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Old 08-21-2008, 02:32 AM   #1
anupamjamatia
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Registered: May 2008
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Smile How to get the Root password


Dear Friends , I have forget my Fedora OS root password.i dont know the user password too ..so i am not able to enter my fedora os. So if anybody knows the method please let me know .
Thank you
Anupam

Last edited by anupamjamatia; 08-21-2008 at 02:35 AM.
 
Old 08-21-2008, 02:35 AM   #2
rgriffiths
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the default passwd is just <enter. .. oe blank, unless you set it
If you did set it, and have forgotten it, there's bad news.
a re-install is needed.
 
Old 08-21-2008, 02:58 AM   #3
jomen
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No reinstall needed - but a live-CD (or put the disk into another working system) to mount the filesystem and edit the passwd file (and shadow?).
If the file system is encrypted then you are out of luck indeed.

Last edited by jomen; 08-21-2008 at 02:59 AM.
 
Old 08-21-2008, 02:59 AM   #4
jschiwal
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If booting into single mode doesn't ask for the root password, you can run the "passwd" command.

Another method is to boot up with a rescue disk or live distro; mounting the root partition; and zeroing out the password field in /etc/shadow.

Because Fedora Core and I assume CentOS and RHEL also use LVM, you will need to mount the partition using the LVM device instead of the actual partition
example:
mount -t ext3 /dev/system/rootvol /mnt/

Read the /etc/fstab file to get the name of device to use. The kernel should recognize the lvm members and assemble them and create a device node for you when you boot up.

After mounting the root partition on /mnt, cd to /mnt/etc/ and edit the /etc/shadow file.
Zero out the gibberish between the first and second colon. Then try rebooting, logging in as root (with no password), and running "passwd" to create a new password.

---

When I installed SuSE 11 on my laptop, I realized that I had somehow missed the part of entering the root passwd. When I tried to zero out the root password, the system would reject a login attempt. So I copied my regular user's encrypted password from /etc/shadow and used it for root. Then I was able to log in as root using my regular users password. However, you don't even remember that. You could copy a password hash from another system's /etc/shadow file.

---

There isn't a way to simply recover what the password is from the /etc/shadow entry, unless you brute force every possibility which could take a very, very long time.

Last edited by jschiwal; 08-21-2008 at 03:02 AM.
 
Old 08-21-2008, 03:25 AM   #5
stefanolima
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Quote:
Originally Posted by jschiwal View Post
If booting into single mode doesn't ask for the root password, you can run the "passwd" command.
I think single user mode is the simplest way to resolve password issues, as the root can login without a password, then from there you can reset your root password

single user:
while your machine boots, when you see grub press e for edit and arrow down to the kernel line

e.g.
kernel /vmlinuz-2.x.xx-x ro root=[...]

- press e for edit and then add 'single' to that line, press enter and b to boot
- U're then in single user mode and u can change root password
sh-[...]#passwd root
 
  


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