Nagios NRPE

[alceryes]

I'm trying to get NRPE checks going but I'm running into difficulties. We have Nagios (on Ubuntu) up and running and checking servers just fine.
The steps I've followed so far -

Installed NRPE plugin (and dependencies) on our Nagios server
Modified NSC.ini in the NSClient++ directory on the target server, allowing the NRPEListener.dll, changed the allow arguments part under [NRPE], and added check_adhealth=C:\Program Files\NSClient++\scripts\Check_AD.exe to the [NRPE Client Handlers] section
Put the Check_AD.exe in the proper scripts folder
Added this to commands.cfg:
define command{
command_name check_nrpe
command_line /$USER1$/check_nrpe -n -H $HOSTADDRESS$ -c $ARG1$
}
Added this to windows.cfg
define service{
use generic-service
host_name <server name>
service_description Check AD Health
check_command check_nrpe!check_adhealth
}
Restarted nagios services and NSClient++ service on target server

Getting error "CHECK_NRPE: Error receiving data from daemon." in Nagios

...I'm not sure what else needs to be done as there is a plethora of different instructions on the WWW. Do I need to install an NRPE program on the windows server? Also is there a way to test whether NRPE is installed correctly on the Nagios server?

TIA!

[agriffin]

Did you add your Nagios server's IP address to the allowed hosts in NSC.ini?

[alceryes]

Yes, the allowed hosts line is there.
We've had Nagios monitoring this server for a while now. It's just the check_adhealth NRPE part that isn't working.

[slansing]

Could you please show how you are entering the check into the Nagios terminal to test it?

[agriffin]

Did you define check_adhealth as an NRPE command on the remote host?

[alceryes]

slansing - I am not testing manually (not sure how). I have the check defined in the Nagios commands.cfg and am trying to check a server listed in the windows.cfg. Those two commands are in my original post. If you could tell me how to manually test that'd be great, thx!

agriffin - Are you referring to the check_adhealth=C:\Program Files\NSClient++\scripts\Check_AD.exe in the NSC.ini or the commands.cfg entry?


Thanks for your help guys!

[slansing]

It seems as if the daemon is not connecting properly to Nagios. Under etc/xinetd.d/nrpe make sure that under USER, it is set as nagios

Code: Select all

user              =nagios

and that only_from is set to your Nagios server's IP

Code: Select all

only from       =your.nagios.ip.address

Assuming NSClient++ is set up properly on the Windows host's side, you can view log messages from the INSTALLDIRECTORY/nsclient.txt

Once here it is easy to see if the connection is being disrupted on the Windows side, or if it does not show up at all, the Nagios side.