Cloud Computing

Cloud Computing

Eduardo Correia (Christchurch Polytechnic Institute of Technology (CPIT), New Zealand)
DOI: 10.4018/978-1-5225-7598-6.ch009
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Cloud computing makes use of many standard technologies in surprisingly novel ways. It leaves many people bewildered, even confused, especially as it is an area of computing that is undergoing rapid change in terms of a diversification of available services and the growth in underlying contingent technologies. This chapter shows how the cloud has changed the user experience and goes on to discuss the definition of cloud computing most commonly used. It describes the three service models of infrastructure as a service (IaaS), platform as a service (PaaS), and software as a service (SaaS) and then discusses the four deployment models of private cloud, public cloud, hybrid cloud, and community cloud. It concludes with how the cloud impacts security and how most organizations will likely make use of multiple cloud providers. This chapter introduces key concepts and characteristics of cloud computing, in this way covering in broad terms what it is and how it essentially works.
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Service Models

Cloud providers, through the use of virtualization, essentially abstract the software, whether it be a server, a database or a network from the underlying physical infrastructure, and offer customers logical software-defined computing resources and services that they can customize, secure, provision and manage in a way that meets their needs and requirements (Buyya, Vecchiola, & Thamarai Selvi, 2013). The service models in cloud computing all reflect this principle of abstraction and represent different sets of responsibility depending how much or how little customers wish to outsource. Infrastructure as a Service (IaaS), Platform as a Service (PaaS) and Software as a Service (SaaS) therefore represent progressively lower levels of engagement on the part of customers, as they cede more of their responsibilities to the cloud provider.

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