How To Update CentOS Kernel

The recommended system for Shield is Ubuntu 18.04. It may be installed on CentOS, but this is not the best practice for Shield.

When using CentOS, the Kernel should be updated to 4.4.

To update the kernal, follow these steps:

1. Check the current kernel version:

   uname –msr
   

2. Update CentOS repositories:

   sudo yum –y update
   

3. Enable the ELRepo repository:

   sudo rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
   sudo rpm -Uvh http://www.elrepo.org/elrepo-release-7.0-3.el7.elrepo.noarch.rpm
   

4. List available kernels:

   yum list available --disablerepo='*' --enablerepo=elrepo-kernel
   

5. Install the new kernel version to 4.4.203-LT (LT signifies a stable long-term support release)

   sudo yum –enablerepo=elrepo-kernel install kernel-lt

6. Reboot and select the new kernel. After the machine is rebooted you can select the new kernel from a list (using the arrows) - then press Enter.

7. Verify the machine functions as usuall

8. Set the default kernel version:

   sudo vim /etc/default/grub
   

   Search for the line that says GRUB_DEFAULT=X*, and change it to GRUB_DEFAULT=0* (zero). Save. Recreate the kernel configuration:

   sudo grub2-mkconfig -o /boot/grub2/grub.cfg
   

9. Reboot once more.

To continue with the requirements, go here.