Re: where does `hostname -f` derive the domainname from?

[Michael Stone <mstone@debian.org>]

On Sun, Jun 26, 2022 at 04:59:26PM -0400, Jim Popovitch wrote:
> That was the problem.  The bullseye-only system had an /etc/hosts entry
> without a FQDN.  I removed that and it uses the one in DNS.

It's generally better to add the FQDN to /etc/hosts instead, to cut down 
on DNS queries for the local hostname.