I am still new to Nagios so please excuse me if i sound stupid. I have Nagios installed and i want to use it to monitor different applications, for example dansguardian, postfix.....On the GUI there are options to define hosts, commands and services.
There are default commands here for example to check_alive, check-apache!!!
How do i create my own to monitor dansguardian and postfix all sitting remotely on a remote server.