Okay - I'm lost.
I have configd working fine and installed in /opt/collectd
(Version 5 built from source)
The RRD files from my host are located in /opt/collectd/var/lib/collectd/myhostname - which is the default location for the RRD plugin in the collectd configuration file.
I have collectd-web installed in /var/www/collectd-web - and it's working fine. I can browse to http://myhostname/collectd-web/ and I see the collectd-web application fine (apache settings are all okay and I cloned the git repository into this directory).
Can you please tell me how the collectd-web application is supposed to find the RRD data files?
Ah I think I found it. Syslog showed a JSON.pm errror.
cpan> install JSON.pm
appears to have fixed it.
I've also set /etc/collectd/collection.conf to point to the correct data directory in /opt/collectd/var/lib/collectd