close
remove root password
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vi /etc/shadow
root:xx:
xx = your password
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Create autologin file in RHEL / CentOS 6
vi /autologin #you can choose your own path
exec /bin/login -f root
modify autologin file
chmod 777 /autologin
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vi /etc/init/serial.conf
comment out exec line
#exec /sbin/agetty /dev/$DEV xxxxxxxxx..........
exec /sbin/agetty -n -l /autologin 57600 ttyS0
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