check snmp problem and cant find the reason

[Kelly Setzer]

> From: jgking at packetstorm.org
> 
> Ok i have 2 linux systems, one i test on and the other is where i deploy 
> after testing. On the test system everything works just fine. On the 
> production system nagios cannot get a return value from the snmp daemon.
> 
> 5. So as the nagios id i then run the libexec/check_snmp program passing 
> it the above information. It works as well
> 
> So what could be causing the nagios client to not be able to connect to 
> the snmpdaemon?
> 
> All im getting back on this box is "SNMP problem - No data recieved from 
> host "

I am having the same problem - intermittently.  I recently added SNMP
monitoring to a completely functional nagios installation.  I have
about 80 services that use check_snmp.  On two hosts, I see recurring
errors as above, "No data received from host".  We have 156 services
total that we are monitoring.

I've done extensive testing to prove to me that snmpget on the nagios
server functions correctly.  I also did some load testing against the
two problem hosts and was NEVER able to get snmpget to fail.

However, by putting a shell-script wrapper around snmpget and using that
to log all calls from check_snmp, I am seeing cases where check_snmp
*apparently* doesn't get any data back from snmpget.  I believe this
is an issue with check_snmp.

I have tried several versions of the net-snmp/ucd-snmp package on
both the nagios server and the affected hosts.  That had no effect.
I have tried both 1.3.0b2 and 1.3b1 of the nagios-plugins.  Persistently
"re-scheduling service checks" will cause this problem to disappear,
sometimes for several days at a stretch.

Kelly



-------------------------------------------------------
This SF.NET email is sponsored by:
SourceForge Enterprise Edition + IBM + LinuxWorld = Something 2 See!
http://www.vasoftware.com