What is a Docker?

• Platform that allows us to create containers

History

• You need to know what a server is

  

  More on Servers

• What is a server?

  • All the computer resources (CPU, RAM, and hard drive) were dedicated to one Operating system
  • If you install Windows in it, it becomes windows server
  • If you install Linux in it, it becomes linux server

Issues with servers?

• What if you want another operating system?
  • You will need to buy another physical server

Then came Virtual Machines

• concept of virtualization
  • Instead of installing one operating system, you install hypervisor

    • Hypervisor help us divide server resources into multiple servers

      • most famous hypervisor is VMWare

        

    • ie, VIRTUAL MACHINES VIRTUALIZE HARDWARE

Then came Containers (Docker)

• Docker helps us VIRTUALIZE OPERATING SYSTEM

• They replaced Virtual Machines

• Containers?

  • Micro computers
    • own OS
    • own CPU
    • own Memory

  

  • Lightening fast

Theoretical Definition of Containers

• Open-source Platform that allows you to
  • package your software along with dependencies
    • dependencies are the environment your need
      • OS?
      • Libraries?
      • Which version of libraries?
  • so that it can be reproduced in any hardware

Applications of Docker?

• Portability
• Increase Developer efficiency