server how to add dns at ubuntu code example

Example 1: ubuntu dns server

# /etc/resolv.conf. A couple of quick entries like 
# so would have my machine reaching the outside world like a champ:

nameserver 8.8.4.4
nameserver 8.8.8.8

Example 2: resolvconf set dns

$ sudo systemctl start resolvconf.service
$ sudo systemctl enable resolvconf.service
$ sudo systemctl status resolvconf.service