tutorial.yaml

  ApplicationLoadBalancerSecurityGroup:
    Type: AWS::EC2::SecurityGroup # (4)
    Properties:
      GroupDescription: SSH and HTTP
      VpcId: !Ref VPC
      SecurityGroupIngress: # (5)
        - CidrIp: 0.0.0.0/0
          FromPort: 80
          IpProtocol: tcp
          ToPort: 80

  Listener:
    Type: AWS::ElasticLoadBalancingV2::Listener # (6)
    Properties:
      DefaultActions: 
        - Type: forward
          TargetGroupArn: !Ref TargetGroup # (7)
      LoadBalancerArn: !Ref ApplicationLoadBalancer
      Port: 80
      Protocol: HTTP

  TargetGroup:
    Type: AWS::ElasticLoadBalancingV2::TargetGroup # (8)
    Properties:
      Port: 80
      Protocol: HTTP
      VpcId: !Ref VPC
  
    AutoScalingGroup:
      Type: AWS::AutoScaling::AutoScalingGroup
      Properties:
        LaunchConfigurationName: !Ref AppLaunchConfig
        VPCZoneIdentifier:
          - !Ref PublicSubnetA
          - !Ref PublicSubnetB
        DesiredCapacity: 3
        MinSize: 3
        MaxSize: 3
        TargetGroupARNs:
          - !Ref TargetGroup # (9)