Installing VirtualBox

昊漫玉

　　The (VirtualBox) website has a lot of quality documentation including:
　　End-user documentation
Technical documentation
Source code repository timeline
List of changes (changelog)
　　This article will briefly cover the installation process. Both i386 and AMD64 (x86_64) versions are available.
　　You will need to be the root user for the following tasks. Login to a root shell or "su -" in a terminal window.
　　Download the RHEL repo config.
　　Note:As an alternative, you may choose to download and install individual RPMS rather than configuring the repository. That procedure is documented on the VB web site and will not be covered here.
　　cd /etc/yum.repos.d
wget http://download.virtualbox.org/virtualbox/rpm/rhel/virtualbox.repo
　　Optionallyadd a line "enabled=0" if you do not want the repository to be enabled by default. This will require adding "--enablerepo virtualbox" to yum commands to access the repository.
　　The installation of VB will require the building of kernel modules. If DKMS (Dynamic Kernel Module Support) is installed it will be used and will simplify kernel upgrades.Installing DKMS from RPMforge or EPEL repository is recommended before installing VirtualBox. Don't forget to configure the yum-priorities plugin. Installing DKMS will pull in required development dependencies.
　　yum --enablerepo rpmforge install dkms
　　 A forum user notes that all but the latest version of DKMS from Dell may be buggy.
　　If DKMS is not used and the development environment and kernel source are not already installed:
　　yum groupinstall "Development Tools"
yum install kernel-devel
　　Youmay also choose to only install a minimum set of individual developmenttool packages (at least gcc and make are required) rather than the groupinstall which some may consider overkill. Replace "kernel-devel" with "kernel-PAE-devel" if using a PAE kernel. If you are not using a standard CentOS kernel, you must acquire and install the source for yourkernel from wherever you got the kernel. Do not try to use VirtualBox with a Xen kernel, nor to install a Xen kernel in a Guest OS.
　　Note: For CentOS as a Guest OS the same packages are used to build the "Guest Additions" drivers.
　　Install the RPM:
　　yum install VirtualBox-4.1
　　or for the old versions
　　yum install VirtualBox-4.0
　　or
　　yum install VirtualBox-4.2
　　Theinstaller will create the "vboxusers" group and create the necessary kernel modules if the development environment has been correctly configured.
　　For each "username" that will run VirtualBox:
　　usermod -a -G vboxusers username
　　or use the GUI Users and Groups tool.