Add a label which prevents a node from being added to a cloud load balancer.

cmd/kubeadm/app/constants/constants.go

@@ -134,6 +134,10 @@ const (
 	// It's copied over to kubeadm until it's merged in core: https://github.com/kubernetes/kubernetes/pull/39112
 	LabelNodeRoleMaster = "node-role.kubernetes.io/master"
 
+	// LabelNodeRoleExcludeBalancer specifies that the node should be
+	// exclude from load balancers created by a cloud provider.
+	LabelNodeRoleExcludeBalancer = "node.role.kubernetes.io/exclude-balancer"
+
 	// MasterConfigurationConfigMap specifies in what ConfigMap in the kube-system namespace the `kubeadm init` configuration should be stored
 	MasterConfigurationConfigMap = "kubeadm-config"
 

pkg/controller/service/service_controller.go

@@ -598,6 +598,10 @@ func getNodeConditionPredicate() corelisters.NodeConditionPredicate {
 			return false
 		}
 
+		if _, hasExcludeBalancerLabel := node.Labels[constants.LabelNodeRoleExcludeBalancer]; hasExcludeBalancerLabel {
+			return false
+		}
+
 		// If we have no info, don't accept
 		if len(node.Status.Conditions) == 0 {
 			return false