vim /etc/yum.repos.d/virtualbox.repo

[virtualbox] name=Oracle Linux / RHEL / CentOS-$releasever / $basearch - VirtualBox baseurl=http://download.virtualbox.org/virtualbox/rpm/el/$releasever/$basearch enabled=1 gpgcheck=1 gpgkey=http://download.virtualbox.org/virtualbox/debian/oracle_vbox.asc

CentOS/RHEL 7, 64 Bit (x86_64):

rpm -Uvh http://ftp.jaist.ac.jp/pub/Linux/Fedora/epel/7/x86_64/e/epel-release-7-5.noarch.rpm

CentOS/RHEL 6, 32 Bit (i386):

rpm -Uvh http://download.fedoraproject.org/pub/epel/6/i386/epel-release-6-8.noarch.rpm

CentOS/RHEL 6, 64 Bit (x86_64):

rpm -Uvh http://download.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm

CentOS/RHEL 5, 32 Bit (i386):

rpm -Uvh http://dl.fedoraproject.org/pub/epel/5/i386/epel-release-5-4.noarch.rpm

CentOS/RHEL 5, 64 Bit (x86_64):

rpm -Uvh http://dl.fedoraproject.org/pub/epel/5/x86_64/epel-release-5-4.noarch.rpm

yum install gcc make patch dkms qt libgomp -y

yum install kernel-headers kernel-devel fontforge binutils glibc-headers glibc-devel -y

export KERN_DIR=/usr/src/kernels/2.6.32-504.3.3.el6.x86_64

yum install VirtualBox-5* service vboxdrv setup