Fedora 35
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Set Hostname2021/11/05

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: 4d832da9210f4cf8a4e4fbda78a5f42f
         Boot ID: 782a2058fcc74321938134befdb1709a
  Virtualization: kvm
Operating System: Fedora Linux 35 (Server Edition)
     CPE OS Name: cpe:/o:fedoraproject:fedora:35
          Kernel: Linux 5.14.10-300.fc35.x86_64
    Architecture: x86-64
 Hardware Vendor: Red Hat
  Hardware Model: KVM
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