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 lineor
append <SPACE> S (" S") to the end of the lineor
append "single" to ro root=LABEL=/ single
enter press 'b'oot to boot
Reset Root Password
# passwd
Shutdownn
# poweroff
Restart
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