4.6. Configuring GRUB settings to enable serial console connection

Procedure

1. Add the following two lines to the /etc/default/grub file:

   GRUB_TERMINAL="serial"
   GRUB_SERIAL_COMMAND="serial --speed=9600 --unit=0 --word=8 --parity=no --stop=1"

   The first line disables the graphical terminal. The GRUB_TERMINAL key overrides values of GRUB_TERMINAL_INPUT and GRUB_TERMINAL_OUTPUT keys.

   The second line adjusts the baud rate (--speed), parity and other values to fit your environment and hardware. Note that a higher baud rate, for example 115200, is preferable for tasks such as following log files.

2. Update the GRUB configuration file:

   # grub2-mkconfig -o /boot/grub2/grub.cfg

   This applies to both, BIOS and UEFI based machines.

3. Reboot the system for the changes to take effect.