In the GNU/Linux ecosystem there isn’t really a standardized way for applications to resolve domain names.
Some application use NSS, some use D-Bus, others use stub resolvers.
systemd-resolved handles all of those methods and comes with systemd that Arch Linux uses.
systemd-resolved configuration file is at /etc/systemd/resolved.conf, yours should look like this:
[Resolve]
DNS=1.1.1.1
FallbackDNS=127.0.0.1 ::1
Domains=~.
#LLMNR=yes
#MulticastDNS=yes
DNSSEC=yes
DNSOverTLS=yes
#Cache=yes
#DNSStubListener=yes
#ReadEtcHosts=yes
You should enable the systemd-resolved service.
sudo systemctl enable --now systemd-resolved
NetworkManager
Since you are probably using NetworkManager,
you should tell it to use systemd-resolved by going to its configuration file (/etc/NetworkManager/NetworkManger.conf)
and specifying dns property.
This is how your /etc/NetworkManager/NetworkManger.conf should look like:
[main]
plugins=keyfile
dns=systemd-resolved
You will probably need to restart your computer for changes to take effect.
If you found any mistakes or that something is outdated, please feel free to contact me or contribute to this site’s repository.