port join action

pkg/cluster/nodes/util.go

@@ -0,0 +1,44 @@
+/*
+Copyright 2019 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package nodes
+
+import (
+	"fmt"
+
+	"github.com/pkg/errors"
+	"sigs.k8s.io/kind/pkg/cluster/internal/haproxy"
+)
+
+// GetControlPlaneEndpoint returns the control plane endpoint in case the
+// cluster has an external load balancer in front of the control-plane nodes,
+// otherwise return an empty string.
+func GetControlPlaneEndpoint(allNodes []Node) (string, error) {
+	node, err := ExternalLoadBalancerNode(allNodes)
+	if err != nil {
+		return "", err
+	}
+	// if there is no external load balancer
+	if node == nil {
+		return "", nil
+	}
+	// gets the IP of the load balancer
+	loadBalancerIP, err := node.IP()
+	if err != nil {
+		return "", errors.Wrapf(err, "failed to get IP for node: %s", node.Name())
+	}
+	return fmt.Sprintf("%s:%d", loadBalancerIP, haproxy.ControlPlanePort), nil
+}