How to set root auto login RHEL 7.0 / SLES 12

How to set root auto login RHEL 7.0 / SLES 12

RHEL 7.0
Edit /etc/gdm/custom.conf to add [daemon] 
add the following two lines in the [daemon]
section:

[daemon]
AutomaticLoginEnable=true
AutomaticLogin=root

SLES 12 

Open Terminal.

Edit the /etc/sysconfig/displaymanager file.

vi /etc/sysconfig/displaymanager

To enable the autologin, place your user name (in my case “raj”) in the DISPLAYMANAGER_AUTOLOGIN field; it will look like below.

## Type: string ## Default: # # Define the user whom should get logged in without request. If string # is empty, display standard login dialog. # DISPLAYMANAGER_AUTOLOGIN="root"

To disable auto login, remove the username from the DISPLAYMANAGER_AUTOLOGIN field; it will look like below.

## Type: string ## Default: # # Define the user whom should get logged in without request. If string # is empty, display standard login dialog. # DISPLAYMANAGER_AUTOLOGIN=""