Document or remove qcow2 VM image /etc/grub2-efi.cfg symbolic link

[vincentmli]

Proposal

General Information

openEuler-21.09-x86_64.qcow2.xz KVM image has /etc/grub2-efi.cfg that is symbolic link to /boot/grub2/efi/EFI/openEuler/grub.cfg, users might need to use grubby to change kernel boot parameters like below

grubby --grub2 --args="apparmor=0" --remove-args="rhgb quiet" --update-kernel /boot/vmlinuz-5.10.0-5.10.0.24.oe1.x86_64

to run light weight k3s kubernetes cluster due to k3s issue rancher/k3os#702, but above grubby command only changed /etc/grub2-efi.cfg, ignored /etc/grub2.cfg which is symbolic link to /boot/grub2/grub.cfg that the VM will actually use unless users specifically configured VM to use EFI to boot the VM https://fedoraproject.org/wiki/Using_UEFI_with_QEMU, which I think most of users don't do that.

https://docs.fedoraproject.org/en-US/fedora/rawhide/system-administrators-guide/kernel-module-driver-configuration/Working_with_the_GRUB_2_Boot_Loader/#sec-Making_Persistent_Changes_to_a_GRUB_2_Menu_Using_the_grubby_Tool

I recommend to either remove /etc/grub2-efi.cfg or maybe documents it somewhere about how to change the VM kernel boot parameter according to if EFI configured or not in VM qemu.

How to reproduce the issue

1. Download https://repo.openeuler.org/openEuler-21.09/virtual_machine_img/x86_64/openEuler-21.09-x86_64.qcow2.xz and ran the openEuler image in KVM,

2. grubby --grub2 --args="apparmor=0" --remove-args="rhgb quiet" --update-kernel /boot/vmlinuz-5.10.0-5.10.0.24.oe1.x86_64

3. reboot

4. cat /proc/cmdline to check if kernel has "apparmor=0" set

[Yikun]

hi, thanks for the feedback, this is only a mirror repo, pls see https://gitee.com/openeuler/community

[vincentmli]

@Yikun

Yes i am aware of https://gitee.com/openeuler/community, but it appears only for Chinese audience who can read Chinese, what about reaching to users who can't read Chinese? I hope openEuler can reach to users can't read Chinese.

[Yikun]

@vincentmli You can switch language to English at right and end of page. I can also help to cherry pick this issue to gitee.

[Yikun]

https://gitee.com/openeuler/community/issues/I4L2HE