4.7. Changing boot entries with the GRUB configuration file

Procedure

1. Add or remove a kernel parameter for individual kernels in a post installation script with grubby:

   # grubby --update-kernel <PATH_TO_KERNEL> --args "<NEW_ARGUMENTS>"

   For example, add the noapic parameter to the chosen kernel:

   # grubby --update-kernel /boot/vmlinuz-6.12.0-0.el10_0.x86_64 --args "noapic"

   The parameter is propagated into the BLS snippets, but not into the /etc/default/grub file.

2. Overwrite BLS snippets with the contents of the GRUB_CMDLINE_LINUX values present in the /etc/default/grub file:

   # grub2-mkconfig -o /boot/grub2/grub.cfg --update-bls-cmdline
   Generating grub configuration file …​
   Adding boot menu entry for UEFI Firmware Settings …​
   done

   注意

   Other changes, such as changes made to GRUB_TIMEOUT key (also included in the /etc/default/grub GRUB configuration file) are propagated to the new grub.cfg file by executing grub2-mkconfig command.

Verification

1. Reboot your system.

2. Verify that the parameters are included in the /proc/cmdline file.

   For example, if you added the noapic:

   BOOT_IMAGE=(hd0,gpt2)/vmlinuz-6.12.0-0.el10_0.x86_64 root=/dev/mapper/RHELCSB-Root ro vconsole.keymap=us crashkernel=2G-64G:256M,64G-:512M rd.lvm.lv=RHELCSB/Root rd.luks.uuid=luks-d8a28c4c-96aa-4319-be26-96896272151d rhgb quiet noapic rd.luks.key=d8a28c4c-96aa-4319-be26-96896272151d=/keyfile:UUID=c47d962e-4be8-41d6-8216-8cf7a0d3b911 ipv6.disable=1