用于使用现有目标组配置新 EC2 实例的 AWS CF 模板

Question

I'm trying to provision a new EC2 instance and attaching it to the existing targetGroup which I created earlier. I do have the targetGroupArn , and the new instance details. In all the documents, I could see the sample templates of creating a new instance and new targetgroup and referring the instance id to the creating targetgroup .

Is there any option to create only new instance and attaching it to the existing target group?

So that I can mention the targetGroupArn to which the new instances will be attaching. Below I've mentioned the sample templates, what I'm looking for.

{
  "Type": "AWS::ElasticLoadBalancingV2::TargetGroup",
  "Properties": {
    "TargetGroupArn": "arn:aws:elasticloadbalancing:ap-south-1:4444444444:targetgroup/MyTG/56abcccccccc56",
    "Targets": [
      {
        "Id": {
          "Ref": "ec2Instance1"
        }
      }
    ]
  }
}

Answer 1

Is there any option to create only new instance and attaching it to the existing target group?

Yes, you can do that through a custom resources in the form of a lambda function. The function would use AWS SDK, such as boto3 , to attach the instances to the existing target group.