Proxmox VE is a complete virtualization management solution for servers. By design it support two very popular virtualization techniques: OpenVZ and KVM. OpenVZ is container-based virtualization for Linux. However, only supported by pretty ancient kernel: 2.6.32. Lately I gave another try to check whether we can use and replace OpenVZ with a new functionality present in latest kernels (3.14) the cgroups.
And guest what? Not perfect, but more or less it's working!