From the install DVD:
choose no packages and customize all to deselect all packages
BEWARE: this is a very empty configuration so you will have to install A LOT from yum...
yum install wget elinks sudo which
IF you need to do anything with "compiling"
yum install make gcc
yum install kernel ? maybe necessary?
yum install kernel-devel-$(uname -r)
yum install kernel-headers-$(uname -r)
export KERN_DIR=/usr/src/kernels/$(uname -r)-x86_64
to add a repository, e.g. VirtualBox
So create the following file (in the directory) /etc/yum.repos.d/virtualbox.repo
[virtualbox]
name=RHEL/CentOS-$releasever / $basearch - VirtualBox
baseurl=http://download.virtualbox.org/virtualbox/rpm/rhel/$releasever/$basearch
enabled=1
gpgcheck=1
gpgkey=http://download.virtualbox.org/virtualbox/debian/sun_vbox.asc
then try
yum install virtualbox
download locations
http://download.virtualbox.org/virtualbox/rpm/rhel/
http://download.virtualbox.org/virtualbox/debian/sun_vbox.asc