How to change host name in Linux 7

Step 1: Check the host name using hostnamectl command

[root@localhost ~]# hostnamectl status
   Static hostname: localhost.localdomain
         Icon name: computer
           Chassis: n/a
        Machine ID: 0d922750ffd94b6b9bce4b2c2b45e8d8
           Boot ID: 80bdfd10109148688a0dddb2cdee0f8a
    Virtualization: vmware
  Operating System: Red Hat Enterprise Linux Server 7.0 (Maipo)
       CPE OS Name: cpe:/o:redhat:enterprise_linux:7.0:GA:server
            Kernel: Linux 3.10.0-123.el7.x86_64
      Architecture: x86_64

Step 2: Change hostname to rhel7

[root@localhost ~]# hostnamectl set-hostname rhel7

Step 3: Now check the hostname status

[root@localhost ~]# hostnamectl status
   Static hostname: rhel7
         Icon name: computer
           Chassis: n/a
        Machine ID: 0d922750ffd94b6b9bce4b2c2b45e8d8
           Boot ID: 80bdfd10109148688a0dddb2cdee0f8a
    Virtualization: vmware
  Operating System: Red Hat Enterprise Linux Server 7.0 (Maipo)
       CPE OS Name: cpe:/o:redhat:enterprise_linux:7.0:GA:server
            Kernel: Linux 3.10.0-123.el7.x86_64
      Architecture: x86_64

[root@localhost ~]# hostname
rhel7

Step 4: Reboot OS 

[root@localhost ~]# reboot

Step 5: Check now the OS name changed or not

login as: root
root@192.168.133.129's password:
Last login: Tue Jan 26 15:13:10 2016 from 192.168.133.1
[root@rhel7 ~]#