Chapter 1. Overview

Installer-provisioned installation on bare metal nodes deploys and configures the infrastructure that an OpenShift Container Platform cluster runs on. This guide provides a methodology to achieving a successful installer-provisioned bare-metal installation. The following diagram illustrates the installation environment in phase 1 of deployment:

For the installation, the key elements in the previous diagram are:

In phase 2 of the deployment, the provisioner destroys the bootstrap VM automatically and moves the virtual IP addresses (VIPs) to the appropriate nodes.

The keepalived.conf file sets the control plane machines with a lower Virtual Router Redundancy Protocol (VRRP) priority than the bootstrap VM, which ensures that the API on the control plane machines is fully functional before the API VIP moves from the bootstrap VM to the control plane. Once the API VIP moves to one of the control plane nodes, traffic sent from external clients to the API VIP routes to an haproxy load balancer running on that control plane node. This instance of haproxy load balances the API VIP traffic across the control plane nodes.

The Ingress VIP moves to the worker nodes. The keepalived instance also manages the Ingress VIP.

The following diagram illustrates phase 2 of deployment:

After this point, the node used by the provisioner can be removed or repurposed. From here, all additional provisioning tasks are carried out by the control plane.