Re: grubby --set-default LOLs at me

Sunday, 8 January 2023

On 08/01/2023 01:40, Sam Varshavchik wrote:
...
 Can anyone try using grubby --set-default to change the default boot

 kernel to something other than the most recently-installed kernel, 
 successfully?

 It tells me that it obeys my request, and grubby --info=DEFAULT shows 
 that the default boot kernel is what I specified.

 But at boot the grub menu still highlights the most recently installed 
 kernel, and that's what boots by default. 
What I do is this;

[root@armf37 ~]# grubby --info=ALL
index=0
kernel="/boot/vmlinuz-6.0.17-300.fc37.aarch64"
args="ro rootflags=subvol=root rhgb quiet"
root="UUID=2b7a3341-3b66-42c2-bc12-6c4d58c58957"
initrd="/boot/initramfs-6.0.17-300.fc37.aarch64.img"
title="Fedora Linux (6.0.17-300.fc37.aarch64) 37 (KDE Plasma)"
id="ce79604f5b5945f28b6a37ac66f4ffc4-6.0.17-300.fc37.aarch64"
index=1
kernel="/boot/vmlinuz-6.0.16-300.fc37.aarch64"
args="ro rootflags=subvol=root rhgb quiet"
root="UUID=2b7a3341-3b66-42c2-bc12-6c4d58c58957"
initrd="/boot/initramfs-6.0.16-300.fc37.aarch64.img"
title="Fedora Linux (6.0.16-300.fc37.aarch64) 37 (KDE Plasma)"
id="ce79604f5b5945f28b6a37ac66f4ffc4-6.0.16-300.fc37.aarch64"
index=2
kernel="/boot/vmlinuz-0-rescue-ce79604f5b5945f28b6a37ac66f4ffc4"
args="ro rootflags=subvol=root rhgb quiet"
root="UUID=2b7a3341-3b66-42c2-bc12-6c4d58c58957"
initrd="/boot/initramfs-0-rescue-ce79604f5b5945f28b6a37ac66f4ffc4.img"
title="Fedora Linux (0-rescue-ce79604f5b5945f28b6a37ac66f4ffc4) 36 (KDE 
Plasma)"
id="ce79604f5b5945f28b6a37ac66f4ffc4-0-rescue"

Then I pick the kernel by index, because its easier to type:

[root@armf37 ~]# grubby --set-default-index=1

The default is 
/boot/loader/entries/ce79604f5b5945f28b6a37ac66f4ffc4-6.0.16-300.fc37.aarch64.conf 
with index 1 and kernel /boot/vmlinuz-6.0.16-300.fc3
7.aarch64

This has always worked for me.

But in testing this on my f37 upgraded from f36 index 1 flipped to 
booting the f36 5.17 kernel!
That is not in the list above you will notice. I found that 
/boot/grub2/grub.cfg had the 5.17
kernel in a menuentry section becuase of /etc/grub.d/10_linux (?!?!?!)

To fix that I did:

[root@armf37 ~]# grub2-mkconfig -o /boot/grub2/grub.cfg

To remove rhgb and quiet I do this:

[root@armf37 ~]# grubby --update-kernel=ALL --remove-args=rhgb\ quiet
[root@armf37 ~]# grubby --info=ALL
index=0
kernel="/boot/vmlinuz-6.0.17-300.fc37.aarch64"
args="ro rootflags=subvol=root"
root="UUID=2b7a3341-3b66-42c2-bc12-6c4d58c58957"
initrd="/boot/initramfs-6.0.17-300.fc37.aarch64.img"
title="Fedora Linux (6.0.17-300.fc37.aarch64) 37 (KDE Plasma)"
id="ce79604f5b5945f28b6a37ac66f4ffc4-6.0.17-300.fc37.aarch64"
index=1
kernel="/boot/vmlinuz-6.0.16-300.fc37.aarch64"
args="ro rootflags=subvol=root"
root="UUID=2b7a3341-3b66-42c2-bc12-6c4d58c58957"
initrd="/boot/initramfs-6.0.16-300.fc37.aarch64.img"
title="Fedora Linux (6.0.16-300.fc37.aarch64) 37 (KDE Plasma)"
id="ce79604f5b5945f28b6a37ac66f4ffc4-6.0.16-300.fc37.aarch64"
index=2
kernel="/boot/vmlinuz-0-rescue-ce79604f5b5945f28b6a37ac66f4ffc4"
args="ro rootflags=subvol=root"
root="UUID=2b7a3341-3b66-42c2-bc12-6c4d58c58957"
initrd="/boot/initramfs-0-rescue-ce79604f5b5945f28b6a37ac66f4ffc4.img"
title="Fedora Linux (0-rescue-ce79604f5b5945f28b6a37ac66f4ffc4) 36 (KDE 
Plasma)"
id="ce79604f5b5945f28b6a37ac66f4ffc4-0-rescue"

Barry

...

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