@valtteri Does anyone know how to use cloudformation for to fix the internal ip of EC2 instances so that I can put something like this in my hosts file (for hadoop + spark cluster)

# /etc/hosts
172.31.80.0 hadoop-master
172.31.80.1 hadoop-worker-1
172.31.80.2 hadoop-worker-2
172.31.80.3 hadoop-worker-3