[lm-sensors] How to get the OID of lm_sensors'value for SNMP

Virgil Gheorghiu virgilg at cs.uchicago.edu
Sat May 29 01:40:32 CEST 2010

Hi, Borat

> sorry to bother you again, i've find your post. http://lists.lm-sensors.org/pipermail/lm-sensors/2010-May/028535.html
> But with snmpwalk -v2c -c public printsrv LM-SENSORS-MIB::lmFanSensorsTable I got the error: LM-SENSORS-MIB::lmFanSensorsTable = No Such Object available on this agent at this OID
Yes, I got the same error when I upgraded our Debian unstable systems to snmp (libsnmp-base
I filed a (similar) bug with the package maintainer (581007), please see:

So I rolled my packages back to 5.4.1~dfsg-12 (snmp, snmpd, libsnmp-base) and will keep them there until they sort this out.
I suggest you ask the net-snmp list to fix this problem. The MIB that the lm-sensors people provide is clean and minimal; although
there's room for improvement, I believe it is not their problem that net-snmp broke this functionality aspect. Or maybe they're in the
process of fixing it already? (Someone correct me if I'm wrong)

Here are relevant SNMP configuration parameters that work with package versions I mentioned above:
root at client:~# cat /etc/snmp/snmpd.conf
# lines with v2c / v3 security stuff
# give access to sensors tree
view systemview included        .

root at client:~# cat /etc/sensors.conf
# proper per your motherboard

Daemons running: snmpd, sensord (optional)

root at nms-server:~# # snmpbulkwalk -v2c -cpublic client  LM-SENSORS-MIB::lmTempSensorsTable
LM-SENSORS-MIB::lmTempSensorsIndex.1 = INTEGER: 0
LM-SENSORS-MIB::lmTempSensorsIndex.2 = INTEGER: 1
LM-SENSORS-MIB::lmTempSensorsIndex.3 = INTEGER: 2
LM-SENSORS-MIB::lmTempSensorsIndex.4 = INTEGER: 3
LM-SENSORS-MIB::lmTempSensorsIndex.5 = INTEGER: 4
LM-SENSORS-MIB::lmTempSensorsDevice.1 = STRING: CPU0 Temp
LM-SENSORS-MIB::lmTempSensorsDevice.2 = STRING: CPU1 Temp
LM-SENSORS-MIB::lmTempSensorsDevice.3 = STRING: temp3
LM-SENSORS-MIB::lmTempSensorsDevice.4 = STRING: temp4
LM-SENSORS-MIB::lmTempSensorsDevice.5 = STRING: MB Temp
LM-SENSORS-MIB::lmTempSensorsValue.1 = Gauge32: 55000
LM-SENSORS-MIB::lmTempSensorsValue.2 = Gauge32: 58000
LM-SENSORS-MIB::lmTempSensorsValue.3 = Gauge32: 4294839296
LM-SENSORS-MIB::lmTempSensorsValue.4 = Gauge32: 4294839296
LM-SENSORS-MIB::lmTempSensorsValue.5 = Gauge32: 32000

One thing I noticed is that the walk returns parameters (and bogus values) I explicitly set to 'ignore' in my sensors.conf.
I'd love it if it wouldn't:
root at client:~# grep ignore /etc/sensors.conf 
        ignore in3
        ignore temp3
        ignore temp4
        ignore fan7
        ignore fan8
        ignore fan9
        ignore fan10

You can then build a grep script that gives you [param]:[value] pairs and dump them in an rrd file.

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