[Fizzadar]

This. I've used OpenVZ for internal containerisation (before the whole Docker explosion) without any issues. It's fast and provides what feels like a fully blown virtual machine. Yes, it's a bit out of date these days (being on Linux 2.6), but it's still an incredibly useful tool, and I see no reason to stop using it.

[smcleod]

Kernel 2.6 is more than a bit out of date, ok maybe kernel 3.18 is a bit out of date but kernel 2.x (and really 3.x) is /really/ out of date.

[ligurio]

Actually, OpenVZ based on RHEL7 (3.10+) kernel is available. https://lists.openvz.org/pipermail/announce/2016-July/000664...

[kolyshkin]

Again, please, don't judge kernel by its version number. The kernel that RHEL6 comes with has version of 2.6.32, but it's as far from "vanilla" 2.6.32 as Chicago from Seattle. It has tons of patches (with OpenVZ patchet being only about 10% of it). There's a somewhat old comparison about RHEL5 patch set that you can see here: http://openvz.livejournal.com/27592.html