12.6. How kernel arguments change after the installation with kargs.d

The changes that you make to kargs.d files and include in a container build are applied after the installation, and the difference between the set of kernel arguments is applied to the current boot loader configuration. This preserves any machine-local kernel arguments.

You can use any tool to edit the /boot/loader/entries files, which are in a standardized format. The /boot file has read-only access to limit the set of tools that can write to this filesystem.