Adding Munin to Mercury

Posted by kcoop on January 31, 2010 at 7:39pm

I have seen Munin mentioned as a desirable component in Mercury, and I'd like to add my vote. I've found it a really useful diagnostic tool.

I just went through the process of installing it using this tutorial: http://www.debuntu.org/how-to-monitoring-a-server-with-munin

Very straightforward. The only changes I needed to make where in the VirtualHost configuration for the monitoring site - I had to a) change the *:80 to *:8080 to accommodate Varnish, and b) use AuthUserFile rather than AuthDigestFile.

Comments

Adding Varnish plugins to Munin

Posted by kcoop on March 29, 2010 at 9:35pm

I just put up Munin on my karmic server, and added Varnish monitoring to it. Nice not to be flying blind, and to have a history of the site.

First, I followed the instructions above. Then I went to muninexchange and grabbed several varnish plugins. Installing them was straightforward. Here's the example for varnish_allocated, using the Download link from muninexchange.

cd /usr/share/munin/plugins
sudo wget http://muninexchange.projects.linpro.no/download.php?phid=220 -O varnish_allocated
sudo chmod +x varnish_allocated
sudo ln -s varnish_allocated /etc/munin/plugins/varnish_allocated
sudo munin-run varnish_allocated config
sudo /etc/init.d/munin-node restart

This worked for varnish_allocated, varnish_cachehitratio, varnish_hitrate, and varnish_total_objects. The other varnish plugins listed on the site failed for me.