Including parameters for modules in a boot configuration

Edit online

Red Hat Enterprise Linux 8.6 LPAR mode z/VM guest KVM guest

Parameters for modules that are required early during the boot process must be included in the boot configuration.

About this task

Red Hat® Enterprise Linux® 8.6 uses an initial file system (initramfs) when booting. The initramfs does not contain device specifications. Instead, it takes parameters from dracut during the boot process. dracut obtains the parameters by parsing the kernel parameter line for parameters with an rd. prefix.

Anaconda writes information about devices that must be accessible during the boot process to zipl.conf for you. An example is the device with the root file system.

Procedure

Follow these steps to provide parameters on a kernel command line to be evaluated, for example, by dracut:
  1. With an rd. prefix, specify the parameters in zipl.conf. For example, to specify a DASD, use rd.dasd=. The parameters are lower case and are case-sensitive. See the dracut man page, dracut.cmdline(7), for more details about parameters with an rd. prefix.
  2. Run zipl to include the new parameter line in your boot configuration.