Welcome to Stack Simplify

Author: Kalyan Reddy Daida

16-EKS-VPA-Vertical-Pod-Autoscaler/README.md

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+# EKS - Vertical Pod Autoscaling (VPA)
+
+## Step-01: Introduction
+- The Kubernetes Vertical Pod Autoscaler automatically adjusts the CPU and memory reservations for your pods to help "right size" your applications. 
+- This adjustment can improve cluster resource utilization and free up CPU and memory for other pods. 
+
+## Step-02: Pre-requisite - Metric server
+- Metric server should be installed & ready, we have done that as part of HPA
+
+## Step-03: Deploy the Vertical Pod Autoscaler (VPA)
+```
+# Clone Repo
+git clone https://github.com/kubernetes/autoscaler.git
+
+# Navigate to VPA
+cd autoscaler/vertical-pod-autoscaler/
+
+# Uninstall VPA (if we are using old one)
+./hack/vpa-down.sh
+
+# Install new version of VPA
+./hack/vpa-up.sh
+
+# Verify VPA Pods
+kubectl get pods -n kube-system
+```
+
+## Step-04: Review & Deploy our Application Manifests (Deployment & Service)
+- Make a note of resources we have defined `spec.containers.resources.requests`.
+- `limits` we define in VPA definition
+```yml
+        resources:
+          requests:
+            cpu: "5m"       
+            memory: "5Mi"   
+```
+
+- **Deploy**
+```
+# Deploy Application
+kubectl apply -f 01-kubenginx-Deployment-NodePort-Service.yml
+
+# List Pods, Deploy & Service
+kubectl get pod,svc,deploy
+
+# Describe Pod
+kubectl describe pod <pod-name>
+
+# Access Application (If our NodeGroup is in Public Subnet, if not ignore)
+kubectl get nodes -o wide
+http://<Worker-Node-Public-IP>:31232
+```
+
+## Step-05: Create & Deploy VPA manifest
+
+### Create VPA Manifest
+- Create a VPA manifest for our above Application which we deployed just now. 
+```yml
+apiVersion: "autoscaling.k8s.io/v1beta2"
+kind: VerticalPodAutoscaler
+metadata:
+  name: kubengix-vpa
+spec:
+  targetRef:
+    apiVersion: "apps/v1"
+    kind: Deployment
+    name: vpa-demo-deployment
+  resourcePolicy:
+    containerPolicies:
+      - containerName: '*'
+        minAllowed:
+          cpu: 5m
+          memory: 5Mi
+        maxAllowed:
+          cpu: 1
+          memory: 500Mi
+        controlledResources: ["cpu", "memory"]
+```
+
+### Deploy VPA Manifest
+```
+# Deploy
+kubectl apply -f kube-manifests/02-VPA-Manifest.yml
+
+# List VPA
+kubectl get vpa
+
+# Describe VPA
+kubectl describe vpa kubengix-vpa
+```
+
+
+## Step-06: Generate Load
+- Open 3 more new terminals and execute below 3 load generation commands
+```
+# Terminal 1 - List and watch pods
+kubectl get pods -w
+
+# Terminal 2 - Generate Load
+kubectl run --generator=run-pod/v1 apache-bench -i --tty --rm --image=httpd -- ab -n 500000 -c 1000 http://vpa-demo-service-nginx.default.svc.cluster.local/hello
+
+# Terminal 3 - Generate Load
+kubectl run --generator=run-pod/v1 apache-bench2 -i --tty --rm --image=httpd -- ab -n 500000 -c 1000 http://vpa-demo-service-nginx.default.svc.cluster.local/hello
+
+# Terminal 4 - Generate Load
+kubectl run --generator=run-pod/v1 apache-bench3 -i --tty --rm --image=httpd -- ab -n 500000 -c 1000 http://vpa-demo-service-nginx.default.svc.cluster.local/hello
+```
+
+## Step-07: Describe pods which were re-launched by VPA Updater
+```
+# List Pods
+kubectl get pods
+
+# Describe pods
+kubectl describe pod <recently-relaunched-pod>
+```
+
+## Step-08: Important Nodes about VPA:
+1. VPA Updater can re-launch new pod with updated CPU and Memory when you atleast have 2 pods in a deployment. 
+2. If we have only one pod, unless we manually delete that pod, it will not launch new pod with VPA recommended CPU and memory considerign the application availability scenario.
+
+## Step-09: Clean-Up
+```
+kubectl delete -f kube-manifests/
+```

16-EKS-VPA-Vertical-Pod-Autoscaler/kube-manifests/01-VPA-DemoApplication.yml

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+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: vpa-demo-deployment
+  labels:
+    app: vpa-nginx
+spec:
+  replicas: 4
+  selector:
+    matchLabels:
+      app: vpa-nginx
+  template:
+    metadata:
+      labels:
+        app: vpa-nginx
+    spec:
+      containers:
+      - name: vpa-nginx
+        image: stacksimplify/kubenginx:1.0.0
+        ports:
+        - containerPort: 80
+        resources:
+          requests:
+            cpu: "5m"       
+            memory: "5Mi"            
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: vpa-demo-service-nginx
+  labels:
+    app: vpa-nginx
+spec:
+  type: NodePort
+  selector:
+    app: vpa-nginx
+  ports:
+  - port: 80
+    targetPort: 80
+    nodePort: 31232
+   

16-EKS-VPA-Vertical-Pod-Autoscaler/kube-manifests/02-VPA-Manifest.yml

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+apiVersion: "autoscaling.k8s.io/v1beta2"
+kind: VerticalPodAutoscaler
+metadata:
+  name: kubengix-vpa
+spec:
+  targetRef:
+    apiVersion: "apps/v1"
+    kind: Deployment
+    name: vpa-demo-deployment
+  resourcePolicy:
+    containerPolicies:
+      - containerName: '*'
+        minAllowed:
+          cpu: 5m
+          memory: 5Mi
+        maxAllowed:
+          cpu: 1
+          memory: 500Mi
+        controlledResources: ["cpu", "memory"]