Ready to go Consul cluster. From https://medium.com/@spinx/terraforming-aws-setting-up-highly-available-consul-cluster-in-less-than-5min-d1a2524e5882#.t9q20zjey

• Terraform: https://terraform.io/downloads.html
• AWS CLI: http://docs.aws.amazon.com/cli/latest/userguide/installing.html
• Ansible: http://docs.ansible.com/intro_installation.html

make
ansible-galaxy install -r requirements.yml

• Modify credentials.tf with your AWS and Atlas keys. Make sure you don't push this to GitHub!!
• Add key pair to AWS EC2 and modify key_name in credentials.tf
• Modify security_groups.tf where commented DANGER with your IP. If you don't do this, your cluster will be publicly accessible and very insecure!

• terraform plan to see what TF will do
• terraform apply to set up the cluster

When TF is finished you will get the list of servers that were set up and a Consul Web UI URL.

If your AWS account supports EC2 Classic, this won't work for you. You need to specify VPC and Subnet ids to launch the servers in VPC. See here: https://gist.github.com/spinx/047afb19996b91795dd5