I've just installed and started monitoring a few devices with Nagios 3 running on Fedora 11, but I have a few questions regarding monitoring on a larger scale.
What I'm confused with is how to start monitoring multiple devices with Nagios. From what I've been reading, I think this involves creating a hostgroup but I'm not excatly sure.
Also do I need to install an agent on all the nodes that I want to monitor? Can this be done via SNMP from the node that I'm monitoring?
Which config file do I edit in order to adjust the thresholds (I.E Disk space, Memory, etc..). We have some windows servers that have a small C:\ drive and the default thresholds aren't sufficent right now.
Thanks in advance,