today at 02:20 I noticed that suddenly Munin stopped updating its graphs. It is not showing blank data, the whole graphs are not being updated anymore.

I run CentOs 5.7 (64) and ive installed Munin via yum. All was working, till 02:20.

First thing I did was restart Munin: service munin-node restart.

It restarted without problems or errors, but it still didn't update the graphs.

So I checked out all the log files in: /var/log/munin and apart from munin-node.log non of the files were updated since 02:20.

All that was added to munin-node.log was:

2011/12/06-02:57:19 Server closing! Process Backgrounded 2011/12/06-02:57:20 Munin::Node::Server (type Net::Server::Fork) starting! pid(16603) Using default listen value of 128 Binding to TCP port 4949 on host Setting gid to "0 0"

On every restart I tried after the same message showed up.

I am really clueless to why Munin stopped working all the sudden. Any idea what I can try?

  • Is the crontab file still there (/etc/cron.d/munin)? Is cron still running? What happens on that host when you do telnet localhost 4949 and say list? Could you update your question with some of this information? – MadHatter supports Monica Dec 6 '11 at 9:50

Make sure that the user which munin is running as has enough permisison to write to .rrd, .png, .html files. There is a question on the Munin FAQ.

  • Ive removed all the .rrd files, and the .html files, restarted it again, and eventually it started working again. – Mr.Boon Dec 6 '11 at 12:17

I once had this problem when one of my servers restarted, runing the command munin-check helped me realize the problem had to do with folder permissions.

Note: Even though I already had a folder /var/www/html/munin/web/monitoring and it has correct permissions set, munin-check complained about not finding that folder, I guess that's what the "this script may be buggy" warning means.

  • You can also run this with the option "--fix-permissions" – Rob Jun 18 '15 at 9:41

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