On Tue, 31 Aug 2021 18:44:44 +0200
Gueven Bay via users <users@xxxxxxxxxxxxxxxxxxxxxxx> wrote:
> Yes, this file exists BUT in every grub2 tutorial and also in this
> file itself at the top it is written that you should not edit this
> file directly.
I think that for what you want to do, editing is fine. I've edited
that file in the past to change the kernel command line, and it worked
fine. I think the warning is there so that people won't think that any
changes they make there instead of in the /etc/default/grub file will
be permanent. The command line changes will hold until you run
grub2-mkconfig again, and then they will be overwritten in the new
grub.cfg by what is in /etc/default/grub. Installing a new kernel
won't override them, as program grubby copies the options from the
previous kernel to the new kernel during the install.
> No, Sir. These are the only lines in my /etc/default/grub :
> GRUB_TIMEOUT=5
> GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)"
> GRUB_DEFAULT=saved
> GRUB_DISABLE_SUBMENU=true
> GRUB_TERMINAL_OUTPUT="console"
> GRUB_CMDLINE_LINUX="resume=UUID=583baa2f-645c-4a12-99a1-f595ef664aa5
> rhgb quiet" GRUB_DISABLE_RECOVERY="true"
If you edit this line, and add the options you want at the end of the
line, separated by a space, and then run grub2-mkconfig, they will be
set on all your installed kernels.
> GRUB_ENABLE_BLSCFG=true
>
> But I want to change the "linux" and "initrd" lines in the grub menu
The GRUB_CMDLINE_LINUX sets the linux command line options. The
options available are in the kernel documentation. You should be able
to look them up at kernel.org. I am not sure how to change the initrd
line via grub, as I have never done it.
I see these options in the kernel documentation:
bootconfig [KNL]
Extended command line options can be added to
an initrd and this will cause the kernel to look for it.
See Documentation/admin-guide/bootconfig.rst
initrd= [BOOT] Specify the location of the initial ramdisk
initrdmem= [KNL] Specify a physical address and size from
which to load the initrd. If an initrd is compiled in or
specified in the bootparams, it takes priority
over this setting.
Format: ss[KMG],nn[KMG]
Default is 0, 0
> entry! I do not see any way to change them in /etc/default/grub.
> And as I try to make it clear, I cannot see which of the scripts under
> /etc/grub.d/ I should change to change these two grub commands.
>
> Where - if I should and must not edit the grub.cfg - can I change
> these lines so that I can give the kernel other boot parameters?
As above or you can edit the grub.cfg file if you understand the
shortcomings, that it will be overwritten with the options in
/etc/default/grub whenever you run grub2-mkconfig.
If you want to use the custom sections of the grub.cfg file, you would
put your entries in the appropriate file in /etc/grub.d and then run
grub2-mkconfig so that they will be picked up.
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