Set Default Kernel with Grub

A

adresner

Member
Mar 22, 2023
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I'm getting mixed signals.
Found this: https://forum.proxmox.com/threads/select-default-boot-kernel.79582/post-398029
But
Also found this: https://pve.proxmox.com/wiki/Host_Bootloader#sysboot_kernel_pin
Even found this guy
https://www.youtube.com/watch?v=NU4oE1_huC4

Currently booting 6.2.9-1 which killed my hardware transcoding with my 13th Gen Intel. Manually rolled back to 6.2.6-1 and all good again. Would appreciate some guidance as I have never done this before and don't want to bork my install. Thank you
 
Last edited:
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That does help, so at least I can focus on the official solution until the kernel and my new hardware are old friends.

Organizing some steps:

Code: 
grep menu /boot/grub/grub.cfg

if [ x"${feature_menuentry_id}" = xy ]; then
menuentry_id_option="--id"
menuentry_id_option=""
export menuentry_id_option
set timeout_style=menu
set menu_color_normal=cyan/blue
set menu_color_highlight=white/blue
menuentry 'Proxmox VE GNU/Linux' --class proxmox --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-simple-f99e4a6b-b6bf-473c-9780-6031fcda1048' {
submenu 'Advanced options for Proxmox VE GNU/Linux' $menuentry_id_option 'gnulinux-advanced-f99e4a6b-b6bf-473c-9780-6031fcda1048' {
menuentry 'Proxmox VE GNU/Linux, with Linux 6.2.9-1-pve' --class proxmox --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-6.2.9-1-pve-advanced-f99e4a6b-b6bf-473c-9780-6031fcda1048' {
menuentry 'Proxmox VE GNU/Linux, with Linux 6.2.9-1-pve (recovery mode)' --class proxmox --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-6.2.9-1-pve-recovery-f99e4a6b-b6bf-473c-9780-6031fcda1048' {
menuentry 'Proxmox VE GNU/Linux, with Linux 6.2.6-1-pve' --class proxmox --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-6.2.6-1-pve-advanced-f99e4a6b-b6bf-473c-9780-6031fcda1048' {
menuentry 'Proxmox VE GNU/Linux, with Linux 6.2.6-1-pve (recovery mode)' --class proxmox --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-6.2.6-1-pve-recovery-f99e4a6b-b6bf-473c-9780-6031fcda1048' {
menuentry 'Proxmox VE GNU/Linux, with Linux 5.15.104-1-pve' --class proxmox --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-5.15.104-1-pve-advanced-f99e4a6b-b6bf-473c-9780-6031fcda1048' {
menuentry 'Proxmox VE GNU/Linux, with Linux 5.15.104-1-pve (recovery mode)' --class proxmox --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-5.15.104-1-pve-recovery-f99e4a6b-b6bf-473c-9780-6031fcda1048' {
menuentry 'Proxmox VE GNU/Linux, with Linux 5.15.102-1-pve' --class proxmox --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-5.15.102-1-pve-advanced-f99e4a6b-b6bf-473c-9780-6031fcda1048' {
menuentry 'Proxmox VE GNU/Linux, with Linux 5.15.102-1-pve (recovery mode)' --class proxmox --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-5.15.102-1-pve-recovery-f99e4a6b-b6bf-473c-9780-6031fcda1048' {
menuentry "Memory test (memtest86+)" {
menuentry "Memory test (memtest86+, serial console 115200)" {
menuentry "Memory test (memtest86+, experimental multiboot)" {
menuentry "Memory test (memtest86+, serial console 115200, experimental multiboot)" {
menuentry 'UEFI Firmware Settings' $menuentry_id_option 'uefi-firmware' {
# This file provides an easy way to add custom menu entries. Simply type the
# menu entries you want to add after this comment. Be careful not to change


I am booting

menuentry 'Proxmox VE GNU/Linux, with Linux 6.2.9-1-pve' --class proxmox --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-6.2.9-1-pve-advanced-f99e4a6b-b6bf-473c-9780-6031fcda1048' {

But I want to boot

menuentry 'Proxmox VE GNU/Linux, with Linux 6.2.6-1-pve' --class proxmox --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-6.2.6-1-pve-advanced-f99e4a6b-b6bf-473c-9780-6031fcda1048' {

nano /etc/default/grub

GRUB_DEFAULT=0
GRUB_TIMEOUT=5
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_CMDLINE_LINUX_DEFAULT="quiet"
GRUB_CMDLINE_LINUX="quiet intel_iommu=on iommu=pt"

Edit the 4th line
From:
GRUB_CMDLINE_LINUX_DEFAULT="quiet"
To:
???????
My guess:
GRUB_CMDLINE_LINUX_DEFAULT=“gnulinux-6.2.6-1-pve-advanced-f99e4a6b-b6bf-473c-9780-6031fcda1048”

Lastly run update-grub

Reboot and hold breath

I can’t seem to find on google or in the forums an example
 
I mistyped before. The section is 3.12.7. All you need to do is run proxmox-boot-tool kernel pin 6.2.6-1-pve as root if you want to pin the 6.2.6-1 kernel. (To find other kernels you have installed and which ones are available to download you can run apt list | grep pve-kernel.)
On reboot, grub will select the "advanced options" tab and directly boot into the kernel you pinned.

For future help: If you want to test things in proxmox but do not want to risk borking your system, you can set up a Proxmox VM inside of your Proxmox and try them there (see also the nested virtualization section in our wiki [1])

adresner said:
A little help here please?
Click to expand...
I don't work Wednesdays. If you need time-critical responses you can get a subscription [2].
[1]: https://pve.proxmox.com/wiki/Nested_Virtualization
[2]: https://www.proxmox.com/en/proxmox-ve/pricing
 
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I'm considering the subscription as I build out and test, coming over from UNRAID

That seems easy enough, thank you !
 
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