Terraform -创建多个EBS卷

Question

如何创建多个EBS卷并将其附加到实例？

下面的代码在附加单个EBS卷时工作。我主要关心的是在EBS卷的大小和设备名称之间创建一个映射。我试过各种各样的东西，创建一个列表等等，但没有运气。

# Create EBS volume
resource "aws_ebs_volume" "ebs_volume" {
  count                 = "${var.ec2_create_volume == true ? var.ec2_instance_count : 0 }"
  availability_zone     = "${aws_instance.ec2.*.availability_zone[count.index]}"
  size                  = "${var.ec2_ebs_volume_size}"
  type                  = "${var.ec2_ebs_volume_type}"
}

# Attach EBS Volume
resource "aws_volume_attachment" "volume_attachment" {
  count                 = "${var.ec2_create_volume == true ? var.ec2_instance_count : 0 }"
  device_name           = "${var.ec2_device_name}"
  volume_id             = "${aws_ebs_volume.ebs_volume.*.id[count.index]}"
  instance_id           = "${aws_instance.ec2.*.id[count.index]}"
}

Answer 1

就快到了，尝试使用element(list, index) -它会循环到列表上。例如，此配置将成功地创建2个ec2实例，每个实例附加3个额外的ebs卷：

variable "ec2_device_names" {
  default = [
    "/dev/sdd",
    "/dev/sde",
    "/dev/sdf",
  ]
}

variable "ec2_instance_count" {
  default = 2
}

variable "ec2_ebs_volume_count" {
  default = 3
}

resource "aws_instance" "ec2" {
  count         = "${var.ec2_instance_count}"
  ami           = "${var.aws_ami_id}"
  instance_type = "${var.ec2_instance_type}"
}

resource "aws_ebs_volume" "ebs_volume" {
  count             = "${var.ec2_instance_count * var.ec2_ebs_volume_count}"
  availability_zone = "${element(aws_instance.ec2.*.availability_zone, count.index)}"
  size              = "${var.ec2_ebs_volume_size}"
}

resource "aws_volume_attachment" "volume_attachement" {
  count       = "${var.ec2_instance_count * var.ec2_ebs_volume_count}"
  volume_id   = "${aws_ebs_volume.ebs_volume.*.id[count.index]}"
  device_name = "${element(var.ec2_device_names, count.index)}"
  instance_id = "${element(aws_instance.ec2.*.id, count.index)}"
}

Answer 2

以防其他人在寻找答案。下面的解决方案适用于跨多个az的多个实例。在这里，additional_volume_size. device_name是字符串列表，因此我们需要传递与附加卷数量相同的名称，而volume_count是数字list的长度。

resource "aws_ebs_volume" "ebs_volume" {
      count             = var.instance_count * var.volume_count
      availability_zone = aws_instance.ec2[floor(count.index/var.volume_count)].availability_zone
      size              = var.additional_volume_size[count.index%var.volume_count]
    }

resource "aws_volume_attachment" "volume_attachement" {
      count       = var.instance_count * var.volume_count
      volume_id   = element(aws_ebs_volume.ebs_volume.*.id, count.index)
      device_name = element(var.device_name, count.index)
      instance_id = element(aws_instance.ec2.*.id, floor(count.index/var.volume_count))
    }

Answer 3

具有不同大小的多个EBS卷的多个EC2实例。这适用于奇数或偶数卷。

instance_count = 3
ebs_volume_count        = 2
ec2_ebs_volume_size     = [10, 15]
ec2_device_names        = ["/dev/sdd", "/dev/sde"]

variable "instance_count" {
  type        = number
  default     = 1
}

variable "ebs_volume_count" {
  type        = number
  default     = 0
}

variable "ec2_ebs_volume_size" {
  type        = list(any)
  default = [
    10
  ]
}

variable "ec2_device_names" {
  type = list(any)
  default = [
    "/dev/sdd"
  ]
}

variable "availability_zones" {
  type        = list(any)
}

variable "subnet_ids" {
  type        = list(any)
}

resource "aws_instance" "ec2_instance" {
  count         = var.instance_count 
  ami           = var.aws_ami_id
  availability_zone       = var.availability_zones[count.index]
  subnet_id               = var.subnet_ids[count.index]
  instance_type = var.ec2_instance_type
}

resource "aws_ebs_volume" "ebs_volume" {
  count             = var.instance_count * var.ebs_volume_count
  availability_zone = "${element(aws_instance.ec2_instance.*.availability_zone, floor (count.index/var.ebs_volume_count))}"
  size              = var.ec2_ebs_volume_size[count.index%var.ebs_volume_count]
}

resource "aws_volume_attachment" "volume_attachement" {
  count       = var.instance_count * var.ebs_volume_count
  volume_id   = aws_ebs_volume.ebs_volume.*.id[count.index]
  device_name = var.ec2_device_names[count.index%var.ebs_volume_count]
  instance_id = "${element(aws_instance.ec2_instance.*.id, floor (count.index/var.ebs_volume_count))}"
}