An Introduction to Cloud Computing

What is the cloud?

• IT as a service

• Cloud allows access to services without user technical knowledge or control of supporting infrastructure

• Best described in terms of what happened to mechanical power over 100 yrs ago

• Now computers are simple devices connected to the larger cloud

• Data processing, storage and software applications that used to run locally are now being supplied by big central computing stations. They're becoming, in essence, computing utilities.

What isCloud Computing?

IaaSInfrastructure as a Service

PaaSPlatform as a Service

STaaSStorage as a Service

SaaSSoftware as a Service

Software delivery model

• Also known as On-demand service.

• No hardware or software to manage.

• Service delivered through a browser.

SaaS

Advantages

• Pay per use• Instant Scalability• Security• Reliability• APIs

SaaS

Examples• CRM• Financial Planning• Human Resources• Yahoo mail

Commercial Services:• Salesforce.com• emailcloud

SaaS

Platform delivery model

• Category of cloud computing service that provides a platform and a solution stack as a service.

• Estimating demand is not a science!

• Platform management is not fun!

PaaS

Popular services

• Storage• Database• Scalability

PaaS

Advantages

• Pay per use• Instant Scalability• Security• Reliability• APIs

PaaS

Examples

• Google App Engine• Mosso• AWS: S3

PaaS

Computer infrastructure delivery model

Access to infrastructure stack:– Full OS access– Firewalls– Routers– Load balancing

IaaS

Advantages

• Pay per use• Instant Scalability• Security• Reliability• APIs

IaaS

Examples

• Flexi scale• AWS: EC2

IaaS

Common Factors

• Pay per use• Instant Scalability• Security• Reliability• APIs

IaaS

PaaS

SaaS

MODES OF CLOUDS

1. Public Cloud: Can be accessed by any subscriber

with an internet connection and access to the cloud space.

Can be shared by various organizations.

E.g. : Amazon, Google, etc….

2. Private cloud: Is established for a specific group or an

organizations and limits access to just that group.

It is not shared with other organizations.

It is more expensive and more secure. E.g.: HP data centre, IBM, 3tera.

3. Hybrid Cloud: It is essentially a combination or usage

of both public and private cloud. Organizations may host critical

applications on private clouds. Where as relatively less security

concerns on public cloud.

CLOUD OPERATING SYSTEM

• Eye OS• Amoeba OS• Glide OS• Start force• my Goya• Corneli OS• Cloudo, Ghost, Zimdesk

Advantages:• Is Eco-Friendly.• Can reduce E-waste.• Helps to accelerate Green IT.• Can reduce Global Warming.• Reduce cost and Increase

storage.• Allows focus on any topic.

IaaS

PaaS

SaaS

DISADVANTAGE:• Requires a constant internet connection.• Security and Privacy.• A dead internet connection means no

work and in areas where internet connections are few or inherently unreliable, this cloud be a deal-breaker.

• When you are offline, cloud computing simply does not work.

CONCLUSION

• It is a powerful new abstraction for large scale data processing system.

• Also it is a new emerging architecture needed to expand the internet to become the computing platform of the future.