Nagios Support Forum

Hi,

I am currently deploying the Nagios agent onto our Ubuntu 12.04 servers and on each one I am getting this NRPE: Unable to read output error in the Postfix service monitoring.

I know that the service name has to be entered correctly after having the same error when entering the wrong service name when running the wizard but as far as I know it is just called postfix in Ubuntu so I am scratching my my head about this one.

Any suggestions would be greatly appreciated and apologies if I am missing something obvious.

Thanks

Can you post the full command and service config for the check? Have you tried testing the check from the cli?
http://assets.nagios.com/downloads/nagi ... ios-XI.pdf

Hi Andy and thanks for your reply.

This is the command that is checking the Postfix service:

check_nrpe!check_init_service!-a 'postfix'

I will look into the plugins as well.

Cheers

Hello,

To grab what Abrist was asking for, please navigate to Configure > CCM > Services > 'click the blue diskette icon next to the name of this service in your list, then post the output here'. What you did give us though should be sufficient. Lets try this, open an ssh session to your XI server and log in as root, then run:
Can you also attach the nrpe.cfg of that remote host so we can verify your command definition there? Thanks!

Hi,

I get the following when running the command you provided:

NRPE: Unable to read output

I have attached the nrpe.cfg as requested.

If you are passing arguments with your command, you will need to change: to in the "nrpe.cfg" on the remote box and restart the daemon.

Hi,

I have made the changes you suggested but I'm still getting the same error.

All the other processes are being monitored OK it is just Postfix that is throwing this error.

Are the functioning checks using command arguments at all? Or is that all handled NRPE-side? If you did not compile with the --enable-command-args flag you will not be able to use arguments.

Hi,

Yes, all the other functioning service checks are using command arguments so I can't understand why the Postfix one isn't working correctly on any of the servers we are monitoring.

It seems it's working fine for me. Here's what I have on the client:

in the nrpe.cfg in the sudoers: On the client: Testing from the XI server: Hope this helps.