Deploy a high-availability web app using CloudFormation
$ sh create.sh <cloudformation_network_stack_name> network.yml network-parameters.json
$ sh update.sh <cloudformation_network_stack_name> network.yml network-parameters.json
$ sh create.sh <cloudformation_server_stack_name> servers.yml server-parameters.json
$ sh update.sh <cloudformation_server_stack_name> servers.yml server-parameters.json
$ aws cloudformation delete-stack --stack-name <cloudformation_stack_name>