A few hours ago I installed MRTG on a Debian Lenny server. It worked fine for about 20-30 min, then the graphs stopped updating.
I tried restarting the snmpd service, daemonizing mrtg, undaemonizing mrtg, pretty much anything I could think of to no avail. 'ps aux | grep mrtg' shows that it is still running - which makes sense as the graphs keep updating with zero values.
I tried running 'snmpwalk -v1 localhost -c public' to see if snmp wasn't feeding the data properly, but it seems to come back okay. /var/log/mrtg/mrtg.log also has absolutely no errors.
The only thing that gets the graphs to update properly again is to do a system reboot, after which the updates work for 2-3 times (10-15min) and then stop again.
Here's what the graph looks like now
Any ideas? I googled the hell out of this but couldn't find any concrete ideas to try apart from running MRTG as a daemon.
aesop:~# uname -a
Linux aesop.<>.com 220.127.116.11-grsec-xxxx-grs-ipv4-32 #4 SMP Wed Feb 18 16:30:23 UTC 2009 i686 GNU/Linux
aesop:~# apt-cache madison mrtg
mrtg | 2.16.2-3 | http://mir1.ovh.net lenny/main Packages
mrtg | 2.16.2-3 | http://mir1.ovh.net lenny/main Sources
aesop:~# apt-cache madison snmpd
snmpd | 5.4.1~dfsg-12 | http://mir1.ovh.net lenny/main Packages
net-snmp | 5.4.1~dfsg-12 | http://mir1.ovh.net lenny/main Sources