Crack root password

[ronald992]

Recently a week back I had attempted RHCSA certification and tried the below command but unfortunately was not successful in rhel 8 , does any one know otherway to crack root password.
Linux line end added rd.break - ctrl x - mount -o remount,rw /sysroot - chroot /sysroot -passwd root , changed the password and got message authentication successful and then touch /.autorelable and then exit and logout

[Vincent2]

I tried this also and it did not work... but this method worked for me.

#1. delete rhgb.silent with rd.break   also add   enforcing=0 (replaces the need for touch /.autorelable)

#2. mount -o remount,rw /sysroot (add read and write to the sysroot dir)

#3 chroot /sysroot

#4 whoami to check if you are root.

#5 passwd enter the new root password twice

#6 mount -o remount,ro / (add read only to the root dir)

#7 exit to get out of that directory

#8 reboot

#9 select the root user and login with the new password

Hope this helps :) Let me know if this is correct

[ronald992]

Thanks , sure let me try this and confirm

[Cyrille_V]

ronald992, don't forget to create an autoelabel file, BEFORE reboot (if selinux is enforcing on this box). Otherwise SELinux will refuse to recognize "touched" /etc/passwd and /etc/shadow files after your reboot and you will not be able to login at all and need to repeat this action again. Just do:

#> touch /.autorelabel     with dot)

and then reboot

SELinux will do re-labeling of the whole system after reboot and will accept your modified two files.

Regards

[Vincent2]

This is the documentation for the procedure.

https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/system_administrators_...

[EmanuelHaine]

Another way is to set "systemd.debug-shell" on kernel line at grub menu. Then CTRL+x

It will iniate a root session on tty9 and there is no need of remount, chroot and .autorelabel

[IvanLabrovic]

Hi! You may have a typo: .autorelable (yours )vs .autorelabel (this should be it)