Docker Image

A Docker Image is a read-only blueprint/template used to create a Docker Container.

• Image = What to run
• Container = Running version of that image

What does a Docker Image contain?

• Application code
• Runtime (Java / Node / Python)
• Libraries and dependencies
• Configuration
• OS-level instructions

Everything needed to run the app is packed inside the image.

Docker Architecture

Docker follows a Client-Server Architecture.

Main Components

1. Docker Client
2. Docker Daemon
3. Docker Images
4. Docker Containers