Enabled leader election based leases

Signed-off-by: Humble Chirammal <humble.devassy@gmail.com>

cmd/nfs-subdir-external-provisioner/provisioner.go

@@ -36,7 +36,7 @@ import (
 	"k8s.io/client-go/rest"
 	"k8s.io/client-go/tools/clientcmd"
 	storagehelpers "k8s.io/component-helpers/storage/volume"
-	"sigs.k8s.io/sig-storage-lib-external-provisioner/v6/controller"
+	"sigs.k8s.io/sig-storage-lib-external-provisioner/v8/controller"
 )
 
 const (
@@ -245,13 +245,6 @@ func main() {
 		glog.Fatalf("Failed to create client: %v", err)
 	}
 
-	// The controller needs to know what the server version is because out-of-tree
-	// provisioners aren't officially supported until 1.5
-	serverVersion, err := clientset.Discovery().ServerVersion()
-	if err != nil {
-		glog.Fatalf("Error getting server version: %v", err)
-	}
-
 	leaderElection := true
 	leaderElectionEnv := os.Getenv("ENABLE_LEADER_ELECTION")
 	if leaderElectionEnv != "" {
@@ -271,7 +264,6 @@ func main() {
 	pc := controller.NewProvisionController(clientset,
 		provisionerName,
 		clientNFSProvisioner,
-		serverVersion.GitVersion,
 		controller.LeaderElection(leaderElection),
 	)
 	// Never stops.

deploy/rbac.yaml

@@ -50,6 +50,9 @@ rules:
   - apiGroups: [""]
     resources: ["endpoints"]
     verbs: ["get", "list", "watch", "create", "update", "patch"]
+  - apiGroups: ["coordination.k8s.io"]
+    resources: ["leases"]
+    verbs: ["get", "create", "update"]
 ---
 kind: RoleBinding
 apiVersion: rbac.authorization.k8s.io/v1