Atlas Artifact Provider

Terraform has a provider for managing Atlas artifacts called atlas_artifact.

This is used to make data stored in Atlas Artifacts available to Terraform for interpolation. In the following example, an artifact is defined and references an AMI ID stored in Atlas.

provider "atlas" {
  # You can also set the atlas token by exporting
  # ATLAS_TOKEN into your env
  token = "${var.atlas_token}"
}

resource "atlas_artifact" "web-worker" {
  name = "acmeinc/web-worker"
  type = "amazon.image"
  version = "latest"
}

resource "aws_instance" "worker-machine" {
  ami = "${atlas_artifact.web-worker.metadata_full.region-us-east-1}"
  instance_type = "m1.small"
}

This automatically pulls the "latest" artifact version.

Following a new artifact version being created via a Packer build, the following diff would be generated when running terraform plan.

-/+ aws_instance.worker-machine
    ami:             "ami-168f9d7e" => "ami-2f3a9df2" (forces new resource)
    instance_type:   "m1.small" => "m1.small"

This allows you to reference changing artifacts and trigger new deployments upon pushing subsequent Packer builds.

Read more about artifacts in the Terraform documentation.