Terraform（AWS）：如何通过其ARN获取负载均衡器的DNS名称？

Question

我创建了一个Terraform脚本，该脚本部署了Lambda函数和目标组，并将其分配给在变量中定义的现有负载均衡器：

variable "load_balancer_arn" {
    default = "arn:aws:elasticloadbalancing:us-east-1:xxxxxxxxxxx:loadbalancer/app/xx-test/xxxxxxxxxxx"
}

是否可以通过输出获取此负载均衡器的DNS名称？

Answer 1

有aws_lb data source for NLB和ALB lb数据资源采用了arn：

data "aws_lb" "test" {
  arn  = "${var.lb_arn}"
}

这将返回以下负载均衡器属性：

Attributes Reference
The following attributes are exported in addition to the arguments listed above:

id - The ARN of the load balancer (matches arn).
arn - The ARN of the load balancer (matches id).
arn_suffix - The ARN suffix for use with CloudWatch Metrics.
dns_name - The DNS name of the load balancer.
zone_id - The canonical hosted zone ID of the load balancer (to be used in a Route 53 Alias record).

这包括dns名称以供使用：

${data.aws_lb.test.dns_name}