When a host is built as RedHat 6.7 and 'yum update' is run to update to RedHat 6.8, the host's operating system is updated to an Operating System that does not yet have templates assigned or media present. This causes subsequent builds of the host to fail unless the operating system is set back to RedHat 6.7. This is particularly useful with RedHat in cases where the installation media has to be manually made available.