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.
Based on my experiences running multiple servers and pcs on multiple distros for more than a decade, almost all problems originate between the keyboard and the chair attached to the machine running Linux.
Misconfiguration is usually the culprit.
Oh and important note: I run Arch BTW