You will need to build an image you can use.

packer build packer.json

Once done building, put the AMI id in terraform.tfvars

Run terraform apply

When it errors out, run terraform output

Take the server IPs and invoke the cluster initialization:

./init_cluster.sh IP1 IP2 IP3

Then run terraform apply again.

A walk through of this proof of concept can be found here: https://www.youtube.com/watch?v=zjQXSTqTKl4