NRPE: No output returned from plugin error

[Assaf Flatto]

Assaf Flatto wrote:
> 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
>
>   
Clarification :

./check_nrpe -H centos.host.com -n -c check_load


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