Dell Technologies has simplified the process of bootstrapping the OpenShift Container Platform 4.6 cluster. To use the simplified process, ensure that:
The deployment begins with initial switch provisioning. Initial switch provisioning enables preparation and installation of the CSAH node and consists of:
Dell Technologies has generated Ansible playbooks that fully prepare both CSAH nodes. 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. If a second CSAH node is deployed, the playbook also sets up DNS, HAProxy, HTTP, and KeepAlived services on that node. The playbook creates ignition files to drive installation of the bootstrap, control-plane, and compute nodes, and 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 and using resilient multiple-node HAProxy configuration. The Ansible playbook for this design can deploy multiple CSAH nodes for resilient HAProxy configuration. This guide provides CSAH Ansible playbooks for reference only at the implementation stage.
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 cluster is now viable and can be placed into service in readiness for Day-2 operations. You can expand the cluster by adding more compute nodes to suit your requirements.