http://www.netroby.com/view.php?id=3630#.U4aRT_mSzVo
Persist dns nameserver for ubuntu 14.04
If you are using ubuntu 14.04, you may find you can not setting dns on your /etc/resolv.conf
This is because ubuntu using resolvconf to manage the dns setting, every times system boot, resolvconf will regenerate resolv.conf file.
But there always have way to do this.
vim /etc/resolvconf/resolv.conf.d/head
put your nameserver list in
nameserver 8.8.8.8 nameserver 8.8.4.4then run
resolvconf -u
this command tell resolvconf to regenerate the resolve file
enjoy it.