Hi Jim.
Mohr James wrote:
In order to record performance data, we have a construct that looks like
this:
- Nagios starts an NRPE job on another machine which starts a perl
script on a Windows 2003 machine
- the perl script uses the snmpget command from net-snmp 5.2.1 to read a
single value from a remote machine.
- The value is set in the perl script simply by $value=`$command`. (I am
not using the SNMP perl modules)
- The OID .1.3.6.1.4.1.1.1.101.1 is defined like this in snmpd.conf:
exec .1.3.6.1.4.1.1.1 /usr/bin/perl /opt/elaxy/bin/get_cpu_usage.pl
- This value is then written to a MS SQL Database using osql.
What is happening is that I see dozens of snmpget.exe programms running
(occassionally a couple of perl.exe processes). Unfortunately, I see no
way of figuring out to where these processes are connected, so I cannot
tell if there are specific machine causing the problems. Using netstat,
I do see a number of connections to the MS SQL database in TIMEWAIT.
However, since we are checking a couple of dozens machines, this is not
surprising.
The Nagios is reporting both "CHECK_NRPE: Socket timeout after 10
seconds." and "connection refused". Obviously this could be a purely
Nagios problem, however, as far as I can see it seems to be behaving
correctly. Plus, we have the dozens of snmpget processes that do not go
away.
Do the snmpget.exe commands eventually disappear?
I suspect the timeouts are because snmpget is taking too long to
respond, probably because of a bad community string. The agent won't
respond with a 'wrong community string'. The client just keeps trying
until the timeout occurs. I'm not sure about the "connection refused"
errors.
The default timeout for snmpget (and other commands) is 1 second, and
the default retries is 5 (man snmpcmd). Try reducing the retries to 2
using '-r 2'.
Snmpget errors are sent to STDERR. To include STDERR in the result, use
$value=`$command 2>&1`;
If you want to handle the errors by exit code, you can capture it from
the command using:
$value=`$command`;
$errorlevel = $? >> 8;
Alex
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