The OS is in between the service and the bare metal. Something like OPNsense can be said to be running on bare metal because the OS and the firewall service are so intertwined. However, something like firewalld isn’t running on the bare metal because it’s just a service of the operating system.

That’s how I understand it anyway, I’m not a pro

myanonamouse rocks. I think it’s just an interview to get in still. Trivial to build ratio.

I use Calibre for management. It’s a little clunky but it manages thousands of titles easily, probably tens of thousands.