myapp.yaml

-apiVersion: v1
-kind: ReplicationController
+apiVersion: extensions/v1beta1
+kind: Deployment
 metadata:
 metadata:
   name: myapp
   name: myapp
 spec:
 spec:
   replicas: 1
   replicas: 1
   selector:
   selector:
-    app: myapp
+    matchLabels:
+      tier: frontend
   template:
   template:
     metadata:
     metadata:
       labels:
       labels:
         app: myapp
         app: myapp
+        tier: frontend
     spec:
     spec:
       containers:
       containers:
       - name: myapp
       - name: myapp