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The Three Ways to Cloud Computing
Software applications data storage and processing capacity
are accessed over the Internet.
the three ways to cloud computing, the three building blocks of
cloud computing is software-as-a-service or SAS platforms a service or pass
and infrastructure as a service or is all of these allow users to run
applications and store data online, however, each offers a different level of
user flexibility and control.
1. Software-as-a-service(SAAS)
2. Pass and infrastructure as a service(PAAS)
3. Location as a Service(LAAS)
Basic terms SAS allows users to run existing online
applications Pass allows users to create their own cloud applications using
supplier-specific tools and languages and IOS allows users to run any
applications they please on cloud Hardware of their own choice.
now still be as clear as stagnant pond water so let's work
through it again in more detail.
software as a service or SAS is the easiest way to cloud
compute and is where off-the-shelf applications are accessed over the internet.
So, for example, Google, Microsoft, and Zoho each offer an
online word processor spreadsheet and presentation package.
there are also some
great creative SAS tools including Pixlr, Jacob and Avery as well as dedicated
business applications from employees NetSuite and Salesforce.
the advantage of SAAS is that all applications are free or charged on a subscription basis such. Applications
are also accessible from any computer on the internet and are excellent for
collaborative working.
In business, there are many situations where a generic application will not suffice you platform-as-a-service or pass provides an
environment and a set of tools that allow users to create their own new online
applications, for example, Google has a product called App Engine that enables
anybody to develop run and maintain their own web applications on Google's
infrastructure. Microsoft also has a pass offering called azure that allows users
to develop and run Windows applications in Microsoft's region of the cloud.
salesforce is also a big player in the past landscape with an offering called
force.com both to google app engine and force comm also currently allow one
application to be built and hosted for free.
Offerings allow users to create new online applications very
rapidly at a low cost.
such applications may also be used privately within just one
business or made available publicly. this said adopting pass is restrictive
technically as it limits developers to the programming languages and other
tools but their pass provider have on offer.
there is also the
risk of vendor locking as applications built on one provider's platform cannot
be moved to another .infrastructure as a service OIS allows a business to run
whatever applications it requires on a suppliers cloud hardware this means that
existing applications can be migrated from a company data center in order to
reduce IT costs.
the fundamental unit
of cloud infrastructure is the server today servers can also be physical or
virtual
physical servers are discrete individual computers, in contrast, so-termed virtual server instances are software controlled slices of
real physical servers but are shared amongst many users via a process called
virtualization.
depending on the
types of servers involved I ask comes in four categories. firstly there is the most secure and costly option of the private cloud.
which is where a specific number of physical servers are
dedicated to one customer. secondly, we have dedicated hosting where a customer
rents physical servers on-demand with the cost a number of servers always
matching their requirements.
thirdly there is hybrid hosting were a mix of
physical servers and virtual server instances are rented on-demand in an effort
to reduce costs and further increase flexibility.
finally, we have a cloud hosting
where a customer rents virtual server instances on-demand and often on an
hourly basis.
several companies are now operating in the IOS marketplace, for
example, Amazon offers a number of cloud hosting products that enable a variety
of virtual server instances to be purchased by the hour, these can be launched
in minutes using an Amazon machine image or am configured either to the customer
specification or containing software from Oracle-Sun, IBM or other suppliers.
turn active ios providers include Rackspace who offer all hosting categories
from private clouds to cloud hosting.
and go grid who offer cloud hosting hybrid
hosting and dedicated hosting solutions.
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