Nagios Support Forum

I have Nagios 4.0.8 running on Ubuntu 14.04 and am trying to monitor more than just ping on a remote Ubuntu 14.04 host. Any help?

I am getting the following error from the webpage:

Return code of 127 is out of bounds - plugin may be missing

nagios owns the plugin:

-rwxr-xr-x 1 nagios nagios 22992 Sep 25 15:03 check_nrpe

This is service defined in the cfg for the server being monitored:

define service{
use generic-service
host_name remotehost01
service_description Root Partition
check_command check_nrpe!check_root!
}

Here is check_nrpe defined in commands.cfg:

define command{
command_name check_nrpe
command_line $USER$/check_nrpe -H $HOSTADDRESS$ -t 30 -c $ARG1$ $ARG2$
}

Here is part of the /etc/nagios/nrpe.cfg on the remote host:

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_hda1]=/usr/lib/nagios/plugins/check_disk -w 20% -c 10% -p /dev/hda1
command[check_root]=/usr/lib/nagios/plugins/check_disk -w 20% -c 10% -p /dev/mapper/remotehost01-root
command[check_zombie_procs]=/usr/lib/nagios/plugins/check_procs -w 5 -c 10 -s Z
command[check_total_procs]=/usr/lib/nagios/plugins/check_procs -w 150 -c 200

And here is output when manually running the check from the nagios server:

root@NAGIOS01:/usr/local/nagios/etc/objects/ccc/servers# /usr/local/nagios/libexec/check_nrpe -H 172.16.x.x -c check_root
DISK OK - free space: / 24587 MB (89% inode=94%);| /=2781MB;23085;25971;0;28857
root@NAGIOS01:/usr/local/nagios/etc/objects/ccc/servers#

What are the permissions of /usr/lib/nagios/plugins/check_disk on the remote host?

Everything in /usr/lib/nagios/plugins on remote host is root. Should it be nagios?

-rwxr-xr-x 1 root root 126016 Jul 5 2013 check_disk

Bah, I see now what was wrong. The defined command had a typo.

Changed from:

define command{
command_name check_nrpe
command_line $USER$/check_nrpe -H $HOSTADDRESS$ -t 30 -c $ARG1$ $ARG2$
}

To:

define command{
command_name check_nrpe
command_line $USER1$/check_nrpe -H $HOSTADDRESS$ -t 30 -c $ARG1$ $ARG2$
}

Ooooh, subtle. I always hate stuff like that. But hey, glad to see it's working. Gonna lock this up now.