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2.1. Installation
First, on server01 install the nagios package. In a terminal enter:
sudo apt install nagios3 nagios-nrpe-plugin
You will be asked to enter a password for the nagiosadmin user. The user's credentials are stored in /etc/ nagios3/htpasswd.users. To change the nagiosadmin password, or add additional users to the Nagios CGI scripts, use the htpasswd that is part of the apache2-utils package.
For example, to change the password for the nagiosadmin user enter:
sudo htpasswd /etc/nagios3/htpasswd.users nagiosadmin
To add a user:
sudo htpasswd /etc/nagios3/htpasswd.users steve
Next, on server02 install the nagios-nrpe-server package. From a terminal on server02 enter:
sudo apt install nagios-nrpe-server
NRPE allows you to execute local checks on remote hosts. There are other ways of accomplishing this through other Nagios plugins as well as other checks.