Question about NEB
Andreas Ericsson
ae at op5.se
Fri Oct 21 15:57:32 CEST 2005
Hendrik Baecker wrote:
> Hi,
>
> OCSP negative.
>
> obsess_over_services=0
> #ocsp_command=somecommand
>
> Since, at first step, I want only to log the things that nrpe must have,
> in my nagios.log (which you can see in my last post) there is no single
> executed nsca (at the moment) just logging...
>
> I am sorry, but I don't understood your second part...
> I am not quiet family with neb and c-coding... just figguring out what
> can be done and learning...
>
> I thought, that my "neb_register_callback" tells the Nagios Core, that
> my module want to have service_check_data and that the core should call
> my module function "nsca_neb_handle_data".
>
> AFAIR, there is no way for my module to tell the core, that I just want
> to have service_data after the check... or am I missing something?
>
There isn't, but you're missing something. Check the type of the
callback struct. It's supposed to equal the proper *_PROCESSED macro in
broker.h.
> " and AFAIR it should segfault if you try to use the plugin output
> before the check is run. "
>
> I think, please correct me:
>
> 1. Nagios-Core executes a service check.
> 2. Nagios-Core reaper gets the result.
> 3. Nagios-Core gives callback to my module and fills out the struct
> nebstruct_service_check_data which my mods just reading out and plays with.
>
0: core tells modules it's time to run a check
1: core runs the check
2: reaper reaps (it always does...)
3: core calls module with the completed check result
> When I am missing something in the logic, please tell me and I will go
> back to my attic for study the source and come back with more (hopefully
> better) ideas.
>
Since you're mentioning it, you might want to just add a callback for a
service check and then rely on the fact that Nagios passes the proper
value rather than adding the switch() case thingie.
> Regards
> Hendrik
>
> Andreas Ericsson schrieb:
>
>> Hendrik Baecker wrote:
>>
>>> Hi List,
>>>
>>> now I've changed some code from Ethan's helloworld.c NEB to give me
>>> NEB Callbacks from Nagios Core.
>>>
>>> I've registered a callback for Service Check data like this:
>>>
>>>
>>> neb_register_callback(NEBCALLBACK_SERVICE_CHECK_DATA,nsca_neb_module_handle,0,nsca_neb_handle_data);
>>>
>>>
>>> and I am processing this Service Checkdata just in that way, that I
>>> want to see them in the log:
>>>
>>> ###
>>>
>>> case NEBCALLBACK_SERVICE_CHECK_DATA:
>>> if((scdata=(nebstruct_service_check_data *)data)){
>>>
>>> snprintf(temp_buffer,sizeof(temp_buffer)-1,"nsca_neb:%s\t%s\t%d\t%s",(scdata->host_name),
>>>
>>> (scdata->service_description),
>>> (scdata->return_code), (scdata->output));
>>> temp_buffer[sizeof(temp_buffer)-1]='\x0';
>>>
>>> write_to_all_logs(temp_buffer,NSLOG_INFO_MESSAGE);
>>> }
>>> break;
>>>
>>> .....
>>>
>>> ###
>>>
>>> I am a little confused, cause I am getting two (different) Log
>>> entries for each service check!
>>>
>>> Log-Output:
>>>
>>> [1129892835] nsca_neb:Nagios_Slave Disk /usr 0 DISK
>>> OK - free space: /usr 3425 MB (57%):
>>> [1129892836] nsca_neb:Nagios_Slave Disk /usr 0 DISK
>>> OK - free space: /usr 3425 MB (57%):
>>> [1129892854] nsca_neb:Nagios_Master Disk /var 0 DISK
>>> OK - free space: /var 2865 MB (57%):
>>> [1129892855] nsca_neb:Nagios_Master Disk /var 0 DISK
>>> OK - free space: /var 2865 MB (57%):
>>>
>>> On the other side I have perfdata enabled and just see one entry for
>>> each check.
>>>
>>> Can anyone explain?
>>>
>>> Is it a feature? Is it a bug?
>>>
>>
>> I think you've still got the ocsp-command (or oscp or something)
>> enabled, so that the Nagios core and the module are both running
>> send_nsca.
>>
>> You also need to watch out for Nagios calling the module twice for
>> each check it does. Once before and once after. This isn't likely to
>> be what you're seeing though, because the two entries that are
>> temporally close to each other have identical plugin output and AFAIR
>> it should segfault if you try to use the plugin output before the
>> check is run.
>>
>
>
--
Andreas Ericsson andreas.ericsson at op5.se
OP5 AB www.op5.se
Tel: +46 8-230225 Fax: +46 8-230231
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