====== Ubuntu ======
  * Given the fact that debian is pretty conservative distribution it is better to use ubuntu as a host system - even on LTS Ubuntu Server 14.04 it is recommended to upgrade docker via its repository. This can be done following this tutorial:
http://www.bogotobogo.com/DevOps/Docker/Docker_Install_On_Ubuntu_14.php

====== Bare metal installation  ======
<code>apt-get install docker.io</code>

====== Xen server installation ======
  * linux kernel > 3.2 needed -> kind of problem, our xen servers has 3.0 kernels
  * best way is to extract kernel (vmlinuz and initramfs) from VPS and point to them in the cfg
  * then <code>apt-get install docker.io</code>