This kind of server virtualization is a technique where the kernel of an operating system allows for multiple isolated user-space instances. These instances run on top of an existing host operating system and provide a set of libraries that applications interact with, giving them the illusion that they are running on a machine dedicated to its use. The instances are known as Containers, Virtual Private Servers or Virtual Environments.
Operating system level virtualization is achieved by the host system running a single OS kernel and through its control of guest operating system functionality. Under this shared kernel virtualization the virtual guest systems each have their own root file system but share the kernel of the host operating system.
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