@aws-cdk/aws_elasticloadbalancingv2-CfnTargetGroup:: Not able to add *target_group_attributes*

General Issue

target_group_attributes create/update fails

The Question

I’m trying to create a Loadbalancer for already existing instances, with CfnTargetGroup and enabling the target_group_attributes(https://docs.aws.amazon.com/cdk/api/latest/python/aws_cdk.aws_elasticloadbalancingv2/CfnTargetGroup.html#aws_cdk.aws_elasticloadbalancingv2.CfnTargetGroup.target_group_attributes).

        target_groups = lbv2.CfnTargetGroup (self, "target_group",
                                            name = config.target_groups.name + environment,
                                            port = config.target_groups.port,
                                            protocol = config.target_groups.protocol,
                                            protocol_version = config.target_groups.protocol_version,
                                            target_type = "instance",
                                            targets = [targets],
                                            vpc_id=vpc.vpc_id,
                                            health_check_enabled = True,
                                            health_check_interval_seconds = 5,
                                            matcher = {"HttpCode" :"200"} ,        # Validate the LB health 
                                            target_group_attributes = [{"Key":"stickiness.enabled" , "Value" : "true"}]

This is the error I’m getting, not sure what am I missing here

EC2Stackdevelopment: creating CloudFormation changeset...
11:09:02 AM | UPDATE_FAILED        | AWS::ElasticLoadBalancingV2::TargetGroup  | targetgroup
1 validation error detected: Value null at 'attributes' failed to satisfy constraint: Member must not be null (Service: AmazonElasticLoadBalancing; Status Code: 400; Error Code: ValidationError; Request ID: 21a19d89-8942-4a11-b4ee-5cbbf6a5452e; Proxy: null)

	/private/var/folders/19/mv6krhlx2lndqhy71b88zhxc0000gn/T/tmprk9fhl1_/lib/program.js:8367:58

CDK CLI Version

1.126.0 (build f004e1a)

Framework Version

No response

Node.js Version

No response

OS

mac

Language

Python

Language Version

Python 3.9.7

Other information

If I enable all of them

target_group_attributes = [{"Key":"stickiness.enabled" , "Value" : "true"},{"Key":"stickiness.type" , "Value" : "lb_cookie"},{"Key":"slow_start.duration_seconds" , "Value" : "0"},{"Key":"stickiness.lb_cookie.duration_seconds" , "Value" : "86400"},{"Key":"load_balancing.algorithm.type" , "Value" : "round_robin"}]

I’m getting below error

 9:47:57 AM | CREATE_FAILED        | AWS::ElasticLoadBalancingV2::TargetGroup  | targetgroup
Property TargetGroupAttributes contains duplicate values.

There is no duplicate value i can find in them

[ns-ajith]

Ahhh that makes sense and thank you so much for explaining it with examples. Really appreciated.

[github-actions[bot]]

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