Nagios Support Forum

/ Disk Usage
Unknown 9d 19h 48m 1s 5/5 2019-05-06 11:28:55 NRPE: Command 'check_disk' not defined
CPU Stats
Unknown 9d 19h 47m 41s 5/5 2019-05-06 11:30:04 NRPE: Command 'check_cpu_stats' not defined
Cron Scheduling Daemon
Unknown 9d 19h 47m 18s 5/5 2019-05-06 11:30:23 NRPE: Command 'check_init_service' not defined
Memory Usage
Unknown 9d 19h 46m 32s 5/5 2019-05-06 11:32:02 NRPE: Command 'check_mem' not defined
Open Files
Unknown 9d 19h 51m 13s 5/5 2019-05-06 11:32:17 NRPE: Command 'check_open_files' not defined
SSH Server
Unknown 9d 19h 50m 27s 5/5 2019-05-06 11:27:52 NRPE: Command 'check_init_service' not defined
Swap Usage
Unknown 9d 19h 50m 14s 5/5 2019-05-06 11:28:09 NRPE: Command 'check_swap' not defined
Total Processes
Unknown 9d 19h 49m 23s 5/5 2019-05-06 11:28:39 NRPE: Command 'check_procs' not defined
Yum Updates
Unknown 9d 19h 48m 34s 5/5 2019-05-06 11:29:27 NRPE: Command 'check_yum' not defined

This usually means that the common.cfg or nagios.cfg on the remote server doesn't contain the command definitions to run the checks. How did you install NRPE? These commands should be defined if you followed https://assets.nagios.com/downloads/nag ... _Agent.pdf . I've attached the common.cfg that defines the commands here in case you need to update yours. https://support.nagios.com/kb/article/n ... d-612.html has some general information regarding the NRPE agent configuration.