Cloud Essentials Series – 24/Mar/2020


  • When an electric appliance needs power, we plug it in into socket
  • Electricity is readily available in our home but actuall generated over power stations
  • We pay the electricity bill for whatever we have used bcoz electricity is metered
  • If we apply the same analogy to software/information technology services, this is what cloud exactly does.

Pictorial Representation


Experiment: We are starting a new project for airline reservations

  • Sample architecture will be as shown below Preview

  • Number of Server required to run this architecture at a bare minimum are 5

    • Availability Checker
    • Booking Server
    • Ticket Generator
    • Database
    • Gateway
  • Where will these servers be located physically?

    • On-Premise Datacenter
  • What will you do if Database crashed? Preview

    • If the database is crashed whole application will be down
    • To resolve this, we will add a secondary database which has data in sync with primary database
    • Now even if primary db fails we can still run the show with secodary db Preview
  • What will happen if your datacenter has caught fire ?

    • This is Disaster and we need to have disaster recovery plan
    • Lets go with two datacenters in two locations of our enterprise Preview
    • Pros: Effective for Disaster
    • Cons: Costly and requires decent connectivity between two sites
    • Lets go with only storing the backup in other site Preview
    • Pros: Easy to implement
    • Cons: In Case of disaster, this approach takes lot of time to bring back application online
  • What will happen if the users to your application grow rapidly only during holiday season.

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