You cannot recover the old password but you can reset it. The easiest way to do this is by rebooting into single user mode, making the file system writable and then change the password. In my case, I am using Oracle's Unbreakable Linux which is basically Red Hat
STEP 1: Boot into single user mode from GRUB
Reboot the system, and when you are at the selection prompt (GRUB), hit F2. This will keep you in GRUB screen. It will show you the version of Linux you are using. Press 'e'.
This will refresh the screen where you should select the entry that begins with 'kernel' and press 'e' again.
Append ' single' to the end of that line (without the quotes). Make sure that there is a space between what's there and 'single'. If your system requires you to enter your root password to log into single-user mode, then append init=/bin/bash after 'single'. Hit 'Enter' to save the changes. In my case I have to type the whole thing
' single init=/bin/bash' without the quotes.
Press 'b' to boot into Single User Mode.
Once the system finishes booting, you will be logged in as root. Your file system is in read-only mode at this point
STEP 2: Change your file system so it is in read-write mode
Type in 'mount -o remount,rw /' (without the quotes) at the # prompt and hit enter
STEP 3: Change the root password
Type in 'passwd root' (without the quotes) at the # prompt and hit enter. Give your new password and reconfirm.
STEP 4: Reboot the system
Type in 'reboot' (without the quotes) at the # prompt and you are done.
Friday, February 19, 2010
Wednesday, February 10, 2010
- Take a deep breath
- Hold your breath for 3 seconds
- Breathe out through your mouth
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Posted by Curious Mind at 10:45 AM