amazon-web-services - Terraform AWS : Couldn't reuse previously created root_block_device with AWS EC2 instance launched with aws_launch_configuration

Question

我已经使用terraform将ELK堆栈部署到了AWS ECS。几周来，所有程序都运行良好，但是2天前，我不得不重新启动实例。
令人遗憾的是，新实例不依赖现有卷来安装根块设备。因此，我的所有Elasticsearch数据都不再对我的Kibana实例可用。
上一卷中的数据仍在此处，当前未使用。
因此，我尝试了很多事情来使该卷挂载在“dev/xvda”上，但没有一个示例:

使用ebs_block_device代替使用

的root_block_device

当实例已经在运行时，交换“dev/xvda”

我正在将aws_autoscaling_group与aws_launch_configuration一起使用。

resource "aws_launch_configuration" "XXX" {
  name = "XXX"
  image_id = data.aws_ami.latest_ecs.id
  instance_type = var.INSTANCE_TYPE
  security_groups = [var.SECURITY_GROUP_ID]
  associate_public_ip_address = true
  iam_instance_profile = "XXXXXX"

  spot_price = "0.04" 
  lifecycle {
    create_before_destroy = true

  }

  user_data = templatefile("${path.module}/ecs_agent_conf_options.tmpl",
    {
      cluster_name = aws_ecs_cluster.XXX.name
    }
  )

//The volume i want to reuse was created with this configuration. I though it would
//be enough to reuse the same volume. It doesn't.
  root_block_device {
    delete_on_termination = false
    volume_size = 50
    volume_type = "gp2"
  }
} 

resource "aws_autoscaling_group" "YYY" {
  name = "YYY"
  min_size = var.MIN_INSTANCES
  max_size = var.MAX_INSTANCES
  desired_capacity = var.DESIRED_CAPACITY
  health_check_type = "EC2"
  availability_zones = ["eu-west-3b"]
  launch_configuration = aws_launch_configuration.XXX.name

  vpc_zone_identifier = [
    var.SUBNET_1_ID,
    var.SUBNET_2_ID]

}

我是否会错过一些显而易见的事情？

Answer 1

遗憾的是，您无法将卷作为根卷附加到实例。
您要做的是根据您的音量创建一个自定义AMI 。这涉及创建卷的快照，然后构造AMI:

Creating a Linux AMI from a snapshot

在terraform中，有专门用于此目的的 aws_ami。
以下terraform脚本以 的三个步骤举例说明了该过程:

创建给定卷的快照

从快照

创建 AMI

从AMI

创建 实例

provider "aws" {
   # your data
}


resource "aws_ebs_snapshot" "snapshot" {
  volume_id = "vol-0ff4363a40eb3357c" # <-- your EBS volume ID
}


resource "aws_ami" "my" {
  name                = "my-custom-ami"

  virtualization_type = "hvm"
  root_device_name    = "/dev/xvda"

  ebs_block_device {
    device_name = "/dev/xvda"
    snapshot_id = aws_ebs_snapshot.snapshot.id
    volume_type = "gp2"
  }
}

resource "aws_instance" "web" {

  ami           = aws_ami.my.id  

  instance_type = "t2.micro"
  # key_name = "<your-key-name>"

  tags = {
    Name = "InstanceFromCustomAMI"
  }
}