Lecture 21 Cloud Computing Overview taken from Wikipedia

Lecture 21 Cloud Computing

Overview (taken from Wikipedia (2009))

l Cloud computing is a style of computing in which dynamically scalable and often virtualised resources are provided as a service over the Internet (Wikipedia 2009)

And. . . ? l For ‘Cloud’ we could substitute in some cases internet. – – Infrastructure as a service. Platform as a service. Software as a service. Web 2. 0

Infrastructure as a service l l l The resources such as memory, cpu time, servers etc; delivered as a service. Scaling is dynamic what you need scales up and down depending of the application. Where service item has a fixed price - costs can vary.

Platform as a service. l The whole of a web-delivered applications and services all over internet. – – l l Development Delivery No software necessarily needs to be downloaded. Sometimes called cloudware.

Platform as a service (advantages) l Taken from Wikipedia – – – geographically distributed development teams working together on projects web services from multiple sources can be combined. The cost reductions derived from using built-in infrastructure

Amazon Elastic Compute Cloud l l l EC 2 Allows customers to rent computers to run their own applications. EC 2 providing a web interface through which a customer can create virtual machines, – l A server instances, where customer can load any software. paying by the hour for active servers.

Salesforce (taken form Wikipedia) l l Salesforce. com's Platform-as-a-Service product is known as the Force. com Platform. The platform allows external developers to create add-on applications that integrate into the main Salesforce application and are hosted on salesforce. com's infrastructure. Saleforce. com provide Customer Relations Management Software.

Google Apps (Google 2008) l l Google App Engine enables developers to build web applications on the same scalable systems that power our own applications. (Google 2008). Pay for what you use. App Engine costs nothing to get started. All applications can use up to 500 MB of storage and enough CPU and bandwidth to service around 5 million page views a month, absolutely free. pay for resources you use above the free levels.

What is the ‘Killer Application’

References l l Google (2008) appengine. google. com Wikipedia (2009) http: //en. wikipedia. org/wiki/Cloud_computing