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About Eucalyptus Enterprise Cloud
EUCALYPTUS is an open source service overlay that implements elastic computing using existing resources. The goal of EUCALYPTUS is to allow sites with existing clusters and server infrastructure to co-host an elastic computing service that is interface-compatible with Amazon's EC2.
On-premise Enterprise Cloud Infrastructure as a Service
Eucalyptus is the world's most widely deployed software platform for on-premise (private) Infrastructure as a Service (IaaS) clouds. It uses existing infrastructure to create a scalable, secure web services layer that abstracts compute, network and storage to offer IaaS. Eucalyptus takes advantage of modern infrastructure virtualization software to create elastic pools that can be dynamically scaled up or down depending on application workloads. Eucalyptus web services are uniquely designed for hybrid clouds using the industry standard Amazon Web Services™ (AWS) API. The benefits are highly efficient scalability, increased trust and control for IT as a Service.
Because EUCALYPTUS is designed to function as an overlay, it must be able to incorporate resources from different clusters or pools. For example, EUCALYPTUS allows its administrator to set up a "cloud" that permit users to virtualized OS instances on a number of clusters transparently. Enabling the necessary network interconnectivity in a way that is secure and portable is one novel feature of EUCALYPTUS. Another stems from its ability to provide interface compatibility with the existing Amazon EC2 service.
EUCALYPTUS users can develop using their own local resources and then transition directly some or all of their functionality to EC2. Finally, a key requirement of EUCALYPTUS is that it be able to serve as a research platform for elastic computing. To this end, its design makes two significant contributions. The first concerns the use of scarce network resources in a structured way. A EUCALYPTUS allocation can function equally well in an environment in which all processors have externally routable IP addresses (e.g. Amazon's current environment) as well as one in which only a certain "front-end machine" is externally routable (as is the case with many production and research clusters today). Secondly, EUCALYPTUS leverages the extensive Linux packaging and deployment support that is currently available while requiring minimal modification to the existing installed OS base. Specifically, the target resources need only run a standard hypervisor (Xen, KVM), along with common open-source Linux utilities.
Source: Eucalyptus REAMDE form Eucalyptus 3.1 source on GitHub.