Public clouds (or external clouds)

“A large-scale distributed computing paradigm that is driven by economies of scale, in which a pool of abstracted, virtualized, dynamically-scalable, managed computing power, storage, platforms, and services are delivered on demand to external customers over the Internet” (Foster et al.)

Start point: October/November 2007 - IBM Blue Cloud

Public clouds (or external clouds)

• Public clouds (or external clouds)

• resources are dynamically provisioned on a fine-grained, self-service basis over the Internet, via Web applications or Web services.
• the cloud is hosted, operated, and managed by a third-party vendor from one or more data/computing centers
• organizations/customers lease shared resources from public clouds, effectively becoming infrastructure tenants rather than owners
• computing becomes a public utility
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