If you are using ubuntu 14.04, you may find you can not setting dns on your /etc/resolv.confubuntu
This is because ubuntu using resolvconf to manage the dns setting, every times system boot, resolvconf will regenerate resolv.conf file.vim
But there always have way to do this.this
vim /etc/resolvconf/resolv.conf.d/head
put your nameserver list inspa
nameserver 8.8.8.8 nameserver 8.8.4.4then run
resolvconf -u
this command tell resolvconf to regenerate the resolve file.net
enjoy it.server