title: Unable to use cert-manager and nginx ingress controller with SSL termination
body: <p>I am trying out nginx-ingress on GKE with SSL termination for use cases. I've traveled to millions of blogs on this process which uses cert-manager with nginx ingress controller but none of them worked in my case.</p>
  
  <p>This certainly means I am doing something wrong. But I am not sure what. Here's what I did:</p>
  
  <ol>
  <li>Create sample app exposed on ClusterIP</li>
  <li>Deploy nginx-ingress</li>
  <li>Create issuer</li>
  <li>Create nginx ingress with issuer.</li>
  </ol>
  
  <p>Result:</p>
  
  <p>After describing the nginx ingress, the events areas shows <code>none</code>. That means everything is completely blank. Not a single thing happened for requesting certs, http validation, etc.</p>
  
  <p>nginx ingress:</p>
  
  <pre><code>apiVersion: extensions/v1beta1
  kind: Ingress
  metadata:
      name: my-ingress
      annotations:
          kubernetes.io/ingress.class: nginx
          certmanager.k8s.io/cluster-issuer: letsencrypt-staging
          kubernetes.io/tls-acme: 'true'
  spec:
      rules:
          -
              host: wptls.ml
              http: {paths: [{path: /, backend: {serviceName: web, servicePort: 80}}]}
      tls:
          -
              secretName: tls-staging-cert
              hosts: [wptls.ml]
  </code></pre>
  
  <p>clusterissuer.yml:</p>
  
  <pre><code>apiVersion: certmanager.k8s.io/v1alpha1
  kind: ClusterIssuer
  metadata:
      name: letsencrypt-staging
  spec:
      acme:
          server: 'https://acme-staging-v02.api.letsencrypt.org/directory'
          email: xyz@gmail.com
          privateKeySecretRef:
              name: letsencrypt-sec-staging
          http01: {}
  </code></pre>
  
  <p>I am not sure if there's anything else which needs to be done.</p>