Nagios stores its configuration in a separate directory. Usually it's either in /etc/nagios or /usr/local/etc/nagios. If you followed the steps for a manual installation, (as described above) it would be in /etc/nagios.
The main configuration file is called nagios.cfg, which is the main file that is loaded during Nagios startup. Its syntax is simple — a line beginning with # is a comment, and all lines in the form<parameter>=<value> will set a value. In some cases, a value might be repeated (such as specifying additional files/directories to read).
The following is a sample of Nagios's main configuration file:
# log file to use log_file=/var/nagios/nagios.log # object configuration directory cfg_dir=/etc/nagios/objects # storage information resource_file=/etc/nagios/resource.cfg status_file=/var/nagios/status.dat status_update_interval=10 (...)
The main configuration file needs to define a log file to use, and that has to be passed as...