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Archive for December, 2011

Forgot root password for Sunsolaris 10, No Worries !

Posted by Hendry chinnapparaj on December 5, 2011

Problem: you are running sun solaris 10 operating system and have forgotten your root password. Assume you have a sun os running in vmware and stuck


Boot the Sun Solaris in “SOLARIS FAILSAFE” Mode. By default it enters as single user mode.

This will look for the currently installed Solaris OS on your system and prompts a Yes/No question to mount the Root filesystem as a Read/Write file system onto /a.

Select yes to mount the root file system (/dev/dsk/c0t0d0s0 here) on/a. If you select No, no harm as you still can mount it manually using:

mount /dev/dsk/c0t0d0s0 /a

NOTE: /a is a temporary mount point that is available when you boot from CD or a JumpStart server

Now, with the root file system mounted on /a. All you need to do is to edit the shadow file and remove the encrypted password for root.

# vi /a/etc/shadow



# vi /etc/passwd



# reboot

Now Login using root without password and change the password as below

# passwd root

Now test by Rebooting again and logging in with the new password









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