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I am not entirely sure i understand the question

Try to provide some general concept. Generally, the Rancher cluster and Harvester Cluster are independently installed first, then Harvester cluster is imported into Rancher, finally, the Rancher can use Harvester to create guest RKE cluster. To install Harvester, you need to prepare some clean environmentS first, baremetal server / virtual machine, use ISO or PXE to install, Harvester will install OS on the NODE and setup the cluster itself.

Thank you