Munin

Munin is a server monitoring system:

http://munin-monitoring.org/

I found this software a good combination of simplicity and detail.

working method

• client-server application
• written in perl (see note)

mini:HOWTO

• configuration file for the server:

/etc/munin/munin.conf

• relevant lines:
  • includedir /etc/munin/munin-conf.d
  • htmldir /var/www/localhost/htdocs/munin
  • host declaration

[elwood]
   address 123.456.789.012
   use_node_name yes

• congiguration file for client:

/etc/munin/munin.conf

• and after you've changed it:

/etc/init.d/munin-node restart

• usually the munin cron is located in:

/etc/cron.d/munin

• to run manually the cron:

su - munin --shell=/bin/bash -c "/usr/bin/munin-cron "

• ...adding debug output

su - munin --shell=/bin/bash -c "/usr/bin/munin-cron  --debug"

(note) of chaos

• I started writing this article while debugging an error drawing the graphs. Doing it not constantly, while doing other things at home like cleaning and stuff. At first I copy-paste the commands, links and sentences I found thus I fill it and enrich it with more human content. So I wrote "munin is written i..." and I had no clue, so I came back to my house-work. while bedroom-cleaning it, I run into a thickness problem of a couple of centimeters