With Eucalyptus you can build, deploy, and manage a hybrid cloud infrastructure on your own servers and on AWS, and shift workloads seamlessly between your private cloud and Amazon for on-demand "cloud bursting." This year's Version 4.0 release brought smoother integration into both enterprise networks and AWS, among other improvements. Eucalyptus also finally scrapped the old admin interface in favor of a nice heads-up dashboard.
New separation and registration of user-facing services from the Eucalyptus cloud controller database brings improved scalability when reaching into the Amazon cloud. Multiple hosts can now run these front-end components concurrently, in an active/active configuration, to eliminate bottlenecks for Amazon services such as IAM and EC2.
The addition of AWS CloudFormation support brings a consistent, template-driven approach to deployment. And the new Edge Networking Mode lets you ditch the cluster controller for a stand-alone node controller, allowing Eucalyptus to fit more seamlessly into an existing network infrastructure. A new S3 object storage gateway brings support of distributed object stores such as Ceph, Swift, and RiakCS, along with S3 itself.
-- James R. Borck