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You need to have physical access to the machine's console.
Note the root partition Solaris uses:
Press the STOP and A keys simultaneously, or, on an ASCII terminal or emulator, send a <BREAK>) to halt the operating system, if it's running.
Boot single-user from CD-ROM (boot cdrom -s) or network install/jumpstart server (boot net -s). For CD media use the CD-ROM labeled "Installation". I prom pssword is set you need to know it
Mount the root partition on "/a". "/a" is an empty mount point that exists at this stage of the installation procedure. For example:
#mount /dev/dsk/c0t0d0s0 /a
If the mount command fails and since "/a" always exists, then you either typed in the wrong device, OR the system is seeing the root partition as something else.
Do a "ls /tmp/dev/dsk" and see what is there. "c0t6" things are the CD-ROM, what is left is what one needs to try. On a Blade 1000/2000, choose /dev/dsk/c1t1d0s0, and execute: #mount /dev/dsk/c1t1d0s0 /a
Set your terminal type so you can use a full-screen editor, such as vi. You can skip this step if you know how to use "ex" or "vi" from open mode.
Edit the passwd file, /a/etc/shadow (or perhaps in older versions, /etc/passwd) and remove the encrypted password entry for root.
Type: "cd /; then "umount /a"
Reboot as normal in single-user mode ("boot -s"). The root account will not have a password. Give it a new one using the passwd command. PROM passwords: Naturally, you may not want anyone with physical access to the machine to be able to do the above to erase the root password. Suns have a security password mechanism in the PROM which can be set (this is turned off by default). The man page for the eeprom command describes this feature.
If security-mode is set to "command", the machine only be booted without the prom password from the default device (i.e. booting from CD-ROM or install server will require the prom password). Changing the root password in this case requires moving the default device (e.g. the boot disk) to a different SCSI target (or equivalent), and replacing it with a similarly bootable device for which the root password is known. If security-mode is set to full, the machine cannot be booted without the prom password, even from the default device; defeating this requires replacing the NVRAM on the motherboard. "Full" security has its drawbacks -- if, during normal operations, the machine is power-cycled (e.g. by a power outage) or halted (e.g. by STOP-A), it cannot reboot without the intervention of someone who knows the prom password.
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Let's start by inserting the Solaris installation CD-ROM and then shutting down the system. Press...Stop-A
This will bring you the OK prompt. Now type:boot cdrom -s
and after a few minutes you will automatically be logged in as root in single user mode. It is possible that you get messages from your system claiming that some partitions were not cleanly unmounted. If this is the case check the partition as follows (assuming that your root partition is mounted on /dev/dsk/c0t0d0s0):fsck -y /dev/dsk/c0t0d0s0
Now mount your root partition...mount /dev/dsk/c0t0d0s0 /a
and edit /a/etc/shadow. Find root's entry in this file and remove the second field (encrypted root password) so it looks like...root::98765::::::
After making your change, save the file and reboot the system.reboot
You are now able to log into the system without a password for root. So now use the passwd command to set root's password.
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