Stand alone ALB Cloudformation setup. For ECS service to consume.

ALB-template.yaml

Resources:

  # ============================ Application Load Balancer ============================

  LoadBalancer:
    Type: AWS::ElasticLoadBalancingV2::LoadBalancer
    Properties:
      Name: !Ref AWS::StackName
      Scheme: internet-facing
      Subnets: !Split
        - ','
        - "Fn::ImportValue":
            "Fn::Sub": "${NetworkStackName}-PublicSubnets"
      SecurityGroups:
          - !ImportValue
              "Fn::Sub": "${ECSCLusterStackName}-LoadBalancerSecurityGroup"
      LoadBalancerAttributes:
      - Key: idle_timeout.timeout_seconds
        Value: '30'
      Tags:
        - Key: Name
          Value: !Ref AWS::StackName

  LoadBalancerListener:
    Type: AWS::ElasticLoadBalancingV2::Listener
    Properties:
      LoadBalancerArn: !Ref LoadBalancer
      Port: 80
      # Protocol: HTTPS
      Protocol: HTTP
      Certificates:
        - CertificateArn: !ImportValue
            "Fn::Sub": "${CertificatesStackName}-StudyABitCertificate"
      DefaultActions:
        - Type: forward
          TargetGroupArn: !Ref DefaultTargetGroup

  # # We define a default target group here, as this is a mandatory Parameters
  # # when creating an Application Load Balancer Listener. This is not used, instead
  # # a target group is created per-service in each service template
  DefaultTargetGroup:
    Type: AWS::ElasticLoadBalancingV2::TargetGroup
    Properties:
      Name: default
      VpcId: !ImportValue
        "Fn::Sub": "${NetworkStackName}-VPC"
      Port: 80
      Protocol: HTTP