As per documentation install Rancher server on either a single node or HA mode.
After running Rancher server, access Rancher server UI at https://<ip> and create new Cluster, please refer to the documentation for more information about how to create a cluster.
On the new kubernetes cluster run the Conformance tests using the following command:
curl -L https://raw.githubusercontent.com/cncf/k8s-conformance/master/sonobuoy-conformance.yaml | kubectl apply -f -Watch Sonobuoy's logs with:
kubectl logs -f -n sonobuoy sonobuoy
Wait for the line no-exit was specified, sonobuoy is now blocking, and then copy the results using kubectl cp