region=infra            Infrastructure nodes which are used by OpenShift to run router and registry services. This is 
                        more or less ipekatrin* nodes down in the basement.
region=prod             Production servers (ipecompute*, etc.) located anythere, but I expect only basement.
region=dev              Temporary nodes

zone=default            Basement
zone=404                Second server room on 4th floor
zone=student            Student room
zone=external           Other external places



production: 1           Specifies all production servers (no extra load, no occasional reboots)
                        This includes 'infra' and 'prod' regions.
server: 1               Like production, but with occasional reboots and some extra testing load possible
permanent: 1            Non-production systems, but which are permanently connected to OpenShift