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Cloud Computing Basics

Before moving to Cloud, we need to know HyperVisior

HyperVisior (VM)

Piece of Computer software, firmware or hardware that creates & runs VM

There are two main hypervisor types, referred to as “Type 1” (or “bare metal”) and “Type 2” (or “hosted”).

  • A type 1 hypervisor acts like a lightweight operating system and runs directly on the host’s hardware

    • Zen Server,
    • ESXi(VMware),
    • HyperV (MS),
    • Citrix, KVM (OpenSource)

  • A type 2 hypervisor runs as a software layer on an operating system, like other computer programs.

    • For Testing purposes
    • Install on OS (Windows 10/ /Linux)
      • Oracle VirtualBox
      • VMware Work Station
      • MS Virtual PC
      • HyperV (MS)

Host Machine & Guest Machine

A Computer on which a HyperVisior runs one or more VMs called Host Machine Each VM is called Guest Machine

Issues with Servers

No efficient utilization of resources (CPU, Memory), Most of the time resources were being wasted.

Issues with VMs

For any upgrade in resources all VMs should be turn off

Virtualization

Act of creating a virtual version of something (OS, Storage, network)

Cloud Computing

  • Using on-demand Computing resources outside your premises
  • Includes
    • compute - Cluster HV
    • network - Router Switch
    • DB - Database
    • Storage - NAS , DAS

Advantages & Characteristics of Cloud Computing

- on-demand

  • Avalailble when needed
  • No SPOF
    • No Single Point of Failure
  • Scalable
    • Verticle - adding capacity in existing resources
    • Horizontal - adding more resources
  • PAYG
    • Pay As You Go ( Pay what you use )
  • Agile
    • Go global in minutes
    • Can be live in different locations
  • HA
    • High Avalailblity related to Server
    • Durable related to Storage (SSD)
  • Secure
    • Of the Cloud = Physical security
    • In the Cloud = Securing cloud you made

Type of cloud

  • Public
    • Avalailble for everyone & on internet
      • AWS, Google, Azure, AliBaba, Azure
  • Private
    • Made in your Datacenter for use or selling
      • OpenStack, Cloud Stack

Categories

  • IaaS
    • compute, Storage, network
  • PaaS
    • Application Development , Serverless
  • SaaS
    • Email, Docs

Why Cloud is beneficial ?