2. Definition:-
Cloud computing provides the facility to access shared resources
and common infrastructure, offering services on demand over the
network to perform operations that meet changing business
needs.
3. In Other Words
Cloud computing is a general term for anything that involves
delivering hosted services over the Internet.
The name cloud computing was inspired by the cloud symbol that's
often used to represent the Internet in flowcharts and
diagrams.
4. Cloud refers to:-
Before we dig further into how does cloud computing work, first
lets understand what the term cloud refers to. The concept of the
cloud has been around for a long time in many different
incarnations in the business world. It mostly means a grid of
computers serving as a service-oriented architecture to deliver
software and data.
5. 6. 7. Other Definitions:-
Cloud computing is an emerging approach to shared infrastructure in
which large pools of systems are linked together to provide IT
services. IBM press release on Blue Cloud
a hosted infrastructure model that delivers abstracted IT resources
over the Internet Thomas Weisel Partners LLC from Into the Clouds:
LeveragingData Centers and the Road to Cloud Computing
Cloud computing describes a systems architecture. Period. This
particular architecture assumes nothing about the physical
location, internal composition or ownership of its component parts.
James Urquhart blog post
8. Defining the Segments:-
SaaS
Software as a Service
Storage as a Service
PaaS Platform as a Service
IaaS Infrastructure as a Service
9. Cloud Computing Architecture
When talking about a cloud computing system, it's helpful to divide
it into two sections: the front end and the back end. They connect
to each other through a network, usually the Internet. The front
end is the side the computer user, or client, sees. The back end is
the "cloud" section of the system.
10. 11. The Front End
The front end includes the client's computer (or computer network)
and the application required to access the cloud computing system.
Not all cloud computing systems have the same user interface.
Services like Web-based e-mail programs leverage existing Web
browsers like Internet Explorer or Firefox And Gmail, Facebook etc
. Other systems have unique applications that provide network
access to clients.
12. The Back End
On the back end of the system are the various computers, servers
and data storage systems that create the "cloud" of computing
services. In theory, a cloud computing system could include
practically any computer program you can imagine, from data
processing to video games. Usually, each application will have its
own dedicated server.
13. In New Age
Cloud computing has been changing how most people use the web and
how they store their files. Its the structure that runs sites like
Facebook, Amazon and Twitter and the core that allows us to take
advantage of services like Google Docs and Gmail. But how does it
work?
14. 15. The key attributes that distinguish cloud computing from
conventional computing are:
Compute and storage functions are abstracted and offered as
services
Services are built on a massively scalable infrastructure
Services are delivered on demand through dynamic, flexibly
configurable resources
Services are easily purchased and billed by consumption
Resources are shared among multiple users (multi-tenancy)
Services are accessible over the Internet or internal network by
any device.
16. Multiple Graphic Descriptions of the Cloud
17. Hosting Industry Ripe for Change
Technology has evolved
People demand more control
Instant gratification
In-house too costly from CapEx and Human Capital
Colocation for those who want to be physically there
Managed is not dynamic enough
Cloud Computing -Enabling Technology to move from Traditional
Hosting to Cloud Hosting
18. The Cloud Pyramid
Build upon a foundation
Layers equate structure
Building blocks: Infrastructure, Platforms, Applications
19. The Cloud Pyramid Inversed
1000s of Cloud Applications currently
Handful of Cloud Platforms
Elite group of Cloud Infrastructure providers
20. Cloud Applications
SaaS resides here
Most common Cloud / Many providers of different services
Examples: SalesForce, Gmail, Yahoo! Mail, Quicken Online
Advantages: Free, Easy, Consumer Adoption
Disadvantages: Limited functionality, no control or access to
underlying technology
21. Cloud Extenders (Wild Card)
Provides extension to Cloud Infrastructure and Platforms with basic
functionality
Examples: Amazon SimpleDB, Amazon SQS, Google BigTable
Advantages: Extends functionality of Compute & Storage Clouds
to integrate with legacy system or other clouds
Disadvantages: Sometimes requires use of specific Platforms or
Infrastructure
22. Cloud Aggregators (Wild Card)
Sits on top of various Cloud Infrastructures for management
Examples: RightScale, Appistry
Advantages: Provides more options for Cloud environments
Disadvantages: Dependent on Cloud Providers
