Terraform - ELB 尝试重新创建而不是更新

Question

更新：terraform destroy 没有删除 ELB，但 apply 命令尝试重新创建。即使没有对 ELB 模块进行任何更改，只要运行命令 terraform apply 就会尝试重新创建 ELB。

这是什么原因？

这是我得到的错误：

Error: Error creating ELB: DuplicateLoadBalancerName: Load Balancer named myELB already exists and it is configured with different parameters. status code: 400, request id: 123456789-67b1-4fbd-95e3-17f693cdcf75

这里是 ELB 代码：

# Create ELB
resource "aws_elb" "myELB" {
   depends_on = [
      aws_instance.webservers,
    ]
  for_each = toset(var.public_subnets_names)

  name = "myELB"
  subnets = [data.aws_subnet.public_subnet_ids[each.value].id]

  listener {
    instance_port = 80
    instance_protocol = "http"
    lb_port = 80
    lb_protocol = "http"
  }

  health_check {
    healthy_threshold = 2
    unhealthy_threshold = 2
    timeout = 3
    target = "HTTP:8080/"
    interval = 30
  }

  instances = data.aws_instances.webservers.ids
  cross_zone_load_balancing = true
  idle_timeout = 400
  connection_draining = true
  connection_draining_timeout = 400

  tags = {
    Name = "myELB"
  }

}

这是数据源的样子：

# Get Public Subnets ID's
data "aws_subnet" "public_subnet_ids" {
  depends_on = [
    aws_subnet.subnets,
  ]

  for_each = toset(var.public_subnets_names)

  filter {
    name = "tag:Name"
    values = [each.value]
  }
}

Answer 1

发生这种情况是因为您正在创建多个 ALB，每个子网中都有一个同名 myALB。这是由于以下行：

for_each = toset(var.public_subnets_names)

不确定这是您的意图还是错误，因此不清楚您想要实现什么。

更新：

你通常只使用subnets:

subnets = data.aws_subnet_ids.subnets.ids

您将在哪里使用aws_subnet_ids 来获取子网的 ID。