It is a UI built on top of Webmin for managing virtual systems, such as Xen, KVM and OpenVZ instances. Using Cloudmin you can create, destroy, resize, startup, shutdown and restrict multiple instances using different virtualization technologies from a single interface. It also has a full command line API that can be used to manage virtual systems from a shell script or via HTTP requests. Cloudmin is designed for use by VPS hosting companies that sell virtual systems to their customers, but is also suited for anyone who wants to get into virtualization for application management, testing, controlling a cluster of Virtualmin hosts, or just to learn about cloud computing. Cloudmin supports additional logins called system owners, who can be given limited access to a subset of virtual systems, and can be restricted in the actions that they perform. Owners can have limits set on their disk, RAM and CPU usage that apply across all their virtual systems, either defined on a per-owner limit or from a plan.