https://www.youtube.com/watch?v=pTFZFxd4hOI

What is Docker?

A platform for building , running and shipping applications.

your application wont work on a another computer for the following reasons

• One or more files missing
• software version mismatch
• different configuration settings

VMs Vs Containers

Container

• An Isolated environment for running an application
  • Allow running multiple apps in isolation
  • Are lightweight
  • Use OS of the host
  • start quickly
  • need less hardware resources

Virtual Machines

• An abstraction of a machine(physical hardware)

  • Each VM needs a full blown OS
  • Slow to start
  • resource intensive

  Docker Architecture

  

  container is a type of process

  

  

  windows comes with both linux and windows kernals hence we can run both windows and linux containers

  on linux we can run only linux containers

  on mac we use a linux VM to run linux containers