, standalone, and executable package that includes everything needed to run a piece of software—code, runtime, libraries, and system tools.

• Image: A read-only template used to create containers.

• Dockerfile: A script that contains instructions to build a Docker image.

• Docker Hub: A public registry where you can upload and download Docker images.

Why use Docker?

• Makes applications portable across environments (development, staging, production).

• Reduces issues like “it works on my machine.”

• Saves system resources compared to traditional virtual machines.

• Great for DevOps, CI/CD, and microservices architecture.