kubernetes horizontal pod autoscaler example

k8s/deployment.yml

@@ -0,0 +1,22 @@
+apiVersion: extensions/v1beta1
+kind: Deployment
+metadata:
+  name: node-example
+spec:
+  replicas: 1
+  template:
+    metadata:
+      labels:
+        app: node-example
+    spec:
+      containers:
+      - name: node-example
+        image: vamin2/node-example
+        imagePullPolicy: Always
+        ports:
+        - containerPort: 3000
+        resources:
+            limits:
+              cpu: "0.5"
+            requests:
+              cpu: "0.25"

k8s/hpa.yml

@@ -0,0 +1,14 @@
+apiVersion: autoscaling/v1
+kind: HorizontalPodAutoscaler
+metadata:
+  annotations:
+  name: node-example
+  namespace: default
+spec:
+  maxReplicas: 4
+  minReplicas: 1
+  scaleTargetRef:
+    apiVersion: extensions/v1
+    kind: Deployment
+    name: node-example
+  targetCPUUtilizationPercentage: 1

k8s/service.yml

@@ -0,0 +1,14 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: node-example
+  labels:
+    app: node-example
+spec:
+  selector:
+    app: node-example
+  ports:
+  - port: 3000
+    protocol: TCP
+    nodePort: 30001
+  type: LoadBalancer

package.json

@@ -5,7 +5,7 @@
   "main": "index.js",
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1",
-    "start" : "node index.js"
+    "start" : "node src/index.js"
   },
   "author": "Vivek Amin",
   "license": "ISC"

src/index.js

@@ -3,7 +3,7 @@ const port = process.env.PORT || 3000;
 const server = http.createServer((req, res) => {
 res.statusCode = 200;
 res.setHeader('Content-Type', 'text/plain');
-res.end('Hello World\n');
+res.end('Hello World!!\n');
 });
 server.listen(port, () => {
  console.log(`Server running on port: ${port}`);