I’m going to examine the three ways to cloud compute the three building blocks of cloud computing are software-as-a-service or SaaS platforms a service or PaaS and IaaS.
Three ways of Cloud Computing. All of these allow users to run applications and store data online. However each offers a different level of user flexibility and control in basic terms SaaS allows users to run existing online applications PaaS allows users to create their own cloud applications using supplier specific tools and languages and eius allows users to run any applications they on cloud Hardware of their own choice okay that might right now. Still be as clear as stagnant pond water so let’s work through it again in more detail software as a service.
SaaS Service Explained-
SaaS 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 SaaS tools including Pixlr Jacob and Avery as well as dedicated business applications from employees NetSuite and Salesforce.
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.
PaaS Service Explained-
PaaS provides an environment and a set of tools that allow users to create their own new online applications for example Google have 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 PaaS 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 on the past landscape with an offering called force comm both 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 low cost such applications may also be used privately within just one business or made available publicly this said adopting PaaS is restrictive technically as it limits developers to the programming languages. Other tools but their PaaS provider has on offer there is also the risk of vendor locking.
IaaS Service Explained-
applications built on one providers platform cannot be moved to another IaaS or is 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.
A virtual server instances are software controlled slices of real physical servers but is 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 where a mix of physical servers and virtual server instances are rented on-demand in an effort to reduce cost and further increase flexibility finally we have cloud hosting where a customer rents virtual server instances on-demand and often on an hourly basis several companies are now operating in the eius 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 i configured either to customer specification or containing software from Oracle Sun IBM or other suppliers turn ative.
I asked 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 anybody wanting to understand cloud computing has to get to grips with its fundamental building blocks of software as a service platform as a service and infrastructure as a service more information can be found on explaining computers comm forward stash cloud or in my book a brief guide to cloud computing.
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