Using a default wildcard certificate from Let's Encrypt with ingress-nginx

course-snippet.yaml

nginx-ingress:
  values-strings:
    controller:
      extraArgs:
        default-ssl-certificate: "infra/wildcard"

ingress.yaml

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: test
  annotations:
    kubernetes.io/ingress.class: "nginx-ingress"
spec:
  rules:
      - host: wildcard-test.gcp.sudermanjr.hillghost.com
        http:
          paths:
          - backend:
              serviceName: test-service
              servicePort: 80
            path: /
  tls:
    - hosts:
        - wildcard-test.gcp.sudermanjr.hillghost.com

wildcard.yaml

apiVersion: certmanager.k8s.io/v1alpha1
kind: Certificate
metadata:
  name: wildcard
  namespace: infra
spec:
  acme:
    config:
    - dns01:
        provider: clouddns
      domains:
      - '*.gcp.sudermanjr.hillghost.com'
  dnsNames:
  - '*.gcp.sudermanjr.hillghost.com'
  issuerRef:
    kind: ClusterIssuer
    name: cert-manager-setup-production-valid
  secretName: wildcard