I continue to talk with clients who understand the concept of private cloud computing, they think they know it when they see it, but they can’t quite explain it in words. A year ago I described The Spectrum of Private to Public Cloud Services, but I didn’t put that in the form of a definition. Here’s a shot.
Gartner’s official definition of cloud computing is “A style of computing where scalable and elastic IT-enabled capabilities are delivered as a service to customers using Internet technologies.” We also describe five defining attributes of cloud computing: service-based, scalable and elastic, shared, metered by use, uses Internet technologies. A key to cloud computing is an opaque boundary between the customer and the provider. Graphically, that looks like this:
When the customer does not see the implementation behind the boundary, and the provider doesn’t care who the customer is, you have a public cloud service. So what is private cloud?
Private cloud is “A form of cloud computing where service access is limited or the customer has some control/ownership of the service implementation.”
Graphically, that means that either the provider tunnels through that opaque boundary and limits service access (e.g., to a specific set of people, enterprise or enterprises), or the customer tunnels through that opaque boundary through ownership or control of the implementation (e.g., specifying implementation details, limiting hardware/software sharing). Note that control/ownership is not the same as setting service levels – these are specific to the implementation, and not even visible through the service.
The ultimate example would be enterprise IT, building a private cloud service used only by its enterprise. But there are many other examples, such as a virtual private cloud (the same as the example above, except replace ‘enterprise IT’ with ‘third-party provider’), and community clouds (the same as a virtual private cloud, except opened up to a specific and limited set of different enterprises).
Still “foggy”, or is it “clear”?
Read Complimentary Relevant Research
Cloud Computing Primer for 2018
Cloud is evolving from a market disruptor to an expected approach for traditional and next-generation IT. Our research offers actionable...
View Relevant Webinars
Key Market Dynamics in Application Infrastructure and Middleware
We discuss the most-significant supply- and demand-side trends affecting current and upcoming dynamics in the application infrastructure...
Comments or opinions expressed on this blog are those of the individual contributors only, and do not necessarily represent the views of Gartner, Inc. or its management. Readers may copy and redistribute blog postings on other blogs, or otherwise for private, non-commercial or journalistic purposes, with attribution to Gartner. This content may not be used for any other purposes in any other formats or media. The content on this blog is provided on an "as-is" basis. Gartner shall not be liable for any damages whatsoever arising out of the content or use of this blog.