anchor.diff:  
   [source,text]
   --------------------------------------------------
  -service_account_scope=compute-rw
  +scopes=compute-rw
   --------------------------------------------------
   
   Failing to set this will result in unauthorized messages when starting Elasticsearch.
  
positive.code: gsutil cp /tmp/e4686d7f5bf904a924ae0cfeb58d0827c6d5b966.image.tar.gz gs://esimage
  
  # Then add your image to images collection:
  gcutil addimage elasticsearch-1-2-1 gs://esimage/e4686d7f5bf904a924ae0cfeb58d0827c6d5b966.image.tar.gz
  
  # If the previous command did not work for you, logout from your instance
  # and launch the same command from your local machine.
  
negative.code: [[cloud-gce-usage-discovery-port-create]]
  ===== When creating instance
  
  Add `--metadata es_port=9301` option:
  
  [source,sh]
  --------------------------------------------------
  # when creating first instance
  gcloud compute instances create myesnode1 \
         --scopes=compute-rw,storage-full \
         --metadata es_port=9301
  
  # when creating an instance from an image
  gcloud compute instances create myesnode2 --image=elasticsearch-1-0-0-RC1 \
         --zone europe-west1-a --machine-type f1-micro --scopes=compute-rw \
         --metadata es_port=9301
  --------------------------------------------------
  
  [[cloud-gce-usage-discovery-port-run]]
  