CentOS Stream 9
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Set Hostname2022/01/18

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: 0ee8aaabffd64d7c83abb8937d15fecc
         Boot ID: 301e1f482f1c4c9888374aa471ba0fad
  Virtualization: kvm
Operating System: CentOS Stream 9
     CPE OS Name: cpe:/o:centos:centos:9
          Kernel: Linux 5.14.0-41.el9.x86_64
    Architecture: x86-64
 Hardware Vendor: Red Hat
  Hardware Model: KVM
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