Docker study
http://web.archive.org/web/20150326185901/http://blog.dotcloud.com/under-the-hood-linux-kernels-on-dotcloud-part
https://stackoverflow.com/questions/34820558/difference-between-cgroups-and-namespaces
https://stackoverflow.com/questions/16047306/how-is-docker-different-from-a-normal-virtual-machine?rq=1
https://blogs.rdoproject.org/7761/hands-on-linux-sandbox-with-namespaces-and-cgroups