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