add demo of metallb working

kubernetes/ip-address-pool.yaml

@@ -0,0 +1,8 @@
+apiVersion: metallb.io/v1beta1
+kind: IPAddressPool
+metadata:
+  name: main
+  namespace: metallb-system
+spec:
+  addresses:
+  - 192.168.40.100-192.168.40.253

kubernetes/l2-advertisement.yaml

@@ -0,0 +1,5 @@
+apiVersion: metallb.io/v1beta1
+kind: L2Advertisement
+metadata:
+  name: main
+  namespace: metallb-system

kubernetes/loadbalancer-test.yaml

@@ -0,0 +1,35 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: loadbalancer-test
+  # annotations:
+  #   metallb.universe.tf/loadBalancerIPs: 192.168.1.100
+spec:
+  ports:
+  - port: 80
+    targetPort: 8000
+  selector:
+    app: loadbalancer-test
+  type: LoadBalancer
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: loadbalancer-test
+  labels:
+    app: loadbalancer-test
+spec:
+  replicas: 3
+  selector:
+    matchLabels:
+      app: loadbalancer-test
+  template:
+    metadata:
+      labels:
+        app: loadbalancer-test
+    spec:
+      containers:
+      - name: loadbalancer-test
+        image: mpepping/cyberchef
+        ports:
+        - containerPort: 8000