How to reset root password on RHEL/CentOS 7

                                                                           

Booting straight up to GRUB is not the default boot method for RHEL/CentOS 7.Step by step  process of resetting the root password in RHEL/CentOS 7 Installation.

                            Reset root password on RHEL/CentOS 6

Step1: Boot or Reboot your CentOS/RHEL Server
                                      

   After the reboot, it will come up to a boot countdown like see below image. Here, you can press any key. Then it will go to GRUB menu.
                                                           

                                                                                          

Step2: GRUB Menu

    In GRUB menu, select the appropriate kernel version and press the Key "e". Now you will get the options  menu for the kernel version. 

Step3: Change Kernel Boot Options

  To enter into single user mode; Go to second last line (Starts with linux16 or linuxefi) using up and down arrow then  modify the ro argument.
                                                                     

 Modify it to “rw init=/sysroot/bin/sh”. Once done, press “Ctrl+x”
                                                                     

                 

   Now you should be in command line mode with root privileges (without entering password). Now you can start to troubleshoot your system or can do maintenance of your system.
                                                                     

Step4: Set Root Password

   chroot to access your system.
      #chroot /sysroot
  Reset the root password
     #passwd root
  Update SELinux information
     #touch /.autorelabel
  Exit chroot
     #exit
                                       

Step5: Reboot your server

             Once you have completed this, reboot and you have a new root password for your CentOS/RHEL Installation. 

      #reboot (or) init 6
                                            

               Note: Reset Root Password in RHEL/Centos 6.X