Topic: CLOUD COMPUTING

Group Members: Sabeeh Ahmed Syed Mohsin

Semester: 5th

Why Cloud Computing is Called CLOUD COMPUTING

• Name shows something very big.• Globally same services (As clouds)• Virtualization• It's hard to measure a cloud (both)• clouds are opaque and you can't see what

goes on inside them.• Elastic

Traditional Hosting vs Cloud Computing

What is Traditional Hosting

Shared hosting Is usually for small and medium sized business. Client can pay set amount of space on a single

server. server's resources are shared by a number of

other websites

Traditional Hosting

Shared hosting

Dedicated Hosting

Dedicated hosting

a company pays for the complete resources of one or more servers from a service provider.

he client has dedicated bandwidth, CPU, RAM, and drive space.

has full control over the servers resources.

Cloud Computing• It is a service rather than a product.• Can access cloud based applications through

a web browser or a light weight desktop or mobile app

• No need to install software and high configured machinery.

• All you need is INTERNET having good speed.• Service is fully managed by provider.• A simple example of cloud computing is

Yahoo, Gmail , Hotmail etc

Kinds Of Cloud

Public Cloud

• Computing infrastructure is hosted at the vendor’s premises.

• customer has no visibility over the location of the cloud computing infrastructure.

• computing infrastructure is shared between organizations.

Private Cloud

• Computing architecture is dedicated to the customer.

• not shared with other organizations. • They are expensive• secure than Public Clouds.• May hosted externally or internally

Hybrid Cloud

• The combination is known as Hybrid Cloud. • Organizations host some critical, secure

applications in private clouds. • not so critical applications are hosted in the

public cloud.• Combine to form hybrid cloud

Features

Agility. (efficiently adapting to changes) Cost. (claimed to be reduced) Device and location independence. Security. (improve due to centralization of data) Maintenance. (is easier) Reliability. (is improved)

Service Models

IaaS (Infrastructure as a service)• most basic cloud service model.• organization used the equipment to support operations.• The service provider owns the equipments.• Responsible for

Housing Running Maintaining • sometimes referred to as Hardware as a Service (HaaS).

• EC2, Amazon S3, Rackspace Cloud Servers are some of

the leading vendors.

SaaS (Software as a service)

• Providers install and operate the software in cloud• Can access through cloud clients.• Global accessibility • No hectic install application on your PC.• What makes a cloud application different from other

applications is its elasticity. • i.e. cloning tasks onto multiple virtual machines.• Gmail and Hotmail are prime examples of SaaS.

PaaS (Platform as a service)• providers deliver computing platform.• including operating system, programming language execution environment database. web server.• No need to buy and manage hardware and software• Google App Engine, Microsoft Azure and Saleforce.com are

some of the leading vendors.

Major Difference between Traditional Hosting and cloud computing

• Cloud Computing is sold on demand• The service is managed by the provider• User can determine the amount of service

they take• Users can log on to the network from any

computer in the world

Risks of Cloud Computing

• take a long time to resolve.• Terms and condition issue• You are dependent on cloud computing

provider.• Data migration issues when changing cloud

provider • What happens if your cloud provider goes out

of business?

Summary + Quick look

Cloud Failures

• Amazon's failures: (April 22, 2011) Quora.com, Reddit.com, GroupMe.com and

Scvngr.com unable to access.

• Microsoft online services hit by major failure: (September 9, 2011) Hotmail, Office 365 and Skydrive