HOWTO reset CentOS or RHEL root password
* Shutdown
# poweroff
* Restart
‘e’dit and navigate to second grub.conf line (kernel) and ‘e’dit the second line of the ‘grub’ bootloader to
append <SPACE> 1 (” 1″) to the end of the line
* or
append <SPACE> S (” S”) to the end of the line
* or
append “single” to ro root=LABEL=/ single
enter press ‘b’oot to boot
* Reset Root Password
# passwd
* Shutdownn
# poweroff
Restart
Normally
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