The OpenNebula project has just announced the availability of OpenNebula 4.6 Beta (Carina). This release brings many new features and stabilizes features that were introduced in previous versions.
OpenNebula 4.6 introduces important improvements in several areas. The provisioning model has been greatly simplify by supplementing user groups with resource providers. This extended model, the Virtual Data Center, offers an integrated and comprehensive framework for resource allocation and isolation.
Another important new feature has taken place in the OpenNebula core. It has undergone a minor re-design of its internal data model to allow federation of OpenNebula daemons. With OpenNebula Carina your users can access resource providers from multiple data-centers in a federated way.