PLATFORMS

Contents

Introduction to cloud computing As a service IaaS PaaS SaaS Advantages

1.Introduction to cloud computing

Internet based computing It invovles delivering hosted services like

Haas,IaaS,SaaS over the internet It has three distinct characteristics as

-> Sold on demand

-> Elastic

-> Service is fully managed by the provider

Cloud computing concept

2.As a Service

3.IaaS Stands for Infrastructure as a Service Computer infrastructure access wia the web It provides the underlying hardwares & opertaing

system resources to do anything,so it is reffered as Everything as a Service

Ability tp pay only for what we use,so also referred as Utility computing

Benefits of IaaS Ability to scale Minimum cost Suitable for small business Offers CPU,memory,networking & security

IaaS providers Amazon-Rackspace cloud

Joyent-Facebook applications & social network LinkedIn

GoGrid

Flexiscale

4.PaaS

Platform as a Service

PaaS(cont.) Platform as a Service (PaaS) is a delivery of a

computing platform over the web.

is defined as a set of software and product development tools hosted on the provider's infrastructure.

PaaS(cont.)IDE-a software

development system

ISV-Independent Software Vendors

Benefits of PaaS For Developers focus only on

innovation Easy & quick

development Integration with other

web services Lower risk &

improved Profitability

For Users Minimize operational

costs Access to information

anywhere, anytime Easy collaboration Secured and

customized access

PaaS providers Google app Engine(GAE) Force.com Coghead Aptana Cloud

5.SaaS

Software as a Service

SaaS Is is also a way of delivering application over the

internet-as a service Instead of installing & maintaining software,we

can simply access it via the internet It is sometime called as Web-based software,on

demand software,or hosted software SaaS applicatiion runs on a SaaS provider's server

SaaS Characteristics A way to understand SaaS model is Banking

system,where the privacy of each customer is maintained

Multitenant Architecture-all users share the single infrastructure and code which is centrally maintained

Easy customization Better access

SaaS Benefits For Users Lower costs Fewer personnel Smaller storage

requirements

For vendors Continous stream of

income Avoid piracy Reduce loss

SaaS providers Salesforce.com is the

largest SaaS providers Google applications Web 2.0

Overall Advantages Lower Cost Low risk & more profit Occupied smaller space No need to maintain hardware Both benefits for developers/vendors & users