Using Google’s public DNS service as resolvers in your server
Google recently introduced this service. You can use this service as resolver for your server.
Login to your server as root
Background current resolver settings:
cp /etc/resolv.conf /etc/resolv.conf.backup
Open the file using vi:
vi /etc/resolv.conf
Remove the current entries by pressing dd
Put the following lines in the file:
nameserver 8.8.8.8
nameserver 8.8.4.4
Save the file and exit (press 
).
You are done!