Plain old Linux system is the way to go. Mount your volumes, set `/etc/exports`, configure a keytab if you're into that sort of thing, and move on with life.

Plain old Linux system is the way to go. Mount your volumes, set `/etc/exports`, configure a keytab if you're into that sort of thing, and move on with life. It's honestly less messing around than any of the off the shelf tools. Depending on what you're doing you may want to mess with some kernel tunables. But even then, most of the time the defaults on a modern kernel are good enough for small stuff.