NRPE: No output returned from plugin error

[yuris]

openssl installed on all hosts, so it seems unlikely that this is the 
reason..

--
wbr,
yuris


yuris wrote:
> well,
>
> ./check_nrpe -H centos.host.com -n -c check_load
> CHECK_NRPE: Error receiving data from daemon
>
> and I see this in centos.host syslog "nrpe[22928]: Error: Could not 
> complete SSL handshake. 1" when issue command with "-n" option.
>
> --
> wbr,
> yuris
>
>
> Assaf Flatto wrote:
>   
>> 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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