Greyhound is a point cloud streaming server. It should be considered deprecated for now. Use Entwine and Entwine Point Tile directly if you just want to serve point cloud web services.
Install docker on an EC2 instance, write Entwine data to the local EBS volume or to S3 depending the size of your data, and then run Greyhound via Docker in EC2. You'll need to be more specific beyond that - you'd run it the same way as you run locally, but in AWS's infrastructure.
The Greyhound back-end serving speck.ly and potree.entwine.io is a c3.2xlarge instance, by the way. I recommend the c3 line of instances for Greyhound/Entwine stuff.
Install docker on an EC2 instance, write Entwine data to the local EBS volume or to S3 depending the size of your data, and then run Greyhound via Docker in EC2. You'll need to be more specific beyond that - you'd run it the same way as you run locally, but in AWS's infrastructure.