"Cloud Computing", by definition, refers to the on-demand delivery of IT resources and applications via the Internet with pay-as-you-go pricing.

7. What is Cloud Computing ?
"Cloud Computing", by definition,
refers to the on-demand
delivery of IT resources and
applications via the Internet with
pay-as-you-go pricing.

8. The BASICS
• Whether you are running applications that share photos to millions of
mobile users or you’re supporting the critical operations of your business,
the “cloud” provides rapid access to flexible and low cost IT resources.
• With cloud computing, you don’t need to make large upfront
investments in hardware and spend a lot of time on the heavy lifting of
managing that hardware.
• Instead, you can provision exactly the right type and size of
computing resources you need to power your newest
bright idea or operate your IT department.
• You can access as many resources as you need, almost
instantly, and only pay for what you use.

9. How Does it Work ?
• Cloud Computing provides a simple way to access
servers, storage, databases and a broad set of
application services over the Internet.
• Cloud Computing providers such as Amazon Web
Services own and maintain the network
connected hardware required for these
application services, while you provision and
use what you need via a web application.

10. : Benefits of Cloud Computing :
Instead of having to invest heavily in data centers
and servers before you know how you’re going to
use them, you can only pay when you consume
computing resources, and only pay for how
much you consume.

11. : Benefits of Cloud Computing :
Eliminate guessing on your infrastructure capacity needs. When
you make a capacity decision prior to deploying an application,
you often either end up sitting on expensive idle resources or
dealing with limited capacity.
With Cloud Computing, these problems go away. You can
access as much or as little as you need, and scale up
and down as required with only a few minutes notice.

12. : Benefits of Cloud Computing :
In a cloud computing environment, new IT resources are
only ever a click away, which means you reduce the
time it takes to make those resources available to your
developers from weeks to just minutes. This results in a
dramatic increase in agility for the organization, since
the cost and time it takes to experiment and
develop is significantly lower.

13. : Benefits of Cloud Computing :
Focus on projects that differentiate your
business, not the infrastructure. Cloud
computing lets you focus on your own
customers, rather than on the heavy
lifting of racking, stacking and
powering servers.

14. : Benefits of Cloud Computing :
Easily deploy your application in multiple regions
around the world with just a few clicks.
This means you can provide a lower latency and
better experience for your customers simply
and at minimal cost.

15. It’s Requirement
Application(E
.g. Microsoft
Office Word)
Operating
System
Hardware
Crashes!!
Crashes!!
Cannot use it.
Unsaved data
lost!!
Application sits on a
cloud( e.g. Google
drive, Dropbox etc.)
Operating
System
Hardware
Earlier Now

16. Layers in Cloud Computing
CLIENT
SERVER
Applications (SaaS)
Platform (PaaS)
Infrastructure (IaaS)
End User
Businessmen
Developer
Applications
Infrastructure
Platform

17. Infrastructure as a Service (IaaS)
This is the base layer of the cloud stack.
It serves as a foundation for the other two layers, for their execution. The
keyword behind this stack is Virtualization.
Let us try to understand this using Amazon EC2. In Amazon EC2 (Elastic
Compute Cloud) your application will be executed on a virtual
computer (instance). You have the choice of virtual computer,
where you can select a configuration of CPU, memory &
storage that is optimal for your application. The whole cloud
infrastructure viz. servers, routers, hardware based
load-balancing, firewalls, storage & other network equipment
are provided by the IaaS provider. The customer buy these
resources as a service on a need basis.

18. Platform as a Service (PaaS)
Now you don’t need to invest millions of $$$ to get that development foundation
ready for your developers. The PaaS provider will deliver the platform on the web, and
in most of the cases you can consume the platform using your browser, i.e. no need to
download any software. It has definitely empowered small & mid-size companies or
even an individual developer to launch their own SaaS leveraging the power of these
platform providers, without any initial investment.
PaaS Examples :
Google App Engine and Windows Azure are examples of Cloud OS.
OrangesScape & Wolf PaaS are cloud middleware. Windows Azure
is gradually evolving into IaaS+PaaS

19. Software as a Service (SaaS)
This is the Top most layer of the cloud computing stack - directly consumed by end user –
i.e. SaaS (Software as a Service).
On-Premise applications are quite expensive, affordable only to big enterprises. Why?
Cause On-Premise applications had a very high upfront CapEx(Capital Expenditure);
which results in a high TCO (Total Cost of Ownership). On-Premise apps also
require a higher number of skilled developers to maintain the application.
In its current avatar SaaS is going to be the best bet for SMEs/SMBs
(Small & Mid size businesses). Now, they can afford best software solution for
their business without investing anything at all on the infrastructure or
development platform or skilled manpower. The only requirement for SaaS
is a computer with browser, quite basic. SaaS is a recurring subscription
based model delivered to customer on demand – Pay as you use.

20. Deployment Models
• A cloud system (IaaS, PaaS, and SaaS) can be deployed using the following
three main models.
• A public cloud sells services to anyone on the Internet. (e.g. currently
Amazon Web Services is the largest public cloud provider.)
• A private cloud is a proprietary network or a data centre that supplies
hosted services to a limited number of people.
• When a service provider uses public cloud resources to create their private
cloud, the result is called a virtual private cloud. Private or public, the goal
of cloud computing is to provide easy, scalable access to computing
resources and IT services.
• A hybrid cloud is needed when private clouds run out of capacity. It is a
composition of two or more clouds that remain unique entities but are
bound together.

21. Thanks ! Enjoy !
Questions ? ANKUR MISHRA
www.ankurmishra.in
ankur@foreantech.com
Twitter: @iAnkurMishra
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