Edit “/etc/sysconfig/grub”
Add to end of GRUB_CMD_LINELINUX, “console=ttyS0” Replace ttyS0 with your serial port.
Mine looks like this:
GRUB_TIMEOUT=5 GRUB_DEFAULT=saved GRUB_DISABLE_SUBMENU=true GRUB_TERMINAL_OUTPUT="console" GRUB_CMDLINE_LINUX="rd.lvm.lv=centos/root rd.lvm.lv=centos/swap crashkernel=auto rhgb quiet console=ttyS0" GRUB_DISABLE_RECOVERY="true"
Run the following commands as root: Again replace ttyS0 with your serial port
stty -F /dev/ttyS0 speed 9600 grub2-mkconfig -o /boot/grub2/grub.cfg systemctl start getty@ttyS0