nrpe stopped working after upgrade

[Andy Shellam]

The way NRPE works is:

1. check_nrpe sends the request to the NRPE server.
2. The NRPE server runs the command and captures any output sent to stdout
3. The NRPE server sends the captured output back to check_nrpe.

The error "No output returned from plugin" usually means that check_nrpe 
contacted the NRPE server OK, but the NRPE server did not return 
anything (i.e. point 2 above failed). 

 From experience, I've found the most popular reason is that the plugin 
on the remote side sent it's output to stderr (e.g. an error occurred 
running the plugin,) therefore check_nrpe reports no output being 
received, as it doesn't capture the error output stream.

What I'm suggesting is that you try to capture the output of the command 
on the remote side to a file, so you can see what's going on.
If the command succeeded in running when you've added "> 
/tmp/nrpe-test.txt 2>&1" to the end of the command definition in your 
nrpe config file, you'll get the full output (stdout and stderr) of the 
plugin in /tmp/nrpe-test.txt.  If there was no output, you'd still get 
an empty file.

As you're not getting a file created, I'd suggest either NRPE is 
misconfigured, or it couldn't execute the command correctly.
It also might help to check in /var/log/messages in case it logs a 
problem in there.

Andy.

Henrik Morsing wrote:
> On Sun, Apr 08, 2007 at 07:51:53PM +0100, Andy Shellam wrote:
>   
>> Another thing to try is adding "> /tmp/nrpe-test.txt 2>&1" to the end of 
>> your command in your NRPE config file.
>> Then when Nagios has tried to run the plugin, /tmp/nrpe-test.txt on the 
>> NRPE side will contain any output/errors etc.  That's actually how I 
>> found out about the TTY problem with sudo ;)
>>     
>
> Do you mean to nrpe_local.cfg on the remote host? Well, that's not really what the problem is. First of all, I just tried doing that but the file in /tmp never gets created? Even when I run it manually. Iøm not sure I understand what it is you're suggesting.
>
> Also, the problem is still with running check_nrpe, not the actual remote command. That works fine.
>
> Thanks
> Henrik
>
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