What is Cloud Computing
A guide to what is cloud computing and the different types, we explain cloud systems and include information on deployment and cloud services available. Cloud computing establishes access to carrier-class data centre technology with better performance, higher efficiency, and lower costs. The term ‘cloud’ came from the common use of the cloud symbol for the Internet that, in turn, was derived from the use of cloud symbols commonly used in telecommunication diagrams before the Internet.A Google slide at the end of the post covers the essential characteristics, service models, and deployment models.
The NIST Definition of Cloud Computing lists five essential characteristics of Cloud Computing. If missing any one of these essential characteristics means a service or computing capability cannot be considered as Cloud Computing.
On-demand self-service.
Broad network access.
Resource pooling.
Rapid elasticity.
Measured service.
You can find further information of these characteristics in our Google slide show.
So, Cloud Computing is measured and usually on the Internet.
Next, the NIST Definition of Cloud Computing list three service models:
We lists five essential characteristics and explain of Cloud Computing. It is reasonable to assume that missing any one of these essential characteristics means a service or computing capability cannot be considered as Cloud Computing.
Software as a Service (SaaS) – In which applications run on a cloud but the user doesn’t provision or modify the cloud service, or even application capabilities, apart from limited user-specific configuration settings.
Platform as a service (PaaS) – In which users can utilise cloud-provided programming tools to deploy applications without controlling most of the underlying infrastructure, with the possible exception of the application hosting environment configuration.
Infrastructure as a service (IaaS) – Consumer has control over the operating systems, storage, deployed applications, and possibly limited control of select networking components (e.g., host firewalls) of the cloud environment available to the user via the network.
These service models need illustrations to make them easier to understand. And you can find such illustrations and further information of these service models in our Google slide show.
Finally, the NIST Defintion of Cloud Computing lists four deployment models:
Private cloud. The cloud infrastructure is provisioned for exclusive use by a single organisation comprising multiple consumers (e.g., business units). It may be owned, managed, and operated by the organisation, a third party, or some combination of them, and it may exist on or off premises. More on Private Clouds.
Community cloud. The cloud infrastructure is provisioned for exclusive use by a specific community of consumers from organisations that have shared concerns (e.g., mission, security requirements, policy, and compliance considerations). It may be owned, managed, and operated by one or more of the organisations in the community, a third party, or some combination of them, and it may exist on or off premises. More on Community Clouds.
Public cloud. The cloud infrastructure is provisioned for open use by the general public. It may be owned, managed, and operated by a business, academic, or government organisation, or some combination of them. It exists on the premises of the cloud provider. More on Public Clouds.
Hybrid cloud. The cloud infrastructure is a composition of two or more distinct cloud infrastructures (private, community, or public) that remain unique entities, but are bound together by standardised or proprietary technology that enables data and application portability (e.g., cloud bursting for load balancing between clouds). More on Hybrid Clouds.
These deployment models need illustrations to make them easier to understand. And you can find such illustrations and further information of the deployment models in our Google slide show.
Find out how Datanova can help you get in the cloud, or view the presentation below to learn more about cloud computing.
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