> Am 25.01.2022 um 18:46 schrieb Thomas Cameron 
> <thomas.came...@camerontech.com>:
> 
> I just did a fresh kickstart of F35 Server. I didn't do anything to set the 
> hostname during installation. 
> 
> At first boot, I could see that the hostname was set to the reverse 
> DNS-provided hostname "hostxxx.tc.camerontech.com" - this is normal and 
> expected. 
> 
> When I log in via ssh or on the KVM console, the hostname is 
> hostxxx.tc.camerontech.com UNITL I REBOOT. 
> 
> Once I reboot, the hostname is set up "fedora" with no FQDN. I am assuming 
> it's somehow being set because of the lines in /etc/profile where the 
> hostname is set, but I'm not sure. 
> 

Disabling systemd-resolved might not be the best idea. That makes you a good 
candidate for surprise follow-up problems elsewhere. 

I’m wondering, if something is wrong with your DHCP / DNS service.

systemd-resolved „knows“ there kind of hostnames:

If you don’t touch the hostname during installation, you get a „transient 
hostname“ with fallback „fedora“, if the system get’s no hostname from DHCP, or 
a similar service. The transient hostname is evaluated at each boot time. If 
your DHCP service provides a hostname, it is used. Otherwise - just as a 
fallback - fedora is used.

As soon as you define a „static hostname“, that hostname is fixed and will not 
be changed in the future (unless you change it explicitly), regardless what 
your DHCP server might deliver. If I remember correctly, the static hostname is 
synchronised with the classic /etc/hostname. Or maybe, it is a one-time action. 

And that is exactly the way, F35 works. I just tested the setup. (Usually I go 
the other path and define a static hostname in the installation process and the 
DHCP server picks that hostname and creates an DNS entry). 

(For details see 
https://www.freedesktop.org/software/systemd/man/hostnamectl.html) 


Best
Peter

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