Cloud and Virtualization

Virtualization is the process of using software to create a virtual version of a physical resource.

Key component: The Hypervisor-is the software that creates and runs Virtual Machines (VMs) e.g. Virtual box, VMWare

A VM is an emulated computer system that runs on top of another physical computer

Benefits:

1. Efficiency
2. Testing and safety

Cloud Computing

This is the on-demand delivery of IT resources (servers, storage, databases, software) over the internet (“the cloud”) with pay-as-you-go pricing.

Cloud computing depends on virtualization

SERVICE MODELS OF CLOUD COMPUTING

This is a “stack”- each level builds on the one below it.

1. IaaS (Infrastructure as a Service): Renting the raw infrastructure-virtual servers (VMs), storage, networking.

It is used by system administrators, network engineers

Examples: AWS EC2, Google Computer Engine

1. PaaS (Platform as a Service): renting the infrastructure plus the tools, operating systems and databases needed to build and deploy applications

It is used by software developers

Examples: Heroku, Google App Engine

1. SaaS (Software as a Service): Renting a finished, ready-to-use software application that runs in your browser

It is used by the end user(you)

Examples: Gmail, Google Docs, Microsoft 365, Netflix.