Not able to add multiple target_id inside targer group using terraform

问题

I'm trying to create target groups and attach multiple machines to the target groups using terraform script.

I'm not able to attach multiple target_id please help me to achieve this.

回答1:

As of Terraform 0.12, this could simply be

resource "aws_alb_target_group_attachment" "test" {
  count = length(aws_instance.test)
  target_group_arn = aws_alb_target_group.test.arn
  target_id = aws_instance.test[count.index].id
}

assuming aws_instance.test returns a list.

https://blog.gruntwork.io/terraform-tips-tricks-loops-if-statements-and-gotchas-f739bbae55f9 is an excellent reference.

回答2:

Thanks for your quick reply.

Actually giving seperate tag like test1 and test2 for aws_alb_target_group_attachment helped me to add multiple target instances inside one taget group.

resource "aws_alb_target_group_attachment" "test1" {
  target_group_arn = "${aws_alb_target_group.test.arn}"
  port             = 8080
  target_id        = "${aws_instance.inst1.id}"
}
resource "aws_alb_target_group_attachment" "test2" {
  target_group_arn = "${aws_alb_target_group.test.arn}"
  port             = 8080
  target_id        = "${aws_instance.inst2.id}"
}

回答3:

Below code actually works for me.

resource "aws_alb_target_group_attachment" "test" {
  count = 3 #This can be passed as variable.
  target_group_arn = "${aws_alb_target_group.test.arn}"
  target_id         = "${element(split(",", join(",", aws_instance.web.*.id)), count.index)}"
}

Ref:

https://github.com/terraform-providers/terraform-provider-aws/issues/357 https://groups.google.com/forum/#!msg/terraform-tool/Mr7F3W8WZdk/ouVR3YsrAQAJ

回答4:

Try creating a list of instance ID's and then iterate over using the count index.

For example:

variable "instance_list" {
  description = "Push these instances to ALB"
  type = "list"
  default = ["i00001", "i00002", "i00003"]
}

resource "aws_alb_target_group_attachment" "test" {
  count            = "${var.instance_list}"
  target_group_arn = "${aws_alb_target_group.test.arn}"
  target_id        = "${element(var.instance_list, count.index)}"
  port             = 80
}

来源：https://stackoverflow.com/questions/44491994/not-able-to-add-multiple-target-id-inside-targer-group-using-terraform