gistfile1.txt

I want to configure an AWS Launch Config resource to use a local user-data file from the repo. And I set that up okay 
using file(), but variables had to be hard-coded for each stack.  There was no interpolation.  That's fine if each stack 
has their own launch config, but what I'd really like to do is re-use one user-data file for a couple different stacks 
and feed in variables to differentiate between each.

I created a template resource and file and fed in variables, but I'm getting a weird error. Is this the correct approach?



# Code snippet
-------------------
data "template_file" "user-data" {
  template = "${file("${path.module}/../elasticsearch-user-data.sh.tpl")}"

  vars {
    stage="${var.environment}"
    cluster="${local.cluster}"
    cluster_name="${local.cluster_name}"
  }
}

resource "aws_launch_configuration" "cluster" {
  # Static LC names create a problem when updating launch configs.  Append timestamp to make names unique while maintaining backwards compatibility.
  name                        = "${upper(local.cluster_name)}-${replace(timestamp(), ":" , "-")}"
  user_data                 = "${template_file.user-data.template}"
-------------------


# Error Output
-------------------
$ terraform plan

Error: resource 'aws_launch_configuration.cluster' config: unknown resource 'template_file.user-data' referenced in variable template_file.user-data.template
-------------------