Friday, December 12, 2014

Help: Munin thinks it has nothing to do

So, setting up a centOS server, and getting Munin up & running.
No big deal, it should be done && done in less than 5 minutes nowadays, specially if it will be graphing only itself.
But, after the install (thru the EPEL repo) and starting the service, you access the page, and instead aof getting grafancy graphics, all you see is a lousy list of the files.
And then you start getting problem report emails that look like this:

[FATAL] There is nothing to do here, since there are no nodes with any plugins.\
Please refer to at\
 /usr/share/munin/munin-html line 40

Those come from the cronjob that actually runs Munin.
If you look on the file /var/log/munin/munin-update.log, you'll find something like this:

2014/12/11 04:25:01 [INFO]: Starting munin-update
2014/12/11 04:25:01 [INFO] starting work in 1101 for localhost/
2014/12/11 04:25:01 Failed to connect to node : Connection refused
2014/12/11 04:25:01 [ERROR] Munin::Master::UpdateWorker failed to connect to node
2014/12/11 04:25:01 [INFO] Reaping Munin::Master::UpdateWorker.  Exit value/signal: 20/0
2014/12/11 04:25:01 [INFO] No old data available for failed worker localhost;localhost.  This node will disappear from the html web page hierarchy
2014/12/11 04:25:01 [INFO]: Munin-update finished (0.02 sec)

The workaround?
Edit the file /etc/munin/munin.conf from this:

# a simple host tree
    use_node_name yes

to this:

# a simple host tree
    use_node_name yes

And then restart the service:

sudo /etc/init.d/munin-node restart

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