ingress nginx www redirect

ingress.yaml

apiVersion: networking.k8s.io/v1beta1
kind: Ingress
metadata:
  annotations:
    kubernetes.io/ingress.class: nginx
    nginx.ingress.kubernetes.io/configuration-snippet: |
      if ($host = "www.example.com") {
          return 308 https://example.com$request_uri;
      }
  name: example-www
  namespace: example
spec:
  rules:
  - host: www.example.com
  tls:
  - secretName: example-www-tls
---
apiVersion: cert-manager.io/v1alpha3
kind: Certificate
metadata:
  name: example-www
  namespace: example
spec:
  commonName: www.example.com
  dnsNames:
  - www.example.com
  issuerRef:
    kind: ClusterIssuer
    name: letsencrypt
  secretName: example-www-tls