Install VirtualBox 5.0.x in CentOS 7

readme.txt

Goal
----
Install VirtualBox 5.0.x in a CentOS 7 workstation.

Pre-requisites
--------------
1) Using a user in sudo privileges
2) Start a root shell (e.g.: sudo -i)
3) EPEL repository needed:
  $ rpm -Uvh http://dl.fedoraproject.org/pub/epel/7/x86_64/e/epel-release-7-5.noarch.rpm

Installation
------------
Just run the provided install_virtualbox5_centos7.sh script

Post-installation steps
-----------------------
Check the installation log file: /var/log/vbox-install.log

Run VirtualBox
--------------
If you have a GUI, tnen just run "VirtualBox", but if your host is a headless Linux server, then you need to use "VBoxHeadless"
More info about headless servers: https://www.virtualbox.org/manual/ch07.html#vboxheadless

Tip 1: do not forget to add your user to the 'vboxusers' group.
  $ usermod -a -G vboxusers your_user_here

Tip 2: install the extension pack in order to enable a remote display
  $ wget http://download.virtualbox.org/virtualbox/5.0.6/Oracle_VM_VirtualBox_Extension_Pack-5.0.6-103037.vbox-extpack
  $ VBoxManage extpack install Oracle_VM_VirtualBox_Extension_Pack-5.0.6-103037.vbox-extpack

References:
----------
https://www.virtualbox.org/manual/UserManual.html
  specially: 
    https://www.virtualbox.org/manual/ch02.html#install-linux-host
    https://www.virtualbox.org/manual/ch02.html#install-linux-host
http://www.tecmint.com/install-virtualbox-on-redhat-centos-fedora/
http://www.if-not-true-then-false.com/2010/install-virtualbox-with-yum-on-fedora-centos-red-hat-rhel/
http://www.itzgeek.com/how-tos/linux/centos-how-tos/install-virtualbox-4-3-on-centos-7-rhel-7.html
https://fedoraproject.org/wiki/Common_F20_bugs#RPM_scriptlets_fail_during_updates

install_virtualbox5_centos7.sh

#!/bin/sh

echo ">>>> System update and get minimal required modules to use vboxdrv kernel <<<<"
yum update -y
yum install -y binutils qt gcc make patch libgomp glibc-headers glibc-devel

echo ">>>> Getting kernel headers and DKMS to favour future VirtualBox kernel Updates <<<<"
yum install -y kernel-headers kernel-devel dkms

repoFile="/etc/yum.repos.d/virtualbox.repo"
if [ -e $repoFile ]
then
    echo ">>>> Repo file is already in yum repos. Skipping this step. <<<<"
else
    echo ">>>> Repo file is not in yum repos. Downloading it. <<<<"
    wget http://download.virtualbox.org/virtualbox/rpm/el/virtualbox.repo -O $repoFile
fi

# Next is to avoid "Error in PREUN scriptlet in rpm package VirtualBox-5.0-5.0.6_103037_el7-1.x86_64"
KERN_DIR=/usr/src/kernels/`uname -r`-`uname -m`
export KERN_DIR

echo ">>>> Getting VirtualBox 5.0.x from repo <<<<"
yum install -y VirtualBox-5.0