I have yet to touch OpenShift 4 - every environment that used OpenShift that I worked with professionally except for some testing runs was air-gapped to some extent from internet, something that is not supported on OpenShift 4, and which was treated as a crucial requirement by the customer deploying OpenShift.
Oh, that's a good news. Just this friday when I first looked into OpenShift install, it looked like it wasn't even in the plans, so I might have hit older docs than I intended.
Makes for higher possibility that $DAYJOB upgrades to OpenShift 4.x, but then, we would rather get rid of our (intra-group) provider and their openshift environments...