I've used managed power strips for data center applications in the past. The strips have individually addressable power ports and a web interface, telnet, as we

I've used managed power strips for data center applications in the past. The strips have individually addressable power ports and a web interface, telnet, as well as SNMP support. They've been around for decades and are the solution to your problem of needing to remotely manage the power state of power hungry devices. If you set your servers to always power on after power is restored you can control them with that device. There's also Wake On Lan (WoL) support in a lot of systems, where you can use a correctly crafted "magic frame" to wake up any machine that received it.