1. Cloud Architecture Chapter 2

2. SPI Model Cloud Computing Classification Model – SPI - SaaS: (Software as a Service) - PaaS (Platform as a Service) - IaaS (Infrastructure as a Service)

3. Infrastructure services share the physical hardware Platform services application framework Software services share the entire software stack.

4. Amazon Elastic Compute Cloud (EC2) is a classic example of IaaS Google App Engine is generally considered to be a PaaS Salesforce.com is a well known example of SaaS.

9. Cloud Delivery Model Public Cloud Private Cloud Partner Cloud Community Cloud Hybrid or Multi-sourced Delivery

10. Public cloud: It has large set of the following features: - Off-premise - Elastisity - Flexible billing - Virtualization - Service delivery - Universal access - Simplified management - Affordable resources - Multi-tenancy - Service level management

11. Private Cloud: only leverages some of the aspects of cloud computing - hosted on-premise, - scales “only” into the hundreds or perhaps thousands of nodes, - connected primarily to the using organization through private network links. - since all applications and servers are shared within the corporation the notion of multi- tenancy is minimized.

12. Partner Cloud: Large IT providers, such as HP Enterprise Services or IBM Global Services, run data center for operations for large customers - manage services in their own facilities; - or on customer premises; - or on property of a third party

13. Community Cloud: it caters a group of organizations with common set of requirements or objectives. The most prominent examplea are government clouds that are open to federal and municipal agencies.

14. Hybrid or Multi-sourced delivery:

15. Cloud and Open Source Cloud computing can leverage open source in many ways. - Self-supported Linux is by far the most popular opernating system from infrastructure servies - Cloud provider often use Xen and KVM for virtualization - Distributed cloud framwworks, such as Hadoop, are usally open source - Web-based API make the client device less relevant, which can reduce desktop license fees by adopting Linux, Google Chrome or other open-souce client.

16. - Many SaaS solutions leverage open-source software, such as SugarCRM