生成具有两个Terraform列表的笛卡尔乘积

locals {
  instance_types = ["t2.micro", "t2.small"]
  regions       = ["us-east-1", "us-west-2"]
  instances     = flatten([
    for region in local.regions : [
      for instance_type in local.instance_types : {
        type  = instance_type
        region = region
      }
    ]
  ])
}

resource "aws_instance" "example" {
  for_each = { for instance in local.instances : "${instance.region}-${instance.type}" => instance }

  ami           = "ami-0c55b159cbfafe1f0"
  instance_type = each.value.type
  availability_zone = each.value.region
}