Template:Linux-VServer
From What The Wiki?!
A soft partitioning concept based on 'Security Contexts' which allows to create many independent Virtual Private Servers (VPS), similar to normal Linux Servers, which can be run simultaneously on one box at full speed, sharing the hardware resources. All services, such as ssh, mail, Web and databases, can be started on such a VPS, without (or in special cases with only minimal) modification, just like on any real server. Each virtual server has its own user account database and root password and doesn't interfere with other virtual servers, except for the fact that they share the same hardware resources.
