Forget unix root password

Hi
A LAN administrator forgets his UNIX root password. Yes, I know it is frustrating to forget the root password. Any way, is there a way to login and change or reset the root password? Someone tried to boot off a Solaris 7 CD and cancelled the options INSTALLED and UPGRADE, then tried to mount /dev/rdks/c0t0d0s0 /mnt, but not working.
Thank you
Cindy

Hey Hey..
The option of "boot cdrom -s" , mounting the disk's root partition using a simple mount command and then editing the /etc/passwd and /etc/shadow files works fine whatever Solaris version.
Just make sure that your /etc/passwd root entry in the disk's root
(rememeber to /<mount point>/etc/passwd and not /etc/passwd when booting off the CD is like this.
root::0:1:Super-User:/:/sbin/sh
Note that the second filed in this file is BLANK.
Then also make sure that the /etc/shadow file entry alos looks
like this.
root::11515::::::
Note that the second filed in this file is BLAN here too.
Now you are all set and root has no password when you do a
reboot of the system through your disk.
HTH
Shridhar

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Regards,
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Message was edited by: sanlen

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Sudo root Password Prompt

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William Boyd, Jr. wrote:
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OVM server is just linux with the Xen hypervisor so it should reset fairly easily. Did you follow steps like the ones below, this is for RHEL which is the upstream Distro for the OVM Server kernel.
1. Boot the system and when you see the following message "Press any key to enter the menu", press any key. (You will see the list of available kernel versions.)
2. Press e in order to edit commands before booting.
3. Highlight the list item with vmlinuz in it by using the arrow keys and press e.
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### Shell Commands ###
passwd
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sourece: 7 easy steps to reset forgotten root password on CentOS/Red Hat | Javalobby
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How to Delete and Reset a Lost Root Password on a System With a Mirrored ??

hi All,
we are experiencing problem,lost root password on Solaris 10 Sparc T5120, with mirror root,
and we found the solution from Metalink.oracle.com, has anyone have try this??
here list capture the file system :
Filesystem size used avail capacity Mounted on
*/dev/md/dsk/d10 2.0G 349M 1.6G 18% /*
*/dev/md/dsk/d40 9.8G 563M 9.2G 6% /usr*
*/dev/md/dsk/d30 9.8G 1.4G 8.4G 15% /var*
*/dev/md/dsk/d50 7.9G 310M 7.5G 4% /opt*
*/dev/md/dsk/d600 3.8G 4.3M 3.8G 1% /home*
*/dev/md/dsk/d602 471M 20M 404M 5% /app/controlm*
*/dev/md/dsk/d601 471M 251M 173M 60% /app/ctsa*
*/dev/md/dsk/d604 4.9G 1.1G 3.8G 23% /app/oramon*
*/dev/md/dsk/d603 20G 11G 8.2G 58% /app/oracle*
*/dev/md/dsk/d606 39G 10.0G 29G 26% /proj/iprdb01/orafra/iprod01p*
here the step :
Solstice DiskSuite[TM] Software: How to Delete and Reset a Lost Root Password on a System With a Mirrored Root Disk [ID 1010755.1]
Solution
Steps to Follow
How to delete and reset a lost root password on a system with a mirrored root disk.
1) Insert the Solaris[TM] Operating System CD-ROM into the CD-ROM drive.
2) Once the CD-ROM is in the drive, perform a stop-a. This brings the system down to the "ok" prompt.
3) From the "ok" prompt, perform a single-user boot from the Solaris OS CD-ROM.
ok boot cdrom -s4) At the "#" prompt, determine which disk is the system's boot disk (containing the root file system). There are several Oracle architectures and various configurations of systems when it concerns a boot disk. As a general rule, most boot disks are attached to controller 0 (c0). Usually, their SCSI target is
either 3 (t3) or 0 (t0). However, Oracle machines are very flexible, and the boot disk could be at a different location. If you are not sure which disk is your boot disk, perform the following steps to determine the location of the boot device:
a) # eeprom boot-device
The output might appear to be simple, such as "disk" or "disk1" or more complicated, such as a pathname "/iommu/sbus/espdma@4,8400000/...../sd@3,0:a".
b) Make note of the boot-device. If the boot-device is a pathname, it is beyond the scope of this information to provide the location of the customized boot disk. However, for most configurations,
finding the customized boot disk is an easy task. The "Format" command shows all available disks:
#format
Searching for disks...done
AVAILABLE DISK SELECTIONS:
(enter its number): c) Enter d to exit format.
Now, you will have an idea what disks are on the system. Therefore, if the boot-device is "disk" and format shows "c0t0d0" (on some systems "c0t3d0") then that is the boot device. If boot-device
shows "disk1" and format shows "c0t1d0," then that is the boot device. If format shows multiple disks, then based on what the "eeprom boot-device" command shows, the system's boot disk would be:
boot-device format
disk c0t0d0 or c0t3d0 (machine dependent)
disk1 c1t0d0
disk2 c0t2d0
disk3 c0t3d0 or c0t0d0 (machine dependent)
and so on ....
5) Because the system was not brought down gracefully (no root password means having to use the Stop-a keystroke to "crash" the system), you need to run "fsck" to clean the root partition (slice). The fsckalso confirms that you selected the proper slice.
# fsck /dev/rdsk/c1t0d0s0
where the X and Y are determined by the previous procedure. It is also possible to have a root partition which is not on slice 0 (s0), but, again, that is not a standard configuration.
The output of "fsck" looks like this:
** /dev/rdsk/c1t0d0s0
** last mounted on /
** Phase 1 .....
The second line in the output of "fsck" ("** Last mounted on /") confirms that this is the correct root filesystem partition. Answer "y" to any questions fsck asks. There shouldn't be too many items
needing repair. If there are, there is a possibility of a corrupted root filesystem. After fsck is finished, mount the root partition:
# mount /dev/dsk/c1t0d0s0 /a
Again, X and Y are the same as for the fsck command.
For example:
# mount /dev/dsk/c1t0d0s0 /a
6) From the root prompt, set the proper TERM type command (such as vt100, dtterm, sun, and so on)
by entering this command:
# TERM=sun; export TERM
7) Use the VI text editor to edit the /etc/shadow file:
# vi /a/etc/shadow
8) The first line of the /etc/shadow file is the one you want to modify.
It looks like this:
root:c3.yAVmYodWsc:6445::::::
9) Delete every character between the first and second colons in the first line of the file. When you finish deleting the characters, the line should look like this:
root::6445::::::
10) Press the Escape key, then enter the following to save the file and exit vi:
:wq!
11) Use the VI text editor to edit the /etc/system file andremove the "rootdev" line shown below:
# vi /a/etc/system
*rootdev:/pseudo/md@0:0,0,blk
Don't comment out the "rootdev" line. Actually remove it.
12) In the /a/etc/vfstab file, replace the lines for the system filesystem meta-devices with their underlying partitions. For example, change lines from
/dev/md/dsk/d0 /dev/md/rdsk/d0 / ufs 1 no -
to
/dev/dsk/c1t0d0s0 /dev/rdsk/c1t0d0s0 / ufs 1 no -
ONLY change the lines for root (/) and the filesystems that were affected by the actions you took in step 1 of this procedure. All other metadevices may stay as is in this file.
13) Unmount root, check the root filesystem, and then stop the system:
# cd /
# umount /a
# fsck /dev/rdsk/c1t0d0s0
# stop-a
14) Boot to single-user mode:
ok boot -swTHIS STEP IS VERY IMPORTANT; YOU MUST BOOT TO SINGLE-USER MODE TO AVOID FILESYSTEM CORRUPTION.
If the system does not boot to single user mode, you might have made a mistake in the previous steps.
15) Because the root password was cleared in an earlier step, press Return when prompted for the the root password. Once you are in single-user mode, you must clear the metamirrors and all the sub-mirrors for the root filesystem. For example, if root (/) is d0, run the following command:
# metaclear -f -r d0
Running the metaclear command not only clears the metamirror but also clears the submirrors that are part of this mirror.
16) When the metamirror is cleared, continue the boot up to multiuser mode by either pressing CTRL-D or by entering the following:
# exit
Now everything should be as it was, except that the system partition is on the underlying partition and isn't mirrored. You will simply need to re-create the metadevices for the root mirror as you had originally.
many thanks

Hi,
Halt your machine.
Boot with fail-safe mode.
format and list out the disks. (You can get the root & mirror disk (c#t#d#) details from /etc/lvm/md.tab of your root or mirror disk. Earlier explorer output may help)
Mount the root disk and remove the password entry in /etc/shadow
umount it.
Mount the mirror disk and remove the password entry in /etc/shadow
umount it.
reboot the server.
Hope this helps!

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Reset lost root password and now have read only filesystem

Hello,
I have recently had to reset a locked root password by booting from cdrom, mounting the first boot disk, editing the shadow file to remove root's password and rebooting the system.
The system has booted OK but, I now have a read only filesystem - everything in / cannot be edited, passwd doesnt work etc.
df -k shows the root (/) filesystem has been mounted on the physical disk I edited:
Filesystem kbytes used avail capacity Mounted on
/pci@83,4000/FJSV,ulsa@2,1/disk@0,0:a 10085836 185862 9799116 2% /
but in the vfstab it still references the disksuite metadevice:
#device device mount FS fsck mount mount
#to mount to fsck point type pass at boot options
/dev/md/dsk/d30 /dev/md/rdsk/d30 / ufs 1 no -
So, can I simply boot from CDROM again, amend the vfstab to be /dev/dsk/c0t0d0s0 (instead of /dev/md/dsk/d03) and reboot?
Any help with this is appreciated!
Thanks,
Emma

df -k should have shown root mounted on md0
e.g. on my machine
# df -k
Filesystem kbytes used avail capacity Mounted on
/dev/md/dsk/d0 8260691 4366317 3811768 54% /
what does /etc/system show for rootdev?
# grep rootdev /etc/system
* rootdev: Set the root device. This should be a fully
* rootdev:/sbus@1,f8000000/esp@0,800000/sd@3,0:a
rootdev:/pseudo/md@0:0,0,blk
Remember if this is a mirrored drive, when you boot from CD you may need to mount both sides of the mirror and make changes on both sides- otherwise the replication may not goes as expected.
Actually, I have run into problems with the modifying one side of a mirror this way. In the past Sun tech support would recommend that I break the mirror and then rebuild it once the system is up and running. So in your case you may want to boot from CD, mount the 1st disk slice, edit /etc/vfstab AND /etc/system, boot into the OS and use the various meta commands to delete and rebuild the mirror- or at least maybe to drop and reattach the 2nd 1/2 of the mirror.

Forget unix root password

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