Nagios Support Forum

both files are attached.

Ok @Box293

But why I am getting check_memory command not defined error.

plugin exist, command defined, running on client side successfully.

Its behaving abnormally on one server only....

Is the nrpe.cfg file you posted a few days ago from the server that is having the issue?
If not, can you post it.
Also, post the command you are running on the Nagios server.

nrpe.cfg
=======
log_facility=daemon
pid_file=/var/run/nrpe.pid
server_port=5666
nrpe_user=nagios
nrpe_group=nagios
allowed_hosts=127.0.0.1,1.2.3.4
dont_blame_nrpe=1
allow_bash_command_substitution=0
debug=0
command_timeout=60
connection_timeout=300
#allow_weak_random_seed=1


#######Commands###########################
##############################################################################################

command[check_users]=/usr/lib/nagios/plugins/check_users -w 5 -c 10
command[check_cpu]=/usr/lib/nagios/plugins/check_cpu -c 05 -w 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_zombie_procs]=/usr/lib/nagios/plugins/check_procs -w 5 -c 10 -s Z
command[check_procs]=/usr/lib/nagios/plugins/check_procs -w 400 -c 500
command[check_ssh]=/usr/lib/nagios/plugins/check_ssh -H 127.0.0.1 -p22
command[check_swap]=/usr/lib/nagios/plugins/check_swap -w 30 -c 20
command[check_memory]=/usr/lib/nagios/plugins/check_memory -f -w 8 -c 5
command[check_disk]=/usr/lib/nagios/plugins/check_disk -w 08% -c 05% -p /
command[check_ntp]=/usr/lib/nagios/plugins/check_ntp -H 127.0.0.1 -w 10 -c 20
command[check_uptime]=/usr/lib/nagios/plugins/check_uptime
command[check_tcp22]=/usr/lib/nagios/plugins/check_tcp -H 127.0.0.1 -p 22 -w 30 -c 20
command[check_tcp5666]=/usr/lib/nagios/plugins/check_tcp -H 127.0.0.1 -p 5666 -w 30 -c 20
command[check_open_files]=/usr/lib/nagios/plugins/check_open_files -c 30 -w 50
command[check_memory]=/usr/lib/nagios/plugins/check_memory -f -w 08 -c 05

command on client side:

root@HADB01:/home/GIRU# /usr/lib/nagios/plugins/check_memory -f -w 8 -c 5
OK - 85.0% (24500848 kB) free.|TOTAL=28810492KB;;;; USED=4309644KB;26505652;27369967;; FREE=24500848KB;;;; CACHES=1892548KB;;;;

command on server side

[root@AXmonitor vmn]# /usr/local/nagios/libexec/check_nrpe -H 2.3.5.6 -p 5666 -c check_memory
NRPE: Command 'check_memory' not defined

In your locate nrpe.txt file I see the following:

/etc/nagios/nrpe.cfg
/usr/local/nagios/etc/nrpe.cfg
/etc/xinetd.d/nrpe

In your ps -ef.txt file I see the following:

nagios 34824 1 0 21:08 ? 00:00:00 /usr/sbin/nrpe -c /etc/nagios/nrpe.cfg -d
root 51453 1 0 14:36 ? 00:00:00 /usr/sbin/xinetd -pidfile /run/xinetd.pid -stayalive -inetd_compat -inetd_ipv6

You would assume that /etc/nagios/nrpe.cfg is the file that is being used, however I also see that NRPE is running via xinetd which makes me think that you have two separate copies of NRPE running / trying to run.

This command: Will stop xinetd from running an instance of nrpe. You may need to restart the xinetd service.
You should then make any changes to /etc/nagios/nrpe.cfg

I did the same

mv /etc/xinetd.d/nrpe /var/tmp/

and /etc/init.d/xinetd restart

I got (Return code of 255 is out of bounds) error on all services and nrpe was listening on tcp only

root@HADB01:/var/tmp# netstat -an |grep 5666
tcp6 0 0 :::5666 :::* LISTEN

I revert the change and, now nrpe is listening as

root@HADB01:/var/tmp# netstat -an |grep 5666
tcp 0 0 0.0.0.0:5666 0.0.0.0:* LISTEN
tcp6 0 0 :::5666 :::* LISTEN

After revert that change, still getting check_memory command not defined.

Kindly suggest.

Thank you!

In the "nrpe.cfg" you have the "check_memory" command defined twice.

command[check_memory]=/usr/lib/nagios/plugins/check_memory -f -w 8 -c 5
command[check_memory]=/usr/lib/nagios/plugins/check_memory -f -w 08 -c 05

Remove the bottom one, and restart xinetd. Did this help?

No, this did not help me to solve my problem.
Thank you!

Please post your nrpe.cfg for us to review once again.