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I have a strange issue with munin on Ubuntu 16.04. All the graphs are ok but the network traffic and errors which are empty.

I see nothing in the logs about it, and running:

munin-run if_eth0

gives the output:

down.value 5382101121
up.value 79038417951

which seems ok to me. Running if_err_eth0 works too, but the graphs are like this: enter image description here

How can I fix this strange behaviour?

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1 Answer 1

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Ok, I finally found what the problem was. Munin was unable to determine the ethernet connection speed, and in the details of the traffic graph it was reporting:

Maximum speed is -1Mb/s.

I don't know if this issue is global to Ubuntu 16.04, but it was not here on the same cloud instance with prior versions of the OS.

To fix it, I just forced the link speed in the plugin's configuration (/etc/munin/plugin-conf.d/munin-node):

[if_*]
user root
env.speed 1000
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