Question

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 - 差异是一个额外执行的脚本

  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)}"
    }
  }

除了此脚本差异外，模块具有完全相同的步骤。重复的terraform代码量大约为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

可变

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)}"
  }
}

感知使用共同步骤

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}",
  ]
}

当我运行时，我得到了

错误：模块＆＃39;实例＆＃39;：未知变量引用：＆＃39; setup_files_destination＆＃39 ;;用变量定义它＆＃39;块

因此setup_files_destination是模块内定义的变量，但不是使用模块的.tf文件中定义的变量。它具有默认值，实际上是远程实例上shell脚本目录的位置。

我想将setup_files_destination保留在模块中。所以我寻找的是一种推迟变量插值的方法，直到实际使用模块为止。 这可能是terraform吗？

Answer 1

无法按照您尝试的方式推迟插值，您可以使用null_resource和计数来实现您要尝试的操作。这只会在模块初始化

中定义变量run_additional_setup = true时运行脚本

实施例

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}",
    ]
  }
}

如何减少模块中的样板供应？

1 个答案:

实施例