diff --git a/README.md b/README.md
index 39d4148..ae82ebc 100644
--- a/README.md
+++ b/README.md
@@ -12,3 +12,7 @@ Note: we are not using pi-hole as a DHCP server. We leave this to the router, al
 
 ### Discoveries
 1. Do not have a secondary DNS server in router config. This makes pi-hole local DNS not work.
+2. Do not use `.local` for domain in local DNS. You will see a warning when using dig that `.local` is reserved for mDNS.
+
+## Container registry
+For saving docker images.
diff --git a/Untitled-2023-11-16-1253.excalidraw b/Untitled-2023-11-16-1253.excalidraw
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diff --git a/metallb.yaml b/metallb.yaml
new file mode 100644
index 0000000..7ed5c46
--- /dev/null
+++ b/metallb.yaml
@@ -0,0 +1,16 @@
+apiVersion: metallb.io/v1beta1
+kind: IPAddressPool
+metadata:
+  name: first-pool
+  # namespace: metallb-system
+spec:
+  addresses:
+  - 192.168.50.101-192.168.50.110
+
+---
+
+apiVersion: metallb.io/v1beta1
+kind: L2Advertisement
+metadata:
+  name: example
+  # namespace: metallb-system
diff --git a/sample-app-deployment.yaml b/sample-app-deployment.yaml
new file mode 100644
index 0000000..808b388
--- /dev/null
+++ b/sample-app-deployment.yaml
@@ -0,0 +1,20 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: sample-app-deployment
+spec:
+  replicas: 3
+  selector:
+    matchLabels:
+      app: nginx
+  template:
+    metadata:
+      labels:
+        app: nginx
+    spec:
+      containers:
+        - name: nginx
+          image: public.ecr.aws/nginx/nginx:1.23
+          ports:
+            - name: tcp
+              containerPort: 80
diff --git a/sample-app-service.yaml b/sample-app-service.yaml
new file mode 100644
index 0000000..be22b28
--- /dev/null
+++ b/sample-app-service.yaml
@@ -0,0 +1,15 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: sample-app-service
+  annotations:
+    metallb.universe.tf/address-pool: first-pool
+spec:
+  ports:
+    - port: 80
+      targetPort: 80
+      protocol: TCP
+  type: LoadBalancer
+  selector:
+    app: nginx
+