root password reseting in centos

• In the grub menu select actual kernel and type “-e”

• Go to the line with “linux 16” and change ro to rw init=/sysroot/bin/sh”.

before:

after:

• Press ctrl+X for starting a single mode session

• When single mode is started access to the system…:

  chroot /sysroot
  

• And using passwd command change the root’s password:

  passwd root
  

• Finally, it is necessary to update SELinux information by createing an empty .autorelabel in /

  touch /.autorelabel
  

• Exit from single mode session

• Try to login using a new password