CentOS Stream 9
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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
      CentOS Stream (5.14.0-115.el9.x86_64) 9
      CentOS Stream (5.14.0-105.el9.x86_64) 9
      CentOS Stream (5.14.0-86.el9.x86_64) 9
      CentOS Stream (0-rescue-ab414d4792d04b9dbc1e2361f936e849) 9

      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 gfxpayload=keep
     insmod gzio
     linux ($root)/vmlinuz-5.14.0-115.el9.x86_64 root=/dev/mapper/cs-root ro crashk\
     ernel=1G-4G:192M,4G-64G:256M,64G-:512M resume=/dev/mapper/cs-swap rd.lvm.lv=cs\
     /root rd.lvm.lv=cs/swap console=ttyS0,115200n8 rw init=/bin/bash
     initrd ($root)/initramfs-5.14.0-115.el9.x86_64.img

      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 Rule-based Manager for Device Events and Files.
[  OK  ] Closed udev Control Socket.
[  OK  ] Closed udev Kernel Socket.
[  OK  ] Stopped dracut pre-udev hook.
[  OK  ] Stopped dracut cmdline hook.
         Starting Cleanup udev Database...
[  OK  ] Stopped Create Static Device Nodes in /dev.
[  OK  ] Stopped Create List of Static Device Nodes.
[  OK  ] Finished Plymouth switch root service.

# after 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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