'''Nimbus''' is an [[open-source]] toolkit that, once installed on a [[Cluster (computing)|cluster]], provides an [[Infrastructureinfrastructure as a Service]] [[cloud computing|cloud]] to its client via [[Web Services Resource Framework|WSRF]]-based or [[Amazon Elastic Compute Cloud|Amazon EC2]] [[Web Services Description Language|WSDL]] [[web service]] [[Application programming interface|APIs]].
*Nimbus Allowssupports the [[Xen]] hypervisor and virtual machine schedulers [[Portable Batch System|PBS]] and [[Sun Grid Engine|SGE]]. It allows deployment of self-configured virtual clusters via contextualization.<ref>Keahey, K., Freeman, T. (2008). "Contextualization: Providing One-Click Virtual Clusters", 2008 Fourth IEEE International Conference on eScience, pp.301-308. doi: [http://doi.ieeecomputersociety.org/10.1109/eScience.2008.82 10.1109/eScience.2008.82]</ref> It is configurable with respect to scheduling, networking leases, and usage accounting.▼
▲* Allows deployment of self-configured virtual clusters via contextualization<ref>Keahey, K., Freeman, T. (2008). "Contextualization: Providing One-Click Virtual Clusters", 2008 Fourth IEEE International Conference on eScience, pp.301-308. doi: [http://doi.ieeecomputersociety.org/10.1109/eScience.2008.82 10.1109/eScience.2008.82]</ref>
* Configurable with respect to scheduling, networking leases, usage accounting, etc.