Dell Technologies has simplified the process of bootstrapping the OpenShift Container Platform 4.6 cluster. To use the simplified process, ensure that:
The deployment procedure begins with initial switch provisioning. This step enables preparation and installation of the CSAH node, involving:
Dell Technologies has generated Ansible playbooks that fully prepare the CSAH node. Before the installation of the OpenShift Container Platform 4.6 cluster begins, the Ansible playbook sets up a PXE server, DHCP server, DNS server, HAProxy, and HTTP server. The playbook also creates ignition files to drive installation of the bootstrap, control plane, and compute nodes. It also starts the bootstrap VM to initialize control plane components. The playbook presents a list of node types that must be deployed in top-down order.
Note: For enterprise sites, consider deploying appropriately hardened DHCP and DNS servers. Similarly, consider using resilient multiple-node HAProxy configuration. The Ansible playbook for this design deploys a single HAProxy instance. This guide provides CSAH Ansible playbooks for reference only at the implementation stage.
The Ansible playbook creates an install-config.yaml file that is used to control deployment of the bootstrap node. For more information, see the at the . An ignition configuration control file starts the bootstrap node, as shown in the following figure:
Note: An installation that is driven by ignition configuration generates security certificates that expire after 24 hours. You must install the cluster before the certificates expire, and the cluster must operate in a viable (nondegraded) state so that the first certificate rotation can be completed.
The cluster bootstrapping process consists of the following phases:
The control-plane nodes now drive creation and instantiation of the compute nodes.
The cluster is now viable and can be placed into service in readiness for Day-2 operations. You can expand the cluster by adding compute nodes.