alb.yml

Description:
  Load Balancer, Listeners and default rules

Parameters:
  Environment:
    Type: String
    Default: develop
  VPCId:
    Type: String
  PublicSubnets:
    Type: CommaDelimitedList
    

Resources:
  LoadBalancer:
    Type: AWS::ElasticLoadBalancingV2::LoadBalancer
    Properties:
      Name: !Sub "${Environment}-alb"
      Subnets: !Ref PublicSubnets
      SecurityGroups:
        - !Ref LoadBalancerSecurityGroup
      Tags:
        - Key: Env
          Value: !Ref Environment

  ELBDefaultListener:
    Type: AWS::ElasticLoadBalancingV2::Listener
    Properties:
      LoadBalancerArn: !Ref LoadBalancer
      Port: 80
      Protocol: HTTP
      DefaultActions:
        - Type: forward
          TargetGroupArn: !Ref DefaultTargetGroup


  DefaultTargetGroup:
    Type: AWS::ElasticLoadBalancingV2::TargetGroup
    Properties:
      Port: 80
      Protocol: HTTP
      Matcher:
        HttpCode: 200-399
      HealthCheckPath: "/"
      VpcId: !Ref VPCId
      HealthCheckProtocol: HTTP
      HealthCheckIntervalSeconds: 20
      HealthCheckTimeoutSeconds: 10
      HealthyThresholdCount: 10
      UnhealthyThresholdCount: 10

  LoadBalancerSecurityGroup:
    Type: AWS::EC2::SecurityGroup
    Properties:
      GroupDescription: Security group for the Load Balancer
      VpcId: !Ref VPCId
      SecurityGroupIngress:
        - CidrIp: 0.0.0.0/0
          FromPort: 80
          IpProtocol: tcp
          ToPort: 80
      Tags:
        - Key: Name
          Value: !Sub "elb-allow-web-${Environment}"
        - Key: Env
          Value: !Ref Environment

Outputs:
  LoadBalancerArn:
    Value: !Ref LoadBalancer
    Export:
      Name: !Sub "${Environment}-LoadBalancerArn"
  HTTPListenerArn:
    Value: !Ref ELBDefaultListener
    Export:
      Name: !Sub "${Environment}-HTTPListenerArn"
  LoadBalancerZone:
    Value: !GetAtt LoadBalancer.CanonicalHostedZoneID
  LoadBalancerUrl:
    Value: !GetAtt LoadBalancer.DNSName
  LoadBalancerSecurityGroupId:
    Value: !GetAtt LoadBalancerSecurityGroup.GroupId
    Export:
      Name: !Sub "${Environment}-LoadBalancerSecurityGroupId"
  TargetGroupName:
    Description: A reference to a port 80 listener
    Value: !Ref DefaultTargetGroup
    Export:
      Name: !Sub "${Environment}-DefaultTargetGroup"    
  LoadBalacnerDNS:
    Description: A reference to a loab balancer dns
    Value: !GetAtt LoadBalancer.DNSName
    Export:
      Name: !Sub "${Environment}-LoadBalacnerDNS"