K3s Kubernetes deployment, service, and ingress configuration for hello-world app, serve app in container on 3000 port, exposed on Node 80 port

k3s-hello-world-app-served-on-80-port-node.yaml

# kubectl apply -f k3s-hello-world-app-served-on-80-port-node.yaml
# kubectl delete -f k3s-hello-world-app-served-on-80-port-node.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: hello-world
  labels:
    app: hello-world
spec:
  replicas: 1
  selector:
    matchLabels:
      app: hello-world
  template:
    metadata:
      labels:
        app: hello-world
    spec:
      containers:
        - name: hello-world
          image: hashicorp/http-echo
          args:
            - "-text=Hello World"
            - "-listen=:3000"
          ports:
            - containerPort: 3000

---
apiVersion: v1
kind: Service
metadata:
  name: hello-world
spec:
  selector:
    app: hello-world
  ports:
    - protocol: TCP
      port: 3000
      targetPort: 3000
  type: ClusterIP

---
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: hello-world-ingress
  annotations:
    # kubernetes.io/ingress.class: "traefik" # Ensure Traefik is used as ingress
spec:
  ingressClassName: traefik
  rules:
    - http:
        paths:
          - path: /
            pathType: Prefix
            backend:
              service:
                name: hello-world
                port:
                  number: 3000
      host: "your-domain.com" # comment this line for IP only Mode, replace with your domain for Domain Mode
  # Optional: Add TLS configuration if you have certificates
  # tls:
  #   - hosts:
  #       - yourdomain.com
  #     secretName: your-tls-secret