Kernel

Namespaces
http://www.haifux.org/lectures/299/netLec7.pdf
https://jvns.ca/blog/2016/10/10/what-even-is-a-container/

cgroups
http://www.admin-magazin.de/Das-Heft/2011/06/Cgroups-zur-Ressourcenkontrolle-in-Linux
http://www.pro-linux.de/artikel/2/1464/ressourcen-verwaltung-mit-control-groups-cgroups.html

Video:
Cgroups, namespaces, and beyond: what are containers made from?

chroot
http://www.ubuntubuzz.com/2015/09/a-basic-chroot-example-in-ubuntu.html?m=1
https://wiki.archlinux.org/index.php/change_root