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Short or long hostname ?

Hi,

For the last ten years or so, I've defined the short hostname in
/etc/hostname and the FQDN in /etc/hosts. Now I wanted to double-check
this information, which eventually led me to this page:

*
<a href="https://serverfault.com/questions/331936/setting-the-hostname-fqdn-or-short-name" title="https://serverfault.com/questions/331936/setting-the-hostname-fqdn-or-short-name">https://serverfault.com/questions/331936/setting-the-hostname-fqdn-or-sh...</a>

Now I admit I'm even more confused than before.

Is there some reliable piece of information on this subject for CentOS ?

Cheers,

Niki