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I have RedHat Enterprise Linux Server 7, with kernel: 3.10.0-514 and I downloaded the linux kernel version 4.12.10 and I compile it and configure it without having any error here are the commands I executed:

make mrproper
make dep
make clean
make  bzImage 
make modules
make modules_install

the execution was done without errors. then I copied the file System.map to /boot folder, executing:

cp System.map /boot/System.map-4.12.10

and then

cp arch/x86_64/boot/bzImage /boot/bzImage-4.12.10

But when I retstart the OS, I do not have the option to load the new kernel.

Any help please ?

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  • 1
    grub also has to be configured Sep 4 '17 at 19:29
  • Did you update your boot loader with the new image? Also, you will have to generate a new initramfs, if you are using one.
    – Munir
    Sep 4 '17 at 19:30
  • No I did not how can I do this ?
    – rainman
    Sep 4 '17 at 19:34
  • Recreating the initramfs might be important as well before reconfiguring grub.. mkinitrd /boot/initramfs-<kernel-version>.img <kernel-version>, where <kernel-version> is the folder from /lib/modules.
    – Thomas
    Sep 4 '17 at 19:40
  • @Thomas done with success, now what shoul I do to reconfigure the grub ?
    – rainman
    Sep 4 '17 at 19:57
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Update your initramfs first :

sudo update-initramfs -c -k <kernel name>

For Rhel :

dracut -f -v /boot/<kernel name>

And then update your grub :

sudo update-grub

For Rhel:

grub2-mkconfig -o /boot/efi/EFI/redhat/grub.cfg ##For BIOS based machines.
grub2-mkconfig -o /boot/grub2/grub.cfg #For UEFI based machines.
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  • these commands do not work in redhat
    – rainman
    Sep 4 '17 at 20:52
  • @rainman Updated answer for Rhel. Sep 4 '17 at 20:57

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