How To Break Root Password in Linux(Centos/RHEL 5)

How To Break Root Password

Case I:--

If Bootloader don't have password or we know bootloader password

Key Points:--

1.    Select Redhat linux title and press E to edit

2.    Press E to edit kernel line

3.    then type 1 after giving single space

4.    Below Editing

5.    kernel /vmlinuz-2.6.32-71.el6.x86_64 ro ....................crashkernel=auto rhgb quiet

6.    After Editing

7.    kernel /vmlinuz-2.6.32-71.el6.x86_64 ro......................crashkernel=auto rhgb quiet 1

8.    Then Enter and boot by B

9.    then check Selinux

10. if selinux is enforcing then change to permisive by:--

11. #setenfoce 0

12. then change password

Case II:--

If we don't know bootloader password

Key Points:--

1.    Boot by Linux DVD

2.    Select Rescue Mode

3.    #chroot /mnt/sysimage

4.    passwd      (cmd to change password)