Set Hostname2021/04/29

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

# show current hostname

root@ubuntu:~#

hostname

ubuntu

# change hostname

root@ubuntu:~#

hostname dlp

root@ubuntu:~#

hostname

dlp

# just changed

[2]	Change hostname permanently.

root@ubuntu:~#

hostnamectl set-hostname dlp.srv.world

# show settings

root@ubuntu:~#

hostnamectl

   Static hostname: dlp.srv.world
         Icon name: computer-vm
           Chassis: vm
        Machine ID: 57d237ac2aed43cdbd503b10a02aa6e0
           Boot ID: 853ba06f39764fc3997d397f35e250b7
    Virtualization: kvm
  Operating System: Ubuntu 21.04
            Kernel: Linux 5.11.0-16-generic
      Architecture: x86-64

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