Nagios monitoring for ReadyNAS: snmp data not appearing

Question

I've put in all the Nagios settings to monitor this but my commands are timing out:

./check_snmp -H 10.100.0.20 -o READYNAS-MIB::volumeStatus.1 -C public -P 2c

I noticed that I don't have the MIB for the ReadyNAS's snmp. ReadyNAS publishes a text file with this information here:

http://wiki.comdivision.com/display/cdconstech/Nagios+Config+to+monitor+ReadyNAS+Devices

I'm using Ubuntu. I put this .txt file in /usr/share/snmp/. I suspect that isn't correct.

On my Netgear I have it set to use snmp "public" and allow my nagios server access:

http://i.imgur.com/SNMBl.png

When I run that check_snmp command it just times out. Any ideas on how to troubleshoot this? I'm something of a nagios and snmp noob. Thanks.

Answer 1

On Ubuntu, READYNAS-MIB.txt should go into /usr/share/snmp/mibs and not /usr/share/snmp

Then if you run

 snmptranslate -Td  READYNAS-MIB::volumeStatus.1

it should show you the definition of volumeStatus. If it doesn't work, try removing /usr/share/snmp/mibs/.index and trying again.

To see all of the SNMP data on the ReadyNAS that may be worth monitoring, run

snmpwalk -v1 -cpublic 10.100.0.20 .1 > somefile

the ".1" will give you everything the ReadyNAS has for SNMP OIDs.

Answer 2

The default search path for mibs probably doesn't include /usr/share/snmp, nor /usr/share/snmp/mibs, depending on which Ubuntu flavor you're dealing with.

I believe the "correct" place for any recent release would be /usr/share/mibs/site/, which should cause it to be auto-discovered by the snmp tools.

You should avoid using human-readable OID references with nagios, as a general rule; it is a performance hit, and is easy to break (as you've discovered).

Once you have the MIBs, and you discover which OIDs you're interested in, use snmptranslate, or add "-On" to snmpwalk/snmpget, to get the numeric OIDs. You could also find them via a MIB browser.

There are several existing plugins for checking ReadyNAS devices, on Nagios Exchange: http://exchange.nagios.org/directory/Plugins/Hardware/Storage-Systems/SAN-and-NAS

You might want to give one of those a try, instead of fighting with the stock check_snmp plugin, or re-inventing the wheel.