centos 7 install virtualbox

from:https://wiki.centos.org/HowTos/Virtualization/VirtualBox

Installing VirtualBox

cd /etc/yum.repos.d
wget http://download.virtualbox.org/virtualbox/rpm/rhel/virtualbox.repo

yum --enablerepo=epel install dkms

yum install VirtualBox-5.1

 Making USB Work in VirtualBox

mkdir /vbusbfs
echo "none /vbusbfs usbfs rw,devgid=$(awk -F : '/vboxusers/ {print $3}' /etc/group),devmode=664 0 0" >> /etc/fstab
mount -a