Changing nameservers
From Pulsed Media Wiki
On most Linux servers the nameservers are in /etc/resolv.conf Edit this file, with for example vim
vim /etc/resolv.conf
Format of the file is nameserver a.b.c.d, example resolv.conf with google dns servers:
nameserver 8.8.8.8 nameserver 8.8.4.4
search line means which domain is searched for that host if specified name is not FQDN. Ie. if you have:
search pulsedmedia.com
and you do host servera on shell, it will try finding servera.pulsedmedia.com