使用计数与 terraform 在多个子网中启动 EC2 服务器

Question

我有一个用例，我设置了变量 instance_count = 3，我有 2 个 Private_subnets，这是一个列表 [“subnet-id-A”，“subnet-id-B”]，我希望我的 terraform 代码动态生成本地 map 或可以这样的列表

subnets = {
01 = subnet-id-A
02 = subnet-id-B
03 = subnet-id-A
}
OR
subnets = ["subnet-id-A","subnet-id-B","subnet-id-A"]

如果实例数变为 4，则可能是这样的

subnets = {
01 = subnet-id-A
02 = subnet-id-B
03 = subnet-id-A
04 = subnet-id-B
}
OR
subnets = ["subnet-id-A","subnet-id-B","subnet-id-A","subnet-id-B"]

如果实例数变为 2，则可能是这样的

subnets = {
01 = subnet-id-A
02 = subnet-id-B
}
OR
subnets = ["subnet-id-A","subnet-id-B"]

Answer 1

Subnet_ids 是一个包含所有私有子网的列表。

这是代码

locals {
 formatted_count = [for index in range(var.instance_count) : format("0%s", index + 1)]
 instances_count = toset(local.formatted_count)
}
   module "ec2" {
   for_each                    = local.instances_count
   source                      = "terraform-aws-modules/ec2-instance/aws"
   version                     = "3.2.0"
   name                        = var.name
   ami                         = var.ami
   instance_type               = var.instance_type
   key_name                    = var.key_name
   monitoring                  = var.monitoring
   tags                        = var.tags
   vpc_security_group_ids      = var.vpc_security_group_ids
   subnet_id                   = element(var.subnet_ids,each.value - 1)
   }