set system dns server ubuntu code example

Example 1: add dns in ubuntu permanently

sudo apt update
sudo apt install resolvconf

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

sudo vim /etc/resolvconf/resolv.conf.d/head
and add the following lines in it:
nameserver 8.8.8.8 
nameserver 8.8.4.4

sudo systemctl start resolvconf.service

Example 2: 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