First of all: Update your VM:
sudo su - root
cat /etc/redhat-release
yum check-update
yum update kernel*
yum update
reboot
Verify your new kernel:
cat /etc/redhat-release
Create DIR on witch mount VirtualBoxCD:
mkdir /media/VirtualBox_tools
mount -r /dev/cdrom /media/VirtualBox_tools
add Rep:
rpm -Uvh https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
Install serious stuff:
yum install gcc kernel-devel kernel-headers dkms make bzip2 perl
KERN_DIR=/usr/src/kernels/`uname -r`
KERN_DIR=/usr/src/kernels/3.10.0-693.17.1.el7-x86_64/build
export KERN_DIR
cd /media/VirtualBoxGuestAdditions
./VBoxLinuxAdditions.run
reboot
enjoy Virtual_centOS7
.glitchlist crew