Please, view this question at ask.openstack.org :-

https://ask.openstack.org/en/question/29460/attempt-to-upgrade-aio-havana-to-icehouse-on-centos-65-vm-on-libvirts-subnet/

> For details on the H -> I update process see:
> http://openstack.redhat.com/Upgrading_RDO_To_Icehouse
>
> thanks,
> Pádraig.