在 Terraform 中多次执行相同的资源

Question

我需要在 Terraform 代码中多次运行 local-exec。

resource "null_resource" "test_1" {
  provisioner "local-exec" {
    command = "python test.py"
  }
  triggers = {
    always_run = "${timestamp()}"
  }
}

resource "null_resource" "test_2" {
  depends_on =[null_resource.test]
  provisioner "local-exec" {
    command = "python run.py"
  }

    triggers = {
    always_run = "${timestamp()}"
  }

}

resource "null_resource" "test_3" {
  depends_on = [null_resource.test_2]
  provisioner "local-exec" {
    command = "python test.py"
  }
  triggers = {
    always_run = "${timestamp()}"
  }
}

正如我们在上面的代码中看到的，test_1 和 test_3 我们调用的是同一个 python 文件。但我需要明确地调用它。有什么方法可以简化吗？就像我们在命令式编码中所做的那样，我们调用 like 函数。

我们都知道这里的问题，我们需要多次编写同一行代码，如果有更改，我需要确保在所有地方都需要更改。

Answer 1

对于 python test.py 的情况，只需使用局部变量：

locals {
    code_to_run = "python test.py"
}

resource "null_resource" "test_1" {
  provisioner "local-exec" {
    command = local.code_to_run
  }
  triggers = {
    always_run = "${timestamp()}"
  }
}

resource "null_resource" "test_2" {
  depends_on =[null_resource.test]
  provisioner "local-exec" {
    command = "python run.py"
  }

    triggers = {
    always_run = "${timestamp()}"
  }

}

resource "null_resource" "test_3" {
  depends_on = [null_resource.test_2]
  provisioner "local-exec" {
    command = local.code_to_run
  }
  triggers = {
    always_run = "${timestamp()}"
  }
}

对于更复杂的代码，请使用templatefile 将代码放入参数化模板：

resource "null_resource" "test_1" {
  provisioner "local-exec" {
    command = templatefile("code_to_run.tmpl", {some_parmeter = "test_1"})
  }
  triggers = {
    always_run = "${timestamp()}"
  }
}

resource "null_resource" "test_2" {
  depends_on =[null_resource.test]
  provisioner "local-exec" {
    command = templatefile("code_to_run.tmpl", {some_parmeter = "test_2"})
  }

    triggers = {
    always_run = "${timestamp()}"
  }

}

resource "null_resource" "test_3" {
  depends_on = [null_resource.test_2]
  provisioner "local-exec" {
    command = templatefile("code_to_run.tmpl", {some_parmeter = "test_3"})
  }
  triggers = {
    always_run = "${timestamp()}"
  }
}