在 Terraform 中为带有条件的标签连接字符串

Question

I am trying to give my EC2 instances tags as below

resource "aws_instance" "EC2" {

  count = var.instance_count
  key_name               = var.key_name
  ami                    = var.ami
  instance_type          = var.instance_type
  vpc_security_group_ids  = [var.security_group_id]
  subnet_id              = split(",", var.subnet_id)[count.index]
  disable_api_termination = var.disable_api_termination
  instance_initiated_shutdown_behavior = var.instance_initiated_shutdown_behavior
   tags = {
     Name = var.instance_count != 1 ? "var.server_name-${count.index}" : var.server_name
   
  }
  
}

We want to merge the server_name and count.index. If the server_name is smtp and instance_count is 1 then output should be smtp, or if instance_count is 2 then it should be smtp1 & smtp2

tags{
Name = var.instance_count !=1 ? "var.server_name-${count.index + 1}" : var.server_name
}

Output (for instance_count = 1):

Name = -

Please help.

Answer 1

我看到的唯一问题是它应该是（缺少${var.server_name} ）：

var.instance_count !=1 ? "${var.server_name}-${count.index + 1}" : var.server_name