One key difference might be enabled systemd-resolved by default in Fedora 34, but it is not in RHEL9. I think it should not be related directly. But could it? What does hostnamectl report after installation? What it thinks the hostname is? Would the behaviour change if you disable systemd-resolved and reboot?
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.
I looked at the hostname-mode option of NetworkManger.conf, but I've tried various settings and it doesn't seem to work. From the man page:
hostname-mode Set the management mode of the hostname. This parameter will affect only the transient hostname. If a valid static hostname is set, NetworkManager will skip the update of the hostname despite the value of this option. An hostname empty or equal to 'localhost', 'localhost6', 'localhost.localdomain' or 'localhost6.localdomain' is considered invalid. default: NetworkManager will update the hostname with the one provided via DHCP or reverse DNS lookup of the IP address on the connection with the default route or on any connection with the property hostname.only-from-default set to 'false'. Connections are considered in order of increasing value of the hostname.priority property. In case multiple connections have the same priority, connections activated earlier are considered first. If no hostname can be determined in such way, the hostname will be updated to the last one set outside NetworkManager or to 'localhost.localdomain'. dhcp: this is similar to 'default', with the difference that after trying to get the DHCP hostname, reverse DNS lookup is not done. Note that selecting this option is equivalent to setting the property 'hostname.from-dns-lookup' to 'false' globally for all connections in NetworkManager.conf. none: NetworkManager will not manage the transient hostname and will never set it.
I've set the hostname-mode to "default" in the
NetworkManager.conf file and rebooted but it doesn't make any
difference.
Here are screenshots: https://imgur.com/a/gRzswnI
Thomas
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