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You cannot change the apiserver port. You need to pass through the default ports (9345 and 6443), and ensure that you’re not offloading TLS.

Because two clusters need to be deployed, one k3s cluster for deploying rancher and one rke2 cluster as a downstream cluster, with only one set of load balancing services, port conflicts may occur if the listening ports are not modified

Are you trying to put both rke2 and k3s behind the same lb?

Okay, then I will deploy a new lb for rke2. Thank you very much