OKD 4 includes new technologies and functionality that results in a cluster that is self-managing, flexible, and automated. The way that OKD 4 clusters are deployed and managed drastically differs from OKD 3.
To successfully transition from OKD 3 to OKD 4, it is important that you review the following information:
Learn about the differences between OKD versions 3 and 4. Prior to transitioning, be sure that you have reviewed and prepared for storage, networking, logging, security, and monitoring considerations.
Learn about and use the tools to perform your migration:
Migration Toolkit for Containers (MTC) to migrate your application workloads
Control Plane Migration Assistant (CPMA) to migrate your control plane