Merge pull request kubernetes-sigs#22 from rombert/master

Add a flag to disable leader election

README.md

@@ -113,7 +113,9 @@ spec:
             path: /var/nfs
 ```
 
-You may also want to change the PROVISIONER_NAME above from `fuseim.pri/ifs` to something more descriptive like `nfs-storage`, but if you do remember to also change the PROVISIONER_NAME in the storage class definition below:
+You may also want to change the PROVISIONER_NAME above from `fuseim.pri/ifs` to something more descriptive like `nfs-storage`, but if you do remember to also change the PROVISIONER_NAME in the storage class definition below.
+
+To disable leader election, define an env variable named ENABLE_LEADER_ELECTION and set its value to false.
 
 **Step 5: Deploying your storage class**
 

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

@@ -247,13 +247,27 @@ func main() {
 		glog.Fatalf("Error getting server version: %v", err)
 	}
 
+	leaderElection := true
+	leaderElectionEnv := os.Getenv("ENABLE_LEADER_ELECTION")
+	if ( leaderElectionEnv != "" ) {
+		leaderElection, err = strconv.ParseBool(leaderElectionEnv)
+		if err != nil {
+			glog.Fatalf("Unable to parse ENABLE_LEADER_ELECTION env var: %v", err)
+		}
+	}
+
 	clientNFSProvisioner := &nfsProvisioner{
 		client: clientset,
 		server: server,
 		path:   path,
 	}
 	// Start the provision controller which will dynamically provision efs NFS
 	// PVs
-	pc := controller.NewProvisionController(clientset, provisionerName, clientNFSProvisioner, serverVersion.GitVersion)
+	pc := controller.NewProvisionController(clientset,
+		provisionerName,
+		clientNFSProvisioner,
+		serverVersion.GitVersion,
+		controller.LeaderElection(leaderElection),
+	)
 	pc.Run(wait.NeverStop)
 }