Comment by chucky_z

systemd-fleet, by the original CoreOS folks. https://github.com/coreos/fleet

I used this when it was brand new for a bit and it was so incredibly smooth and worked so well. It solved the problem of controlling systemd units remotely so well. I'm pretty sure the only reason it never actually took off was kubernetes and coreos's acquisition, however it actively solves the 'other half' of the k8s problem which is managing the state of the host itself.