Change hostname CentOS 7.x

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

# show current hostname

[[email protected] ~]# hostname 
localhost.localdomain

# change hostname

[[email protected] ~]# 
hostname srv.serversub.com 

[[email protected] ~]# hostname srv.serversub.com   # just changed


[2]. Change hostname permanently

[[email protected] ~]# hostnamectl set-hostname srv.serversub.com

# show status

[[email protected] ~]# hostnamectl 

   Static hostname: srv.serversub.com
         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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