Fedora 21
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Set Hostname
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: ef81d676af1644de9a2dc1a5b977c7fc
           Boot ID: 71322d9f25fd4f9b803591916fbad4fb
    Virtualization: vmware
  Operating System: Fedora 21 (Twenty One)
       CPE OS Name: cpe:/o:fedoraproject:fedora:21
            Kernel: Linux 3.17.4-301.fc21.x86_64
      Architecture: x86-64
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