OpenShift and OKD 4 are using CoreOS for cluster nodes. The only way to configure them is to use Ignition and OSTree. Both of them are automated with MachineConfig Operator, which we will see in this video - how it works and how to use it to customize the cluster:

Production OpenShift Cluster in 35 Minutes:

• Part I, First look at OKD 4
• Part II, 3 Core Features of OpenShift 4 Cluster Management
• Part III, How to Configure OpenShift 4 Cluster Nodes
• Part IV, OpenShift 4 Troubleshooting

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