3 Definition “Cloud” is a metaphor for the Internet. Cloud computing is new location-independent computing model, in which shared servers and data storage devices provide resources, software, and data to users in an on-demand manner, just like the electricity grid. Cloud computing -> Network is computer
5 Architecture Client (end user): web browser or an APP Service: functions in cloud computing Application: backbone of service Platform: software infrastructure for applications, e.g., Windows Azure, Google App Engine, VMware Foundry, Heroku. Storage: disks, tapes, optical, memory, etc Infrastructure: IT hardware and facilities
6 Why Cloud Computing The milk/cow example The power/power plant example The restaurant example From business point of view, most of time it is better to rent than buy.
7 Why Cloud Computing No capital expenses needed Customers only pay a fee for what are used Flexible capacity and feature sets No risk of obsolescence No facilities and engineering cost incurred Guaranteed business continuity and disaster recovery
8 Services Software as a Service (SaaS) Infrastructure as a Service (IaaS) Platform as a Service (PaaS)
9 SaaS A software distribution model in which applications are hosted by vendor or service provider and made available to users over Internet. Network-based management and access to commercially available software from central locations rather than at each user’s site. Application delivery follows a one-to-many model as opposed to a traditional one-to-one model. Centralized administration Examples: Gmail/Hotmail, Google Docs, TurboTax, iCube online OS, etc
10 SaaS Benefits: No powerful computer needed. No installation needed. Automated update and patch management services. Data compatibility across the enterprise (All users have the same version of software). Facilitated, enterprise-wide collaboration. Global accessibility.
11 IaaS The delivery of computer infrastructure (servers, storage, networking components) as a service. The IaaS provider owns the equipment and is responsible for housing, running and maintaining it. The client typically pays on a per-use basis. Examples: Amazon EC2, Joyent, GoGrid, Dropbox
12 IaaS Benefits: Ready access to a preconfigured environment Use of latest technology for equipment Secured “sand-box” computing platform Ability to manage service peaks and valleys No capital investments needed Reduced time, cost and complexity in adding new features and capacities
13 PaaS Delivery of computing platform and solution stack as a service. Mainly used by developers to build and deploy their applications. Examples: Windows Azure, Google App Engine, VMware Foundry, Heroku.
14 PaaS Benefits: Fast and cost-effective application development and delivery. Deliver new applications to markets via web browsers. Users pay only for what they use.
Built for the exclusive use of one client, providing the utmost control over data, security, and Quality of Service (QoS). Built and managed by a company’s own IT professionals or by a cloud provider. Private Cloud
A cloud vendor makes all the resources like applications and storage available to general public over the Internet. Run by third party. Hosted away from customer premises. Public Cloud
Combines both public and private cloud. Ability to augment a private cloud with the resources of a public cloud. Hybrid Cloud