Build and installs vanilla kernel on CentOS 6. You can specify a version with `$VERSION` environment variable.

install_kernel.sh

#!/bin/bash

set -e

export PATH=/sbin:/bin:/usr/sbin:/usr/bin
export LANG=C

if [ $UID -ne 0 ] ; then
  echo "You must be root to run this script."
  exit 1
fi

if [ "x$VERSION" == "x" ] ; then
  VERSION="3.17.1"
fi

yum -y groupinstall 'Development Tools'
yum -y install bc wget

cd /usr/local/src
wget https://www.kernel.org/pub/linux/kernel/v3.0/linux-${VERSION}.tar.gz

tar zxf linux-${VERSION}.tar.gz
cd linux-${VERSION}

cp /boot/config-$(uname -r) .config
yes "" | make oldconfig >/dev/null

make -j $(nproc) all

make modules_install
make install

echo "Change boot order in /boot/grub/grub.conf and reboot machine."

exit 0