NRPE: No output returned from plugin error

[Assaf Flatto]

yuris wrote:
> Hi all,
>
> I have this weird trouble with getting nrpe agents work. My nagios 
> server hosts on Debian box while agents on Debian and Centos (all 
> installed from official binary packages) and the problem is check_nrpe 
> always returns this "NRPE: No output returned from plugin" error when I 
> check NRPE on any Centos host and this is true with all plugins - all of 
> them does not return anything. I turned on debug at one Centos host but 
> still it does not show me anything, when I run from nagios host:
>
> ./check_nrpe -H centos.host.com -c check_load
>
> I always get "NRPE: Unable to read output" and there is nothing in 
> syslog at agent's host in spite of debug is on.
>
> My assumption was that command definitions on Centos host side use path 
> to plugins that is different from Debian, for example:
>
> command[check_load]="/usr/lib/nagios/plugins/check_load -w 15,10,5 -c 
> 30,25,20" [Debian host]
> command[check_load]="/usr/lib64/nagios/plugins/check_load -w 15,10,5 -c 
> 30,25,20" [Centos host]
>
> but I made symbolic link so that plugins could be called by the same 
> path - it didn't help. When I run command locally, all works just fine:
>
> su nrpe -c "/usr/lib/nagios/plugins/check_load -w 15,10,5 -c 30,25,20"
> OK - load average: 1.28, 0.97, 0.97|load1=1.280;15.000;30.000;0; 
> load5=0.970;10.000;25.000;0; load15=0.970;5.000;20.000;0;
>
> while from nagios server:
>
> ./check_nrpe -H centos.host.com -c check_load
> NRPE: Unable to read output
>
> The weird part of it is that all plugins work fine on debian hosts. 
> Nagios uses the same host, service and command definitions for all 
> monitored hosts (both debian and centos) and I really wonder what's 
> wrong with centos nrpe agents :/
>
> If anyone have any ideas, please try to help.
>
> P.S. I use Nagios server v.3 (from Debian lenny) and Nrpe agents 
> versions are the same on Debian and Centos (v.2.12).
>
>   
from first look it seems that one of your server has SSL installed on it 
and the other does not and nagios -by default - assumes ( command 
definitions) to use nrpe with ssl .

Try to execute the command on the CentOS hosts , but add "-n " after the 
host IP , and see if that will help .

Assaf

-- 
Never,Ever Cut A Deal With a Dragon 




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