[root@rac1 ~]# hostnamectl status
   Static hostname: rac1.localdomain
         Icon name: computer-vm
           Chassis: vm
        Machine ID: 6e0c8926c41e4a20a84865657d99c26a
           Boot ID: 7850cbb5f1d448c5979582672ff7490a
    Virtualization: kvm
  Operating System: Oracle Linux Server 7.3
       CPE OS Name: cpe:/o:oracle:linux:7:3:server
            Kernel: Linux 4.1.12-61.1.18.el7uek.x86_64
      Architecture: x86-64

[root@rac1 ~]# hostnamectl set-hostname rac2.localdomain

[root@rac1 ~]# hostnamectl status
   Static hostname: rac2.localdomain
         Icon name: computer-vm
           Chassis: vm
        Machine ID: 6e0c8926c41e4a20a84865657d99c26a
           Boot ID: 7850cbb5f1d448c5979582672ff7490a
    Virtualization: kvm
  Operating System: Oracle Linux Server 7.3
       CPE OS Name: cpe:/o:oracle:linux:7:3:server
            Kernel: Linux 4.1.12-61.1.18.el7uek.x86_64
      Architecture: x86-64

[root@rac2 ~]# systemctl set-default multi-user.target
Removed symlink /etc/systemd/system/default.target.
Created symlink from /etc/systemd/system/default.target to /usr/lib/systemd/system/multi-user.target.