08-29-2001
Re: how do I log into this machine - with a twist...
Quote:
Originally posted by xyyz
The root password is unknown. This machine has no cdrom drive and it has no floppy drive.
2) Right now I'm at a loss. I have a Solaris 2.6 CD but as I mentioned no CDRom to access it. I was wondering if it's possible to put the CDRom in my FreeBSD server and somehow have the Sparc4 boot off the CD over the network.
3) The problem is the address of the Sparc4 not only in a different network, but it's a different class. Is there anyway I can change the ip address w/o logging into the machine?
4) If I am able to boot over the network and use the CD in my FreeBSD machine, how exactly would I go about 1. reinstalling the OS, 2. entering a new root password?
2) You can boot from a remote server but i belave it has to be another sun station. I could be wrong tho. Check into openboot. check the web for resourses.
3) NO. if you had root acccess you can change everything on the fly.
4) if you can get it to boot of the cdrom in single user mode. you can mount the "/" and edit /etc/shadow and remove the passwd field and then boot the box in regular mode hten log in as root w/ no password.
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LEARN ABOUT LINUX
sulogin
SULOGIN(8) Linux System Administrator's Manual SULOGIN(8)
NAME
sulogin - Single-user login
SYNOPSIS
sulogin [ -e ] [ -p ] [ -t SECONDS ] [ TTY ]
DESCRIPTION
sulogin is invoked by init(8) when the system goes into single user mode. (This is done through an entry in inittab(5).) Init also tries
to execute sulogin when the boot loader (e.g., grub(8)) passes it the -b option.
The user is prompted
Give root password for system maintenance
(or type Control-D for normal startup):
If the root account is locked, as is the default on Ubuntu, no password prompt is displayed and sulogin behaves as if the correct password
were entered.
sulogin will be connected to the current terminal, or to the optional device that can be specified on the command line (typically /dev/con-
sole).
If the -t option is used then the program only waits the given number of seconds for user input.
If the -p option is used then the single-user shell is invoked with a dash as the first character in argv[0]. This causes the shell
process to behave as a login shell. The default is not to do this, so that the shell will not read /etc/profile or $HOME/.profile at
startup.
After the user exits the single-user shell, or presses control-D at the prompt, the system will (continue to) boot to the default runlevel.
ENVIRONMENT VARIABLES
sulogin looks for the environment variable SUSHELL or sushell to determine what shell to start. If the environment variable is not set, it
will try to execute root's shell from /etc/passwd. If that fails it will fall back to /bin/sh.
This is very valuable together with the -b option to init. To boot the system into single user mode, with the root file system mounted
read/write, using a special "fail safe" shell that is statically linked (this example is valid for the LILO bootprompt)
boot: linux -b rw sushell=/sbin/sash
FALLBACK METHODS
sulogin checks the root password using the standard method (getpwnam) first. Then, if the -e option was specified, sulogin examines these
files directly to find the root password:
/etc/passwd,
/etc/shadow (if present)
If they are damaged or nonexistent, sulogin will start a root shell without asking for a password. Only use the -e option if you are sure
the console is physically protected against unauthorized access.
AUTHOR
Miquel van Smoorenburg <miquels@cistron.nl>
SEE ALSO
init(8), inittab(5).
17 Jan 2006 SULOGIN(8)