hello-node

A minimal webserver that returns the hostname. Useful for teaching and debugging K8s networking.

Available as:

• docker.io/levaitamas/hello-node
• ghcr.io/levaitamas/hello-node

Usage examples

1. Create a deployment and a LoadBalancer service:

apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    app: hello
  name: hello
spec:
  replicas: 2
  selector:
    matchLabels:
      app: hello
  template:
    metadata:
      labels:
        app: hello
    spec:
      containers:
      - name: hello
        image: ghcr.io/levaitamas/hello-node
---
apiVersion: v1
kind: Service
metadata:
  name: hello
spec:
  type: LoadBalancer
  ports:
  - port: 8080
  selector:
    app: hello

2. Check connectivity:

$ curl $(kubectl get service hello -o jsonpath='{.status.loadBalancer.ingress[0].ip}'):8080
Hello World from hello-6bcc85747b-mxwl4!

K8s container networking

A short course on Kubernetes container networking: http://lendulet.tmit.bme.hu/~levai/k8s/kubernetes_intro_aws.html

Acknowledgments

Original idea and first implementation from rg0now.

License

Licensed under GPLv3+.