AWS::ElasticLoadBalancingV2::TargetGroup - AWS CloudFormation
SyntaxPropertiesReturn valuesExamplesSee also

AWS::ElasticLoadBalancingV2::TargetGroup

Specifies a target group for an Application Load Balancer, a Network Load Balancer, or a Gateway Load Balancer.

Before you register a Lambda function as a target, you must create a AWS::Lambda::Permission resource that grants the Elastic Load Balancing service principal permission to invoke the Lambda function.

Syntax

To declare this entity in your AWS CloudFormation template, use the following syntax:

JSON

{
  "Type" : "AWS::ElasticLoadBalancingV2::TargetGroup",
  "Properties" : {
      "HealthCheckEnabled" : Boolean,
      "HealthCheckIntervalSeconds" : Integer,
      "HealthCheckPath" : String,
      "HealthCheckPort" : String,
      "HealthCheckProtocol" : String,
      "HealthCheckTimeoutSeconds" : Integer,
      "HealthyThresholdCount" : Integer,
      "IpAddressType" : String,
      "Matcher" : Matcher,
      "Name" : String,
      "Port" : Integer,
      "Protocol" : String,
      "ProtocolVersion" : String,
      "Tags" : [ Tag, ... ],
      "TargetGroupAttributes" : [ TargetGroupAttribute, ... ],
      "Targets" : [ TargetDescription, ... ],
      "TargetType" : String,
      "UnhealthyThresholdCount" : Integer,
      "VpcId" : String
    }
}

YAML

Type: AWS::ElasticLoadBalancingV2::TargetGroup
Properties:
  HealthCheckEnabled: Boolean
  HealthCheckIntervalSeconds: Integer
  HealthCheckPath: String
  HealthCheckPort: String
  HealthCheckProtocol: String
  HealthCheckTimeoutSeconds: Integer
  HealthyThresholdCount: Integer
  IpAddressType: String
  Matcher: 
    Matcher
  Name: String
  Port: Integer
  Protocol: String
  ProtocolVersion: String
  Tags: 
    - Tag
  TargetGroupAttributes: 
    - TargetGroupAttribute
  Targets: 
    - TargetDescription
  TargetType: String
  UnhealthyThresholdCount: Integer
  VpcId: String

Properties

HealthCheckEnabled

Indicates whether health checks are enabled. If the target type is lambda, health checks are disabled by default but can be enabled. If the target type is instance, ip, or alb, health checks are always enabled and can't be disabled.

Required: No

Type: Boolean

Update requires: No interruption

HealthCheckIntervalSeconds

The approximate amount of time, in seconds, between health checks of an individual target. The range is 5-300. If the target group protocol is TCP, TLS, UDP, TCP_UDP, HTTP or HTTPS, the default is 30 seconds. If the target group protocol is GENEVE, the default is 10 seconds. If the target type is lambda, the default is 35 seconds.

Required: No

Type: Integer

Minimum: 5

Maximum: 300

Update requires: No interruption

HealthCheckPath

[HTTP/HTTPS health checks] The destination for health checks on the targets.

[HTTP1 or HTTP2 protocol version] The ping path. The default is /.

[GRPC protocol version] The path of a custom health check method with the format /package.service/method. The default is /AWS.ALB/healthcheck.

Required: No

Type: String

Minimum: 1

Maximum: 1024

Update requires: No interruption

HealthCheckPort

The port the load balancer uses when performing health checks on targets. If the protocol is HTTP, HTTPS, TCP, TLS, UDP, or TCP_UDP, the default is traffic-port, which is the port on which each target receives traffic from the load balancer. If the protocol is GENEVE, the default is port 80.

Required: No

Type: String

Update requires: No interruption

HealthCheckProtocol

The protocol the load balancer uses when performing health checks on targets. For Application Load Balancers, the default is HTTP. For Network Load Balancers and Gateway Load Balancers, the default is TCP. The TCP protocol is not supported for health checks if the protocol of the target group is HTTP or HTTPS. The GENEVE, TLS, UDP, and TCP_UDP protocols are not supported for health checks.

Required: No

Type: String

Allowed values: HTTP | HTTPS | TCP | TLS | UDP | TCP_UDP | GENEVE

Update requires: No interruption

HealthCheckTimeoutSeconds

The amount of time, in seconds, during which no response from a target means a failed health check. The range is 2–120 seconds. For target groups with a protocol of HTTP, the default is 6 seconds. For target groups with a protocol of TCP, TLS or HTTPS, the default is 10 seconds. For target groups with a protocol of GENEVE, the default is 5 seconds. If the target type is lambda, the default is 30 seconds.

Required: No

Type: Integer

Minimum: 2

Maximum: 120

Update requires: No interruption

HealthyThresholdCount

The number of consecutive health check successes required before considering a target healthy. The range is 2-10. If the target group protocol is TCP, TCP_UDP, UDP, TLS, HTTP or HTTPS, the default is 5. For target groups with a protocol of GENEVE, the default is 5. If the target type is lambda, the default is 5.

Required: No

Type: Integer

Minimum: 2

Maximum: 10

Update requires: No interruption

IpAddressType

The IP address type. The default value is ipv4.

Required: No

Type: String

Allowed values: ipv4 | ipv6

Update requires: Replacement

Matcher

[HTTP/HTTPS health checks] The HTTP or gRPC codes to use when checking for a successful response from a target. For target groups with a protocol of TCP, TCP_UDP, UDP or TLS the range is 200-599. For target groups with a protocol of HTTP or HTTPS, the range is 200-499. For target groups with a protocol of GENEVE, the range is 200-399.

Required: No

Type: Matcher

Update requires: No interruption

Name

The name of the target group.

This name must be unique per region per account, can have a maximum of 32 characters, must contain only alphanumeric characters or hyphens, and must not begin or end with a hyphen.

Required: No

Type: String

Update requires: Replacement

Port

The port on which the targets receive traffic. This port is used unless you specify a port override when registering the target. If the target is a Lambda function, this parameter does not apply. If the protocol is GENEVE, the supported port is 6081.

Required: Conditional

Type: Integer

Minimum: 1

Maximum: 65535

Update requires: Replacement

Protocol

The protocol to use for routing traffic to the targets. For Application Load Balancers, the supported protocols are HTTP and HTTPS. For Network Load Balancers, the supported protocols are TCP, TLS, UDP, or TCP_UDP. For Gateway Load Balancers, the supported protocol is GENEVE. A TCP_UDP listener must be associated with a TCP_UDP target group. If the target is a Lambda function, this parameter does not apply.

Required: Conditional

Type: String

Allowed values: HTTP | HTTPS | TCP | TLS | UDP | TCP_UDP | GENEVE

Update requires: Replacement

ProtocolVersion

[HTTP/HTTPS protocol] The protocol version. The possible values are GRPC, HTTP1, and HTTP2.

Required: No

Type: String

Update requires: Replacement

Tags

The tags.

Required: No

Type: Array of Tag

Minimum: 1

Update requires: No interruption

TargetGroupAttributes

The target group attributes.

Required: No

Type: Array of TargetGroupAttribute

Update requires: No interruption

Targets

The targets.

Required: No

Type: Array of TargetDescription

Update requires: No interruption

TargetType

The type of target that you must specify when registering targets with this target group. You can't specify targets for a target group using more than one target type.

  • instance - Register targets by instance ID. This is the default value.

  • ip - Register targets by IP address. You can specify IP addresses from the subnets of the virtual private cloud (VPC) for the target group, the RFC 1918 range (10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16), and the RFC 6598 range (100.64.0.0/10). You can't specify publicly routable IP addresses.

  • lambda - Register a single Lambda function as a target.

  • alb - Register a single Application Load Balancer as a target.

Required: No

Type: String

Allowed values: instance | ip | lambda | alb

Update requires: Replacement

UnhealthyThresholdCount

The number of consecutive health check failures required before considering a target unhealthy. The range is 2-10. If the target group protocol is TCP, TCP_UDP, UDP, TLS, HTTP or HTTPS, the default is 2. For target groups with a protocol of GENEVE, the default is 2. If the target type is lambda, the default is 5.

Required: No

Type: Integer

Minimum: 2

Maximum: 10

Update requires: No interruption

VpcId

The identifier of the virtual private cloud (VPC). If the target is a Lambda function, this parameter does not apply. Otherwise, this parameter is required.

Required: Conditional

Type: String

Update requires: Replacement

Return values

Ref

When you pass the logical ID of this resource to the intrinsic Ref function, Ref returns the Amazon Resource Name (ARN) of the target group.

For more information about using the Ref function, see Ref.

Fn::GetAtt

The Fn::GetAtt intrinsic function returns a value for a specified attribute of this type. The following are the available attributes and sample return values.

For more information about using the Fn::GetAtt intrinsic function, see Fn::GetAtt.

LoadBalancerArns

The Amazon Resource Name (ARN) of the load balancer that routes traffic to this target group.

TargetGroupArn

The Amazon Resource Name (ARN) of the target group.

TargetGroupFullName

The full name of the target group. For example, targetgroup/my-target-group/cbf133c568e0d028.

TargetGroupName

The name of the target group. For example, my-target-group.

Examples

The following example creates a target group where the target is a Lambda function.

YAML

Resources:
  MyLambdaInvokePermission:
    Type: AWS::Lambda::Permission
    Properties:
      FunctionName: !GetAtt 
        - MyLambdaFunction
        - Arn
      Action: 'lambda:InvokeFunction'
      Principal: elasticloadbalancing.amazonaws.com

  MyTargetGroup:
    Type: AWS::ElasticLoadBalancingV2::TargetGroup
    Properties:
      HealthCheckEnabled: false
      Name: MyTargets
      TargetType: lambda
      Targets:
      - Id: !GetAtt [ MyLambdaFunction, Arn ]

  MyLambdaFunction:
    Type: "AWS::Lambda::Function"
    Properties:
      Handler: "index.handler"
      Role: !GetAtt [ LambdaExecutionRole, Arn ]
      Code:
        ZipFile: !Sub |
          import json
          
          def handler(event, context):
            response = {
              "statusCode": 200,
              "statusDescription": "200 OK",
              "isBase64Encoded": False,
              "headers": {
                "Content-Type": "text/html; charset=utf-8"
              }
            }

            response['body'] = """<html>
            <head>
            <title>Hello World!</title>
            <style>
            html, body {
              margin: 0; padding: 0;
              font-family: arial; font-weight: 700; font-size: 3em;
              text-align: center;
            }
            </style>
            </head>
            <body>
            <p>Hello World from Lambda</p>
            </body>
            </html>"""
            return response      
      Runtime: "python3.6"
      Timeout: "25"

  LambdaExecutionRole:
    Type: "AWS::IAM::Role"
    Properties:
      AssumeRolePolicyDocument:
        Version: "2012-10-17"
        Statement:
          - Effect: Allow
            Principal:
              Service: lambda.amazonaws.com
            Action: "sts:AssumeRole"

See also