How to install VirtualBox Guest additions on Centos7.x

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As root execute the following code

yum install -y make gcc kernel-headers kernel-devel perl dkms bzip2
yum update kernel kernel-headers
reboot now
export KERN_DIR=/usr/src/kernels/$(uname -r)
mount -r /dev/cdrom /media
cd /media/
./VBoxLinuxAdditions.run