Um, alternatively, if your /etc/resolv.conf gets changed automatically,
you can prevent access to modifying it (Even root can't modify) by
giving:

sudo chattr +i /etc/resolv.conf

(You can undo this by manually giving -i later, if you need something
changed within)

-- 
dhcp periodicall effectively empties /etc/resolv.conf
https://bugs.launchpad.net/bugs/158062
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