No output returned from plug-in

Lars Stavholm stava at telcotec.se
Tue May 15 06:08:32 CEST 2007


Williams, John wrote:
> I am having an issue with a new nagios server where some of the plugins
> are showing “No output returned from plugin” on the nagios webpage. The
> check that is running is a command that is defined on the remote host in
> nrpe.cfg.

This usually indicates permission problems.

> I looked around the archives and didn’t find anything that would fix the
> problem that I am having.

It's a common enough problem so you should have found something.

> I am running Debian Linux, Apache2, and Nagios 1.4.
> 
> Each remote machine is running nrpe and as the user “nagios” I can
> manually run the check_nrpe –H hostname –c command and it works fine.
> It’s when I am running the command through the webpage that it doesn’t work.

When you run the check manually, do you run it as user "nagios"?
/Lars

> The new nagios server is replacing a nagios 1.3 server, which ran fine (
> the hardware is out of warranty which is why we are replacing it ).
> 
> Each remote host has the IP address of the new nagios server defined in
> nrpe.cfg and nrpe has been restarted on the remote hosts.
> 
> Doing a tail –f /var/log/nagios/nagios.log will show the command being
> executed, but no reply data.
> 
> Nagios was installed using the Debian “apt-get”, so it was a
> pre-packaged bundle from Debian.
> 
> All plugins have been installed.
> 
> On the backup nagios 1.4 server (I am using linux clustering) all checks
> work fine. I can’t find anything different between file ownership,
> permissions, etc… with the 1.4 server that is working and the 1.4 server
> that isn’t.
> 
> All checks are being done on the same subnet, so routing isn’t an issue.
> 
> Any help you can give would be greatly appreciated. If you need more
> info on my config I would be happy to post it.
> 
> Thanks in advance
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