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Install the native kernel on a CentOS 6 and Newer Linode
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| ### Starting from a fresh CentOS 6 or newer Linode | |
| ### Enable the native kernel to boot from pvgrub | |
| ### It will autoconfigure itself with each yum update. | |
| ### This is adapted from a previous script for CentOS 5.5 found here: | |
| ### http://www.linode.com/docs/assets/542-centos5-native-kernel-selinux-enforcing.sh | |
| ### Provided via the linode wiki | |
| ### https://www.linode.com/docs/tools-reference/custom-kernels-distros/run-a-distributionsupplied-kernel-with-pvgrub#centos-5 | |
| ### Provided without warranty, although since it should only be run | |
| ### on first box build if your box gets broken simply rebuild it | |
| mkdir /boot/grub/ | |
| DISTRO_PLATFORM=`uname -p` | |
| AWK_VERSION_MATCH="{if(\$1==\"kernel.$DISTRO_PLATFORM\") print \$2}" | |
| KERNEL_VERSION=`yum -q list kernel | awk "$AWK_VERSION_MATCH"` | |
| ### Write template grub.conf | |
| cat > /boot/grub/grub.conf << EOF | |
| # grub.conf generated by anaconda | |
| # | |
| # Note that you do not have to rerun grub after making changes to this file | |
| # NOTICE: You have a /boot partition. This means that | |
| # all kernel and initramfs paths are relative to /boot/, eg. | |
| # root (hd0) | |
| # kernel /boot/vmlinuz-version ro root=/dev/xvda | |
| # initrd /boot/initramfs-version.img | |
| #boot=/dev/xvda | |
| default=0 | |
| timeout=3 | |
| title CentOS ($KERNEL_VERSION.$DISTRO_PLATFORM) | |
| root (hd0) | |
| kernel /boot/vmlinuz-$KERNEL_VERSION.$DISTRO_PLATFORM root=/dev/xvda | |
| initrd /boot/initramfs-$KERNEL_VERSION.$DISTRO_PLATFORM.img | |
| EOF | |
| ln -s /boot/grub/grub.conf /boot/grub/menu.lst | |
| yum -y install kernel | |
| if [ $? -ne 0 ]; then | |
| echo "ERROR aborting..." | |
| exit 1 | |
| fi |
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As far as the above is concerned. Linode themselves now provide a couple of guides:
CentOS 6 with GRUB (Legacy): https://linode.com/docs/tools-reference/custom-kernels-distros/use-the-distribution-supplied-kernel-on-centos-6-with-grub-legacy/
CentOS 7+ using GRUB 2 on KVM host: https://linode.com/docs/tools-reference/custom-kernels-distros/run-a-distribution-supplied-kernel-with-kvm/
I'd encourage you to use GRUB 2 instead of this if you're using CentOS 7+ on a KVM host (most likely on KVM after the Meltdown / Spectre issues)