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[nagios@myucbdnagiapp01 libexec]$ ./check_nrpe -H localhost -c "rs_GetOSVersion"
Red Hat Enterprise Linux release 8.2 (Ootpa) x86_64 [myucbdnagiapp01] *NRPE v3.2.1*

[nagios@myucbdnagiapp01 libexec]$ ./check_nrpe -H localhost -c "rs_GetOSVersion" -a "linux"
CHECK_NRPE: Receive header underflow - only 0 bytes received (4 expected).

[nagios@myucbdnagiapp01 libexec]$ ./check_nrpe_v321r_rhel8 -H localhost -c "rs_GetOSVersion" -a "linux"
NRPE: Command 'rs_GetOSVersion!linux' not defined

[nagios@myucbdnagiapp01 libexec]$ ./check_nrpe_v321r_rhel7 -H localhost -c "rs_GetOSVersion" -a "linux"
NRPE: Command 'rs_GetOSVersion!linux' not defined

[nagios@myucbdnagiapp01 libexec]$ ./check_nrpe_v321r_rhel7 -H localhost -c "rs_GetOSVersion"
Red Hat Enterprise Linux release 8.2 (Ootpa) x86_64 [myucbdnagiapp01] *NRPE v3.2.1*

[nagios@myucbdnagiapp01 libexec]$ ./check_nrpe_v321r_rhel7 -H localhost -c "rs_GetOSVersion" -a linux
Red Hat Enterprise Linux release 8.2 (Ootpa) x86_64 [myucbdnagiapp01] *NRPE v3.2.1*

#############################################################################
#
# NRPE Config File V3.0.1
#############################################################################


log_facility=daemon
log_file=/usr/local/nagios/nrpe.log
debug=0
pid_file=/usr/local/nagios/var/nrpe.pid
server_port=5666
#listen_queue_size=5
nrpe_user=nagios
nrpe_group=nagios

allowed_hosts=127.0.0.1,::1

dont_blame_nrpe=1
allow_bash_command_substitution=0
command_timeout=60
connection_timeout=300

command[rs_GetOSVersion]=/usr/local/nagios/libexec/rs_GetOSVersion $ARG1$

ssax wrote:This usually occurs when you don't enable arguments during the compile of NRPE.

Did you install through this utility (it should do it for you)?

https://assets.nagios.com/downloads/nag ... _Agent.pdf

Or if you compiled from source, you'll need to do this:

Code: Select all

cd /tmp/nrpe-nrpe-4.0.3/
./configure --enable-command-args
make all

Taken from here:

https://support.nagios.com/kb/article.php?id=515#RHEL