Nagios Support Forum

Posted: **Mon May 29, 2017 3:02 pm**

Hi everyone
I have a problem and I'm hoping someone has a quick fix.
Checking SNMP values in NagiosXI and we noticed all the ones that are returned as Counter64 are not being graphed correctly by RRD.
Looking at the output from check_snmp with a -v to see what it's doing, it adds a "c" to the value that isn't there with an snmpget

/usr/local/nagios/libexec/check_snmp -H <servername>-o 1.3.6.1.4.1.1230.2.7.2.5.1.0 -C <snmpcomm> -P 2c -l "CPU" -w 70 -c 90 -v
/usr/bin/snmpget -Le -t 1 -r 5 -m '' -v 2c [authpriv] <servername>:161 1.3.6.1.4.1.1230.2.7.2.5.1.0
iso.3.6.1.4.1.1230.2.7.2.5.1.0 = Counter64: 1
SNMP OK - CPU 1 | 'CPU'=1c;70;90;

Anyone know why it's adding a "c" there? It breaks all the RRD graphs.

any ideas? This doesn't happen with the 32 bit counters. I've seen a few other threads but no-one seems to address the little c.

It's a Centos 6.8 system 64-bit running Nagios XI 5.4.4

(also, any idea why I can't post to the XI forum?)

Posted: **Tue May 30, 2017 9:02 am**

what version of check_snmp are you running?

Posted: **Tue May 30, 2017 11:00 am**

Also, you should be able to post to the XI forums, just not the Customer section. Also note that your first two posts need to be approved by a moderator.

Posted: **Tue May 30, 2017 11:53 am**

Thanks tacolover101 for reply so quickly.

The version is v.2.0.3

/usr/local/nagios/libexec/check_snmp --version
check_snmp v2.0.3 (nagios-plugins 2.0.3)

Is there a newer one?

(@ tmcdonald - thanks, I'll try that next time)

Posted: **Tue May 30, 2017 2:22 pm**

There's likely old data in the current RRD that's referencing a '% usage' for the UOM. See this github issue for a better explanation:
https://github.com/nagios-plugins/nagio ... issues/102

I think Counter64 will evaluate to c for the UOM when gathered by check_snmp. See here:
https://github.com/nagios-plugins/nagio ... nmp.c#L431

Code: Select all

else if (strstr (response, "Counter64: ")) {
			show = strstr (response, "Counter64: ") + 11;
			is_counter=1;
			if(!calculate_rate)
				strcpy(type, "c");
		}

Whether or not that is a correct thing to do, I have no idea. But that is appears to be what's happening and why the c shows up.

Is creating a fresh RRD an option? I would imagine the problem would be fixed if you started with a fresh RRD for the service check.

Posted: **Tue May 30, 2017 3:47 pm**

Can you view the Customer Forums?
If so, take a look at this post for creating a template in XI to convert the counter output from the check_snmp plugin to a gauge so it will format the data correctly for the graphs.
https://support.nagios.com/forum/viewto ... 65#p146465
Let me know if you have any questions.

Posted: **Wed May 31, 2017 7:59 am**

Thank you mcapra.
Those articles are fab - it all makes sense now !

I did delete the RRD data file nad let it start filling again - no change.
I think the easiest thing would be to wrap check_snmp with a bash file and remove the 'c'

@ tgriep - No, it seems I'm not authorized to read that but as I know what's causing the little c, I can handle it.

thanks guys

really appreciated.

Posted: **Wed May 31, 2017 10:45 am**

Creating a script to remove the counter "c" for the performance output would work as well.
Let us know if you need any further help on this.

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