How to easily set DNS in Linux

This post below are the steps on how to configure primary and secondary DNS :

1. Login as root
2. Modify file /etc/resolv.conf

   vi /etc/resolv.conf
   

3. Add lines below

   nameserver 192.168.6.17
   nameserver 192.168.6.18
   

   You must replace DNS IP on your own
4. Save and close the file
5. To test DNS use one of the following command :

$ host google.com
$ dig google.com
$ ping google.com
$ nslookup your-domain.com