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Configuring serial terminal in RHEL 7
To configure serial terminal in RHEL 7:
1. Add, or update the following lines to /etc/default/grub:
GRUB_CMDLINE_LINUX_DEFAULT="console=tty0 console=ttyS0,115200n8"
GRUB_TERMINAL="console serial"
GRUB_SERIAL_COMMAND="serial --speed=115200 --unit=0 --word=8 --parity=no --stop=1"
GRUB_CMDLINE_LINUX_DEFAULT applies this configuration only to the default menu entry, use GRUB_CMDLINE_LINUX
to apply it to all the menu entries.
Each line should only appear once within the /etc/default/grub. If the line already exists, then modify it to avoid
another copy. Therefore, only one GRUB_CMDLINE_LINUX_DEFAULT line is allowed.
2. Rebuild the /boot/grub2/grub.cfg configuration file by running the grub2-mkconfig -o command as follows:
● on BIOS-based systems:
~]# grub2-mkconfig -o /boot/grub2/grub.cfg
● on UEFI-based systems:
~]# grub2-mkconfig -o /boot/efi/EFI/redhat/grub.cfg
For more information, see the RHEL 7 System Administrator's Guide at redhat.com.
Controlling GRUB from serial console
You can configure GRUB to use the serial console instead of the VGA console. This allows you to interrupt the boot process and
choose a different kernel or add kernel parameters, for example, to boot into single user mode.
Setting up iDRAC communication
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