Session Presented @IndicThreads Cloud Computing Conference, Pune, India ( http://u10.indicthreads.com ) ------------ EUCALYPTUS – Elastic Utility Computing Architecture Linking Your Programs To Useful System – is an open source software infrastructure for implementing on-premise clouds. Eucalyptus is a Linux based software layer that can be used to form private clouds in IT enterprise. Eucalyptus provides cloud interoperability and ability of creating hybrid clouds because of seamless integration with Amazon’s public cloud services including EC2 and S3. Since it supports AWS, same application can be run on Amazon’s cloud and Eucalyptus without modification. This case study focuses on basic architecture and capabilities of eucalyptus – end user customization, self service provisioning, customized SLAs, cloud monitoring and support for auto scaling. It will also look at alternatives in open source area. Takeaways from the session A live demonstration of the capabilities of eucalyptus for creating private cloud. We will also show how a private cloud can be extended beyond firewalls to the public cloud. Amazon web services will be used for creation of such hybrid clouds.