https://github.com/udhos/hpademo

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.
https://github.com/udhos/hpademo

go golang hpa kubernetes wasm webassembly

Last synced: 8 months ago
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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.

• Host: GitHub
• URL: https://github.com/udhos/hpademo
• Owner: udhos
• License: mit
• Created: 2025-10-28T00:00:21.000Z (8 months ago)
• Default Branch: main
• Last Pushed: 2025-11-12T21:01:23.000Z (8 months ago)
• Last Synced: 2025-11-12T23:11:15.802Z (8 months ago)
• Topics: go, golang, hpa, kubernetes, wasm, webassembly
• Language: Go
• Homepage:
• Size: 6.67 MB
• Stars: 13
• Watchers: 0
• Forks: 1
• Open Issues: 12
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
[![license](http://img.shields.io/badge/license-MIT-blue.svg)](https://github.com/udhos/hpademo/blob/main/LICENSE)

[![Go Report Card](https://goreportcard.com/badge/github.com/udhos/hpademo)](https://goreportcard.com/report/github.com/udhos/hpademo)

[![Go Reference](https://pkg.go.dev/badge/github.com/udhos/hpademo.svg)](https://pkg.go.dev/github.com/udhos/hpademo)

# hpademo

`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/](https://udhos.github.io/hpademo/www/)

# features

- 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.

# clone

```bash

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

cd hpademo

```

# edit

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

```bash

export GOOS=js GOARCH=wasm

code .

```

# test

```bash

./test.sh

```

# build

```bash

./build.sh

```

# run

```bash

./run-serve-www.sh

```

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