change /usr/lib/systemd/system/[email protected] likes this and reboot
ExecStart=-/sbin/agetty --noclear %I
==>
ExecStart=-/sbin/agetty --autologin zhj --noclear %I
Centos6.5 minimal server
change /etc/init/tty.conf exec /sbin/mingetty $TTY ===> exec /sbin/mingetty --autologin zhj $TTY
References
http://www.linuxjournal.com/article/3121?page=0,1
http://forums.fedoraforum.org/showthread.php?t=297228
http://blog.hostonnet.com/auto-login-to-linux-console-in-centos-6