Sandwich example

sandbox.yml

region: us-east-1
hosted_zone: &hosted_zone cotap.com
key_name: &key_name sandbox_environment

cidr_block: &cidr_block "10.123"
azs: &azs "us-east-1a,us-east-1c,us-east-1d"
az1: &az1 "us-east-1a"
az2: &az2 "us-east-1c"
az3: &az3 "us-east-1d"

ami_ebs: &ami_ebs ami-123456
ami_instance_store: &ami_instance_store ami-abcdefg
ami_nat: &ami_nat ami-abcd1234

stacks:
  - name: VPC
    template: vpc.json
    parameters:
    - param_name: CIDRBlock
      value: *cidr_block

  - name: PublicSubnets
    template: public-subnets.json
    parameters:
    - param_name: InternetGateway
      value:
        stack: VPC
        output: InternetGateway
    - param_name: VpcId
      value:
        stack: VPC
        output: VpcId
    - param_name: AZ1
      value: *az1
    - param_name: AZ2
      value: *az2
    - param_name: AZ3
      value: *az3
    - param_name: CIDRBlock
      value: *cidr_block

  - name: PrivateSubnets
    template: private-subnets.json
    parameters:
    - param_name: VpcId
      value:
        stack: VPC
        output: VpcId
    - param_name: AZ1
      value: *az1
    - param_name: AZ2
      value: *az2
    - param_name: AZ3
      value: *az3
    - param_name: CIDRBlock
      value: *cidr_block

  - name: NAT
    template: nat.json
    parameters:
    - param_name: KeyName
      value: *key_name
    - param_name: InstanceImageId
      value: *ami_nat
    - param_name: InstanceType
      value: "m1.small"
    - param_name: VpcId
      value:
        stack: VPC
        output: VpcId
    - param_name: PublicSubnet
      value:
        stack: PublicSubnets
        output: SubnetIdAZ1
    - param_name: PrivateRouteTable
      value:
        stack: PrivateSubnets
        output: PrivateSubnetRouteTable
    - param_name: CIDRBlock
      value: *cidr_block