This is a small tool to enable the systemd-networkd service as well as resolvectl to enable per-interface DNS settings. We take this directly from zerotier-one (on your machine) metadata. This service does not reach out to the internet on its own.
The result is per-interface DNS settings, which is especially nice when you are using zeronsd with multiple networks.
Compile it with golang:
# be outside of gopath when you do this
go get github.com/zerotier/zerotier-systemd-managerInstall our slightly modified zerotier-one.service file in /usr/lib/systemd/system on Ubuntu, but this location may be different for other operating systems. This will make zerotier-one depend on systemd-networkd.
Ensure systemd-networkd is properly configured and resolvectl works as intended.
Finally, run the tool as root: zerotier-systemd-manager. If you have interfaces with DNS assignments in ZeroTier, it will populate files in /etc/systemd/network. No DNS assignment, no file. Unless you have passed -auto-restart=false, it will restart systemd-networkd for you if things have changed.
Finally, if you have left a DNS-controlled network it will try to remove the old files if -reconcile=true is set (the default). This way you can stuff it in cron and not think about it too much.
Enjoy!
Erik Hollensbe github@hollensbe.org
BSD 3-Clause