How to configuring nagios

Hi

I installed nagios on RHEL4. But i have no idea to configuring it. I go thro
the documentation also. Its quite tough. Please help me, how to configuring
nagios. I got the following error, after installed nagios

Checking services…
Error: There are no services defined!
Checked 0 services.
Checking hosts…
Error: There are no hosts defined!
Checked 0 hosts.
Checking host groups…
Error: There are no host groups defined!
Checked 0 host groups.
Checking service groups…
Checked 0 service groups.
Checking contacts…
Error: There are no contacts defined!
Checked 0 contacts.
Checking contact groups…
Error: There are no contact groups defined!
Checked 0 contact groups.
Checking service escalations…
Checked 0 service escalations.
Checking service dependencies…
Checked 0 service dependencies.
Checking host escalations…
Checked 0 host escalations.
Checking host dependencies…
Checked 0 host dependencies.
Checking commands…
Checked 6 commands.
Checking time periods…
Checked 0 time periods.
Checking extended host info definitions…
Checked 0 extended host info definitions.
Checking extended service info definitions…
Checked 0 extended service info definitions.
Checking for circular paths between hosts…
Checking for circular host and service dependencies…
Checking global event handlers…
Checking obsessive compulsive processor commands…
Checking misc settings…

Total Warnings: 0
Total Errors: 5

You need to start looking at the config files and examples. Basically you don’t have anything defined so nagios doesn’t know what to do. Maybe try finding a basic config and editing it might make it easier.

first u create a localhost.cfg file hostgroup.cfg hosts.cfg file in /usr/local/nagios/etc

u will get all these sample file in u r nagios folder