How can I add a tag to AWS EBS when creating through EC2 with Terraform?

Question

I'm trying to create an EC2 instance for a TEST environment, which uses an AMI of PROD. Everything is creating correctly, but I can't add figure out how to add tags to the EBS volumes that are created along with it?

The tags work on the EC2 but don't get applied to the EBS or root volume. I tried adding a tag map on those as well but that was invalid. Any ideas?

provider "aws" {
  region = "us-east-1"
}

data "aws_ami" "existing_sft_ami" {
  most_recent = true

  filter {
    name   = "name"
    values = [var.prod_name]
  }
  owners = [
    var.aws_account_id]
}

data "aws_subnet" "subnet" {
  id = var.aws_subnet_id
}

resource "aws_instance" "sftp" {
  ami           = data.aws_ami.existing_sft_ami.id
  instance_type = "t2.micro"
  availability_zone = var.availability_zone
  subnet_id = data.aws_subnet.subnet.id
  key_name = var.ssh_key_name
  vpc_security_group_ids = [var.aws_security_group_id]
  root_block_device {
    delete_on_termination = true
  }
  ebs_block_device {
    device_name = "/dev/sdb"
    delete_on_termination = true
  }
  tags = {
    Name = var.name
    Owner = var.owner
    Created = formatdate("DD MMM YYYY hh:mm ZZZ", timestamp())
    Environment = "TEST"
  }
}

Answer 1

You need to use the additional volume_tags argument to tag the volumes. Also, to make your code a little more DRY, you can do this with a locals block.

locals {
    tags = {
        Name = var.name
        Owner = var.owner
        Created = formatdate("DD MMM YYYY hh:mm ZZZ", timestamp())
        Environment = var.environment
    }
}

resource "aws_instance" "sftp" {
  ami           = data.aws_ami.existing_sft_ami.id
  instance_type = "t2.micro"
  availability_zone = var.availability_zone
  subnet_id = data.aws_subnet.subnet.id
  key_name = var.ssh_key_name
  vpc_security_group_ids = [var.aws_security_group_id]
  root_block_device {
    delete_on_termination = true
  }
  ebs_block_device {
    device_name = "/dev/sdb"
    delete_on_termination = true
  }
  tags = local.tags
  volume_tags = local.tags
}