VirtualBox + CentOS installation enhancements 1. Start the CentOS 5.5 virtual machine installed in VirtualBox, and click "device" => "Install enhancement ". At this time, you can see that a "cd" has been mounted to the CentOS 5.5 desktop. It contains components for installing VirtualBox client enhancement. 2. You need to install and compile the relevant components of the kernel. Yum install gcc kernel-devel kernel-headers 3. install the VirtualBox client Enhancement Tool. Choose the VirtualBox client enhancement tool that is consistent with your system to install, where the VBoxLinuxAdditions-x86.run works for 32 systems and the VBoxLinuxAdditions-amd64.run is for 64-bit systems. Run the following command to install sh./VBoxLinuxAdditions. run (premise: Enter the directory of the mounted disc under/media) 4. restart the system after the installation is successful.