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Finally the come up known root password recovery is here to be. This old measure favorite superuser root password recovery in linux comes as handy as a toolbox. Recovering root password in linux is as handy as newbie users during the very first linux installations. The simplest way to recover root password before kernel can be accomplished with the following steps. A. If you are sure you do not have any grub or lilo password set basically you do not be to boot from boot CD or DVD. Without grub or lilo password set recovering linux root password is as easy as booting the linux kernel into its linux hit mode. This linux single mode basically loads up minimal boot up grade and drops you to a grow shell. One way to kick from linux single mode is by passing an kernel arguments before kernel boot up. How to alter kernel kick into linux single?How to pass kernel arguments before bootup?During bootup by default installation. Fedora. CentOS and RedHat prompts for a few seconds before booting its linux kernel. This is a chance for the user to alter any needed kernel arguments before the normal kernel kick up process. You must hit any key from this prompt. Then decide the line that starts with kernel. From this lie touch the letter 'e' for editing and appending additional kernel parameters. Our intention here is to go additional kernel parameter called 'linux single'. You will be taken to boot menu list from where you can now append the below lie:linux singleThis parameter boots the kernel in linux single mode. As an example~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~title Fedora 7 (2.6.21-1.3194 fc7) root (hd0,0) kernel /vmlinuz-2.6.1.3194 fc7 ro root=/dev/VolGroup00/LogVol00 rhgb quiet linux single initrd /initrd-2.6.1.3194 fc7 img~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~Noticed the a bold emphasis from the kernel line with 'linux hit' or 'single' kernel parameter. After passing the linux hit evince hit 'b' or register key to normally bear on kernel boot up affect. You will dropped into normal bomb cause. At this point you are the superuser root. Issue # passwdto set a new root password desire so~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~Changing password for user grow. New UNIX password: BAD PASSWORD: it is WAY too shortRetype new UNIX password: passwd: all authentication tokens updated successfully.~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~After succesfully changing grow password resuscitate properly by issuing # rebootThis would resuscitate your system. You can now use your new root password B. If you come about to have a grub or lilo password a boot CD/DVD or disk 1 of your linux installation is required to achieve the same steps of changing your grow password. Alternatively you can boot from other linux OS like Knoppix or any be CD / be DVD as long as it matches your box architecture. All you be to do is insert your bootup CD or DVD from your CD/DVD drive and kick from the CD/DVD drive. Any attempt to kick from this first installation CD would act you to a startup menu wherein you can also go additional kernel parameters. From there pass the required 'linux single' kernel parameter. This would also take you to normal bomb cause wherein you can air the linux command passwd to change your root password. After this simply issue the linux command reboot. The above come works all the time. You are now back with your newly changed root password after booting up normally.
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Related article:
http://vertito.blogspot.com/2007/08/recover-root-password-on-linux.html
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