Nagios Support Forum

I'm pulling temp/humidity data from a sensor connected to a Netbotz Rack Monitor 570. This was simple enough using a configuration wizard and both values are displayed correctly using OIDs.

1. How would I go about creating both a high and low alert for humidity levels?
2. Is this even possible using a single service?
3. Is it possible to show the warning/critical level markings for both high and low values on a single dashlet gauge?

I bounced between Nagios forums and Nagios Exchange last week digging around for an easy solution that would fit my needs. I couldn't find anything that would allow me to just plug in an OID and give me the results I need for humidity alerting/monitoring. I'm certainly open to a little work if it's required.

At this point, anything would be helpful. Links to plugins or previous discussion are appreciated. Thanks in advance.

Nagios Installed Version: 5.2.2

It seems like this plugin uses the "built in" thresholds in the system:

TEMP_OID = "PowerNet-MIB::emsProbeStatusProbeTemperature"
TEMP_HIGH_TRESH_OID = "PowerNet-MIB::emsProbeStatusProbeHighTempThresh"
TEMP_LOW_TRESH_OID = "PowerNet-MIB::emsProbeStatusProbeLowTempThresh"
TEMP_MAX_TRESH_OID = "PowerNet-MIB::emsProbeStatusProbeMaxTempThresh"
TEMP_MIN_TRESH_OID = "PowerNet-MIB::emsProbeStatusProbeMinTempThresh"

HUMIDITY_OID = "PowerNet-MIB::emsProbeStatusProbeHumidity"
HUMIDITY_HIGH_TRESH_OID = "PowerNet-MIB::emsProbeStatusProbeHighHumidityThresh"
HUMIDITY_LOW_TRESH_OID = "PowerNet-MIB::emsProbeStatusProbeLowHumidityThresh"
HUMIDITY_MAX_TRESH_OID = "PowerNet-MIB::emsProbeStatusProbeMaxHumidityThresh"
HUMIDITY_MIN_TRESH_OID = "PowerNet-MIB::emsProbeStatusProbeMinHumidityThresh"

I don't see an option to specify warning/critical thresholds/ranges from the CLI.

Thank you for the response. I tried that plugin earlier and quickly moved on after receiving the message 'UNKNOWN: Cannot interact with NetBotz SNMP Agent'. It's possible that I'm doing something wrong, but as you noted, the arguments are short and sweet. I'm not sure you can mess up ./script -H x.x.x.x -c public. If they had the knowledge, I imagine someone could substitute another MIB to match it up with their device.

Since I'm already using the OID for grabbing the values, would it be possible to just create a service with check_snmp? It looks like you can use multiple OIDs, so could I just check the same OID several times within the check using different levels of warnings and criticals for each?

Something like ./check_snmp -H x.x.x.x -c20:80 -C public

That's probably too simple and I honestly don't know how to write an alert that will alert for warn/crit with multiple thresholds. Would you need more than one service? I would like to be alerted as follows:

0 - CRIT - 20 - WARN - 40 - OK - 60 - WARN - 80 - CRIT - 100

I suppose I could write a single alert for each, one to alert for critical at 0 to 20, etc. But is there an easier way to write this within a single service, or maybe just two? An example would be greatly appreciated.

You could use a wrapper script that uses the check_snmp plugin. You take the output from that, and run it by a bunch of if statements. You have those if statements change the message and the way that it exits based on what your output is. Here is an example post I wrote awhile ago, I hope it may be of some use to you.

I appreciate the replies. I wish I had more time to create something custom. That certainly looks like what I need to do to get what I want.

For now I used a built in check and kept it simple.

$USER1$/check_snmp -H $HOSTADDRESS$ $ARG1$

-o .1.3.6.1.4.1.5528.100.4.1.2.1.8.3856353442 -C public -P 1 -l "HUMID" -u "PCT" -c20:80

I hope that helped you out at least. Is there anything else we can do for you, or would you like this thread locked?

It's good for now, I'm going to let this rest. Thanks again.