I'm trying to get memory metric from client machine. I installed nrpe in client machine and works well for default checks like load, users and all.
Manual output from client machine,
root@Nginx:~# /usr/lib/nagios/plugins/check_mem -w 50 -c 40
OK - 7199 MB (96%) Free Memory
But when i try from server, other metrics works but memory metrics not working,
[ec2-user@ip-10-0-2-179 ~]$ /usr/lib64/nagios/plugins/check_nrpe -H 107.XX.XX.XX -c check_mem
NRPE: Unable to read output
Other metrics works well
[ec2-user@ip-10-0-2-179 ~]$ /usr/lib64/nagios/plugins/check_nrpe -H 107.XX.XX.XX -c check_load
OK - load average: 0.00, 0.01, 0.05|load1=0.000;15.000;30.000;0; load5=0.010;10.000;25.000;0; load15=0.050;5.000;20.000;0;
I ensured that check_mem command has execution permission for all,
root@Nginx:~# ll /usr/lib/nagios/plugins/check_mem
-rwxr-xr-x 1 root root 2394 Sep 6 00:00 /usr/lib/nagios/plugins/check_mem*
Also here is my client side nrpe config commands
command[check_users]=/usr/lib/nagios/plugins/check_users -w 5 -c 10
command[check_load]=/usr/lib/nagios/plugins/check_load -w 15,10,5 -c 30,25,20
command[check_disk]=/usr/lib/nagios/plugins/check_disk -w 20% -c 10% -p /dev/sda1
command[check_zombie_procs]=/usr/lib/nagios/plugins/check_procs -w 5 -c 10 -s Z
command[check_procs]=/usr/lib/nagios/plugins/check_procs -w 200 -c 250
command[check_http]=/usr/lib/nagios/plugins/check_http -I 127.0.0.1
command[check_swap]=/usr/lib/nagios/plugins/check_swap -w 30 -c 20
command[check_mem]=/usr/lib/nagios/plugins/check_mem -w 30 -c 20
Can anyone help me to fix the issue?