Change SNMP data

[csayre]

Hello,

I am having a problem configuring snmp to monitor a UPS. The monitoring works, but it displays data improperly. For example, SNMP OK - Input Voltage 1227 Volts should be 122.7 Volts.

Is there any way to fix this?

[hsmith]

If you check it from the command line, is the value correct?

[csayre]

If you check it from the command line, is the value correct?

No it is returning 1225

[gormank]

So you're fetching it w/ snmpget? I'd look into adding the decimal, or lopping off the last digit and verifying the value is greater than 2 digits, 100 or greater. Nagios receives what is sent or pulled from the SNMP system, it doesn't change the data.

More info's needed on what script, language, etc. is pulling the data.

[rkennedy]

Thanks @gormank!

As @gormank mentioned - please post the script that you're using to check.

[csayre]

I am using nagios xi currently under an evaluation license. The command that I am using is check_xi_service_snmp.

Here is the test output.

COMMAND: /usr/local/nagios/libexec/check_snmp -H 10.2.50.251 -o 1.3.6.1.4.1.318.1.1.1.2.3.4.0 -C snmpstring -P 1 -l "Battery Actual Voltage" -u "V DC" -m powernet417.mib -w @682.5:882.5 -c @0:682.5
OUTPUT: SNMP OK - Battery Actual Voltage 1364 V DC | 'Battery Actual Voltage'=1364V DC;882;682;

[jolson]

I think that the best way to approach this likely involves a simple wrapper script. You'll have to make your own script and implement it as a new plugin in XI - example:

Code: Select all

#!/bin/bash

output=$(/usr/local/nagios/libexec/check_snmp -H 10.2.50.251 -o 1.3.6.1.4.1.318.1.1.1.2.3.4.0 -C snmpstring -P 1 -l "Battery Actual Voltage" -u "V DC" -m powernet417.mib -w @682.5:882.5 -c @0:682.5)
exit=$?

if [ "$exit" == 0 ]
then
        output2=$(echo "$output" | sed "s/./\.&/45")
        output3=$(echo "$output2" | sed "s/./\.&/83")
        echo "$output3"
        exit 0
elif [ "$exit" == 1 ]
then
        echo "$output"
        exit 1
elif [ "$exit" == 2 ]
then
        echo "$output"
        exit 2
elif [ "$exit" == 3 ]
then
        echo "$output"
        exit 3
fi

I wrote this script quickly, so it's likely riddled with things that could be improved - but hopefully it serves the purpose of demonstration. If you can modify the standard output, you can modify how Nagios interprets the results.

[tgriep]

Do you want to check the input voltage to your UPS or the battery voltage, or both?
What OID are you using to monitor the input voltage?
Can you run the following and post the output?

Code: Select all

/usr/local/nagios/libexec/check_snmp -H 10.2.50.251 -o 1.3.6.1.4.1.318.1.1.1.3.3.1.0 -C snmpstring -P 1 -m powernet417.mib

Can you upload the MIB file so we can review it?

[csayre]

Do you want to check the input voltage to your UPS or the battery voltage, or both?
Both

What OID are you using to monitor the input voltage?
1.3.6.1.4.1.318.1.1.1.3.3.1.0

Can you run the following and post the output?
SNMP OK - 1237 | iso 3.6.1.4.1.318.1.1.1.3.3.1.0=1237

https://dl.dropboxusercontent.com/u/944 ... net417.mib

[rkennedy]

Did you try @jolson's script? It should work for you.