■参考URL:http://qiita.com/wakaba260/items/b5c87b7815b710f303a0
1.sudo yum -y update kernel
2.sudo yum -y install kernel-devel kernel-headers dkms gcc gcc-c++
3.export KERN_DIR=ls -t /usr/src/kernels/|head -1
4.サーバー再起動
5.sudo /etc/init.d/vboxadd setup