Nagios Support Forum

This morning we had an activity on our Nagios server, whereby we inserted new disks into the server, and rebooted the server.

The disk implementation failed, therefore we had to revoke the changes, and rebooted the server once again.

The server was up and running at 6:00 am this morning. However, after 2 hours, the nagios monitoring does not show any data (percentage of usage, etc for the services like cpu, memory, disk, etc).

What could be the problem, and how do we resolve this?

Could you post a screenshot showing us what the current states are for services? Also, can you post your entire /usr/local/nagios/var/nagios.log for us to look at?

This should help us further figure out what's going on.

Unfortunately the /usr/local/nagios/var/nagios.log is completely empty.

Attached is the screenshot of the graph that does not display when I click on the graph beside the CPU Utilization.
The monitoring stopped at 3:15 am yesterday morning.

The log in /usr/local/pnp4nagios/var/perfdata (perfdata.log) has some information, till 3:15 am yesterday.

It could be that the Nagios Daemon didn't startup, can you login to the server and run the following to do that?
service nagios start

If that doesn't work, run the nagios verification to see what the errors are so see why it is not running.