Using the pre-existing install process, also known as user provisioned infrastructure or UPI, gives the administrator the ability to create and manage OpenShift nodes themselves. The OpenShift install process changes when using this method, where the Ignition configs must be provided to the nodes so that they may cofigure and join the cluster. For more information, refer to the installer documentation
In this video, an installation is done on Bare Metal using Packet.net.
In this video, a Bare Metal install is done from start to finish. This video also goes through all the prerequisites and how to satisfy them before installation.
In this blog we will go over how to get you up and running with a Red Hat OpenShift 4 Bare Metal install on pre-existing infrastructure. Although this quickstart focuses on the bare metal installer, this can also be seen as a "manual" way to install OpenShift 4. Moreover, this is also applicable to installing to any platform which doesn’t have the ability to provide ignition pre-boot.