Fedora 33
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Set Hostname
If you would like to change Host Name of your System, set like follows.
[1] Change hostname. (but when System restarted, it will be back)
# show current hostname

[root@localhost ~]#
# change hostname

[root@localhost ~]#
hostname dlp.srv.world

[root@localhost ~]#
# changed

[2] Change hostname permanently.
[root@localhost ~]#
hostnamectl set-hostname dlp.srv.world
# show settings

[root@localhost ~]#
   Static hostname: dlp.srv.world
         Icon name: computer-vm
           Chassis: vm
        Machine ID: c738c1e8902f4d48883fbbcf70c48073
           Boot ID: 8f8e1b6f26f24cb3a2b063358faea1c8
    Virtualization: kvm
  Operating System: Fedora 33 (Server Edition)
       CPE OS Name: cpe:/o:fedoraproject:fedora:33
            Kernel: Linux 5.8.16-300.fc33.x86_64
      Architecture: x86-64
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