Importance of Docker and Kubernetes for Career

Understand Running Applications on Servers

• Consider this as your application architecture
  

Generation 1

• We procure physical servers with decent configuration and install necessary infrastructure to run our application
  
• Your application is using the hardware to run and utilization is low
• Costs involved are
  • For purchasing the servers before we deploy our application (Capex)
  • For maintaining the server during application is in use (opex)
• There are most likely chances that you under use your hardware

Generation 2

• Hypervisors came into existence.
• Hypervisors are the softwares installed on the physical machines which help you in creating virtual machines
• Examples: VmWare, Hyper-V, KVM, Virtual Box etc.
• VMWare became very populare which allows to create multiple vms on the same physical server. (Server Virtualization)
  

Generation 3: Docker

• Linux had a concept of containers from day 1, but it was difficult to create and very few organizations like google were using them.
• Docker made is simple to create containers
  
• Consider container as an isolated area with cpu, ram and network which makes application belive that it running on full blown os.
• Since containers are light weight we can run many instances on the server