Horizontal Pod Autoscaler

A sample project showcasing various Horizontal Pod Autoscaler implementations.

Blog Posts

• Horizontal Pod Autoscaler in Kubernetes (Part 1) — Simple Autoscaling using Metrics Server
• Horizontal Pod Autoscaler in Kubernetes (Part 2) — Advanced Autoscaling using Prometheus Adapter

Installing

Autoscaling Golang service using Metrics Server

kind create cluster --image kindest/node:v1.27.3 --config=kind/cluster.yaml

helm repo add ingress-nginx https://kubernetes.github.io/ingress-nginx
helm install ingress-nginx/ingress-nginx --name-template ingress-nginx --create-namespace -n ingress-nginx --values kind/ingress-nginx-values.yaml --version 4.8.3 --wait

helm repo add metrics-server https://kubernetes-sigs.github.io/metrics-server
helm install metrics-server/metrics-server --name-template metrics-server --create-namespace -n metrics-server --values kind/metrics-server-values.yaml --version 3.11.0 --wait

helm install golang-sample-app/helm-chart --name-template sample-app --create-namespace -n sample-app --wait

Autoscaling Kotlin service using Metrics Server

kind create cluster --image kindest/node:v1.27.3 --config=kind/cluster.yaml

helm repo add ingress-nginx https://kubernetes.github.io/ingress-nginx
helm install ingress-nginx/ingress-nginx --name-template ingress-nginx --create-namespace -n ingress-nginx --values kind/ingress-nginx-values.yaml --version 4.8.3 --wait

helm repo add metrics-server https://kubernetes-sigs.github.io/metrics-server
helm install metrics-server/metrics-server --name-template metrics-server --create-namespace -n metrics-server --values kind/metrics-server-values.yaml --version 3.11.0 --wait

helm install kotlin-sample-app/helm-chart --name-template sample-app --create-namespace -n sample-app --wait

Autoscaling Golang service using Prometheus Adapter

kind create cluster --image kindest/node:v1.27.3 --config=kind/cluster.yaml

helm repo add ingress-nginx https://kubernetes.github.io/ingress-nginx
helm install ingress-nginx/ingress-nginx --name-template ingress-nginx --create-namespace -n ingress-nginx --values kind/ingress-nginx-values.yaml --version 4.8.3 --wait

helm repo add prometheus-community https://prometheus-community.github.io/helm-charts
helm install prometheus-community/kube-prometheus-stack --name-template prometheus --create-namespace -n prometheus --version 54.2.2 --wait
helm install prometheus-community/prometheus-adapter --name-template prometheus-adapter --create-namespace -n prometheus-adapter --values kind/prometheus-adapter-values.yaml --version 4.9.0 --wait

helm install golang-sample-app/helm-chart --name-template sample-app --create-namespace -n sample-app --set prometheus.enabled=true --wait

Smoke Testing

curl localhost/success -H "Host: sample.app" -v
curl localhost/error -H "Host: sample.app" -v

Load Testing

k6 run k6/script.js

Uninstalling

kind delete cluster