Deployed a 14 node, bare-metal development cluster with RKE, and mounted my NFS drives with nfs-client-provisioner. Have not had a single hick-up. I love Rancher 2.
PS: Rancher gets bonus points for the built-in Ingress that RKE can optionally install. The configuration is very similar to GKE’s ingress, which simplifies my helm charts.
Please create a new topic instead of dragging up a year old one that has nothing to do with your question. Using LetsEncrypt with cert-manager is something you can deploy on any k8s and not something that is specifically a Rancher feature or capability.
(Other than as part of the installation options for Rancher itself, where it is documented),