hpademo is a simple demo for Kubernetes Horizontal Pod Autoscaler (HPA), written in Go and compiled to WebAssembly in order to run in a web browser.

Online demo: https://udhos.github.io/hpademo/www/

• Simulate HPA based on CPU.
• Chart for number of replicas.
• Chart for per-pod CPU usage.
• Chart for total unmet CPU load.
• Dark/light modes.
• Customizable:
  • Inject total CPU usage.
  • POD CPU request.
  • POD CPU limit.
  • HPA min replicas.
  • HPA max replicas.
  • HPA targe cpu utilization percentage.
  • Chart data history size (300s default).
  • Scale down stabilization window (300s default).
  • POD startup time.
  • POD stop time.
• Non-customizable:
  • 10% HPA Scale Tolerance.
  • 15s HPA Scale Period.

git clone https://github.com/udhos/hpademo
cd hpademo

Set GOOS=js GOARCH=wasm before starting your editor/IDE.

export GOOS=js GOARCH=wasm
code .

./test.sh

./build.sh

./run-serve-www.sh

Then open your web browser at http://localhost:8080