2.1 Cloud Computing :
Cloud computing is offered in
different forms: public clouds, private clouds, and hybrid clouds, which
combine both public and private. (You can get a sense of the differences among
these kinds of clouds).
• Cloud Software as a Service
(SaaS)
The
capability provided to the consumer is to use the provider’s applications
running on a cloud infrastructure. The applications are accessible from various
client devices through a thin client interface such as a web browser (e.g.,
web-based email). The consumer does not manage or control the underlying cloud
infrastructure including network, servers, operating systems, storage, or even
individual application capabilities, with the possible exception of limited
user-specific application configuration settings.
• Cloud Platform as a Service
(PaaS).
Platform-as-a-service in the
cloud is defined as a set of software and product development tools hosted on
the provider's infrastructure. Developers create applications on the provider's
platform over the Internet. PaaS providers may use APIs, website portal
software installed on the customer's computer. Force.com, (an outgrowth of
Salesforce.com) and GoogleApps are examples of PaaS. Developers need to know
that currently, there are not standards for interoperability or data
portability in the cloud. Some providers will not allow software created by
their customers to be moved off the provider's platform.
• Cloud Infrastructure as a
Service (IaaS).
Amazon Web Services provides
virtual server instance API) to start, stop, access and configure their virtual
servers and storage. In the enterprise, cloud computing allows a company to pay
for only as much capacity as is needed, and bring more online as soon as required.
Because this pay-for-what-you-use model resembles the way electricity, fuel and
water are consumed, it's sometimes referred to as utility computing.
2.1.1 Benefits of Cloud Computing:
·
Reduction
in upfront capital expenditure on hardware and software deployment. Consumption
is usually billed on a utility (like phone bills) or subscription (like
magazines) model.
·
Location
independence, so long as there is access to the Internet
·
Increased
flexibility and market agility as the quick deployment model of cloud computing
increases the ability to re-provision rapidly as required
·
Allows
the enterprise to focus on its core business
·
Increased
competitive advantage
·
Increased
security at a much lesser cost as compared to traditional standalone
applications due to centralization of data and increased security-focused
resources
·
Easy
to maintain as they don't have to be installed on each user's computer
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