Cloud computing is getting tons of press these days. Everyone has a different perspective and understanding of the technology, and there are myriad variations on the definition of the cloud- William Fellows and John Barr at the 451 Group define cloud computing as the intersection of grid, virtualization, SaaS, and utility computing models. James Staten of Forrester Research describes it as a pool of abstracted, highly scalable, and managed compute infrastructure capable of hosting end-customer applications and billed by consumption. Let's take it a step further and examine the core principles, or pillars, that uniquely define cloud computing.

1. 5 Pillars of Private Cloud

3. Virtualization
• Virtualization is the first and most important
pillar for cloud computing.
• It is the technology that powers cloud
computing and simplifies the delivery of
service by providing a platform for optimizing
complex IT resources.
• Virtualization provides resources in a scalable
manner and this makes cloud computing more
cost effective.

5. Automation
• Complete automation makes cloud computing
robust, cost effective and an agile computing
environment.
• Automation improves the efficiency,
consistency, repeatability and productivity to
programmatically carry out tasks.
• Simplified management will improve the
operation efficiency with the use of fewer
resources

7. End To End Monitoring
• Cloud monitoring is a service that monitors
infrastructure, applications, databases and
services.
• Monitoring will provide custom metrics to
help ensure workloads are operating at an
optimum level.
• Monitoring services also provide performance
metrics, threshold based alarms and reliable
notifications to users.

9. Self Service
• Self service operations make it possible for
end users and consumers to perform common
operations without requiring any prior
knowledge for information and technology.
Complete and sophisticated automation
enables self service and agile cloud
computing.

11. Security
• Security and resources allocation are two
important issues with public cloud computing.
• Virtualization technology is the focus of many
new potential threats and exploits; it’s
essential to manage these new vulnerabilities
effectively in the private cloud to avoid data
theft and loss.

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Source: https://www.linkedin.com/pulse/five-pillars-private-cloud-sankar-somepalle