AW: Socket Timeout

[Thomas.Zimmer at oppenheim.de]

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? Any security-related issues? 
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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