如何打印 terraform 变量值？

Question

我正在学习地形。我想在“计划”阶段打印变量的值。所以我找到了该怎么做。似乎我在这里做错了什么......

在变量.tf中：....

variable "VMCount" {
    description = "How many VMs do you want to start with (number)? default=1 max=5"
    type = number
}

在 main.tf 中

output "VMCount" {
  value = "${var.VMCount > 2 && var.VMCount < 6 ? var.VMCount : 2}"
}

之后我运行 terraform plan 并且条件似乎工作正常（它创建了正确数量的虚拟机）

但变量输出还没有到来。为什么？

$ terraform output
VMC = 56

VMC 可能来自之前的一些尝试（我尝试了几件事）。

如何打印用户输入的值（变量）？

谢谢。

Answer 1

我用这个测试过：

variable "VMCount" {
    description = "How many VMs do you want to start with (number)? default=1 max=5"
    type = number
}

output "VMCount" {
  value = "${var.VMCount > 2 && var.VMCount < 6 ? var.VMCount : 2}"
}

而且效果很好。

Terraform will perform the following actions:

Plan: 0 to add, 0 to change, 0 to destroy.

Changes to Outputs:
  + VMCount = 4

Do you want to perform these actions?
  Terraform will perform the actions described above.
  Only 'yes' will be accepted to approve.

  Enter a value: yes


Apply complete! Resources: 0 added, 0 changed, 0 destroyed.

Outputs:

VMCount = 4
PS C:\d\m\terraform\output-and-variable> terraform output
VMCount = 4
PS C:\d\m\terraform\output-and-variable> terraform apply
var.VMCount
  How many VMs do you want to start with (number)? default=1 max=5

  Enter a value: 8


Terraform used the selected providers to generate the following execution plan. Resource actions are indicated with the following symbols:

Terraform will perform the following actions:

Plan: 0 to add, 0 to change, 0 to destroy.

Changes to Outputs:
  ~ VMCount = 4 -> 2

Do you want to perform these actions?
  Terraform will perform the actions described above.
  Only 'yes' will be accepted to approve.

  Enter a value: yes


Apply complete! Resources: 0 added, 0 changed, 0 destroyed.

Outputs:

VMCount = 2
PS C:\d\m\terraform\output-and-variable> terraform output
VMCount = 2
PS C:\d\m\terraform\output-and-variable>

你能检查一下你所在州有哪些出局吗？VMC 还是 VMCount？

Answer 2

正如terraform 文档中所述：

仅当 Terraform 应用您的计划时才会渲染输出。运行 terraform plan 将不会渲染输出。