[英]Attach each EIP to each Nat Gatway in Terraform
I'm creating two public subnets that will each contain a nat gateay.我正在创建两个公共子网,每个子网都包含一个 nat gateay。 My code, attempts to create these nats per subnet, and then allocate the eip to each.
我的代码尝试为每个子网创建这些 nat,然后将 eip 分配给每个子网。 However, since my for each starts the code block, it looks like the allocation id became us-east-* instead of the id of the eip.
但是,由于我的 for each 启动了代码块,看起来分配 id 变成了 us-east-* 而不是 eip 的 id。
Variables.tf:变量.tf:
variable "public_subnet_numbers" {
type = map(number)
description = "Map of AZ to a number that should be used for public subnets"
default = {
"us-east-1a" = 1
"us-east-1b" = 2
#"us-east-1c" = 3
}
}
variable "private_subnet_numbers" {
type = map(number)
description = "Map of AZ to a number that should be used for private subnets"
default = {
"us-east-1a" = 4
"us-east-1b" = 5
#"us-east-1c" = 6
}
}
variable "vpc_cidr" {
type = string
description = "The IP range to use for the VPC"
default = "192.168.0.0/16"
}
Main.tf:主文件:
resource "aws_eip" "nat" {
count = 2
vpc = true
lifecycle {
# prevent_destroy = true
}
tags = {
Name = "cf-${var.infra_env}-eip"
Project = "cf.io"
Environment = var.infra_env
VPC = aws_vpc.vpc.id
ManagedBy = "terraform"
Role = "private"
}
}
resource "aws_nat_gateway" "ngw" {
for_each = var.private_subnet_numbers
subnet_id = each.value.id #aws_subnet.public[each.key].id
allocation_id = aws_eip.nat[each.key].id
tags = {
Name = "cf-${var.infra_env}-ngw"
Project = "cf.io"
VPC = aws_vpc.vpc.id
Environment = var.infra_env
ManagedBy = "terraform"
Role = "private"
}
}
Error:错误:
Error: Invalid index
│
│ on ../terraform/modules/networking/gateways.tf line 42, in resource "aws_nat_gateway" "ngw":
│ 42: allocation_id = aws_eip.nat[each.key].id
│ ├────────────────
│ │ aws_eip.nat is tuple with 2 elements
│ │ each.key is "us-east-1a"
│
│ The given key does not identify an element in this collection value: a number is required.
╵
╷
│ Error: Invalid index
│
│ on ../terraform/modules/networking/gateways.tf line 42, in resource "aws_nat_gateway" "ngw":
│ 42: allocation_id = aws_eip.nat[each.key].id
│ ├────────────────
│ │ aws_eip.nat is tuple with 2 elements
│ │ each.key is "us-east-1b"
│
│ The given key does not identify an element in this collection value: a number is required.
You're mixing count
and for_each
.您正在混合
count
和for_each
。 The easiest way to solve this would be to use for_each
in your EIP creation as well, which makes sense because you are creating an EIP for each NAT.解决这个问题的最简单方法是在您的 EIP 创建中也使用
for_each
,这是有道理的,因为您正在为每个 NAT 创建一个 EIP。 That would also make your code work better if you decided to add another subnet later, you wouldn't need to go in and change the count
from 2
to 3
.如果您决定稍后添加另一个子网,这也将使您的代码更好地工作,您无需进入并将
count
从2
更改为3
。
Otherwise, you need to use the index function to convert the each
value to an index number.否则,您需要使用index 函数将
each
值转换为索引号。
As Mark B mentioned mixing the count
and for_each
is not recommended.正如 Mark B 提到的那样,不建议将
count
和for_each
混合使用。 In your current setup using exclusively for_each
is the way to go based on the private_subnet_numbers
variable.在您当前的设置中,仅使用
for_each
是基于private_subnet_numbers
变量的方法。
In your aws_eip.nat
resource change count
to for_each
在您的
aws_eip.nat
资源更改count
为for_each
resource "aws_eip" "nat" {
for_each = var.private_subnet_numbers
vpc = true
}
Next in your resource aws_nat_gateway.ngw
you should refer to subnet ids
using each
接下来在您的资源
aws_nat_gateway.ngw
中,您应该使用each
引用subnet ids
resource "aws_nat_gateway" "ngw" {
for_each = var.private_subnet_numbers
subnet_id = aws_subnet.public[each.key].id
....
}
And the code as a whole for clarity为了清楚起见,整个代码
resource "aws_vpc" "vpc" {
... vpc configurations ...
}
resource "aws_subnet" "public" {
for_each = var.private_subnet_numbers
vpc_id = aws_vpc.vpc.id
... subnet configurations ...
}
resource "aws_eip" "nat" {
for_each = var.private_subnet_numbers
vpc = true
lifecycle {
# prevent_destroy = true
}
tags = {
Name = "cf-${var.infra_env}-eip"
Project = "cf.io"
Environment = var.infra_env
VPC = aws_vpc.vpc.id
ManagedBy = "terraform"
Role = "private"
}
}
resource "aws_nat_gateway" "ngw" {
for_each = var.private_subnet_numbers
subnet_id = aws_subnet.public[each.key].id
allocation_id = aws_eip.nat[each.key].id
tags = {
Name = "cf-${var.infra_env}-ngw"
Project = "cf.io"
VPC = aws_vpc.vpc.id
Environment = var.infra_env
ManagedBy = "terraform"
Role = "private"
}
}
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