subdomain routing

ingress.yaml

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: ingress
  namespace: app1
  labels:
    name: ingress
  annotations:
    kubernetes.io/ingress.class: nginx
    nginx.ingress.kubernetes.io/ssl-redirect: "false"
    nginx.ingress.kubernetes.io/rewrite-target: /
spec:
  rules:
    - host: app1.mydomain.com
      http:
        paths:
        - backend: 
            service:
                  name: my-app
                  port: 
                    number: 3000
          pathType: Prefix
          path: /