How to Install Kernel 5.18 From Source on CentOS 8

Installing

5. 5. Configuring Kernel

   So now to Configure CentOS Linux Custom Kernel
   First, access the Kernel Source with:

   cd linux*

   Then copy the current Configuration File into the New Kernel Source:

   sudo find /boot/ \( -iname "*config*" -a -iname "*`uname -r`*" \) -exec cp -i -t ./ {} \;

   mv *`uname -r`* .config

   This mystics because the default Configuration File may have a variable composition including “config” and the Kernel Version.
   In case of a Chrooted System instead you may look up the available Kernels with:

   ls /boot | grep config

   The grep Command refine the output List showing only the entries Matching the Keyword.
   Again fix the Configuration File editing it with nano and commenting out like:

   sudo nano .config

   Use Ctrl+w to search for “CONFIG_SYSTEM_TRUSTED_KEYS” on nano.
   And comment out the Line like:

   #CONFIG_SYSTEM_TRUSTED_KEYS="certs/rhel.pem"

   Ctrl+x to Save & Exit.
   Else to make a Custom one then reconfigure the Kernel (Only for advanced Users) with:

   sudo make menuconfig

   For instructions see: How to Configure a Build Kernel.

6. 6. Building Kernel

   Next to Build CentOS Custom Linux Kernel
   Make it with:

   sudo make clean

   And then:

   sudo make rpm-pkg

   When prompted if uncertain then simply follow to hit Enter until the end.

   

   Then think to other task to follow because the process will take about a couple of Hours…
   Last, to check the builded Images play:

   sudo ls /root/rpmbuild/RPMS/x86_64/ | grep kernel

   

7. 7. Installing Kernel

   Finally, to Install CentOS Linux Custom Kernel
   Simply play:

   sudo su -c "dnf in /root/rpmbuild/RPMS/x86_64/kernel*.rpm"

   And this setup includes also the Custom Kernel Headers that you don’t will find online. :)

   

   And finally reboot with:

   sudo reboot now

   Finally, you should boot into your barely new CentOS Linux Kernel :)
   To check it run:

   uname -r

   And in case of Issue you still can choose the previous one on the GRUB Splash Screen!

8. 8. Updating Firmware

   How to Update Linux Devices Firmware on GNU/Linux

   Updating Firmware Guide

   How to Install Linux Git Firmware on GNU/Linux

   Especially relevant: this setup is optional and may be required only to make use of some New Device Drivers not available in your current Firmware.