Pass metadata between Terraform modules using S3. Much faster than remote state.

Metadata_S3.md

Save outputs from a resource to a YAML file:

# Module Alpha
# https://www.terraform.io/docs/providers/aws/r/s3_bucket_object.html
resource "aws_s3_bucket_object" "outputs" {
  bucket = local.metadata_bucket
  key    = "${local.key_path}/organization.yml"
  content = yamlencode({
    "organization_arn" : aws_organizations_organization.default.arn
    "organization_id" : aws_organizations_organization.default.id
  })
  acl                    = "bucket-owner-full-control"
  content_type           = "text/plain"
  server_side_encryption = "aws:kms"
}

Read the YAML file in the second module

# Module Bravo
# https://www.terraform.io/docs/providers/aws/d/s3_bucket_object.html
data "aws_s3_bucket_object" "organization" {
  bucket = local.metadata_bucket
  key    = local.organization_root_metafile
}

Use data from the file as a value for other resources

organization_arn = yamldecode(data.aws_s3_bucket_object.organization.body).organization_arn