With kernel command-line parameters, you can overwrite default values and set specific hardware settings. At boot time, you can configure the Red Hat Enterprise Linux kernel, the initial RAM disk, and user space features.

By default, the kernel command-line parameters for systems by using the GRUB boot loader are defined in the boot entry configuration file for each kernel boot entry.

You can manipulate boot loader configuration files by using the grubby utility. With grubby, you can perform these actions:

• Change the default boot entry.
• Add or remove arguments from a GRUB menu entry.