The ever-expanding OpenStack ecosystem now has an enterprise-ready PaaS. Stackato, built on Cloud Foundry and hardened for the enterprise, now supports vSphere, Amazon/AMI, HP Cloud Services, OpenStack, Citrix XenServer, and KVM infrastructure models.
EC2 is already a (para)virtualized environment, which means it’s nearly impossible to run your own virtualization (KVM/VirtualBox/qemu) from inside that environment. However, Linux recently introduced a new system into the kernel, called cgroups, which provides a way to isolate process groups from each other in the kernel.
