Nagios Support Forum

The log file is attached. Can you view it?

Lets make sure your nrpe binary exists: Is there an appropriate entry in /etc/services? The following entry should appear at the end of /etc/services:
Please verify that the above entry exists. If it does not, add it and restart xinetd.

A couple of other things to check on: Check open ports: Try running the binary without xinetd: Check on ports again:

The output of those commands:

1. ls -l /usr/sbin/nrpe
ls: cannot access /usr/sbin/nrpe: No such file or directory

2. grep 5666 /etc/services
###UNAUTHORIZED USE: Port 5666 used by SAIC NRPE############
nrpe 5666/tcp

3. systemctl status xinetd -l
xinetd.service - Xinetd A Powerful Replacement For Inetd
Loaded: loaded (/usr/lib/systemd/system/xinetd.service; enabled)
Active: active (running) since Thu 2016-01-07 02:00:43 CST; 1 day 11h ago
Process: 1424 ExecStart=/usr/sbin/xinetd -stayalive -pidfile /var/run/xinetd.pid $EXTRAOPTIONS (code=exited, status=0/SUCCESS)
Main PID: 1435 (xinetd)
CGroup: /system.slice/xinetd.service
└─1435 /usr/sbin/xinetd -stayalive -pidfile /var/run/xinetd.pid

Jan 07 02:00:43 calendar-310-uaex-edu xinetd[1435]: removing discard
Jan 07 02:00:43 calendar-310-uaex-edu xinetd[1435]: removing discard
Jan 07 02:00:43 calendar-310-uaex-edu xinetd[1435]: removing echo
Jan 07 02:00:43 calendar-310-uaex-edu xinetd[1435]: removing echo
Jan 07 02:00:43 calendar-310-uaex-edu xinetd[1435]: removing tcpmux
Jan 07 02:00:43 calendar-310-uaex-edu xinetd[1435]: removing time
Jan 07 02:00:43 calendar-310-uaex-edu xinetd[1435]: removing time
Jan 07 02:00:43 calendar-310-uaex-edu xinetd[1435]: Must specify a server in nrpe
Jan 07 02:00:43 calendar-310-uaex-edu xinetd[1435]: xinetd Version 2.3.15 started with libwrap loadavg labeled-networking options compiled in.
Jan 07 02:00:43 calendar-310-uaex-edu xinetd[1435]: Started working: 1 available service

4. ss -nap | grep 5666
No output

5. /usr/sbin/nrpe -c /usr/local/nagios/etc/nrpe.cfg --inetd
-bash: /usr/sbin/nrpe: No such file or directory

It seems that the nrpe binary doesn't exist. How can I add it?

Does the binary exist anywhere?
It should exist somewhere - either in the directory where you installed nrpe from (typically /tmp) or somewhere else on the system. Be sure that xinetd knows exactly what to point to.

If the NRPE binary is in /tmp, be sure to copy it to somewhere sane (/usr/local/nagios/bin/ for instance).

Jesse

There are two nrpe files on this server. But I don't think either of them is what we are looking for, since they are not binary files.

1. cat /etc/xinetd.d/nrpe
# default: on
# description: NRPE (Nagios Remote Plugin Executor)
service nrpe
{
flags = REUSE
socket_type = stream
port = 5666
wait = no
user = nagios
group = nagios
# server = /usr/local/nagios/bin/nrpe
server = /usr/sbin/nrpe
server_args = -c /usr/local/nagios/etc/nrpe.cfg --inetd
log_on_failure += USERID
disable = no
only_from = 10.200.160.93 127.0.0.1
}

2. cat /tmp/nagjos/linux-nrpe-agent/subcomponents/nrpe/nrpe-2.15/package/solaris/pkg/nrpe
#!/sbin/sh
#

NRPE=/opt/nagios/bin/nrpe
CFGFILE=/etc/nagios/nrpe.cfg
PIDFILE=/var/run/nrpe.pid

case $1 in
'start')
$NRPE -c $CFGFILE -d
;;

'restart')
if [ -f "$PIDFILE" ]; then
/usr/bin/kill -HUP `/usr/bin/cat $PIDFILE`
fi
;;

'stop')
if [ -f "$PIDFILE" ]; then
/usr/bin/kill `/usr/bin/cat $PIDFILE`
/bin/rm -f $PIDFILE
fi
;;

*)
echo "Usage: $0 { start | restart | stop }"
exit 1
;;
esac

exit $?

I found a nrpe binary file on another box which is running CentOS 6.7 and has nrpe agent working fine on it. Can I copy that file to this OL 7 box?

Taking a step back, I reviewed your install.log. It appears you're missing libmcrypt

Can you run the following command, and post the output? Regarding copying the file - this may work at times, but usually not. As the binaries are compiled based off of your environment you could run into weird issues.

No output for "rpm -qa|grep libmcrypt".

You'll likely have to install the libmcrypt and libmcrypt-devel libraries, give the following a try.
Let us know if there are any problems with the above. After you've installed the libraries, attempt installing NRPE again and see if the binary generates appropriately this time.

Jesse