在模块内的模块之间传递Terraform变量?

时间:2020-01-30 22:16:14

标签: terraform kubespray

我遇到了一个问题,无法在Kubespray项目中构建模块。

我具有以下文件夹结构:

terraform/
modules/
   kubespray/
      modules/
         compute/
         ips/
         network/
      main.tf
      variables.tf
roles/
    kubespray/
        terraform_setup/
             main.tf

kubespray/main.tf模块中,传递了一些变量:

module "ips" {
  source = "./modules/ips"

  number_of_k8s_masters         = "${var.number_of_k8s_masters}"
  number_of_k8s_masters_no_etcd = "${var.number_of_k8s_masters_no_etcd}"
  number_of_k8s_nodes           = "${var.number_of_k8s_nodes}"
  floatingip_pool               = "${var.floatingip_pool}"
  number_of_bastions            = "${var.number_of_bastions}"
  external_net                  = "${var.external_net}"
  network_name                  = "${var.network_name}"
  router_id                     = "${module.network.router_id}"
}

module "compute" {
  source = "./modules/compute"
  ...
  k8s_master_fips                              = "${module.ips.k8s_master_fips}"
  k8s_master_no_etcd_fips                      = "${module.ips.k8s_master_no_etcd_fips}"
  k8s_node_fips                                = "${module.ips.k8s_node_fips}"
  bastion_fips                                 = "${module.ips.bastion_fips}"
  ...
}
output "private_subnet_id" {
  value = "${module.network.subnet_id}"
}

output "floating_network_id" {
  value = "${var.external_net}"
}

output "router_id" {
  value = "${module.network.router_id}"
}

output "k8s_master_fips" {
  value = "${concat(module.ips.k8s_master_fips, module.ips.k8s_master_no_etcd_fips)}"
}

output "k8s_node_fips" {
  value = "${module.ips.k8s_node_fips}"
}

output "bastion_fips" {
  value = "${module.ips.bastion_fips}"
}

如果我从modules/kubespray/的子模块内部运行terraform init / apply,则效果很好

如果我从role/kubespray出发,

module "kubespray" {
  source    = "../../../modules/kubespray"
  providers = {
    openstack.src = openstack
  }
}

失败并

错误:索引无效

在../../../modules/kubespray/modules/compute/main.tf第670行上的

资源“ openstack_compute_floatingip_associate_v2”“ k8s_node”:670: float_ip =“ $ {var.k8s_node_fips [count.index]}” | ---------------- | count.index为0 | var.k8s_node_fips是动态的空列表

非常感谢您

2 个答案:

答案 0 :(得分:2)

运行terraform时,该目录将成为隐式的“根模块”。如Input Variables文档中所述,根模块可以从CLI或环境访问TF输入,但是所有其他被调用的模块都需要传递这些输入。

我假设正在发生的情况可能是您的~kubespray/variables.tf输入变量已分配了生效的默认值。如果是这种情况,则应将它们复制到~terraform_setup/variables.tf并传递到调用模块中:

module "kubespray" {
  source    = "../../../modules/kubespray"
  providers = {
    openstack.src = openstack
  }
}

答案 1 :(得分:0)

在不要求进一步信息的情况下,我的猜测是,您传入了一个空数组(${var.k8s_node_fips[count.index]},其中var.node_root_volume_size_in_gbvar.number_of_k8s_nodes_no_floating_ip的值大于0,从而导致尝试为资源声明所需的字符串的空数组建立索引时发生错误。

Error: Invalid index

on ../../../modules/kubespray/modules/compute/main.tf line 670, in resource "openstack_compute_floatingip_associate_v2" "k8s_node": 670: floating_ip = "${var.k8s_node_fips[count.index]}" |---------------- | count.index is 0 | var.k8s_node_fips is empty list of dynamic

根据该错误,看来这可能是${var.k8s_node_fips[count.index]}处的插值错误。 似乎正在发生的事情是该变量为空,但是count设置为非零数字,从而导致TF出错。

看看原始项目代码,似乎count变量取决于var.node_root_volume_size_in_gb为0才能设置为0;否则将计数设置为var.number_of_k8s_nodes_no_floating_ip的值。

该错误似乎发生在以下位置的摘要:

resource "openstack_compute_instance_v2" "k8s_node_no_floating_ip_custom_volume_size" {
  name              = "${var.cluster_name}-k8s-node-nf-${count.index+1}"
  count             = "${var.node_root_volume_size_in_gb > 0 ? var.number_of_k8s_nodes_no_floating_ip : 0}"
  availability_zone = "${element(var.az_list, count.index)}"
  image_name        = "${var.image}"
  flavor_id         = "${var.flavor_k8s_node}"
  key_pair          = "${openstack_compute_keypair_v2.k8s.name}"

  block_device {
    uuid                  = "${data.openstack_images_image_v2.vm_image.id}"
    source_type           = "image"
    volume_size           = "${var.node_root_volume_size_in_gb}"
    boot_index            = 0
    destination_type      = "volume"
    delete_on_termination = true
  }

希望这会有所帮助