[英]Terraform For_Each: How to reference created resource ID
我创建了一个创建 AWS 子网的模块。 在模块中,我使用 for_each 循环来创建子网。 我假设我可以索引给定子网的资源 ID,但似乎循环没有 output 以可预测的顺序索引子网 ID ...不知道我在这里遗漏了什么。 任何帮助表示赞赏!
主文件
module "subnets" {
source = "./modules/subnets/"
vpc_id = aws_vpc.main.id
subnets = [
{
name = "private-1a"
cidr_block = "10.0.0.0/28"
availability_zone = "us-east-1a"
},
{
name = "private-1b"
cidr_block = "10.0.1.0/24"
availability_zone = "us-east-1b"
},
{
name = "public-1a"
cidr_block = "10.0.2.0/24"
availability_zone = "us-east-1a"
},
{
name = "public-1b"
cidr_block = "10.0.3.0/24"
availability_zone = "us-east-1b"
}
]
}
output "private1a" {
value = module.security_subnets.subnet_id[0]
}
output "private1b" {
value = module.security_subnets.subnet_id[1]
}
output "public1a" {
value = module.security_subnets.subnet_id[2]
}
output "public1b" {
value = module.security_subnets.subnet_id[3]
}
模块
locals {
subnets = {
for i in var.subnets :
i.name => i
}
}
resource "aws_subnet" "main" {
for_each = local.subnets
vpc_id = var.vpc_id
cidr_block = each.value.cidr_block
availability_zone = each.value.availability_zone
tags = merge(
{
"Name" = format("%s", each.value.name)
}
)
}
output subnet_id {
value = values(aws_subnet.main)[*].id
}
作为一般规则,依赖于返回项目的顺序不是一个好习惯,因为如果您决定在两者之间添加某些内容或删除某些内容,这可能会导致未来的问题。
不过,在您的情况下,物品返回的顺序是明确定义的。 由于您使用的是值,因此顺序为:
这些值由其对应的键按字典顺序返回,因此这些值的返回顺序与它们的键从键返回的顺序相同。
使用 map 结构而不是subnets
变量的数组应按索引返回值,然后解决如果顺序更改时混合值的问题(如删除项目):
module "subnets" {
source = "./modules/subnets/"
vpc_id = aws_vpc.main.id
subnets = {
"private-1a" = {
name = "private-1a"
cidr_block = "10.0.0.0/28"
availability_zone = "us-east-1a"
},
"private-1b" = {
name = "private-1b"
cidr_block = "10.0.1.0/24"
availability_zone = "us-east-1b"
},
"public-1a" = {
name = "public-1a"
cidr_block = "10.0.2.0/24"
availability_zone = "us-east-1a"
},
"public-1b" = {
name = "public-1b"
cidr_block = "10.0.3.0/24"
availability_zone = "us-east-1b"
}
}
}
output "private1a" {
value = module.security_subnets.subnet_id["private-1a"]
}
// and so on
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