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On Centos7, following nrpe plugin install steps, when testing the connection between the Nagios server and the remote agent, I got this error...

/usr/local/nagios/libexec/check_nrpe -H 192.168.50.5
CHECK_NRPE: Error - Could not connect to 192.168.50.5: Connection reset by peer

In /etc/xinetd.d/nrpe, I added the Nagios server's IP address to the only_from field.

# default: off
# description: NRPE (Nagios Remote Plugin Executor)
service nrpe
{
    disable         = no
    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
    only_from       = 127.0.0.1 ::1 {server_IP}
    log_on_success  =
}

I then restarted the xinetd service; however, upon checking the service status this error log message appeared...

Aug 09 09:32:21 localhost.localdomain xinetd[1448]: bind failed (Address already in use (errno = 98)). service = nrpe
Aug 09 09:32:21 localhost.localdomain xinetd[1448]: Service nrpe failed to start and is deactivated.
Michael
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1 Answers1

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The solution was to not only to include the server IP in /etc/xinetd.d/nrpe, but also to stop the nrpe service before restarting the xinetd service.

systemctl stop nrpe
systemctl restart xinetd

It seems restarting xinetd on its own failed to load the nrpe service because it the ports conflicted with the existing nrpe service.

Michael
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