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)

[Cyrille_V]

Yes, you are correct, thank you.

[RH-Yamato]

This is one of the most frequently asked questions by Red Hat Certification beginners, and I always recommend everyone to refer to the official Red Hat documentation.

In the RHEL 9 documentation, click on "System Administration", then navigate to "Configuring basic system settings" as shown below:

https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/9/#System%20Administration

From there, go to section 7.6.3, titled "Resetting the root password".

I believe this is very useful content for anyone interested in our products.

While many candidates try to memorize all the steps, that approach may work for some.

However, from my perspective, I strongly recommend becoming familiar with the official Red Hat documentation. It provides valuable information that can help you not only during the exam, but also in real-world situations.

[Chetan_Tiwary_]

@RH-Yamato very good point ! - to become familiar with the official Red Hat documentation - I second this statement.