AW: Socket Timeout

[Andreas Ericsson]

Thomas.Zimmer at oppenheim.de wrote:
> Hi Andreas,
> Many thanks for the solution of the timout-prob. Do you think the
> modification the socket receive buffers could cause undesireble consequences
> for the system nagios is running on?


The program enhancing the buffers will ofcourse consume more memory. On 
some systems this comes from the kernel's pre-allocated chunks which it 
is either expensive or impossible to grow. Since it's only one program 
and one socket though it shouldn't make much difference.


> Any security-related issues? 


Not with a sane implementation which most systems have these days. 
Ancient True64 had some problems, as did HPUX and UniCOS. To my 
knowledge this has been fixed though (except possibly UniCOS which I 
doubt you're running).


> Greetings, Thomas Zimmer
> 
> Thomas Zimmer
> Produktservice & Betrieb
> Betrieb & Support
> Sal. Oppenheim jr. & Cie., Frankfurt a. Main
> Mobil:     0177/ 540 70 56
> Internet: http://www.oppenheim.de
> E-Mail: thomas.zimmer at oppenheim.de
> 
> 
> 
> -----Ursprüngliche Nachricht-----
> Von: nagios-users-admin at lists.sourceforge.net
> [mailto:nagios-users-admin at lists.sourceforge.net] Im Auftrag von Andreas
> Ericsson
> Gesendet: Dienstag, 18. Oktober 2005 11:58
> An: PEYRE Julien
> Cc: nagios-users at lists.sourceforge.net
> Betreff: Re: [Nagios-users] Socket Timeout
> 
> 
> PEYRE Julien wrote:
> 
>>Hello everybody,
>>
>>I'm trying to use Nagios in order to survey our databases with custom 
>>plug-in. On Nagios browser, if I choose a host and I launch "Schedule 
>>an immediate check of all services on this host", I have all status 
>>for all services that take value " CHECK_NRPE: Socket Timeout after 10 
>>seconds".
>>
>>If I launch an immediate check service by service (one by one), it's 
>>OK, it functions.
>>
>>Any idea would be welcome !
>>
> 
> 
> You're most likely flooding the socket receive buffers in the kernel. 
> What systems are you seeing this on and how many checks are there to 
> run? Most systems have an accept(2) queue size of five, so above that 
> and you're in uncharted territory unless you fiddle with the 
> receive-buffers directly through fcntl(2) in which case it should be 
> possible to set it to some quite large value (see check_icmp.c on how to 
> do this).
> 

-- 
Andreas Ericsson                   andreas.ericsson at op5.se
OP5 AB                             www.op5.se
Tel: +46 8-230225                  Fax: +46 8-230231


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