The sort of program that once set up, just ticks along without fuss or bother forever.
For me, as I’m replacing the vms today which I set up five years ago and haven’t needed to touch since;
- HAProxy
- KeepaliveD
Not easy to learn, but once they’re running, they both go on forever.
Just some small consumer grade APC that I got like ten years ago. It’s basically good enough to withstand quick blips but I have it set to send a shutdown command to the server when the batteries fall below 90% because they last about as long as it takes to cleanly power down the machine.