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I am trying to configure WAS 8.5 on EC2, but what I find is that the EC2 hostname changes on each restart. So basically, I've created a WAS instance on ec2-54-200-56-168.us-west-2.compute.amazonaws.com, and then after restart the server (and IP of course) changes to ec2-54-200-55-7.us-west-2.compute.amazonaws.com
Of course WAS needs the hostname in its cell configuration. But also, if the host names keep changing I don't understand how to set up two servers to talk to each other.
The solution from David is not correct. The Elastic IP (and hostname) change in EC2 Classic (non VPC), so it won't do the trick. The IP/hostname with EC2 classic will change after each stop/reboot.
The only solution I think would work is to use the VPC, and then use an Elastic IP, which persists for the lifetime of an instance.
You can associate an Elastic IP with your EC2 instance. This will give it a fixed IP address, as well as a public DNS that doesn't change after restart.