Change hostname CentOS 7.x

[1]. Change hostname. (but if rebooting, it will be back).

# show current hostname

[root@localhost ~]# hostname 

# change hostname

[root@localhost ~]# 

[root@localhost ~]# hostname   # just changed

[2]. Change hostname permanently

[root@localhost ~]# hostnamectl set-hostname

# show status

[root@localhost ~]# hostnamectl 

   Static hostname:
         Icon name: computer-vm
           Chassis: vm
        Machine ID: 98a49a78fc9ad91f1b99304c75b94c31
           Boot ID: 09b95ce0bc7f4179b1e8a011ed314c6b
    Virtualization: kvm
  Operating System: CentOS Linux 7 (Core)
       CPE OS Name: cpe:/o:centos:centos:7
            Kernel: Linux 3.10.0-123.4.2.el7.x86_64
      Architecture: x86_64

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