topic Re: Reset root password in Operating System - Linux

Reset root password

Cliff Lim Kok Hwee — Thu, 09 Mar 2006 23:37:02 GMT

Hi Forumers,

Currently running RedHat 4.0 and the root password had been changed accidentally.

Anyway to have it change during a reboot?

Thanks/cliff

Re: Reset root password

Maaz — Fri, 10 Mar 2006 00:12:30 GMT

boot the system in runlevel 1. and then reset the root passwd. Linux system doesnt ask for root passwd when booting in runlevel 1

Hope this will help
Regards
Maaz

Re: Reset root password

Ajay Agarwal — Fri, 10 Mar 2006 00:34:39 GMT

Boot the system in single-user mode and change the root passwd.

Steps to boot into single-user mode:

If you are using GRUB, use the following steps to boot into single-user mode:

If you have a GRUB password configured, type p and enter the password.

Select Red Hat Linux with the version of the kernel that you wish to boot and type e for edit. You will be presented with a list of items in the configuration file for the title you have selected.

Select the line that starts with kernel and type e to edit the line.

Go to the end of the line and type single as a separate word (press the [Spacebar] and then type single). Press [Enter] to exit edit mode.

Back at the GRUB screen, type b to boot into single-user mode.

If you are using LILO, at the LILO boot prompt (if you are using the graphical LILO, you must press [Ctrl]-[x] to exit the graphical screen and go to the boot: prompt) type:

linux single

Re: Reset root password

Jees Joy — Fri, 10 Mar 2006 02:15:22 GMT

Reboot the box in runleve one and issue the command "passwd root" give your new password.

Re: Reset root password

Vipulinux — Fri, 10 Mar 2006 04:23:31 GMT

Hi

Do the following:

Boot using cd:
at boot prompt do:
linux rescue
thenb
chroot /mnt/sysimage
passwd
(give new password)

Cheers

Re: Reset root password

Cliff Lim Kok Hwee — Fri, 10 Mar 2006 05:08:30 GMT

Hi Forumers,

I had managed to login to server and change the root access.

Using command prompt I am able to useradd and groupadd etc.

But when running the GUI User and Group I got the following error messages

"The user database cannot be read" This problem is most likely caused by a mismatch in /etc/passwd and /etc/shadow. The program will exit now.

I checked the /etc/passwd and /etc/shadow but no mismatch to the users account.

Please advise me.

Thanks/cliff

Re: Reset root password

Vipulinux — Fri, 10 Mar 2006 05:48:38 GMT

Hi
Please run the consistency check on the passwd and shoadow file ..give the foll command:

pwdck and
grpck

Cheers

Re: Reset root password

Ivan Ferreira — Fri, 10 Mar 2006 13:26:09 GMT

Check for a file in /etc called:

pass*.lock
shad*.lock

This file may be preventing the access to the files.

Re: Reset root password

Ajay Agarwal — Sat, 11 Mar 2006 01:16:38 GMT

Try pwck and pwconv cmd.
Read the man page for "pwck" then "pwconv".
Scan /etc/login.defs