Version 3.1-stable builds
sudo wget http://www.dreyou.org/ovirt/ovirt-dre.repo -P /etc/yum.repos.d/
Chek if ovirt31-dre, vdsm31-dre repositories enabled by default in /etc/yum.repos.d/ovirt-dre.repo (enable=1).
yum clean all yum makecache
Check that the engine FQDN is resolvable from the node (For example, edit /etc/hosts).
Check that the CentOS version is 6.3, make update if needed.
Add epel repositories for python-ply, python-kitchen needed by ovirt-engine-cli (http://fedoraproject.org/wiki/EPEL/FAQ).
Install python-ply and python-kitchen
yum install python-ply python-kitchen
Install ovirt-engine and ovirt-engine-cli, but disable epel repositories, which contains other ovirt-engine-cli and ovirt-engine-sdk packages
yum --disablerepo=epel install ovirt-engine ovirt-engine-cli
Now you can enter to engine console and add you node to cluster.
If you have some problems while installing engine or running Vms look here.