I installed CentOS 7 inside VirtualBox. Additionally, I installed virtualbox guest additions in the following way:

yum update kernel*
yum update
yum install kernel-devel kernel-headers dkms gcc gcc-c++
yum install epel-release
yum install dkms
cd /etc/yum.repos.d/
wget http://download.virtualbox.org/virtualbox/rpm/rhel/virtualbox.repo
yum install libgomp glibc-headers glibc-devel binutils patch make
yum install VirtualBox-5.0.x86_64
/usr/lib/virtualbox/vboxdrv.sh setup

Unfortunately, I am not able to get CentOS in fullscreen mode and I have two mouse pointers.enter image description here

How is it possible to get fullscreen and only one mouse pointer?


VirtualBox Guest Extensions

Follow that link, find your version of VirtualBox and I normally use the ISO and manually mount the CDROM drive under Linux and perform the install. Never had luck installing from the EPEL

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