I have configured

  • NAGIOS server on IP address AA.BB.CC.DD (Linux Fedora 20), and
  • Monitoring the host with IP address LL.MM.NN.OO (Linux Fedora 20).

I have configured NRPE to run on port # 15666 on both the machines, and configured iptables. I am accessing NAGIOS web interface securely over https (SSL) [e.g. (https://AA.BB.CC.DD/nagios)].

On the NAGIOS server, when I run the command, I can see the output:

sudo -u nagios /usr/lib64/nagios/plugins/check_nrpe -H LL.MM.NN.OO -p 15666 -c check_total_procs
PROCS OK: 114 processes

So, it appears like NRPE is configured correctly.

However, when I check the host/services from the browser (https://AA.BB.CC.DD/nagios), I get an error CHECK_NRPE: Socket timeout after 10 seconds.

Am I missing something?

Well, I have modelled my config files based on the examples in the book "Building a Monitoring Infrastructure with Nagios", and objecttricks.html on Sourceforge.

Here are the snippets from the config files anyways:

define command{
        command_name check_nrpe
        command_line $USER1$/check_nrpe -H $HOSTADDRESS$ -c $ARG1$


define service{
        use                     generic-service
        host_name               SystemTest
        service_description     Total Processes
        check_command           check_nrpe!check_total_procs

Remote host configuration:

/etc/nagios/nrpe.cfg has:

command[check_network_security]=/usr/lib64/nagios/plugins/check_procs -c 1:30 -C NetworkSecurity.bin
command[check_network_comm]=/usr/lib64/nagios/plugins/check_procs -c 1:30 -C NetworkCommunication.bin
command[check_ping]=/usr/lib64/nagios/plugins/check_ping -H $ARG1$ -w $ARG2$ -c $AGR3$ -p 5
  • 1
    We'll need a fair bit more than this, though your investigation's a good start (+1 from me). Could you paste into your question the relevant sections from the config files? The bit where that particular test is defined against that particular host, and the bit where the check_command referenced therein is defined, would be most handy. – MadHatter Jun 17 '14 at 8:52
  • I have edited my post. – user226638 Jun 17 '14 at 12:57

Since you decided to change the port that NRPE uses for some reason (the default is 5666), you have to change the command definition for check_nrpe to match.

So you'll need to add -p 15666 to the command_line, at the very least.

(If you plan to run NRPE on this alternate port on every host, you can safely add the hard-coded port to the command def. But if you don't intend to do this, you might want to define a new command called check_nrpe_port (or similar) that accepts the port as $ARG2$ and leave the original intact.)

  • Whoa! How could I miss this? :) A good catch indeed. I missed -p 15666 in commands.cfg file. – user226638 Jun 17 '14 at 13:12

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