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Paul Tomblin
Asked: 2010-12-01 08:18:34 +0800 CST

How to clean a garbage value in Munin

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After I rebooted one of my servers, Munin (which runs on another server) seems to have picked up some garbage response from it in the process of rebooting.

http://xcski.com/munin/xcski.com/linode.xcski.com-cpu.html

I would like to remove that garbage value, even if it means losing all the data for that node up to now. I tried removing the .rrd files in /var/lib/munin but all that did was remove the history from before the reboot. Is there a way to clean this up?

linux munin

2 Answers

  1. /var/lib/munin/hostname/* Should contain all the rdd files for that host.. If after deleting that you are still plotting garbage then maybe the munin-node on the offending machine needs to be restarted.

    You can check to see if the node is sending garbage by telneting into the node service 

    #replace 4949 with whatever port you are using.
telnet bad-node-ip 4949

    After you are connected enter

    fetch thenameoftheplugin

    You should see something like

    system_cpu.value 123 
user_cpu.value 123 
etc

    If you still see garbage then the node is still sending garbage so that would need to be inspected, not munin. (Start with the commands the script uses to output values to munin).

    For additional information regarding debugging there is some info on the munin wiki

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  2. Best Answer

    Thanks to the munin-users mailing list, I have discovered the script "removespikes" which can remove transient values out of your rrd files. It worked beautifully.

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