diff --git a/13-13-mongo.yaml b/13-13-mongo.yaml
new file mode 100644
index 0000000..368b1a6
--- /dev/null
+++ b/13-13-mongo.yaml
@@ -0,0 +1,35 @@
+apiVersion: apps/v1beta1
+kind: StatefulSet
+metadata:
+  name: mongo
+spec:
+  serviceName: "mongo"
+  replicas: 3
+  template:
+    metadata:
+      labels:
+        app: mongo
+    spec:
+      containers:
+      - name: mongodb
+        image: mongo:3.4.1
+        command:
+        - mongod
+        - --replSet
+        - rs0
+        ports:
+        - containerPort: 27017
+          name: web
+      # This container initializes the mongodb, then sleeps.
+      - name: init-mongo
+        image: mongo:3.4.1
+        command:
+        - bash
+        - /config/init.sh
+        volumeMounts:
+        - name: config
+          mountPath: /config
+      volumes:
+      - name: config
+        configMap:
+          name: "mongo-init"