[Fnoord]

Funny, systemd is like an opposite of wireguard in design goal. I believe the UNIX way would be /etc/hosts but some way to sync these within clients. Like etcd or whatever.

[jeltz]

An issue with /etc/hosts is that it is just one file and you do not want etcd to own all the config you would need to use something like NIS instead.

[Fnoord]

Ah yes, my bad. /etc/nsswitch.conf (which is also a Linux-ism but BSDs have something similar) supports LDAP. However, an advantage of /etc/hosts is the low latency since its not networked, while LDAP would result to overhead. Still, I believe that would be a suitable alternative. There's some non-bloated alternatives to OpenLDAP, and also an option could be caching.