In the realm of decentralized services, I think that consul is really, really overlooked, especially the potential of consul, coupled with ultra-low-cost servers. Once a machine is in a consul cluster, it is "bound" to the consul master and that master can execute commands on it as though it were root.  

Consul also manages services and service discovery.

It can be run alongside Nomad, which can schedule anything that can be run on linux in an extremely neat, tight fashion.