FC 11 Boot mode single user [recovery password]

[Phil Meyer]

On 08/10/2009 04:39 PM, suvayu ali wrote:
> 2009/8/10 Jerry Feldman<gaf at blu.org>:
>    
>> On 08/10/2009 09:01 AM, Tiago Araujo wrote:
>>      
>>> Dear,
>>>
>>> I need recovery password in FC 11.
>>>
>>>
>>>        
>> There is none. The best way to recover a lost root password is to boot
>> the installation media, the root file system should be mounted on
>> /mnt/sysimage, but if it is not, you can mount it by hand.
>>
>> The use the chroot(8) command  to set /mnt/sysimage as your root, then
>> use the passwd(1) command to change the password, then to be safe,
>> unmount /mnt/sysimage.
>>
>> Example:
>> (if the root file system is not mounted: mount /dev/sda2 /mnt/sysimage
>> (assuming this is where root is) )
>> chroot /mnt/sysimage
>> passwd
>> -->you will be prompted
>> umount /mnt/sysimage
>>
>> The reboot. The umount is very important.
>>      
>
> Just for knowledge's sake, why is the umount so important?
>
>    

A umount will force a flush of the file system's buffers, thus making 
sure that your changes are saved.

If you exit gracefully from single user, this should happen as a matter 
of course, but not everyone will exit gracefully from single user or 
rescue mode.

Plus, you may want to do more than one thing in recovery mode, and this 
step reminds you to 'save your work'.

Good Luck!