This document defines key concepts of cloud computing including software as a service, platform as a service, infrastructure as a service, and public, private, and hybrid cloud deployment models. It also discusses benefits of cloud computing such as cost savings, scalability, reliability, and mobile access, as well as challenges around security, lack of standards, and continuous evolution. Finally, it provides an overview of Nova's architecture for building public and private clouds using open source software.

1. By Nadia Metoui and Malek Habibi

2. Main Concepts of Cloud Computing

3. • Cloud computing is a general term for anything that
involves delivering hosted services over the Internet

4. • Shared Infrastructure
• Dynamic Provisioning
• Network Access
• Managed Metering

5. Software as a Service (SaaS)
Platform as a Service (PaaS)
Infrastructure as a Service (IaaS)

6. • Private Cloud
• Community Cloud
• Public Cloud
• Hybrid Cloud

7. Public, Private, and Hybrid Cloud Deployment Example

8. • Cost Savings
• Scalability/Flexibility
• Reliability
• Maintenance
• Mobile Accessible

9. • Security and Privacy
• Lack of Standards
• Continuously Evolving

10. Nova’s Architecture

11. • Cloud computing elaborate by Rackspace Cloud and
NASA
• Open source software to build public and private
clouds
• Collection of cloud technology
• Massively scalable cloud computing software

13. • Swift
Software providing object and blob storage
• Glance
Services for discovering, registering, and
retrieving virtual machine images
• Nova
Software providing virtual servers or virtual
machines upon demand