Nagios: NRPE: Unable to read output

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Joined: Mon Sep 19, 2022 7:21 am

Nagios: NRPE: Unable to read output

Post by MonatalBrowink »

I have installed Nagios and NRPE plugins on the same server (CentOs 7).

The preinstalled services like check_disk work fine, but my manually intalled plugins always end up with following error:

/usr/local/nagios/libexec/check_nrpe -H localhost -c check_cpu -a 20 10
NRPE: Unable to read output

define service{
use local-service
host_name localhost
service_description CPU
check_command check_cpu!20!10
notifications_enabled 0

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

command[check_users]=/usr/local/nagios/libexec/check_users -w 5 -c 10
command[check_load]=/usr/local/nagios/libexec/check_load -w 15,10,5 -c 30,25,20
command[check_disk]=/usr/local/nagios/libexec/check_disk -w 20 -c 10
command[check_procs]=/usr/local/nagios/libexec/check_procs -w 30 -c 200
command[check_cpu]=/usr/local/nagios/libexec/ -w $ARG1$ -c $ARG2$
command[check_procs_cron]=/usr/local/nagios/libexec/check_procs -a cron
command[check_mem]=/usr/local/nagios/libexec/ -w $ARG1$ -c $ARG2$
Output messages.log

Nov 29 19:52:03 localhost xinetd[25346]: START: nrpe pid=25575 from=::ffff:
Nov 29 19:52:03 localhost nrpe[25575]: INFO: SSL/TLS initialized. All network traffic will be encrypted.
Nov 29 19:52:03 localhost xinetd[25346]: EXIT: nrpe status=0 pid=25575 duration=0(sec)
additional information:

Output of /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_args = -c /usr/local/nagios/etc/nrpe.cfg --inetd
log_on_failure += USERID
disable = no
only_from =
Output from netstat -at | grep nrpe:

tcp 0 0 localhost:51424 localhost:nrpe TIME_WAIT
tcp6 0 0 [::]:nrpe [::]:* LISTEN
Does anyone have a hint? Thanks
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