https://en.wikipedia.org/wiki/OpenVZ OpenVZ is not true virtualization but really containerization like BSD Jails.
(...) it doesn't have the overhead of a true hypervisor, it is very fast and efficient.
Il y a donc
un seul OS à la fois : ni émulation, ni paravirtualisation! C'est une BSDrie améliorée.
Using OpenVZ it's only possible to use some VPN technologies based on PPP (such as PPTP/L2TP) and TUN/TAP. IPsec is not supported inside containers. L2TP secured with IPsec is unsupported as well.
Ce n'est pas ce que j'appelle un serveur virtuel!
Et bien sûr, impossible de faire insmod/rmmod.