AWS::ElasticLoadBalancingV2::TargetGroup

Properties

• https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-elasticloadbalancingv2-targetgroup.html

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

TargetGroupAttributes

• stickiness.enabled
• Also known as session affinity
• Stickiness can be enabled for ALB and CLB
• To implement session affinity/stickiness, a cookie is used with an expiration date (this way user won't lose the session data)
  • AWSALBAPP: application-based (generated by the app)
  • AWSALB: duration-based (generated by the lb)
• The session affinity is enabled at the target group
• deregistration_delay.timeout_seconds
• Connection Draining (CLB) or Deregistration Delay (ALB & NLB)
• It's the time to wait for an instance to be drained (to no long accept new requests)
• It's necessary when an instance will be removed from the target group
• Default is 300 seconds

TargetType

• Instance
• IP (private IP)
• Lambda function