Page 23 - Cloud Computing (Elective – III)

Introduction to IaaS

Introduced in the year 2012 by Oracle, IaaS is a cloud computing platform based
model, known as Infrastructure as a service. Formerly IaaS was termed as
Hardware as a Service (HaaS). Cloud computing has three distinct layers such as
PaaS, SaaS, out of which IaaS is one. Here the customer organization outsources
its IT Infrastructures, where customers access resources such as (server, storage,
virtual machines) over the internet. Those resources are accessible in the cloud
computing platform based on pay per use model. Here the clients are billed only
for the services used, further, it helps to reduce cost and complexity of investing
and managing a physical server

What is IaaS ?

o IaaS defined as “Infrastructure as a service”, provides visualized
computing features to the clients through the internet. Also known as
hardware as a service, it provides resources that belong to virtualized
hardware termed as computing infrastructure that offers virtual servers
storage, networking connections and IP address.

o IaaS cloud computing is distinguished into three models namely public,
private and hybrid cloud. Public cloud states its location in a cloud
computing platform, whereas in the case of private cloud the infrastructure
is stored in customer place. In Conclusion, the hybrid cloud is the
combination of both models where the customer chooses the best
alternative.

o In detail, Public clouds are a common method of deploying cloud
computing. Microsoft Azure is an example of a public cloud where cloud
utilities like storage and servers are operated by third-party buyers and
delivered over the web.

o The third-party buyers are the cloud service providers who own the
hardware, software and several infrastructures. Public cloud costs the users
less as no physical hardware or software needs to be purchased, the user
has only to pay for the service he owns. Moreover, it provides high
reliability and scalability with negligible maintenance.

o Private Cloud as its name says it comprises of resources to be used by one
organization only. The private cloud can be installed physically at
organization premises or else can be hosted by third-party cloud service
providers. Private clouds are mostly used by government agencies,
institutions, etc. This model provides more flexibility, greater security, and
high scalability.