To enter emergency mode and change the root password: 1) Edit the kernel line at boot to append "rd.break" to enter emergency mode. 2) Mount the sysroot in read-write mode and chroot into it to change the root password using the "passwd" command. 3) Touch the hidden file ".autorelabel" and run "sync" to relable files and flush caches before rebooting with the new root password.

1. Rebootthe systemandpressany keyto stopthe auto-bootfromthe defaultkernel.Press“e”after
selectingthe kernel line.
Whenyouare in editmode,goto the line startingwith linux16andappend rd.break to the endof this
line.
PressCTLR+x afterappendingthe rd.breaktothe kernel.Thiswill rebootthe systemintoemergency
mode.
Firstwe will remountthe sysrootfile systeminreadwrite mode andthenuse chrootto got intoa chroot
jail:
# mount -o remount,rw /sysroot
# chroot /sysroot

2. Finally, type passwd command in the command line and set the new password for root user. You
might get some warnings like “password fails dictionary check” if your password is weak. You
may safely ignore the warning and set the password you want.
# passwd
Make sure that all unlabeled files ( including shadow file ) gets relabeled during booting.
Touching the hidden file autorelabel instructs SElinux to relabel the files changed outside of its
regular context, like the file /etc/shadow.
# touch /.autorelabel
sync
To flush all cache to disk, type the command:
# sync
Reboot
Type twice the exit command to leave the chroot environment and log out. The system will apply
some SELinux contexts and reboot. You can now log in using your newly set root password.