=====Reset the Root Password=====
To access that root shell, follow these steps:
Reboot the system.
* Interrupt the boot-loader countdown by pressing any key, except Enter.
* Move the cursor to the rescue kernel entry to boot (the entry with the rescue word in its name).
* Press e to edit the selected entry.
* Move the cursor to the kernel command line (the line that starts with linux).
* Append **rd.break**. With that option, the system breaks just before the system hands control from the initramfs image to the actual system.
* Press Ctrl+x to boot with the changes.
* Press Enter to perform maintenance when prompted.
To reset password you need to:
* Remount /sysroot as read/write. mount -o remount,rw /sysroot
* Switch into a chroot jail, where /sysroot is treated as the root of the file-system tree. chroot /sysroot
* Set a new root password. passwd root
* Ensure that all unlabeled files, including /etc/shadow at this point, get relabeled during boot. touch ./autorelabel
* type exit twice
this can take a while other option is to use load_policy -i
this causes Selinux policy to be loaded and now we can use Selinux commands
restorerecon -FvR /etc/shadow
This relabels /etc/shadow correctly. You can exit the server and reboot as it will start to generate errors
when making changes to grub you need to edit the **/etc/default/grub** once you are done you need to regenerate the grub config file
grub2-mkconfig -o /boot/grub2/grub.cfg