Tool for monitoring several linux desktops

Hi i currently administer a small office all with linux machines. I also have a server that is up all the time. I'm looking for a tools to automate the processs of watching the desktops if they are behaving well. Something that is client-server. I can use the seerver that is always on to send me emails. I would like to monitor the desktops to see if they are healthy and replace parts or do mainteinace before they fail. Currently im working with very old computers so hard disk failure is common (one every two months), and also sometimes the users fill up the hard disk.
Is there a tool that can send information from all these computers to a central server and then anaylze it? Im looking for info produced by smartmontools and df, and maybe other program, but im not looking for information on the network, as it is not very crucial and theyre desktop machines not servers.
Ive looked at nagios but i think is overkill and mainly for servers.
I just run around 12 computers with linux, all of them desktops except for one.
Also is there a way to automate the update and installation of software of these machines? currently im using webmin cluster module for sending instructions to all of them, but it is rather clumsy.
Is there such a tool, or should i relly in some custom solution, maybe bash scripts + ssh ?

Unless your out of hard drive slots you have all those drives from the clients that keep going out. If you had a backup tape system that would clear the single point of failure problem. Of course, you can put the PXE install on a separate disk.
hydrosIII wrote: i dont trust them as much as for putting rootless machines in the desktops
The server that is serving the PXE clients, is impervious to the actual PXE installation. It is efficient however to maintain, because you can use the main server's package cache (assuming you pay attention to differing architectures), and pacman into the PXE client installation specifying the PXE root for operations affecting the PXE installation. You can run the PXE clients without disks in them. On the windows side, there are windows installations via PXE and iSCSI. Nothing says you can't use sshfs instead of nfs for the clients. You wouldn't need to necessarily log into the PXE clients root account to make changes. Most of that could be done from the server that it resides on. Point two is that the files actually serving the PXE clients can be on a totally different computer pointed to by DHCP. You can turn the router DHCP off, and have the requests answered by Arch's dhcpd.

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