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EUCALYPTUS: Elastic Utility Computing Architecture for Linking Your Programs To 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'sEC2.Because EUCALYPTUS is designed to function as an overlay, it must beable to incorporate resources from different clusters or pools. Forexample, EUCALYPTUS allows its administrator to set up a "cloud" thatpermit users to virtualized OS instances on a number of clusterstransparently. Enabling the necessary network interconnectivity in away that is secure and portable is one novel feature of EUCALYPTUS.Another stems from its ability to provide interface compatibility withthe existing Amazon EC2 service. EUCALYPTUS users can develop usingtheir own local resources and then transition directly some or all oftheir functionality to EC2.Finally, a key requirement of EUCALYPTUS is that it be able to serveas a research platform for elastic computing. To this end, its designmakes two significant contributions. The first concerns the use ofscarce network resources in a structured way. A EUCALYPTUS allocationcan function equally well in an environment in which all processorshave externally routable IP addresses (e.g. Amazon's currentenvironment) as well as one in which only a certain "front-endmachine" is externally routable (as is the case with many productionand research clusters today). Secondly, EUCALYPTUS leverages theextensive Linux packaging and deployment support that is currentlyavailable while requiring minimal modification to the existinginstalled OS base. Specifically, the target resources need only run astandard hypervisor (Xen, KVM), along with common open-source Linuxutilities. All other functionality installs directly without need forkernel patching or module additions to the host OS domain.For more information and complete documentation, please visit ourwebsite (http://open.eucalyptus.com).