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 , posted on March 11, 2009 at 8:51 am, filed under Monitoring and tagged debian, etch, munin. Bookmark the permalink. Follow any comments here with the RSS feed for this post.