Solution  :  hostnamectl set-hostname --transient <hostname>

It appears there is a thing called transient hostname.



On 2024-08-19 09:10, Keith Smith via PLUG-discuss wrote:
> Hi,
>
> I am changing the hostname on Ubuntu 24.04LTS server.
>
> I do the following:
>
> Change the hostname using sudo vi /etc/hostname
> Change the hostname using sudo vi /etc/hosts
> Restart : sudo systemctl restart systemd-hostnamed
> Verify with : hostnamectl which returns the new hostname
>
> However when I issue the command "hostname" it gives me the old
> hostname.
>
> When I do a reboot the command hostname give the new hostname.
>
> Any thoughts why this is?
>
> Thanks!!
> Keith
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