Installing vagrant on Centos 6
# Install virtualbox
cd /etc/yum.repos.d/
wget http://download.virtualbox.org/virtualbox/rpm/rhel/virtualbox.repo
sudo yum update
sudo rpm -Uvh http://dl.fedoraproject.org/pub/epel/6/i386/epel-release-6-8.noarch.rpm
sudo yum -y install binutils gcc make patch libgomp glibc-headers glibc-devel kernel-headers kernel-devel dkms
sudo yum -y install VirtualBox-4.2
# If necessary install ruby-devel
sudo yum -y install make gcc ruby-devel
sudo yum -y install ruby
sudo yum -y install rubygems
sudo gem update --system
sudo gem install vagrant