add experimental warning for multinode clusters

cmd/minikube/cmd/completion.go

@@ -288,7 +288,7 @@ __minikube_bash_source <(__minikube_convert_bash_to_zsh)
 	return nil
 }
 
-// GenerateBashCompletion generates the completion for the bash shell
+// GenerateFishCompletion generates the completion for the bash shell
 func GenerateFishCompletion(w io.Writer, cmd *cobra.Command) error {
 	_, err := w.Write([]byte(boilerPlate))
 	if err != nil {

cmd/minikube/cmd/node_add.go

@@ -57,6 +57,7 @@ var nodeAddCmd = &cobra.Command{
 
 		// Make sure to decrease the default amount of memory we use per VM if this is the first worker node
 		if len(cc.Nodes) == 1 && viper.GetString(memory) == "" {
+			warnAboutMultiNode()
 			cc.Memory = 2200
 		}
 

cmd/minikube/cmd/start.go

@@ -285,6 +285,7 @@ func startWithDriver(starter node.Starter, existing *config.ClusterConfig) (*kub
 		if driver.BareMetal(starter.Cfg.Driver) {
 			exit.WithCodeT(exit.Config, "The none driver is not compatible with multi-node clusters.")
 		} else {
+			warnAboutMultiNode()
 			for i := 1; i < numNodes; i++ {
 				nodeName := node.Name(i + 1)
 				n := config.Node{
@@ -305,6 +306,10 @@ func startWithDriver(starter node.Starter, existing *config.ClusterConfig) (*kub
 	return kubeconfig, nil
 }
 
+func warnAboutMultiNode() {
+	out.T(out.Tip, "Multi-node clusters are currently experimental and might exhibit unintended behavior.\nTo track progress on multi-node clusters, see https://github.com/kubernetes/minikube/issues/7538.")
+}
+
 func updateDriver(driverName string) {
 	v, err := version.GetSemverVersion()
 	if err != nil {