I was surprised that nagios plugins didn’t come with a pre-packaged check_crond command! Anyway, here is a quick way to do it using NRPE. Add the command definition in command.cfg. define command{ command_name check_crond command_line $USER1$/check_nrpe -n -H $HOSTADDRESS$ -t 90 -c check_crond } Add the service definition to an existing host. define service{ use local-service host_name gnucom.cc s