Example - Nested stack: Root stack template

AWSTemplateFormatVersion: "2010-09-09"

Description: AWS CloudFormation workshop - Nested stacks - Root template (uksb-1q9p31idr).

Parameters:
  AvailabilityZones:
    Type: List<AWS::EC2::AvailabilityZone::Name>
    Description: The list of Availability Zones to use for the subnets in the VPC. Select 2 AZs.

  VPCName:
    Type: String
    Description: The name of the VPC.
    Default: cfn-workshop-vpc

  VPCCidr:
    Type: String
    Description: The CIDR block for the VPC.
    AllowedPattern: ^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])(\/([0-9]|[1-2][0-9]|3[0-2]))$
    ConstraintDescription: CIDR block parameter must be in the form x.x.x.x/16-28
    Default: 10.0.0.0/16

  PublicSubnet1Cidr:
    Type: String
    Description: The CIDR block for the public subnet located in Availability Zone 1.
    AllowedPattern: ^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])(\/([0-9]|[1-2][0-9]|3[0-2]))$
    ConstraintDescription: CIDR block parameter must be in the form x.x.x.x/16-28
    Default: 10.0.0.0/24

  PublicSubnet2Cidr:
    Type: String
    Description: The CIDR block for the public subnet located in Availability Zone 2.
    AllowedPattern: ^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])(\/([0-9]|[1-2][0-9]|3[0-2]))$
    ConstraintDescription: CIDR block parameter must be in the form x.x.x.x/16-28
    Default: 10.0.1.0/24

  EnvironmentType:
    Description: 'Specify the Environment type of the stack.'
    Type: String
    Default: Test
    AllowedValues:
      - Dev
      - Test
      - Prod
    ConstraintDescription: 'Specify either Dev, Test or Prod.'

Resources:
  VpcStack:
    Type: AWS::CloudFormation::Stack
    Properties:
      TemplateURL: ./vpc.yaml
      TimeoutInMinutes: 20
      Parameters:
        AvailabilityZones:
          Fn::Join:
            - ','
            - !Ref AvailabilityZones
        VPCCidr: !Ref VPCCidr
        VPCName: !Ref VPCName
        PublicSubnet1Cidr: !Ref PublicSubnet1Cidr
        PublicSubnet2Cidr: !Ref PublicSubnet2Cidr

  IamStack:
    Type: AWS::CloudFormation::Stack
    Properties:
      TemplateURL: ./iam.yaml
      TimeoutInMinutes: 10

  EC2Stack:
    Type: AWS::CloudFormation::Stack
    Properties:
      TemplateURL: ./ec2.yaml
      TimeoutInMinutes: 20
      Parameters:
        EnvironmentType: !Ref EnvironmentType
        VpcId: !GetAtt VpcStack.Outputs.VpcId
        SubnetId: !GetAtt VpcStack.Outputs.PublicSubnet1
        WebServerInstanceProfile: !GetAtt IamStack.Outputs.WebServerInstanceProfile

Outputs:
  WebsiteURL:
    Value: !GetAtt EC2Stack.Outputs.WebsiteURL