地形 EB 环境找不到具有显式依赖项的子网

Question

我有一个 Terraform 配置，在一个文件中包含各种 AWS 资源，包括一个 VPC、三个私有子网、三个公有子网和一个 EB 环境。

我的 Terraform 版本是 0.12.0，而 AWS 提供商版本是~> 2.12专有网络如下所示：

resource "aws_vpc" "terraform-vpc" {
cidr_block                       = "${var.cidr_block}"
assign_generated_ipv6_cidr_block = true
}

我的六个子网如下所示：

resource "aws_subnet" "private-a" {
vpc_id            = "${aws_vpc.terraform-vpc.id}"
availability_zone = "eu-west-2a"
cidr_block        = "10.0.1.0/24"
}
resource "aws_subnet" "public-a" {
vpc_id            = "${aws_vpc.terraform-vpc.id}"
availability_zone = "eu-west-2a"
cidr_block        = "10.0.2.0/24"
}
resource "aws_subnet" "private-b" {
vpc_id            = "${aws_vpc.terraform-vpc.id}"
availability_zone = "eu-west-2b"
cidr_block        = "10.0.3.0/24"
}
resource "aws_subnet" "public-b" {
vpc_id            = "${aws_vpc.terraform-vpc.id}"
availability_zone = "eu-west-2b"
cidr_block        = "10.0.4.0/24"
}
resource "aws_subnet" "private-c" {
vpc_id            = "${aws_vpc.terraform-vpc.id}"
availability_zone = "eu-west-2c"
cidr_block        = "10.0.5.0/24"
}
resource "aws_subnet" "public-c" {
vpc_id            = "${aws_vpc.terraform-vpc.id}"
availability_zone = "eu-west-2c"
cidr_block        = "10.0.6.0/24"
}

然后，在我的aws_elastic_beanstalk_environment资源中，我有：

...
setting {
namespace = "aws:ec2:vpc"
name      = "Subnets"
value     = "#{aws_subnet.private-a.id},#{aws_subnet.private-b.id},#{aws_subnet.private-c.id}"
}
setting {
namespace = "aws:ec2:vpc"
name      = "ELBSubnets"
value     = "#{aws_subnet.public-a.id},#{aws_subnet.public-b.id},#{aws_subnet.public-c.id}"
}
...
depends_on = [
aws_security_group.default, # created earlier in the same file
aws_subnet.public-a,
aws_subnet.public-b,
aws_subnet.public-c,
aws_subnet.private-a,
aws_subnet.private-b,
aws_subnet.private-c
]

问题是我总是收到一个错误，指出其中一个子网不存在，例如：

Error: ConfigurationValidationException: Configuration validation exception: 
Invalid option value: '["#{aws_subnet.private-c.id}","#{aws_subnet.private-b.id}","#{aws_subnet.private-a.id}"]' 
(Namespace: 'aws:ec2:vpc', OptionName: 'Subnets'): The subnet '#{aws_subnet.private-c.id}' does not exist.

它始终与不同的子网相关，有时是用于Subnets选项的私有子网之一，有时是ELBSubnets选项中使用的公共子网之一。

令我困惑的是，我已经明确将它们定义为依赖项，尽管我认为即使没有明确的依赖项，它也应该可以工作。在terraform apply日志中，所有子网始终在 eb 环境之前创建：

aws_subnet.private-c: Creation complete after 1s [id=subnet-some-id]
aws_subnet.public-a: Creation complete after 1s [id=subnet-some-id]
aws_subnet.public-c: Creation complete after 1s [id=subnet-some-id]
aws_subnet.public-b: Creation complete after 1s [id=subnet-some-id]
aws_subnet.private-a: Creation complete after 6s [id=subnet-some-id]
aws_subnet.private-b: Creation complete after 6s [id=subnet-some-id]
...
aws_elastic_beanstalk_environment.default: Creating...

签入 AWS 后，将按预期和apply报告创建子网的所有内容。此错误的原因可能是什么？

Answer 1

正如ydaetskcor在子网插值中提到的，并使用#而不是$，所以#{aws_subnet.public-a.id},#{aws_subnet.public-b.id}应该是${aws_subnet.public-a.id},${aws_subnet.public-b.id}。