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EUCALYPTUS: Elastic Utility Computing Architecture for Linking Your Programs to Transiently Useful SystemsEUCALYPTUS is an open source service overlay that implements elasticcomputing using existing resources. The goal of EUCALYPTUS is to allowsites with existing clusters and server infrastructure to co-host anelastic computing service that is interface-compatible with Amazon's EC2.Because EUCALYPTUS is designed to function as an overlay, it must be able toincorporate resources from different clusters or pools. For example,EUCALYPTUS allows its administrator to set up a "cloud" that permit users tovirtualized OS instances on a number of clusters transparently. Enabling thenecessary network interconnectivity in a way that is secure and portable isone novel feature of EUCALYPTUS. Another stems from its ability to provideinterface compatibility with the existing Amazon EC2 service. EUCALYPTUSusers can develop using their own local resources and then transitiondirectly some or all of their functionality to EC2.Finally, a key requirement of EUCALYPTUS is that it be able to serve as aresearch platform for elastic computing. To this end, its design makes twosignificant contributions. The first concerns the use of scarce networkresources in a structured way. A EUCALYPTUS allocation can functionequally well in an environment in which all processors have externallyroutable IP addresses (e.g. Amazon's current environment) as well as one inwhich only a certain "head instance" is externally routable (as is the casewith most academic research clusters today). Secondly, EUCALYPTUSleverages the extensive Linux packaging and deployment support that iscurrently available while requiring minimal modification to the existinginstalled OS base. Specifically, the target resources need only run astandard Xen-enabled kernel with Xen 3.1 or later hypervisor support. Allother functionality installs directly without need for kernel patching ormodule additions to the host OS domain.For more information and complete documentation, please visit ourwebsite (http://open.eucalyptus.com).