Nagios Support Forum

Hello all! I installed Nagios to monitor the hosts and services associated with them in a cluster with 3 nodes. I have considered one of them as the monitoring server. As of now, I have added few plugins to monitor some required services. I am using check_nrpe to gather data from remote hosts. After installing NDOUtil, I am able to get all the data populated into the database tables. From where has been these data copied? Is it from the status.dat file of the monitoring server? I can get the remote hosts and services details updated on the status.dat file of the server. I guess check_nrpe does this. Please correct me if I am wrong. In the official documentation they have used a term called 'nagios instance'. What does 'instance' refer to?

A Nagios Instance is a stand alone Nagios server, in the example shown here:

http://nagios.sourceforge.net/docs/ndou ... OUtils.pdf

There are several Nagios server's. I do believe the documentation does show the entire process of how information is reaped and stored by NDOUtils. Is there a specific part you do not understand in the document?

According to my setup, I want to monitor two remote machines from the server machine. Imagine I have not installed NRPE in any of these machines. And I have installed Nagios on all these machines. So now first I have to gather details from remote machines to the server machine and then should copy these details to the server machine database. I did not exactly understand where I should install NDOMOD and where NDO2DB.
Should I install NDOMOD only on the remote machines with tcp socket enabled and NDO2DB only on the server machine?

I have installed:
Nagios on all three machines,
MySql only on the server machine.

Thank you

We need to stop here for a moment. You are running nagios core on all three systems? Are they going to be monitoring other remote hosts or just themselves?