Introduction to Docker

What is Docker?

• Docker is a platform for building, shipping, and running applications inside containers.
• A container is like a lightweight, portable box that packages your app with everything it needs to run (code, libraries, configs).
• Containers run the same way everywhere — on your laptop, on a server, or in the cloud.

Think of it as a "package box for your app" that works the same everywhere.

Brief History of Docker

• 2013: Docker was introduced as an open-source project by a company called dotCloud.
• Later, dotCloud changed its name to Docker Inc. due to the project's success.
• It popularized container technology, which existed before but wasn’t as easy or standardized.
• Today, Docker is widely used across the world in both small and large-scale applications.

Benefits of Using Docker

1. Portability
   • Works the same on any machine or environment.
   • "It works on my machine" problem goes away.
2. Lightweight
   • Uses fewer resources than full virtual machines (VMs).
   • Starts up quickly.
3. Isolation
   • Each container runs independently — no conflicts between apps.
4. Consistency
   • Same environment in development, testing, and production.
5. Speed & Efficiency
   • Fast deployments, easier updates, and scaling.