amazon-web-services - 地形 (AWS) : How to get DNS name of Load Balancer by its ARN?

Question

我创建了一个部署 Lambda 函数和目标组的 Terraform 脚本，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"
}

有没有办法通过输出获取此负载均衡器的 DNS 名称？

Answer 1

有 aws_lb data source对于采用 arn 的 NLB 和 ALB lb 数据资源:

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，使用它:

${data.aws_lb.test.dns_name}

对于最新的 terraform(此时 tf 0.13)你不使用大括号，所以它变成:

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

data.aws_lb.test.dns_name