It has been said that "'best' is the enemy of 'good enough'". The Network File System (NFS) may be a good example. It's often overlooked in favor of more capable (but more complex!) resource sharing software like Samba, which can network easily with Windows computers. But if you have a home LAN with a lot of GNU/Linux machines on it, you don't need Samba. NFS will do just fine, and it's very simple to set up. I've been using this configuration for about 10 years now (essentially since I started using GNU/Linux in the first place).
Zenoss is extremely configurable, so it can probably be set up to tell you just about anything you want to know about the computers you are monitoring. I'm just going to go through some of the things I personally was most interested in for my LAN computers, and then for my web server.
NFS is a network protocol with which many UNIX-administrators have a love/hate relationship. On the one hand, it’s the ideal protocol if you need to export a filesystem from a UNIX-like system. On the other, it has a bit of a reputation of being insecure. Since a rogue system can just tell an NFS server that “hey, I’m representing a user with UID 1000, please remove all the files in my home directory”, this reputation may not be totally undeserved.
Or is it?