Reset root password in CentOS 7

Following steps will guide you in resetting root password

• Restart the CentOS 7 system

• Press any key to interrupt the boot loader countdown

• Select Linux Kernel line which needs to be booted

• Press e to edit the select Linux Kernel entry

• Append rd.break at end of linux16 line

• Press CTRL + x to boot system

• Mount /sysroot in read-write mode

  switch_root:/# mount -oremount,rw /sysroot

• Switch into a chroot jail environment

  switch_root:/# chroot /sysroot

• set a new root password

  sh-4.2# passwd root

• To enable SELinux relabeling of /etc/shadow file, create a empty file like

  sh-4.2# touch /.autorelabel

• Press exit twice to exit chroot and initrdramfs shell