cloudcomputing 120530061248-phpapp02

Cloud Computing

Academic Year : 2011 - 2012

Presented by :Hamza BEN TAHER

Fakhreddine KHEZAMI

Jihed KAOUECH

Supervisor :Arafat BOUSSAID

Services and Network Administration

3 M Info1

Cloud Computing infrastructure models

Service Models

Contents

History

Advantages and disadvantage of cloud computing

Conclusion

What is Cloud Computing ?

Introduction

Cloud Computing

Service Models

Contents

History

Conclusion

Introduction

Cloud Computing

Introduction

Cloud Computing

Computer costs (human and financial) account a large value of the budget of a company.

In response to this problem appeared to Cloud Computing.

Today Cloud Computing has many advantages and appears to be an attractive solution.

Service Models

Contents

History

Conclusion

Introduction

Cloud Computing

6Cloud Computing

What is cloud computing ?

Its purpose is to push companies to externalize the digital resources virtual which they store.

Cloud Computing refers to the many different types of services and applications being delivered in the internet cloud, and the fact that, in many cases, the devices used to access these services and applications do not require any special applications.

The cloud is simply a metaphor for the internet, based on the symbol used to represent the worldwide network in computer network diagrams.

Contents

History

Conclusion

Introduction

Cloud Computing

History

Service Models

Historic

Cloud Computing

The concept was born from the ideas of pioneers like Joseph Carl Robnett Licklider and John McCarthy.

Some of the first uses included the processing of financial transactions and census data.

Historic

Cloud Computing

- The term “cloud computing” was first used by information systems professor Ramnath Chellappa

Historic

Cloud Computing

1960 1971 …

- Companies began switching from hardware to cloud services because they were attracted to benefits like a reduction in capital costs as well as an easing in IT staffing issues.

History

Cloud Computing

1999 2002 2006 2009

• Arrival of Salesforce.com

• Pioneered the concept of delivering enterprise applications via a simple

website.

• The services firm paved the way for both specialist and mainstream

software firms to deliver applications over the internet.

History

Cloud Computing

1999 2002 2006 2009

website.

1999 2002 2006 2009

• Amazon Web Services

• Provide a suite of cloud-based services including storage, computation and

even human intelligence through the Amazon Mechanical Turk

History

Cloud Computing

1999 2002 2006 2009

website.

1999 2002 2006 2009

• Amazon launched its Elastic Compute cloud (EC2) as a commercial web

service

• Allows small companies and individuals to rent computers on which to run

their own computer applications.

History

Cloud Computing

1999 2002 2006 2009

website.

1999 2002 2006 2009

• Amazon launched its Elastic Compute cloud (EC2) as a commercial web

service

• Allows small companies and individuals to rent computers on which to run

their own computer applications.

1999 2002 2006 2009

• Web 2.0 , Google , …

• Browser-based enterprise applications.

• Services (Google Apps)

Contents

History

Conclusion

Introduction

Cloud Computing

Service Models

Cloud Computinginfrastructure models

Cloud Computing

IT organizations can choose to deploy applications on public, private, or hybrid

clouds, each of which has its trade-offs. The terms public, private, and hybrid do

not dictate location. While public clouds are typically “out there” on the Internet

and private clouds are typically located on premises.

Cloud Computing

Public clouds

A public cloud provides services to multiple customers, and is typically deployed at a collocation facility.

Public clouds are most often hosted away from customer premises, and they provide a way to reduce customer risk and cost by providing a flexible, even temporary extension to enterprise infrastructure.

18Cloud Computing

Private clouds

Private clouds may be hosted at a collocation facility or in an enterprise datacenter.They may be supported by the company, by a cloud provider, or by a third party such as an outsourcing firm.

This model gives companies a high level of control over the use of cloud resources while bringing in the expertise needed to establish and operate the environment.

19Cloud Computing

Hybrid clouds

Hybrid clouds combine both public and private cloud models, and they can be particularly effective when both types of cloud are located in the same facility.

Hybrid clouds introduce the complexity of determining how to distribute applications across both a public and private cloud. Among the issues that need to be considered is the relationship between data and processing resources. If the data is small, or the application is stateless, a hybrid cloud can be much more successful than if large amounts of data must be transferred into a public cloud for a small amount of processing.

Contents

History

Conclusion

Introduction

Cloud Computing

Service ModelsService Models

Service Models

Cloud Computing

Infrastructure

Cloud infrastructure services, also known as "infrastructure as a service" (IaaS), deliver computer infrastructure – typically a platform virtualization environment – as a service

Service Models

Cloud Computing

Infrastructure

Platform

Cloud platform services, also known as platform as a service (PaaS), deliver a computing platform and/or solution stack as a service

Service Models

Cloud Computing

Infrastructure

Platform

Application

Cloud application services or "Software as a Service (SaaS)" deliver software as a service over the Internet

Service Models

Cloud Computing

Software As A Service Software as a Service (SaaS) is a software distribution model in which

applications are hosted by a vendor or service provider and made available to customers over a network, typically the Internet.

the SaaS vendor owns the software and runs it on computers in its data center. The customer does not own the software but rents it.

Service Models

Cloud Computing

ADVANTAGES

DISADVANTAGES

Automatic updates and patch management.

Compatibility: All users will have the same version of software.

Easier collaboration.

Eliminate the need to install and run the application on the customer's

own computers.

Software As A Service

No direct control of the data.

Internet connection required.

Security awareness.

Service Models

Cloud Computing

EXAMPLES

Software As A Service

Google Apps salesforce.com

Service Models

Cloud Computing

Platform As A Service

Platform as a Service (PaaS) is a way to rent hardware, operating systems,

storage and network capacity over the Internet. The service delivery model

allows the customer to rent virtualized servers and associated services for

running existing applications or developing and testing new ones without the

cost and complexity of buying and managing the underlying

software/hardware.

Platform as a Service (PaaS) is an outgrowth of Software as a Service (SaaS), a

software distribution model in which hosted software applications are made

available to customers over the Internet. PaaS has several advantages for

developers. With PaaS, operating system features can be changed and

upgraded frequently. Geographically distributed development teams can work

together on software development projects.

Service Models

Cloud Computing

Services can be obtained from diverse sources that cross international

boundaries. Initial and ongoing costs can be reduced by the use of

infrastructure services from a single vendor rather than maintaining multiple

hardware facilities that often perform duplicate functions or suffer from

incompatibility problems. Overall expenses can also be minimized by

unification of programming development efforts.

Service Models

Cloud Computing

Service Models

Cloud Computing

ADVANTAGES

DISADVANTAGES

Maintenance paid by the provider (no update to think).

Access to the platform through a Web browser.

Greatly reduced development time (using modules ...).

Developing real time (as and when enabling modules).

The application does not belong to the client company.

Relative availability (Difficult to predict the sudden load increases).

Service Models

Cloud Computing

EXAMPLES Google App Engine Heroku Mosso Engine Yard Joyent or Force.com (Sales Force Dev Platform)

Service Models

Cloud Computing

Infrastructure As A Service

It's a platform virtualization environment as a service. It permits to provide

treatment, storage, network sand other basic resources, offering customers the

possibility to deploy and run software of their choice.

Characteristics and components of IaaS include :

Utility computing service and billing model.

Automation of administrative tasks.

Dynamic scaling.

Desktop virtualization.

Policy-based services.

Internet connectivity.

Service Models

Cloud Computing

An abstraction of an execution environment that can be made dynamically available to authorized clients by using well-defined protocols.

Resource quota (e.g. CPU, memory share). Software configuration (e.g. O/S, provided services).

VIRTUALIZATIONVirtual workspace

An abstraction of an execution environment that can be made dynamically available to authorized clients by using well-defined protocols.

Abstraction of a physical host machine, Hypervisor intercepts and emulates instructions from VMs, and allows

management of VMs, VMWare, Xen, etc.

Implement on Virtual Machine (VMs)

Plug-ins to hardware/support structures.Provide infrastructure API

Hardware

App App App

Hypervisor

Virtualized Stack

Service Models

Cloud Computing

Run operating systems where the physical hardware is unavailable,

Easier to create new machines, backup machines, etc.,

Software testing using “clean” installs of operating systems and

software,

Emulate more machines than are physically available,

Timeshare lightly loaded systems on one host,

Debug problems (suspend and resume the problem machine),

Easy migration of virtual machines (shutdown needed or not).

Run legacy systems!

VIRTUALIZATIONAdvantages of virtual machines

Service Models

Cloud Computing

Run operating systems where the physical hardware is unavailable,

Less constraints related to architecture (choice, purchase, maintenance,

scalability,...). Everything is the responsibility of the provider.

Dematerialization: in case of degradation of response time, it is possible to pass

dynamically on a more powerful server.

Opportunity to change providers.

Solution less expensive (more profitable to rent virtual servers) Other gains

generated: air conditioning, electricity ... Possibility to manage large volumes of data

VIRTUALIZATIONAdvantages

Service Models

Cloud Computing

Confidentiality of data.

No More access to data in case of failure of the link.

Resistance to change: adaptation, mutation and loss of some job titles in the company

VIRTUALIZATIONDisadvantages

Service Models

Cloud Computing

Contents

History

Conclusion

Introduction

Cloud Computing

Service Models

39Cloud Computing

Advantages and disadvantages of cloud computing

AdvantagesLOWER COMPUTER COSTS

– You do not need a high-powered and high-priced computer to run cloud

computing's web-based applications.

– Since applications run in the cloud, not on the desktop PC, your desktop PC

does not need the processing power or hard disk space demanded by traditional

desktop software.

– When you are using web-based applications, your PC can be less expensive,

with a smaller hard disk, less memory, more efficient processor...

– In fact, your PC in this scenario does not even need a CD or DVD drive, as no

software programs have to be loaded and no document files need to be saved.

40Cloud Computing

AdvantagesIMPROVED PERFORMANCE

– With few large programs hogging your computer's memory, you will see better

performance from your PC.

– Computers in a cloud computing system boot and run faster because they have

fewer programs and processes loaded into memory…

41Cloud Computing

AdvantagesREDUCED SOFTWARE COSTS

– With few large programs hogging your computer's memory, you will see better

performance from your PC.

– Instead of purchasing expensive software applications, you can get most of

what you need for free-ish!

– That is right - most cloud computing applications today, such as the Google

Docs suite, are totally free.

– That is a lot better than paying $200+ for similar Microsoft Office software -

which alone may be justification for switching to cloud applications.

42Cloud Computing

AdvantagesINSTANT SOFTWARE UPDATES

– Another advantage to cloud computing is that you are no longer faced with

choosing between obsolete software and high upgrade costs.

– When the application is web-based, updates happen automatically - available

the next time you log into the cloud.

– When you access a web-based application, you get the latest version - without

needing to pay for or download an upgrade.

43Cloud Computing

AdvantagesIMPROVED DOCUMENT FORMAT COMPATIBILITY

– You do not have to worry about the documents you create on your machine

being compatible with other users' applications or operating systems.

– Where Word 2007 documents cannot be opened on a computer running Word

2003, all documents can be read!

– There are potentially no format incompatibilities when everyone is sharing

documents and applications in the cloud.

44Cloud Computing

AdvantagesUNLIMITED STORAGE CAPACITY

– Cloud computing offers virtually limitless storage.

– Your computer's current 200 Gbyte hard drive is small compared to the

hundreds of Pbytes available in the cloud.

– Whatever you need to store, you can.

45Cloud Computing

AdvantagesINCREASED DATA RELIABILITY

– Unlike desktop computing, in which if a hard disk crashes and destroy all your

valuable data, a computer crashing in the cloud should not affect the storage of

your data.

– That also means that if your personal computer crashes, all your data is still out

there in the cloud, still accessible.

– In a world where few individual desktop PC users back up their data on a

regular basis, cloud computing is a data-safe computing platform!

46Cloud Computing

AdvantagesUNIVERSAL DOCUMENT ACCESS

– That is not a problem with cloud computing, because you do not take your

documents with you.

– Instead, they stay in the cloud, and you can access them whenever you have a

computer and an Internet connection.

– All your documents are instantly available from wherever you are.

47Cloud Computing

AdvantagesLATEST VERSION AVAILABILITY

– Another document-related advantage of cloud computing is that when you edit

a document at home, that edited version is what you see when you access the

document at work.

– The cloud always hosts the latest version of your documents; as long as you are

connected, you are not in danger of having an outdated version.

48Cloud Computing

AdvantagesEASIER GROUP COLLABORATION

– Sharing documents leads directly to better collaboration.

– Many users do this as it is an important advantages of cloud computing

multiple users can collaborate easily on documents and projects.

– Because the documents are hosted in the cloud, not on individual computers,

all you need is an Internet connection, and you are collaborating.

49Cloud Computing

AdvantagesDEVICE INDEPENDENCE

– You are no longer tethered to a single computer or network.

– Changes to computers, applications and documents follow you through the

cloud.

– Move to a portable device, and your applications and documents are still

available.

50Cloud Computing

DisadvantagesREQUIRES A CONSTANT INTERNET CONNECTION

– Cloud computing is impossible if you cannot connect to the Internet.

– Since you use the Internet to connect to both your applications and documents,

if you do not have an Internet connection you cannot access anything, even

your own documents.

– A dead Internet connection means no work and in areas where Internet

connections are few or inherently unreliable, this could be a deal-breaker.

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

51Cloud Computing

DisadvantagesDOES NOT WORK WELL WITH LOW-SPEED CONNECTIONS

– Similarly, a low-speed Internet connection, such as that found with dial-up

services, makes cloud computing painful at best and often impossible.

– Web-based applications require a lot of bandwidth to download, as do large

documents.

– If you are labouring with a low-speed dial-up connection, it might take

seemingly forever just to change from page to page in a document, let alone to

launch a feature-rich cloud service.

– In other words, cloud computing is not for the broadband-impaired!

52Cloud Computing

DisadvantagesCAN BE SLOW

– Even with a fast connection, web-based applications can sometimes be slower

than accessing a similar software program on your desktop PC.

– Everything about the program, from the interface to the current document, has

to be sent back and forth from your computer to the computers in the cloud.

– If the cloud servers happen to be backed up at that moment, or if the Internet is

having a slow day, you would not get the instantaneous access you might

expect from desktop applications.

53Cloud Computing

DisadvantagesFEATURES MIGHT BE LIMITED

– This situation is bound to change, but today many web-based applications

simply are not as full-featured as their desktop-based applications.

– For example, you can do a lot more with Microsoft PowerPoint than with

Google Presentation's web-based offering.

– The basics are similar, but the cloud application lacks many of PowerPoint's

advanced features.

– If you are a power user, you might not want to leap into cloud computing just

54Cloud Computing

DisadvantagesSTORED DATA MIGHT NOT BE SECURE

– With cloud computing, all your data is stored on the cloud.

– The questions is How secure is the cloud?

– Can unauthorized users gain access to your confidential data?

– Cloud computing companies say that data is secure, but it is too early to be

completely sure of that.

– Only time will tell if your data is secure in the cloud.

55Cloud Computing

DisadvantagesSTORED DATA CAN BE LOST

– Theoretically, data stored in the cloud is safe, replicated across multiple

machines.

– But on the off chance that your data goes missing, you have no physical or

local backup.

– Put simply, relying on the cloud puts you at risk if the cloud lets you down.

Contents

History

Conclusion

Introduction

Cloud Computing

Service Models

Conclusion

Demonstration

Thank you for your attention

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