https://www.webhostingtalk.com/showthread.php?t=1643781
https://www.digitalocean.com/community/tutorials/how-to-limit-resources-using-cgroups-on-centos-6
https://en.wikipedia.org/wiki/Cgroups
https://en.wikipedia.org/wiki/OpenVZ
https://www.webhostingtalk.com/showthread.php?t=1643781
https://www.digitalocean.com/community/tutorials/how-to-limit-resources-using-cgroups-on-centos-6
https://en.wikipedia.org/wiki/Cgroups
https://en.wikipedia.org/wiki/OpenVZ