terraformでEC2を作ると同時にprivate_ipをRoute53 Internal DNSで俺の考えた最強にイケてるしやばい名前をつける方法

俺です。

EC2のPrivate IPに自分で考えた名前をつける乙なことをしてみたい時のメモです。
countとelementを使うことでterraformでLaunchするEC2の台数が変動してもいい感じにDNS登録されます

以下例

前提: VPC DNS hostnameは有効にすること

EC2

• variables

variable "unko" {
  default = {
    name = "unko"
    ami = "ami-XXXXXXXX"
    instance_type = "c4.2xlarge"
    iam_instance_profile = "unko"
    source_dest_check = true
    ebs_optimized = true
    root_block_device = "gp2"
    root_block_device_size = 100
    count = 2
  }
}

• ec2.tf

resource "aws_instance" "unko" {
..省略..
  count = "${lookup(var.unko, "count")}"
}

Route53

resource "aws_route53_zone" "unko" {
  name = "unko"
  vpc_id = "${aws_vpc.unko.id}"
  vpc_region = "ap-northeast-1"
  tags {
    Type = "Internal DNS"
  }
}

resource "aws_route53_record" "unko" {
  zone_id = "${aws_route53_zone.unko.zone_id}"
  name = "unko-${count.index + 1}-${element(aws_instance.unko.*.availability_zone, count.index)}"
  type = "A"
  ttl = "5"
  count = "${lookup(var.unko, "count")}"
  records = [
    "${element(aws_instance.unko.*.private_ip, count.index)}"
  ]
}

$ terraform apply

これでOK

完