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1. vào single mode
http://www.itzgeek.com/how-tos/linux/centos-how-tos/single-user-mode-in-centos-7-rhel-7.html#axzz3VGs5yvm5
2. reset pass như sau:
chroot your system
chroot /sysroot
reset the root password.
passwd
Update SELinux information.
touch /.autorelabel
Exit chroot
exit
Reboot your system.
reboot