Fedora 25
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Set Hostname
This is the example for setting Hostname of your system.
[1] Change hostname. (but if rebooting, it will be back).
# show current hostname

[root@localhost ~]#
# change hostname

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

[root@localhost ~]#
# just changed

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

[root@localhost ~]#
   Static hostname: dlp.srv.world
         Icon name: computer-vm
           Chassis: vm
        Machine ID: d5ecdc1054204a408f3c40d15c0011dd
           Boot ID: ef8cb770f05c4a98b6bed5c451304302
    Virtualization: kvm
  Operating System: Fedora 25 (Server Edition)
       CPE OS Name: cpe:/o:fedoraproject:fedora:25
            Kernel: Linux 4.8.8-300.fc25.x86_64
      Architecture: x86-64
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