Linux Containers
https://help.ubuntu.com/12.04/serverguide/lxc.html
https://www.stgraber.org/2012/11/16/running-steam-in-a-lxc-container/
http://www.plurk.com/m/p/hym1xb
http://www.plurk.com/m/p/ht08ll
sudo lxc-create -t ubuntu -n precise-armel -- -F -a armel -r precise 的 -F 是 --flush-cache 把 cache 刪掉重頭來的意思