No output returned from plug-in

[Lars Stavholm]

Williams, John wrote:
> The plugin doesn't fail when run manually:
> 
> newton2:/usr/lib/nagios/plugins# sudo -u nagios ./check_nrpe -H DWDEV -c
> disks_DWDEV
> All filesystems at less than 95% capacity.
> 
> It only fails to show output on the webpage.

I see, now that's tricky. I'm sorry, but I have no more ideas.
Maybe something's available in the environment when run interactively,
whereas when nagios runs the check in the background there's
something missing. Compare env's for the two cases maybe?

Sorry I couldn't be of more help.
/Lars

> -----Original Message-----
> From: Lars Stavholm [mailto:stava at telcotec.se] 
> Sent: Tuesday, May 15, 2007 9:52 AM
> To: Williams, John
> Cc: nagios-users at lists.sourceforge.net
> Subject: Re: [Nagios-users] No output returned from plug-in
> 
> I ment the failing check plugin,
> i.e show us the output from "sudo -u nagios check_...".
> /L
> 
> Williams, John wrote:
>> When running the check I use the following command:
>>
>>
>> sudo -u nagios -H nagios -v /etc/nagios/nagios.cfg
>>
>> and get the resulting output:
>>
>> newton2:/usr/sbin# sudo -u nagios -H nagios -v /etc/nagios/nagios.cfg
>>
>> Nagios 1.4
>> Copyright (c) 1999-2006 Ethan Galstad (nagios at nagios.org)
>> Last Modified: 05-03-2006
>> License: GPL
>>
>> Reading configuration data...
>>
>> Running pre-flight check on configuration data...
>>
>> Checking services...
>>         Checked 484 services.
>> Checking hosts...
>>         Checked 151 hosts.
>> Checking host groups...
>>         Checked 25 host groups.
>> Checking contacts...
>>         Checked 28 contacts.
>> Checking contact groups...
>>         Checked 26 contact groups.
>> Checking service escalations...
>>         Checked 0 service escalations.
>> Checking host group escalations...
>>         Checked 0 host group escalations.
>> Checking service dependencies...
>>         Checked 26 service dependencies.
>> Checking host escalations...
>>         Checked 0 host escalations.
>> Checking host dependencies...
>>         Checked 95 host dependencies.
>> Checking commands...
>>         Checked 145 commands.
>> Checking time periods...
>>         Checked 19 time periods.
>> Checking for circular paths between hosts...
>> Checking for circular service execution dependencies...
>> Checking global event handlers...
>> Checking obsessive compulsive service processor command...
>> Checking misc settings...
>>
>> Total Warnings: 0
>> Total Errors:   0
>>
>> Things look okay - No serious problems were detected during the
>> pre-flight check
>>
>>
>> I checked through the archives and the suggestions that I found didn't
>> fix the problem. I agree, it's probably a common problem that I am
>> having.
>>
>> I went back through my install of nagios and checked permissions
>> (against the install that is working) of the following:
>>
>> /etc/nagios (and sub directories)
>> /etc/nagios-plugins
>> /usr/share/nagios (and sub directories)
>> /usr/lib/nagios (and sub directories)
>> /usr/sbin/nagios
>> /usr/sbin/nrpe
>>
>> I also checked file sizes of the contents in the /etc/nagios directory
>> against the working server and they matched. I then went though, line
> by
>> line, the config files and they matched.
>>
>> I added the host names of the client to my /etc/host file (it was
>> already in dns) and that didn't help. I did the same thing on the
> client
>> machine with the server names. Same result.
>>
>> For each host defined in my services config file, not everything is
>> failing to report back. It seems like a only the checks that would be
>> defined in the nrpe.cfg file on the target machine. If it's just a
>> straight plugin check, then it appears to work. For example:
>>
>> On our netbackup server, the checks for ping and ssh work fine. The
>> custom commands for checking tape drive status doesn't. 
>>
>>
>> I also ensured that the package list that was installed on the working
>> server also matched the problem server.
>>
>> Thanks
>> -----Original Message-----
>> From: Lars Stavholm [mailto:stava at telcotec.se] 
>> Sent: Tuesday, May 15, 2007 12:09 AM
>> To: Williams, John
>> Cc: nagios-users at lists.sourceforge.net
>> Subject: Re: [Nagios-users] No output returned from plug-in
>>
>> 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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