moparisthebest/kiss-ntpd/pipeline/head This commit looks good Details
An NTP server that Keeps It Simple, Stupid.
It simply responds to NTP queries with the current system time, it doesn't fuss with leap seconds or stratum or any of those other things we don't care about. It will simply synchronize your clock to the server's clock rather closely and that's it.
Host this on your router for all your LAN clients, and let systemd-timesyncd or another ntp client keep that clock in sync.
usage: kiss-ntpd [options...] [bind_addresses...]
-h, --help print this usage text
-V, -v, --version Show version number then quit
If no bind_addresses supplied, defaults to 0.0.0.0:123
There is an example systemd unit in
systemd/kiss-ntpd.service which runs it with minimal permissions
and as locked down as possible.
Many thanks to rsntp from which I forked this code.