This tutorial by Linux Help shows us how to install Nagios, an open source system/network monitoring tool, on FreeBSD. Follow the link below for the full set of instructions, or watch the video tutorial below:

nagios-logo4_9mz1-640To install and configure Nagios on FreeBSD

Nagios is an open source system and network  monitoring tool. Nagios can monitor and alter its services for servers, switches, applications and servers. It alerts the user when there is an error, and notifies them again once the error is resolved.

Features

  • Monitoring network services such as SMTP,POP3,HTTP,PING,etc
  • Monitoring host resources
  • Simple plug-in design
  • Contact Notifications for problems
  • Automatic Log Rotation
  • Can define network host hierarchy using parent host
  • Support for implementing redundant monitoring hosts

https://www.linuxhelp.com/install-nagios-monitoring-tool-in-freebsd/