It seems like the best way to deploy a external facing application on Google Cloud would be to create an external load balancer with this line in the service configuration:

{ ... "createExternalLoadBalancer": true ... }

This doesn't seem to work for AWS. I'm getting the following error when running the service create:

requested an external service, but no cloud provider supplied

I know about the PublicIPs setting in services, but that would involve knowing the service's IP in advance so I can set a domain name to it, but so far that doesn't look to be possible if I want to set it up using an external service like AWS ELB.

What's the recommended way of doing this on AWS?