- Public cloud
Applications,
storage, and other resources are made available to the general public by a
service provider. Public cloud services may be free or offered on a
pay-per-usage model. There are limited service providers like Microsoft, Google
etc. owns all Infrastructures at their Data Center and the access will be
through Internet mode only. No direct connectivity proposed in Public Cloud
Architecture.
- Community cloud
Community cloud
shares infrastructure between several organizations from a specific community
with common concerns (security, compliance, jurisdiction, etc.), whether
managed internally or by a third-party and hosted internally or externally. The
costs are spread over fewer users than a public cloud (but more than a private
cloud), so only some of the cost savings potential of cloud computing are
realized.
- Hybrid cloud
Hybrid cloud is
a composition of two or more clouds (private, community or public) that remain
unique entities but are bound together, offering the benefits of multiple
deployment models.
- Private cloud
Private cloud
is infrastructure operated solely for a single organization, whether managed
internally or by a third-party and hosted internally or externally.
They have
attracted criticism because users "still have to buy, build, and manage
them" and thus do not benefit from less hands-on
management, essentially "[lacking] the economic model that makes
cloud computing such an intriguing concept".
