CentOS 7 Install VMBOX Guest

Install prequisite packages first:

1
yum install perl gcc dkms kernel-headers bzip2 make kernel-devel kernel-devel-`uname -r`

Then run the VMBOX guest installer:

1
mount -r /dev/cdrom /mnt
2
/mnt/VBoxLinuxAdditions.run

Restart and be done with it.