如何根据 Terraform-AWS 中的变量 enable/disable 磁盘？

Question

我想创建一个 AWS 实例，并根据变量，创建或不创建额外的磁盘。这将允许我保留相同的 .tf 文件，并在我需要磁盘时通过命令行变量指定。

...
variable "create-extra-disk" {
    default=false
}
...
resource "aws_instance" "my_instance" {
    count           = "${var.instance_count}"
    ami             = "${var.image_id}"
    instance_type   = "${var.type}"
    key_name        = "${aws_key_pair.my-keypair.key_name}"
    security_groups = ["${aws_security_group.basic_sg.name}"]

    ebs_block_device {
        # enable = "${var.create-extra-disk}" # I'd like something like this
        device_name = "/dev/sdb"
        volume_size = 100
        volume_type = "gp2"
        delete_on_termination = true
    }
    ...

Answer 1

您需要创建两个资源并使用带变量的计数来包含运行额外磁盘部分的条件，所有这些都将在单个文件中。

...
variable "create-extra-disk" {
default=false
}
...
resource "aws_instance" "my_instance" {
count           = "${var.instance_count && var.create-extra-disk == true ? 1 : 0}"
ami             = "${var.image_id}"
instance_type   = "${var.type}"
key_name        = "${aws_key_pair.my-keypair.key_name}"
security_groups = ["${aws_security_group.basic_sg.name}"]
}

resource "aws_instance" "my_instance_with_ebs" {
count           = "${var.instance_count && var.create-extra-disk == true ? 1 : 0 }"
ami             = "${var.image_id}"
instance_type   = "${var.type}"
key_name        = "${aws_key_pair.my-keypair.key_name}"
security_groups = ["${aws_security_group.basic_sg.name}"]

ebs_block_device {
    device_name = "/dev/sdb"
    volume_size = 100
    volume_type = "gp2"
    delete_on_termination = true
}

Answer 2

您可以为 ec2、ebs 和 ebs 附件使用单独的资源以实现可配置性， https://www.terraform.io/docs/providers/aws/r/ebs_volume.html https://www.terraform.io/docs/providers/aws/r/volume_attachment.html

以上代码似乎是 terraform 0.11 或以下，

variable "create-extra-disk" {
  default = true
} 

resource "aws_instance" "my_instance" {
  count         = "${var.instance_count}"
  ...
}

resource "aws_ebs_volume" "additional" {
  count             = "${var.create-extra-disk == true ? var.instance_count : 0}"
  availability_zone = "${var.region}"
  size              = 100
  type              = "gp2"
}

resource "aws_volume_attachment" "ebs_att" {
  count       = "${var.create-extra-disk == true ? var.instance_count : 0}"
  device_name = "/dev/sdb"
  volume_id   = "${element(aws_ebs_volume.additional.*.id, count.index)}"
  instance_id = "${element(aws_instance.my_instance.*.id, count.index)}"
}

如何根据 Terraform-AWS 中的变量 enable/disable 磁盘？

How to enable/disable disk according to variable in Terraform-AWS?

terraform

terraform-provider-aws