sudo: unable to resolve host (FQDN)

[thufir]

After looking over the man page and the google, it's less clear than when 
I started.

In any event, I'm trying to setup an FQDN as so:

https://gist.github.com/2186508


what I'm getting is that inn2 won't install correctly and that sudo gives 
an error (warning?) sudo: unable to resolve host dur.


My reading of man pages was to change the hostname in /etc/hosts and 
reboot, but obviously that's incorrect.   Aside from using the hostname 
command, what's required here?



thanks,

Thufir