OpenVZ

OpenVZ is a container-based virtualization for Linux which allows the running of multiple secure, isolated Linux containers also known as virtual environments (VEs) and virtual private server (VPS) on a single physical server. OpenVZ enables better server utilization and ensures that applications do not conflict. It is similar to LXC. It can only run on a Linux-based OS. Since all OpenVZ containers share the same kernel version as hosts, users are not allowed to do any kernel modification. However, it also has the advantage of a low memory footprint due to the shared host kernel.