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Reset root Password
If you forgot root Password, it's possible to reset it like follows.
(This is only for the case GRUB boot loader Password is not set)
[1] Restart System and when GRUB2 boot menu is displayed, Push [e] key.
Next, Proceed like follows to reset root password.
      # push [e] key
      Rocky Linux (4.18.0-305.3.1.el8_4.x86_64) 8.4 (Green Obsidian)
      Rocky Linux (0-rescue-98bc67d7659a4dd185060002cd4cc38a) 8.4 (Green Obsid>

      Use the ^ and v keys to change the selection.
      Press 'e' to edit the selected item, or 'c' for a command prompt.

     # add [rw init=/bin/bash] to the end of [linux] line

     set gfx_payload=keep
     insmod gzio
     linux ($root)/vmlinuz-4.18.0-305.3.1.el8_4.x86_64 root=/dev/mapper/rl-root ro \
     crashkernel=auto resume=/dev/mapper/rl-swap\
     p console=ttyS0,115200n8 rw init=/bin/bash
     initrd  ($root)/initramfs-4.18.0-305.3.1.el8_4.x86_64.img $tuned_initrd

      Press Ctrl-x to start, Ctrl-c for a command prompt or Escape to
      discard edits and return to the menu. Pressing Tab lists
      possible completions.

      # after inputting above, push [Ctrl-x] key to proceed
[  OK  ] Stopped Load Kernel Modules.
[  OK  ] Stopped target Swap.
[  OK  ] Started Cleaning Up and Shutting Down Daemons.
[  OK  ] Stopped udev Kernel Device Manager.
[  OK  ] Stopped Create Static Device Nodes in /dev.
[  OK  ] Stopped Create list of required sta…vice nodes for the current kernel.
[  OK  ] Stopped dracut pre-udev hook.
[  OK  ] Stopped dracut cmdline hook.
[  OK  ] Closed udev Kernel Socket.
[  OK  ] Closed udev Control Socket.
         Starting Cleanup udevd DB...

# after initramfs switch_root prompt is displayed, do like follows

# set SELinux relabeling on next boot if you enabling SELinux

touch /.autorelabel
# set password


Changing password for user root.
New password:
Retype new password:
passwd: all authentication tokens updated successfully.
# restart System and complete to reset

exec /sbin/init
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