Kernel isn't booting once CloudLinux is installed on Dell Servers (AlmaLinux/RockyLinux)

Issue

Your DELL server is unable to boot from UEFI partition once you have converted Almalinux\RockyLinux to CloudLinux.

Environment

• AlmaLinux/RockyLinux
• CloudLinux
• Dell servers (only a few specific Dell servers)

Solution

In case your server is still UP after conversion and you didn't reboot it yet do:

cp -rp /boot/efi/EFI/centos/* /boot/efi/EFI/almalinux/

In case the server is already not booting:

Boot a almalinux8 or centos8 liveCD.In the boot menu, choose Troubleshooting:

Then "Rescue an Almalinux system" or "Rescue a CentOS system" if you are running CentOS live CD:

When requested if system needs to be mounted type "1" and press "Enter"

Press "Enter" again on a prompt to shell:

Type "chroot /mnt/sysroot" end press "Enter":

Type "cp -rp /boot/efi/EFI/centos/* /boot/efi/EFI/almalinux/" press "Enter" and then you can reboot.

Cause

The conversion of Almalinux to Cloudlinux moving bootloader to /boot/efi/EFI/centos directory but on DELL's - new bootloader configuration is not detected on some DELL servers. The root cause is being investigated.