sudo yum -y update
cd /opt
sudo wget -c http://download.virtualbox.org/virtualbox/4.3.4/VBoxGuestAdditions_4.3.4.iso -O VBoxGuestAdditions_4.3.4.iso
sudo mount VBoxGuestAdditions_4.3.4.iso -o loop /mnt
cd /mnt
sudo sh VBoxLinuxAdditions.run --nox11
cd /opt
sudo rm *.iso
sudo /etc/init.d/vboxadd setup
sudo chkconfig --add vboxadd
sudo chkconfig vboxadd on
exit
$ vagrant halt
$ vagrant up
$ vagrant halt
$ vagrant package
$ mv package.box centos-6.3.box