Jake,
Which Linux are you using?
I tried on SLES, but could not get logged in as root without the password.
In "The Virt'n Cookbook" section 26.1.1 "Enter single user mode", it states:
"In single user mode, you are logged in as the root user."
But this does not seem to be the case (who wrote that book? - somebody
better fix it :))
What I see is a prompt for the root password:
INIT: Going single user
INIT: Sending processes the TERM signal
*Give root password* for maintenance
(or type Control-D to continue):
My next approach would be to link to the disk with the root file system
R/W, mount it, and chroot to it. Do you have another Linux system you can
use? Here's an example of modifying the root password on LINUX138 which as
a 100 minidisk as the root file system (this virtual machine has OPTION
LNKNOPAS so I am not prompted for the MR password on the LINK command):
# *vmcp link linux138 100 1100 mr*
# *chccwdev -e 1100*
Setting device 0.0.1100 online
Done
# *lsdasd*
Bus-ID Status Name Device Type BlkSz Size Blocks
==============================================================================
0.0.0100 active dasda 94:0 ECKD 4096 7042MB 1802880
0.0.0101 active dasdb 94:4 ECKD 4096 7042MB 1802880
0.0.*1100 *active *dasde *94:16 ECKD 4096 7042MB 1802880
# *ls /mnt*
# *mount /dev/dasde1 /mnt*
# *chroot /mnt*
# *passwd root*
Changing password for user root.
New password:
BAD PASSWORD: The password is shorter than 8 characters
Retype new password:
passwd: all authentication tokens updated successfully.
# *exit*
# *umount /mnt*
# *vmcp det 1100*
DASD 1100 DETACHED
HTH.
-Mike
On Thu, Feb 19, 2015 at 10:42 AM, Veencamp, Jonathon D. <
[email protected]> wrote:
> And single user mode puts you right into root without password, because
> it's assumed if you control the console, then you must be ok. (control
> your consoles everyone!)
>
> Have I got that right?
>
> -----Original Message-----
> From: Linux on 390 Port [mailto:[email protected]] On Behalf Of
> Bruce Hayden
> Sent: Thursday, February 19, 2015 9:39 AM
> To: [email protected]
> Subject: Re: Single User mode Linux Guest
>
> Enter: passwd root
>
> root can change any password without knowing the existing one - even its
> own..
>
>
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