Changing the DNS servers Ubuntu Server 20.04 - Arm64 (Raspi)

I am running Ubuntu server 20.04 on a Raspberry Pi 4 and I am having difficulty updating the DNS entry in resolv.conf. resolv.conf points to the nameserver 127.0.0.53; however, I disabled the systemd-networkd dnsstublistener so I could run my own DNS server. How can I change the nameserver to point to 127.0.0.1 instead?

2 Answers

Use netplan instead of resolv.conf

cd /etc/netplan
ls
sudo nano 50-cloud-init.yaml

Add nameservers entry.

network: ethernets: [network-device]: ... nameservers: addresses: - 2001:4860:4860::8888 - 2001:4860:4860::8844 - 8.8.8.8 - 8.8.4.4

Then to apply and test:

sudo netplan apply
systemd-resolve --status

I discovered that my changes were not being applied to resolv.conf because of a symbolic link issue. To fix, I first deleted the file /etc/resolv.conf, which was a symbolic link to /run/systemd/resolve/stub-resolv.conf, and then created a new link to /run/systemd/resolve/resolv.conf.

sudo rm /etc/resolv.conf
sudo ln -s /run/systemd/resolve/resolv.conf /etc/resolv.conf