Question

在Terraform中有一些关于计数的问题，想知道是否有人可以提供建议。我有一组三个实例，在我的一个模块中安装了EBS卷。请参阅以下代码摘录：

  resource "aws_instance" "xxxx" {
  count = "${length(data.aws_availability_zones.all.names)}"

  ami                    = "${var.ami}"
  instance_type          = "t2.small"
  vpc_security_group_ids = ["${module.xxxx-sg.this_security_group_id}"]
  key_name               = "${var.key_name}"
  subnet_id              = "${element(module.vpc.xxxx_subnets, count.index)}"
  user_data              = "${module.xxxx-userdata.template_file}"

  tags {
    Name              = "${local.xxxx_name}"
  }

  root_block_device = [
    {
      volume_size           = 20
      volume_type           = "gp2"
      delete_on_termination = true
    },
  ]
}

这与以下代码配对以创建和附加EBS卷：

resource "aws_ebs_volume" "xxxx-ebs" {
  count = "${length(data.aws_availability_zones.all.names)}"

  availability_zone = "${element(data.aws_availability_zones.all.names, count.index)}"
  size              = 100
  type              = "gp2"

  tags {
    Name = "${local.xxxx_name}"
  }
}

resource "aws_volume_attachment" "xxxx-ebs-attachment" {
  count = "${length(data.aws_availability_zones.all.names)}"
  device_name = "/dev/sdg"
  volume_id   = "${aws_ebs_volume.xxxx-ebs.*.id[count.index]}"
  instance_id = "${aws_instance.xxxx.*.id[count.index]}"
}

所以上面使用的语法（aws_ebs_volume.xxxx-ebs。*。id [count.index]）最初使用的是Terraform中的element（）函数，但我遇到了一个实例，当一个实例被终止/编辑时。 .Terraform会尝试将所有EBS重新附加到所有实例，而不仅仅是已更改的实例。我修改了，目前正在使用上面的语法，它在过去几周一直运行正常，直到今天早上Terraform运行时抛出了以下问题。

为了给你一个状态的当前视图，两个xxxx实例已被终止，所以我希望它重新创建这两个实例并重新附加现有的EBS卷。错误

* module.prod-env0.aws_volume_attachment.xxxx-ebs-attachment: 2 error(s) occurred:

* module.prod-env0.aws_volume_attachment.xxxx-ebs-attachment[1]: index 1 out of range for list aws_instance.xxxx.*.id (max 1) in:
   ${aws_instance.xxxx.*.id[count.index]}

* module.prod-env0.aws_volume_attachment.xxxx-ebs-attachment[2]: index 2 out of range for list aws_instance.xxxx.*.id (max 1) in:
   ${aws_instance.xxxx.*.id[count.index]}

我有兴趣了解其他人如何管理他们的EBS卷。

Answer 1

你的语法错了。你应该做

resource "aws_volume_attachment" "xxxx-ebs-attachment" {
  count = "${length(data.aws_availability_zones.all.names)}"
  device_name = "/dev/sdg"
  volume_id   = "${element(aws_ebs_volume.xxxx-ebs.*.id, count.index)}"
  instance_id = "${element(aws_instance.xxxx.*.id, count.index)}"
}

Terraform ec2实例+ EBS问题

1 个答案: