如何使用 terraform 将 CNAME 指向主机名

Question

我正在使用 terraform 添加 CNAME 记录，我想将它指向我在 linode 上使用 terraform 创建的主机名。

这是我的main.tf

terraform {
  required_providers {
    linode = {
      source = "linode/linode"
      version = "1.16.0"
    }
  }
}

provider "linode" {
    token = "some_secret_token"
}

resource "linode_instance" "example_instance" {
    label = "example_instance_ubuntu-eu-west"
    image = "linode/ubuntu20.04"
    region = "eu-west"
    type = "g6-nanode-1"
    root_pass = "testing@linode"
}

resource "linode_domain" "example_domain" {
  domain   = "example.mydomain.com"
  soa_email= "my@email.com"
  type     = "master"
}

resource "linode_domain_record" "example_domain_record" {
  domain_id  =  linode_domain.example_domain.id
  name       = "example.mydomain.com"
  record_type= "CNAME"
  target     = linode_instance.example_instance.label
  ttl_sec    = 300
}

terrafomr plan 结果

linode_domain.example_domain: 刷新状态... [id=1753447] linode_instance.example_instance：正在刷新状态...[id=33094611]

Terraform 使用选定的提供程序生成以下执行计划。资源操作用以下符号表示：

创建

Terraform 将执行以下操作：

  # linode_domain_record.example_domain_record will be created
  + resource "linode_domain_record" "example_domain_record" {
      + domain_id   = 1753447
      + id          = (known after apply)
      + name        = "example.mydomain.com"
      + record_type = "CNAME"
      + target      = "example_instance_ubuntu-eu-west"
      + ttl_sec     = 300
    }

Plan: 1 to add, 0 to change, 0 to destroy.

但是 terraform apply 错误：

linode_domain_record.example_domain_record: Creating...
╷
│ Error: Error creating a Linode DomainRecord: [400] [target] You have entered an invalid target. It must be a valid hostname.; [name] Invalid hostname 
│ 
│   with linode_domain_record.example_domain_record,
│   on main.tf line 28, in resource "linode_domain_record" "example_domain_record":
│   28: resource "linode_domain_record" "example_domain_record" {
│ 
╵

但是 example_instance_ubuntu-eu-west 确实存在于我的 linodes

Answer 1

根据@mark-b 的评论，您可能需要考虑使用 A(address) 记录类型而不是 CNAME 来引用 linode。

只要 Linode 有可访问的 public IPv4 地址（将下面的 ADDR 替换为 linode 的 public IP），您可以：

resource "linode_domain_record" "example_domain_record" {
  domain_id  =  linode_domain.example_domain.id
  name       = "example.mydomain.com"
  record_type= "A"
  target     = ADDR
  ttl_sec    = 300
}

参见：linode_domain_record and specifically the documentation for record_type

It's unlikely but if the instance has an IPv6 address then you'll want to use AAAA

如何使用 terraform 将 CNAME 指向主机名

How to point CNAME to a hostname using terraform

dns

cname

linode

terraform