Comment 24 for bug 30428

This is an easy fix. Please read the mrtg man pages, no need to make extra directories, etc.

       --lock-file filename
           Use an alternate lock-file (the default is to use the configura-
           tion-file appended with "_l").

Use this crontab ( my system is FreeBSD so changethe path to mrtg ):

*/5 * * * * /usr/local/bin/mrtg --lock-file /tmp/mrtg.lockfile /etc/mrtg_server.cfg > /var/log/mrtg/mrtg.log