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所以我有两个完全相同的 terraform 模块......例外是有一个额外的远程执行步骤

模块 A

  provisioner "remote-exec" {
    inline = [
      "sudo chmod 777 -R ${var.setup_files_destination}",
      "sudo ${var.setup_files_destination}/scripts/setup.sh ${var.setup_files_destination}",
    ]

    connection {
      user        = "ec2-user"
      private_key = "${file(var.private_key_location)}"
    }
  }

模块 B - 不同之处是要执行的一个额外脚本

  provisioner "remote-exec" {
    inline = [
      "sudo chmod 777 -R ${var.setup_files_destination}",
      "sudo ${var.setup_files_destination}/scripts/setup.sh ${var.setup_files_destination}",
    ]

    connection {
      user        = "ec2-user"
      private_key = "${file(var.private_key_location)}"
    }
  }

  provisioner "remote-exec" {
    inline = [
      "sudo chmod 777 -R ${var.setup_files_destination}",
      "${var.setup_files_destination}/scripts/setup_special.sh ${var.setup_files_destination}",
    ]

    connection {
      user        = "ec2-user"
      private_key = "${file(var.private_key_location)}"
    }
  }

除了这个脚本差异之外，模块具有完全相同的步骤。重复的 terraform 代码量约为 50 行。

我想在 Terraform 中做什么

所以在 Terraform 方面，我想指定要作为列表执行的脚本，所以像

多变的

variable "commands_to_execute" {
  type = "list"
}

共同步骤

provisioner "remote-exec" {
  inline = "[${var.commands_to_execute}]"

  connection {
    user        = "ec2-user"
    private_key = "${file(var.private_key_location)}"
  }
}

常见步骤的感知使用

module "instances" {
  ... rest of declaration...
  commands_to_execute = [
    "sudo chmod 777 -R ${var.setup_files_destination}",
    "sudo ${var.setup_files_destination}/scripts/setup.sh ${var.setup_files_destination}",
  ]
}

当我运行这个时，我得到

错误：模块“实例”：引用的未知变量：“setup_files_destination”；用“变量”块定义它

在模块内部定义的变量也是如此setup_files_destination，但不在.tf使用模块的文件中定义。它有一个默认值，实际上是远程实例上 shell 脚本目录的位置。

我想保留setup_files_destination在模块中。所以我正在寻找一种将变量的插值推迟到实际使用模块的方法。这在 terraform 中可能吗？

4

1 回答 1

1

不可能按照您尝试的方式推迟插值，您可能可以使用null_resource和计数来实现您想要做的事情。这只会在您run_additional_setup = true在模块初始化中定义变量时运行脚本

例子：

resource "null_resource" "additional_setup" {
  count      = "${var.run_additional_setup == true ? 1 : 0}"
  depends_on = ["aws_instance.my_instance"]

  connection {
    user        = "ec2-user"
    private_key = "${file(var.private_key_location)}"
  }

  provisioner "remote-exec" {
    inline = [
      "sudo chmod 777 -R ${var.setup_files_destination}",
      "${var.setup_files_destination}/scripts/setup_special.sh ${var.setup_files_destination}",
    ]
  }
}
于 2018-04-06T16:51:43.300 回答