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複数のawsインスタンス、複数のサブネットをterraform

terraform -v
Terraform v0.12.23
+ provider.aws v2.53.0

4つのインスタンスを作成して2つの異なるサブネットに配置しようとしています

resource "aws_subnet" "private-subnet-1" {
  vpc_id            = aws_vpc.vpc.id
  cidr_block        = "10.150.2.0/24"
  availability_zone = "us-west-2a"
  tags = {
   Name = "private-subnet-1"
  }
}

resource "aws_subnet" "private-subnet-2" {
  vpc_id            = aws_vpc.vpc.id
  cidr_block        = "10.150.4.0/24"
  availability_zone = "us-west-2b"
  tags = {
   Name = "private-subnet-2"
  }
}

variable "subnet_ids" {
  type    = list(string)
  default = ["aws_subnet.private-subnet-1.id","aws_subnet.private-subnet-2.id"]
}

resource "aws_instance" "web" {
  count = 4
  AMI           = "AMI-0dc33a373d61e6ce0"
  instance_type = "t2.micro"
  key_name   = "AF_KEY_PAIR"
  subnet_id     = element(var.subnet_ids, count.index)
  vpc_security_group_ids = ["${aws_security_group.web-SG.id}"]
}

適用しようとすると、次のエラーが表示されます

Error: Error launching source instance: InvalidSubnetID.NotFound: The subnet ID 'aws_subnet.private-subnet-1.id' does not exist
        status code: 400, request id: 17b46634-5319-4f78-9898-09142e9cb449
  on test.tf line 175, in resource "aws_instance" "web":
 175: resource "aws_instance" "web" {

Error: Error launching source instance: InvalidSubnetID.NotFound: The subnet ID 'aws_subnet.private-subnet-2.id' does not exist
        status code: 400, request id: d092e6a6-d430-4a28-bd75-5af373c76ac7
  on test.tf line 175, in resource "aws_instance" "web":
 175: resource "aws_instance" "web" {

Error: Error launching source instance: InvalidSubnetID.NotFound: The subnet ID 'aws_subnet.private-subnet-1.id' does not exist
        status code: 400, request id: ec672172-3bf7-4cbb-bce0-ae752c59393f
  on test.tf line 175, in resource "aws_instance" "web":
 175: resource "aws_instance" "web" {

Error: Error launching source instance: InvalidSubnetID.NotFound: The subnet ID 'aws_subnet.private-subnet-2.id' does not exist
        status code: 400, request id: 4136f03c-1a5b-44ab-b0bf-a209134c08c9
  on test.tf line 175, in resource "aws_instance" "web":
 175: resource "aws_instance" "web" {

私は変更しようとしました

subnet_id     = element(var.subnet_ids, count.index)

そして

variable "subnet_ids" {
  type    = list(string)
  default = [aws_subnet.AF-private-subnet-1.id,aws_subnet.AF-private-subnet-2.id]
}

それでも同じエラーが発生する

Subnet_idを手動で作成すると機能します

subnet_id     = aws_subnet.public-subnet-1.id
amazon-web-servicesterraform
1
James Connigan

あなたが遭遇している問題は、variable subnet_idsがリストを解釈しています。 IDを変数としてではなく、文字列として解釈しています。

変数にlocalsを使用しましたが、期待どおりに機能しました。

コードに次の変更を加えてみてください。

locals {
  subs = concat([aws_subnet.private-subnet-1.id], [aws_subnet.private-subnet-2.id])
}

resource "aws_instance" "web" {
  count = 4
  AMI           = "AMI-0dc33a373d61e6ce0"
  instance_type = "t2.micro"
  key_name   = "AF_KEY_PAIR"
  subnet_id     = element(local.subs, count.index)
  vpc_security_group_ids = ["${aws_security_group.web-SG.id}"]
}

参照

ローカル値
式

1
kenlukas