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Sunday, July 26, 2009

Change the Linux root password from single user mode

Step by step change root password:

1. Boot up your Fedora 10 system, on the boot up splash screen press and hold shift key until you enter the GRUB screen
Press and hold "shift" key here and wait until GRUB boot menu screen appear

2. if you have multiple operating system installed, you may have to select the Fedora 10 by using the 'up' and 'down' key... then hit the 'e' key to enter GRUB editing mode

3. Use the 'up' and 'down' key again, select the 'kernel /vmlinuz-2.6.27.5-117.fc10.i686 ro root=UUID=27f6ac23-638f-439a-8a97-2baaf6a32922 rhgb quiet', and the hit the 'e' key again to edit the grub command line.

4. The below screen appear after you hit the 'e' key, now notice that you mouse cursor at the end of line 'kernel /vmlinuz-2.6.27.5-117.fc10.i686 ro root=UUID=27f6ac23-638f-439a-8a97-2baaf6a32922 rhgb quiet'.

5. Change at the end of the line that say 'rhgb quiet' to 'linux single'

From : kernel /vmlinuz-2.6.27.5-117.fc10.i686 ro root=UUID=27f6ac23-638f-439a-8a97-2baaf6a32922 rhgb quiet

To : kernel /vmlinuz-2.6.27.5-117.fc10.i686 ro root=UUID=27f6ac23-638f-439a-8a97-2baaf6a32922 linux single

hit 'Enter' key after finish enter the 'linux single' at the end of kernel line, as show on GRUB.

6. Hit the 'b' key to boot the selected kernel and start the boot process to Linux single user mode.

7. After you hit the 'b' key, the Fedora 10 should reboot and then enter the single user mode and should give you root shell terminal without prompt any password field or ask for password.

Issue passwd command to change root user password on Fedora 10 after we finish the procedure to enter the Linux single mode as show on step by step example above.
[root@fedora /]# passwd <-- Start type in 'passwd' command and hit Enter key

Changing password for user root.

New UNIX password:

passwd: all authentication tokens updated successfully.

Then reboot the system and start using the new root password for your Fedora 10 system

[root@fedora /]# reboot <-- Type in 'reboot' command and hit Enter key to start reboot Fedora system

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3 comments:

  1. I tried the above sequence but it doesn't work properly. I have two users, one of the is root (su) and the other is student so I need to change any of them, it will be better to change the root.

    ReplyDelete

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