DNS: Linux

On Linux, there are various different methods your system may be handling DNS; we cover the most common ones here.

The instructions below aim to not just tell you how to set up the DNS, but to help find out which applies to you.

systemd-resolvd

Run systemctl is-active systemd-resolvd. If that reports active:

sudo mkdir -p /etc/systemd/resolved.conf.d
printf '[Resolve]\nDNS=127.0.0.1:43770\nDomains=~test\n' \
  | sudo tee /etc/systemd/resolved.conf.d/devconcurrent.conf
sudo systemctl restart systemd-resolved

NetworkManager

NOTE: These instructions should work, but I do not have a system that uses NetworkManager for DNS. If you use them, please report back!

Run systemctl is-active NetworkManager. If that reports active:

NetworkManager only does conditional DNS forwarding when it’s using its dnsmasq backend, which is not the default. Check whether it’s enabled:

NetworkManager --print-config | grep -A3 '\[main\]'

If dns isn’t dnsmasq, enable it with a drop-in:

printf '[main]\ndns=dnsmasq\n' | sudo tee /etc/NetworkManager/conf.d/dns.conf

Then tell dnsmasq to forward .test to devconcurrent:

printf 'server=/test/127.0.0.1#43770\n' \
  | sudo tee /etc/NetworkManager/dnsmasq.d/test.conf

Then restart NetworkManager:

sudo systemctl restart NetworkManager

NixOs

On NixOs, you can configure resolved declaratively:

services.resolved = {
  enable = true;
  settings.Resolve = {
    DNS = "127.0.0.1:43770";
    Domains = "~test";
  };
};

Other

If none of this works for you, please file an issue.