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<p>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.</p>
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<p>I have never set up mrtg as a daemon and not sure how to achieve the same results as with crontab.</p>
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<p>What has changes in the later version of perl that wasn't in fedora 22 where I didn't have this problem</p>
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<p>Any help setting it up to run as a daemon or a cure for the error would help please.</p>
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<p>I'm not a Linux expert nor do I write perl, I just install and use</p>
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<p>Nick<br>
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<div id="x_divRplyFwdMsg" dir="ltr"><font color="#000000" face="Calibri, sans-serif" style="font-size: 11pt;"><b>From:</b> mrtg <mrtg-bounces+np121=hotmail.com@lists.oetiker.ch> on behalf of Niall O'Reilly <niall.oreilly@ucd.ie><br>
<b>Sent:</b> Tuesday, January 3, 2017 3:41 PM<br>
<b>To:</b> mrtg@lists.oetiker.ch<br>
<b>Subject:</b> Re: [mrtg] SNMP_Session error</font>
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<div class="PlainText">On 2 Jan 2017, at 11:33, Nick Price wrote:<br>
<br>
> HI All<br>
><br>
> I have just install fedora 25 with all the updates for it and perl to <br>
> latest versions<br>
><br>
> I installed mrtg (2.17.4) and when I run it I get in the crontab mail <br>
> box<br>
><br>
> Subroutine SNMP_Session::pack_sockaddr_in6 redefined at <br>
> /usr/share/perl5/vendor_perl/Exporter.pm line 66.<br>
> at /usr/local/mrtg-2/bin/../lib/mrtg2/SNMP_Session.pm line 149.<br>
> Subroutine SNMP_Session::unpack_sockaddr_in6 redefined at <br>
> /usr/share/perl5/vendor_perl/Exporter.pm line 66.<br>
> at /usr/local/mrtg-2/bin/../lib/mrtg2/SNMP_Session.pm line 149.<br>
> Subroutine SNMPv1_Session::pack_sockaddr_in6 redefined at <br>
> /usr/share/perl5/vendor_perl/Exporter.pm line 66.<br>
> at /usr/local/mrtg-2/bin/../lib/mrtg2/SNMP_Session.pm line 604.<br>
> Subroutine SNMPv1_Session::unpack_sockaddr_in6 redefined at <br>
> /usr/share/perl5/vendor_perl/Exporter.pm line 66.<br>
> at /usr/local/mrtg-2/bin/../lib/mrtg2/SNMP_Session.pm line 604.<br>
><br>
> I have copied the SNMP_Sessions.pm from mrtg folder to the perl folder <br>
> and I still get this.<br>
><br>
> My last install of fedora was ver 22 and doing this cured it this time <br>
> it hasn't<br>
><br>
> Any ideas as this is flooding the mailbox every 5 minutes<br>
<br>
Since you ask ...<br>
<br>
Whenever I've seen the kind of messages you've shown above, they've <br>
been fallout<br>
from sloppy initialization code in one or a couple of Perl modules <br>
resulting in<br>
repeated definitions of the same subroutine. For me, there were two <br>
reasons for<br>
this to be inconsequential; first: any subsequent code re-definition <br>
seemed to be<br>
compatible with the original one, so the application just worked; <br>
second: I always<br>
used to run MRTG in daemon mode in order to avoid the repeated <br>
startup overhead<br>
involved in using cron to launch each sampling run.<br>
<br>
You don't say whether MRTG is otherwise working correctly for you, so <br>
I don't<br>
know whether the re-definitions have any other effect than flooding <br>
your e-mail.<br>
<br>
If reducing the noise is all you need to do, three options occur to <br>
me, of which<br>
tracking down the root of the problem and eliminating the <br>
redefinitions is the<br>
"most correct", but likely the most troublesome. Moreover, this <br>
option may be<br>
subverted by any future upgrade of one or other of the collection of <br>
packages<br>
on which MRTG depends.<br>
<br>
MRTG's daemon mode will eliminate repeated startup of MRTG, and so <br>
avoid<br>
repeated emission of startup-time warnings. You'll need to configure <br>
daemon<br>
mode in your MRTG configuration file, and provide or obtain a <br>
suitable init<br>
script or systemd configuration for starting and stopping the MRTG <br>
daemon.<br>
<br>
Another approach, which I've used on occasion for some other <br>
application, is<br>
to invoke a wrapper script from cron; this might redirect error <br>
output to a<br>
temporary file, somehow check for a "real" failure, and only generate <br>
output<br>
for cron to send on by mail in case such a failure occurred.<br>
<br>
I'ld happily let you have the scripts I used to use in a previous job <br>
for each<br>
of these approaches, but have some connectivity trouble just now and <br>
so am<br>
without the necessary access.<br>
<br>
I hope this is of some help.<br>
<br>
Best regards,<br>
Niall O'Reilly<br>
<br>
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