CHECK_NRPE: Socket timeout after 10 seconds.

[Mark Young]

On Sep 2, 2008, at 9:44 AM, J. Bakshi wrote:

> J. Bakshi wrote:
>> Alex Dehaini wrote:
>>
>>> Dude,
>>>
>>> I am assisting with nagios not your firewall. Read your firewall  
>>> docs
>>> very well. Remember to always read the documentation carefully  
>>> before
>>> requesting for assistance that are already in the docs.
>>>
>>
>> The nrpe docs mentions abt the firewall rules which I have already  
>> used,
>> but no luck :-(
>>
>
> Not firewall; I have solved the problem by incresing time with -t

 From what you are describing I believe that this is a problem with  
your xinetd nrpe configuration.  I run into this problem a lot.  By  
default Xinet will only allow so many instances per second that if  
exceeded xinet will refuse connects for certain amount of time.   
Basically your remote server thinks that it is being DDoS.  Increasing  
the time is only covering a symptom.

You can change this globally or per service by adding these lines in  
ether /etc/xinetd.conf or /etc/xinetd.d/nrpe.  You can play with the  
exact numbers you need.  I believe the default is 50 connections a  
second.

# CPS where 100 connection per second with a timepout of 10 seconds if  
exceded.

# Max number of instances running

[myoung at vserve xinetd.d]# more nrpe
# default: on
# description: NRPE (Nagios Remote Plugin Executor)
service nrpe
{
        	flags           = REUSE
         socket_type     = stream
	port		= 5666
        	wait            = no
         user            = nagios
	group		= nagios
        	server          = /usr/local/nagios/bin/nrpe
         server_args     = -c /usr/local/nagios/etc/nrpe.cfg --inetd
        	log_on_failure  += USERID
         disable         = no
	only_from       = 127.0.0.1,IP.ADDRESS.OF.NAGIOS
	cps		= 100 10
	instances	= 300
}


Good luck!

Mark Young
___
Nagios Enterprises, LLC
Web:    www.nagios.com


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