Deployment models
Referring to the NIST definition of cloud computing (Authors: Peter Mell and Tim Grance, 10.07.09)
“This cloud model promotes availability and is composed of five essential characteristics, three service models and four deployment models”.
Private cloud
The cloud infrastructure is operated solely for an organisation. It may be managed by the organisation or a third party and may exist on premise or off premise.
Community cloud
The cloud infrastructure is shared by several organisations and supports a specific community that has shared concerns (e.g., mission, security requirements, policy and compliance considerations). It may be managed by the organisations or a third party and may exist on premise or off premise.
Public cloud
The cloud infrastructure is made available to the general public or a large industry group and is owned by an organisation selling cloud services.
Hybrid cloud
The cloud infrastructure is a composition of two or more clouds (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).
Note: Cloud software takes full advantage of the cloud paradigm by being service oriented with a focus on statelessness, low coupling, modularity and semantic interoperability.
