DevOps Classroomnotes 01/Nov/2022

Generations of Running Applications

• Applications bring revenue, To make applications run we need servers.
• There are 3 major generations/approaches of running applications on servers
• Sample Application Architecture
  

Generation 1: Run directly on physical server

• Steps involved
  • Procecure Physical server (costs involved => capex)
  • Install Os (Licensing costs might be involved)
  • Deploy/install application & necessary softwares
• Problems:
  • In the cases of under usage, hardware resources are wasted and Return on Investment will be under question.
    

Generation 2: Hypervisors

• Install Hypervisor on Physical Server which will help in creating multiple virtual machines
  
• Hypervisor licensing costs are involved, inaddition to os costs

Generation 3: Containers

• Container is an isolated area created by container engine (docker) which has a lean os and application runs inside container.
• Each container gets
  • an ip address
  • cpu
  • RAM