centos 安装虚拟机+win7

添加 virtulbox源
cd /etc/yum.repos.d 
wget http://download.virtualbox.org/virtualbox/rpm/rhel/virtualbox.repo
添加rpmforge源（failed 也行）
cd
wget http://pkgs.repoforge.org/rpmforge-release/rpmforge-release-0.5.2-1.el6.rf.x86_64.rpm 
rpm -ivh rpmforge-release-0.5.2-1.el6.rf.x86_64.rpm
安装依赖
yum --enablerepo rpmforge install dkms 
yum groupinstall "Development Tools"
yum install kernel-devel
安装virtualbox
yum install VirtualBox-5.2
运行 VirtualBox &