How to break root password !!!
Method 1:
One of the advantages of single-user mode is that you do not need a boot CD-ROM; however, it does not give you the option to mount the file systems as read-only or not mount them at all.
If your system boots, but does not allow you to log in when it has completed booting, try single-user mode.
In single-user mode, your computer boots to runlevel 1. Your local file systems are mounted, but your network is not activated. You have a usable system maintenance shell. Unlike rescue mode, single-user mode automatically tries to mount your file system.
Do not use single-user mode if your file system cannot be mounted successfully. You cannot use single-user mode if the runlevel 1 configuration on your system is corrupted.
1) When you reach the grub screen press 'e' on linux.
2) Go to line which contains the word 'kernel' press 'e'
3) go to the end of that line and write 'linux single' or '1'
4) then press 'esc' twice and press 'b' to reboot the system
5) now wait for the prompt and then type 'passwd root'
6) enter new passwd
Method 2:
In emergency mode, you are booted into the most minimal environment possible. The root file system is mounted read-only and almost nothing is set up. The main advantage of emergency mode over single-user mode is that the
init files are not loaded. If init is corrupted or not working, you can still mount file systems to recover data that could be lost during a re-installation. 1) Boot the computer with linux installation CD
2) Enter the linux rescue mode by entering the following command in boot screen
boot:linux rescue
3) When the sh prompt is reached, enter the following commands to change root password:
#chroot /mnt/sysimage
#passwd
The above step will prompt you to enter your new password
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