Terraform 将 2 个变量组合成一个新变量 [英] Terraform combine 2 variables into a new variable

问题描述

我想在具有大量端口组的环境中自动部署 Vmware 虚拟机.为了能够选择正确的端口组，最好输入 2 个变量租户和环境.这 2 个变量用于 CMDB 注册和部署目的.

I want to automate deployments of Vmware VM's in an landscape with lots of portgroups. To be able to select the correct portgroup it would be best to enter 2 variables tenant and environment. These 2 variables are used for CMDB registration and deployment purposes.

对于部署，需要将变量合并为 1 个新变量以选择正确的端口组.由于插值语法，似乎不可能在查找中使用 2 个组合变量.

For the deployment the variables need to be combined in to 1 new variable to pick the correct portgroup. Due to interpolation syntax it seems to be impossible to use 2 combined variables in the lookup.

如何在 Terraform 中将 2 个变量合并为 1?

How can I combine 2 variables to 1 in Terraform?

我也尝试使用正确的字符串制作本地文件，但该文件需要在脚本启动之前存在，terraform plan 给出了该文件不存在的错误消息.

I also tried to make a local file with the correct string, but that file needs to exist before the script starts, terraform plan gives a error message that the file doesn't exist.

variable "tenant" {
  description = "tenant: T1 or T2"
}

variable "environment" {
  description = "environment: PROD or TEST"
}

variable "vm_network" {
  description = "network the VM will be provisioned with"
  type = "map"
  default = {
    T1_PROD = "T1-PROD-network"
    T2_PROD = "T2-PROD-network"
    T1_TEST = "T1-TEST-network"
    T2_TEST = "T2-TEST-network"
  }
}

data "vsphere_network" "network" {
  name          = "${lookup(var.vm_network, tenant_environment)}"
  datacenter_id = "${data.vsphere_datacenter.dc.id}"
}

推荐答案

在我的脑海里，我可以想到三种不同的方法来合并变量以用作查找键:

Off the top of my head I can think of three different ways to merge the variables to use as a lookup key:

variable "tenant" {}
variable "environment" {}

variable "vm_network" {
  default = {
    T1_PROD = "T1-PROD-network"
    T2_PROD = "T2-PROD-network"
    T1_TEST = "T1-TEST-network"
    T2_TEST = "T2-TEST-network"
  }
}

locals {
  tenant_environment = "${var.tenant}_${var.environment}"
}

output "local_network" {
  value = "${lookup(var.vm_network, local.tenant_environment)}"
}

output "format_network" {
  value = "${lookup(var.vm_network, format("%s_%s", var.tenant, var.environment))}"
}

output "lookup_network" {
  value = "${lookup(var.vm_network, "${var.tenant}_${var.environment}")}"
}

第一个选项使用 locals 创建一个已经插入的变量，并且可以很容易地在多个地方重用，而这些地方不能直接用 Terraform/HCL 中的变量来完成.这通常是在更高版本的 Terraform 中进行变量组合/插值的最佳方式(它们是在 Terraform 0.10.3 中引入的).

The first option uses locals to create a variable that is interpolated already and can be easily reused in multiple places which can't be done directly with variables in Terraform/HCL. This is generally the best way to do variable combination/interpolation in later versions of Terraform (they were introduced in Terraform 0.10.3).

第二个选项使用格式 函数 创建一个包含租户和环境变量的字符串.

The second option uses the format function to create a string containing the tenant and environment variables.

最后一个看起来有点滑稽，但它是有效的 HCL.如果可能，我可能会回避使用该语法.

The last one is a little funny looking but is valid HCL. I'd probably shy away from using that syntax if possible.

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