ubuntu cli resolvconf tutorial set 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: resolvconf set dns

sudo systemctl disable systemd-resolved.service
sudo gedit /etc/resolvconf/resolv.conf.d/head 
# add
nameserver 8.8.8.8
nameserver 8.8.4.4

sudo resolvconf --enable-updates
sudo resolvconf -u