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Ubuntu: Set OpenDNS DNS Server

How do I set OpenDNS DNS server under Ubuntu Linux desktop operating systems by editing configuration files?

There are two types of configurations under Ubuntu Linux operating systems as per your IP configuration.

Static IP Configuration

If your Ubuntu box is configured to use static IP via /etc/network/interfaces edit /etc/resolv.conf file and add opendns dns server names, run (open a terminal and type the commands):
sudo vi /etc/resolv.conf
Edit / add nameserver settings as follows

nameserver  208.67.222.222
nameserver 208.67.220.220

Save and close the file.

DHCP IP Configuration

If you are getting IP address via DHCP edit /etc/dhcp3/dhclient.conf, run (open a terminal and type the commands):
sudo vi /etc/dhcp3/dhclient.conf
Add the following option config section.

option domain-name-servers 208.67.222.222,208.67.220.220

Save and close the file. Restart the computer or obtain dhcp IP again by typing the following command:
dhclient
OR
dhclient eth0

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