Root Password Lost !!! Post: 33486

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Top Forums UNIX for Advanced & Expert Users Root Password Lost !!! Post 33486 by hugo_perez on Tuesday 7th of January 2003 09:35:22 AM

01-07-2003

Registered User

Step by Step

You need to use:

a) A console, or

connect a PC/notebook in the serial port using the apropiate serial cable:

1) If the Serial console use an RJ45 as Serial conector
use the cable provided with the machine, or
if you use cisco switches use the terminal DB9
(for the PC an the cisco cable to serial 1)
2) If the Serial console use an DB25 connector as
Serial conector use the cable provided with the
machine, or an HP Serial cable DB9 to DB25

Because the most common case is to use a serial connection
the rest of the post is

b) Open an Hyperterminal/SecureCRT or whatever and
open a connection via COM1 (9600-8-N-1-None) using vt100
emulation.

c) Send a shift-break to halt the system

d) at the ok prompt
OK boot cdrom -s

e) After boot
TERM=vt100
export TERM
mkdir /tmp/d0
mount /dev/dsk/c0t0d0s0 /tmp/d0
cd /tmp/d0/etc

f) Leave blank the second field of the /etc/passwd
vi /tmp/d0/etc/passwd
( delete the x an save :wq! )

g) reboot

h) when prompt for root passwd press enter

i) change root passwd
passwd.

Note: If possible that you need to run an fsck
example: fsck -F <FSTYPE> -y /dev/rdsk/c0t0d0s0
FSTYPE: usually ufs

Note 2: If you use Solstice Disksuite in order to mirror
boot disk, you need to copy the modified /etc/passwd
to the other partition. I.E.:

f.1) mkdir /tmp/d1
mount /dev/dsk/c0t1d0s0 /tmp/d1
cp -p /tmp/d0/etc/passwd /tmp/d1/etc/passwd

Last edited by hugo_perez; 01-14-2003 at 01:37 PM..

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LEARN ABOUT MOJAVE

systemd-getty-generator

SYSTEMD-GETTY-GENERATOR(8)                                    systemd-getty-generator                                   SYSTEMD-GETTY-GENERATOR(8)

NAME

       systemd-getty-generator - Generator for enabling getty instances on the console

SYNOPSIS

       /lib/systemd/system-generators/systemd-getty-generator

DESCRIPTION

       systemd-getty-generator is a generator that automatically instantiates serial-getty@.service on the kernel console(s), if they can function
       as ttys and are not provided by the virtual console subsystem. It will also instantiate serial-getty@.service instances for virtualizer
       consoles, if execution in a virtualized environment is detected. If execution in a container environment is detected, it will instead
       enable console-getty.service for /dev/console, and container-getty@.service instances for additional container pseudo TTYs as requested by
       the container manager (see Container Interface[1]). This should ensure that the user is shown a login prompt at the right place, regardless
       of which environment the system is started in. For example, it is sufficient to redirect the kernel console with a kernel command line
       argument such as console= to get both kernel messages and a getty prompt on a serial TTY. See kernel-parameters.txt[2] for more information
       on the console= kernel parameter.

       systemd-getty-generator implements systemd.generator(7).

       Further information about configuration of gettys can be found in systemd for Administrators, Part XVI: Gettys on Serial Consoles (and
       Elsewhere)[3].

SEE ALSO

       systemd(1), agetty(8)

NOTES

        1. Container
               Interface
           https://www.freedesktop.org/wiki/Software/systemd/ContainerInterface/

        2. kernel-parameters.txt
           https://www.kernel.org/doc/Documentation/admin-guide/kernel-parameters.txt

        3. systemd for Administrators, Part XVI: Gettys on Serial Consoles (and Elsewhere)
           http://0pointer.de/blog/projects/serial-console.html

systemd 237                                                                                                             SYSTEMD-GETTY-GENERATOR(8)