Nagios XI 5.6.6 Missing /var/lib/mrtg/

[tgriep]

When installing rrdcached on the server, it add an option to the MRTG config file which caused MRTG to fail.
Edit the /etc/mrtg/mrtg.cfg file and remove this line and save it.

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LibAdd: /opt/rrdtool-1.4.4/lib/perl/5.10.1

You may have to reinstall the rrdtool perl package by running

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yum reinstall rrdtool-perl

To test it, run this command

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LANG=C LC_ALL=C /usr/bin/mrtg /etc/mrtg/mrtg.cfg -debug=cfg,base,log

If you do not see this error

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ERROR: CFG Error in "libadd", file /etc/mrtg/mrtg.cfg line 0: /opt/rrdtool-1.4.4/lib/perl/5.10.1 is not the name of a directory

Wait for 20 minutes and see if the rrd files are created.

[dfmco]

That fixed it. Do we know how this line was added?

[tgriep]

If you installed a package called rrdcached, it updates the MRTG config file so it can cache the RRD files created by MRTG.
But, the change does not fully work with MRTG and causes it to fail.