Quick hack to get Munin to graph the cpu temperature.

First of all, install Munin and make sure it’s working.

Then follow these steps:

1. We’ll use cron to write the current temp to a log file. We do this because I wasn’t able to get Munin to directly execute the command (error: temp.value VCHI initialization failed)

Execute crontab -e and add this line (this has to be on one line):

*/5 * * * * /opt/vc/bin/vcgencmd measure_temp | cut -d “=” -f2 | cut -d “’” -f1 > /tmp/.temp

2. Go to /etc/munin/plugins/, and create a file temp, and add this content:

#!/bin/sh case $1 in config) cat <<‘EOM’ graph_category system graph_title Temperature graph_vlabel temp temp.label Celsius EOM exit 0;; esac echo -n “temp.value " cat /tmp/.temp

Save and exit the editor.

I’m not sure this is needed, but better do it: chmod +x temp

3. restart munin-node (/etc/init.d/munin-node restart)

4. test if it’s working:

# telnet localhost 4949 Trying 127.0.0.1… Connected to localhost. Escape character is ‘^]’.

munin node at industry.yeri.be

fetch temp temp.value 57.3 .

That’s it. Your munin daemon/host should now correctly graph the temperature.

Edit (8/2/2014): updated script can be found here.