Linux Install VirtualBox
添加源：cd /etc/yum.repos.d
wget http://download.virtualbox.org/virtualbox/rpm/rhel/virtualbox.repo
下面3个已经安装过了：
yum install dkms
yum groupinstall "Development Tools"
yum install kernel-devel
安装：
yum install VirtualBox-4.3
手动下载：
http://download.virtualbox.org/virtualbox/rpm/el/6/x86_64/VirtualBox-4.3-4.3.8_92456_el6-1.x86_64.rpm
安装：
rpm -ivh VirtualBox-4.3-4.3.8_92456_el6-1.x86_64.rpm
添加到组：
usermod -a -G vboxusers root
资料：
http://wiki.centos.org/zh/HowTos/Virtualization/VirtualBox
http://sourceforge.net/projects/phpvirtualbox/
压缩硬盘：
D:\Program Files\Oracle\VirtualBox>vboxmanage modifyhd "E:\VirtualBox VMs\win_3.1\win_3.1.vdi" --compact
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