Nagios Support Forum

I upgraded to 5.8.3 this week and after everything going red things went normal after an hour or so.

After that I added a router via the whizard and everything looked normal.
When after an hour the rrd files were still missing I had a look and decided to throw everything out and do it again.
Same result. No rrd Files were not created however long I waited.

So I had a look at mrtg.
I ran :
Had a look at the CFG file and yes there was a definition at line 199 and a another file 178.188.103.138_5.cfg with a duplicate definition.
OK, I decided to rename the file to *.cfg2 and ran the check again and all hell broke loose.
It started with:
2021-04-09 09:10:26: WARNING: Expected a number but got 'noSuchInstance'
Then pages of
SNMPGET Problem for
finishing with
2021-04-09 09:11:17: ERROR: Target[10.27.27.1_47][_OUT_] ' $target->[438]{$mode} ' did not eval into defined data

So I thought I broke something and renamed the file back to cfg and got the same error as before.

Then I looked at the web interface and the rrd files were not missing any more!

I'm scratching my head. Can anyone bring some light into this?

That first error was a show stopper which causes MRTG to stop processing, hence no RRDs. The second error you are listing is not a show stopper and MRTG will continue on and should create the RRDs.

Please PM me the broken .cfg file from /etc/mrtg/conf.d if you still have it.

Thanks for looking into this.

It's a relief to know that after all it's working.
Was what I did OK after all?

I can't tell from the configs what was actually broken, did you have a duplicate file or was there a duplicate section in the original config you changed? If it was a duplicate file, did you add the same switch two different times with different names? (like once with IP and once with DNS name?)

OK, that's the most plausible explaination. Sometimes the router or switch has some issue with the SNMP configuration and then I will try a few times. I usually then delete all the cfg files but it has happened before that I forgot.
Thanks! I'll leave it there.

If you see that again, let me know. I tried replicating it by adding the same switch with a different name and I was unable to replicate the duplication of the file.

Do you see any updates for the Network Switch / Router Wizard in Admin > Manage Config Wizards > Check for Updates? What version is listed next to yours?