Lower case node names before registering

pkg/cloudprovider/controller/nodecontroller.go

@@ -20,6 +20,7 @@ import (
 	"errors"
 	"net"
 	"reflect"
+	"strings"
 	"sync"
 	"time"
 
@@ -112,6 +113,7 @@ func (s *NodeController) Run(period time.Duration, retryCount int) {
 // RegisterNodes registers the given list of nodes, it keeps retrying for `retryCount` times.
 func (s *NodeController) RegisterNodes(nodes *api.NodeList, retryCount int, retryInterval time.Duration) error {
 	registered := util.NewStringSet()
+	nodes = s.canonicalizeName(nodes)
 	for i := 0; i < retryCount; i++ {
 		for _, node := range nodes.Items {
 			if registered.Has(node.Name) {
@@ -330,3 +332,11 @@ func (s *NodeController) CloudNodes() (*api.NodeList, error) {
 func (s *NodeController) isRunningCloudProvider() bool {
 	return s.cloud != nil && len(s.matchRE) > 0
 }
+
+// canonicalizeName takes a node list and lowercases all nodes' name.
+func (s *NodeController) canonicalizeName(nodes *api.NodeList) *api.NodeList {
+	for i := range nodes.Items {
+		nodes.Items[i].Name = strings.ToLower(nodes.Items[i].Name)
+	}
+	return nodes
+}

pkg/cloudprovider/controller/nodecontroller_test.go

@@ -135,6 +135,22 @@ func TestRegisterNodes(t *testing.T) {
 			expectedFail:         false,
 		},
 		{
+			// Canonicalize node names.
+			machines: []string{"NODE0", "node1"},
+			fakeNodeHandler: &FakeNodeHandler{
+				CreateHook: func(fake *FakeNodeHandler, node *api.Node) bool {
+					if node.Name == "NODE0" {
+						return false
+					}
+					return true
+				},
+			},
+			retryCount:           1,
+			expectedRequestCount: 2,
+			expectedCreateCount:  2,
+			expectedFail:         false,
+		},
+		{
 			// No machine to register.
 			machines: []string{},
 			fakeNodeHandler: &FakeNodeHandler{