[mrtg] SNMP_Session error

Niall O'Reilly niall.oreilly at ucd.ie
Tue Jan 3 17:55:30 CET 2017

On 3 Jan 2017, at 15:17, Nick Price wrote:

> I use contrab because the output of every device is sent to a 
> different folder, so that the owner of that device is the only person 
> (except mrtgadmin) that can view it.

   I guess you're specifying the folder in the MRTG configuration file.
   If so, you can continue to do this in the same way.

   Do you use a single configuration file, or a separate one for each 
   or some other approach?

> I have never set up mrtg as a daemon and not sure how to achieve the 
> same results as with crontab.

   It's explained in the section headed "RunAsDaemon" in the 
configuration reference
   (http://oss.oetiker.ch/mrtg/doc/mrtg-reference.en.html).  The 
'Target' sections
   can remain unchanged.

> What has changes in the later version of perl that wasn't in fedora 22 
> where I didn't have this problem

   I can't be sure, as I'm not currently running any OS from the RedHat 
   (RHEL, CentOS, Fedora).  I have only Debian/Ubuntu and FreeBSD.  I 
   that a Perl module has been installed in two places and references to 
   are somehow (either explicitly or implicitly) being made by MRTG.  
This can
   come about through an accidental interaction between your approach to 
   the packages involved and the release-engineering practice of the 
   and distribution developers.  Unfortunately, there is a risk of such 
   interaction at any version transition; I'm not sure it's useful to 
ask what
   has changed at this particular milestone.

> Any help setting it up to run as a daemon or a cure for the error 
> would help please.

   If you have just one configuration file and a corresponding single 
   entry, the transition to daemon mode is fairly simple.  You just need 
   obtain and install a starter script and follow the instructions for

> I'm not a Linux expert nor do I write perl, I just install and use

   I understand. 8-)

   Best regards,
   Niall O'Reilly

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