The above-mentioned config files can be found in the /usr/local/nagios/etc/objects/ directory. Using RSS Automatically send a campaign whenever you update your site, or populate a draft email with content from an RSS feed. Let’s get started… Creating A Host Definition Before you can monitor a service, you first need to define a host that is associated with the service. Prerequisites The first time you configure Nagios Core to monitor a network switch, you’ll need to do a bit of extra work. Network Profiling Template This template analyzes the TCP/IP and UDP/IP connections an app uses.