基于条件的terraform动态输入参数值

Question

我有这个main.tf文件：

resource "google_compute_instance" "prod" {
  count = var.is_test == false ? 1 : 0 #condition : if the is_test = false , create 1 instance of vm
  name         = "vm-prod"
  machine_type = "e2-medium"
  zone         = "us-central1-c"
  boot_disk {
    initialize_params {
      image = "debian-cloud/debian-9"
    }
  }
    network_interface {
        network = "default"
    access_config {
    }
  }
}

resource "google_compute_instance" "dev" {
  count = var.is_test == true ? 3 : 0 #condition : if the is_test = true, create 3 instance of vm
  name         = "vm-dev"
  machine_type = "e2-small"
  zone         = "us-central1-b"
  boot_disk {
    initialize_params {
      image = "debian-cloud/debian-9"
    }
  }
   network_interface {
        network = "default"
    access_config {
    }
  }
}

和variables.tf文件：

variable "is_test" {
  type = bool
  description = "env"
  default = true
}

我使用is_test变量来选择环境，以私有虚拟机

现在，我想从main.tf中删除输入参数的值，并在terraform.tfvars中使用它们。

我怎么能做到这一点？如何根据条件动态地设置输入参数的值？

我的意思是:如果env是dev，vm的大小很小，区域在us-central1 1-b.

如果env为prod，则vm的大小为medium，...谢谢

Answer 1

我会这样做，这样你就不必重复代码和tfvars文件：

resource "google_compute_instance" "instance" {
  name         = var.is_test == false ? "vm-prod" : "vm-dev"
  machine_type = var.is_test == false ? "e2-medium" : "e2-small"
  zone         = var.is_test == false ? "us-central1-c" : "us-central1-b"
  boot_disk {
    initialize_params {
      image = "debian-cloud/debian-9"
    }
  }
    network_interface {
        network = "default"
    access_config {
    }
  }
}

Answer 2

main.tf

resource "google_compute_instance" "my_instance" {
  count = var.instances
  name         = var.name
  machine_type = var.machine_type
  zone         = var.zone
  boot_disk {
    initialize_params {
      image = "debian-cloud/debian-9"
    }
  }
    network_interface {
        network = "default"
    access_config {
    }
  }
}

dev.tfvars

instances = 1
name = "vm-dev"
machine_type="e2-small"
zone="us-central1-b"

prod.tfvars

instances = 3
name = "vm-prod"
machine_type="e2-medium"
zone="us-central1-c"

运行命令

terraform apply -var-file="dev.tfvars"
terraform apply -var-file="prod.tfvars"

文档：Terraform Input Variables