Is it possible to change the CNI for a rke/rke2/k3s cluster or Rancher launched cluster post-provisioning?

Article Number: 000020904

Environment

RKE1/RKE2/K3s Clusters
Any cluster provisioned by Rancher

Situation

The CNI for a cluster can be specified in the cluster configuration  when launching a Kubernetes cluster via both the CLI and Rancher v2.x. Is it possible to change the CNI after the cluster has been provisioned?

Resolution

Changing the cluster CNI after the cluster has been provisioned is not supported and care should be taken to set these as required when first configuring the cluster.