未加载“.tfvars”中的值

Question

我是 Terraform 的新手，正在构建我的第一个 Terraform 脚本以在 GCP 中启动实例。来自的值terraform.tfvars是不是正在加载，并且仅variables.tf加载默认值。以下是我用来运行脚本的命令。有人可以告诉我我犯的错误吗？

terraform plan -var-file=terraform.tfvars
terraform apply-var-file=terraform.tfvars 

以下是文件结构

├── gcp_instance
│   ├── gcp_instance.tf
│   └── variables.tf
├── main.tf
└── terraform.tfvars

我的main.tf文件

module gcpinstance {
  source = "./gcp_instance"
} 

我的gcp_instance.tf文件

terraform {
  required_providers {
    google = {
      source = "hashicorp/google"
      version = "3.5.0"
    }
  }
}

provider "google" {
  region      = "${var.gcp_region}"
  project     = "${var.gcp_project}"
  zone        = "${var.gcp_zone}"
  credentials = "${var.gcp_credentials}"
}

resource "google_compute_instance" "vm_instance" {
  count        = length(var.instance_name)
  name         = var.instance_name[count.index]
  machine_type = element(var.instance_type, count.index)

  boot_disk {
    initialize_params {
      image =  element(var.instance_image, count.index)
    }
  }

  network_interface {
    network = "${var.gcp_network}"
  }
}

我的variables.tf文件

variable "gcp_project" {
  description = "Google Cloud Platform project"
  default     = "test"
}

variable "gcp_region" {
  description = "Google Cloud Platform's selected region"
  default     = "us-central1"
}

variable "gcp_zone" {
  description = "Google Cloud Platform's selected Zone"
  default     = "us-central1-f"
}

variable "gcp_credentials" {
  description = "Credential file to be used for this project"
  default     = "test"
}

variable "instance_tags" {
  type = list
  default = ["application1", "application2"]
}

variable "instance_type" {
  type = list
  default = ["f1-micro","f1-micro"]
}

variable "instance_name" {
  type = list(string)
  default = ["application1", "application2"]
}

variable "instance_image" {
  type = list
  default = ["debian-cloud/debian-9","debian-cloud/debian-9"]
}

variable "gcp_network" {
  description = "Network to be used"
  default     = "default"
}

variable "gcp_network_global_cidr" {
  description = "CIDR for the Instances"
  default     = "10.0.0.0/24"
}

我的 terraform.tfvars文件

gcp_project = "test"
gcp_region  = "us-central1"
gcp_zone    = "us-central1-f"

gcp_credentials = "test.json"
instance_tags = ["application1", "application2", "application3"]
instance_type = ["f1-micro", "f1-micro", "f1-micro"]
instance_name = ["application1", "application2", "application3"]
instance_image = ["debian-cloud/debian-9", "debian-cloud/debian-9", "debian-cloud/debian-9"]

gcp_network = "default"
gcp_network_global_cidr = "10.0.0.0/24"