Enhance your munin load graph

load-day-old

This is the default output of the munin load plugin.

I’ve patched it to add a permanent blue line indicating the number of cpu of the server. The resulted graph looks like this :

load-day

You can download the patched plugin here. It is tested with Linux and FreeBSD.

This entry was written by CharlyBr, posted on December 3, 2009 at 12:21 pm, filed under Monitoring and tagged , . Leave a comment or view the discussion at the permalink.

Munin and Use of uninitializer value in eval

On some of freshly installed servers (Debian Etch), I encountered these error messages in /var/log/munin/munin-node.log:

Use of uninitialized value in eval {block} exit at /usr/sbin/munin-node line 456, <CHILD> line 8.

What a great error message :)

After digging into Google results, I found it was just a problem with host_name variable in the configuration. Default value is hostname.localdomain. I’ve replaced it with a valid hostname and it works!

This entry was written by CharlyBr, posted on March 11, 2009 at 8:51 am, filed under Monitoring and tagged , , . Leave a comment or view the discussion at the permalink.