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oetiker / mrtg

MRTG - Multi Router Traffic Grapher
http://www.mrtg.org
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Strange failure with mrtg-2.17.4 and rrdtool >1.4.8 #10

Closed UnixRonin closed 3 years ago

UnixRonin commented 6 years ago

I have encountered a peculiar problem with mrtg and recent versions of rrdtool on a Gentoo Linux system.

Background: I have two (and as far as I'm aware only two) applications that use rrdtool, mrtg and my own upswatch, a tool which uses rrdtool to monitor and graph UPS operating parameters via apcupsd.

If I allow rrdtool to update past release 1.4.8, mrtg still gathers traffic data, but fails to graph it, dying with the following error logged by Apache:

[Sun Mar 18 14:04:39.866602 2018] [cgi:error] [pid 19784:tid 140158795384576] [client 10.24.32.10:50654] AH01215: Undefined subroutine &RRDs::graph called at /var/www/mrtg/mrtg-rrd.cgi line 451.: /var/www/mrtg/mrtg-rrd.cgi, referer: https://www.caerllewys.net/mrtg2/

Yet upswatch continues to work perfectly all the way up to rrdtool-1.7.0. This implies the problem is in mrtg, not in rrdtool. But if the problem is in mrtg, then why does it depend on the rrdtool version?

oetiker commented 3 years ago

it is possible to compile librrd without graph support ... maybe this was the case here