System Monitoring with OpenBSD - PhxBUG Nagios - Defining a Service So, our server 'canyon' is our department's guest FTP server. It runs FTP for people to share files, and SSH so we can manage it. So, we put it in two hostgroups ... dept_ftpservers and dept_sshservers. Well, we have other servers that run FTP, and others that run SSH, and others that run both. Instead of defining a service object for every combination of servers and services, you can run checks based on groups ... define service{ use generic-service hostgroup_name dept_ftpservers service_description FTP is_volatile 0 check_period 24x7 max_check_attempts 4 normal_check_interval 5 retry_check_interval 1 contact_groups glgtso notification_interval 960 notification_period 24x7 check_command check_ftp }