(deprecated) terraform-terraform-label

Deprecated

This module was an experimental fork and is now obsolete and will not be maintained. Any projects using terraform-terraform-label are encouraged to switch to using terraform-null-label, which is actively maintained and used by all current Cloud Posse Terraform modules.

This module was a fork of terraform-null-label, made at a time when that project was using the Terraform null provider (hence the "null" in the name), in order to remove the null provider dependency. This was accomplished by removing outputs that required the null provider.

With the features that became available in Terraform 0.12, the terraform-null-label project was able to retain all of its features and also remove the null provider, removing any incentive to further develop terraform-terraform-label.

With the key distinguishing feature of terraform-terraform-label no longer being a distinguishing feature, this module was no longer necessary, and all focus returned to maintaining and enhancing terraform-null-label, which now far surpasses this module in functionality.

We literally have hundreds of other terraform modules that are Open Source and well-maintained. Check them out!

Historical Description

Terraform module designed to generate consistent label names and tags for resources. Use terraform-terraform-label to implement a strict naming convention.

terraform-terraform-label is a fork of terraform-null-label which uses only the core Terraform provider.

A label follows the following convention: {namespace}-{stage}-{name}-{attributes}. The delimiter (e.g. -) is interchangeable.

It's recommended to use one terraform-terraform-label module for every unique resource of a given resource type. For example, if you have 10 instances, there should be 10 different labels. However, if you have multiple different kinds of resources (e.g. instances, security groups, file systems, and elastic IPs), then they can all share the same label assuming they are logically related.

All Cloud Posse modules use the related terraform-null-label module to ensure resources can be instantiated multiple times within an account and without conflict.

NOTE: The second terraform word in terraform-terraform-label refers to the primary Terraform provider used in this module.

This project was part of our comprehensive "SweetOps" approach towards DevOps.

It's 100% Open Source and licensed under the APACHE2.

Security & Compliance

Security scanning is graciously provided by Bridgecrew. Bridgecrew is the leading fully hosted, cloud-native solution providing continuous Terraform security and compliance.

Benchmark	Description
	This project is no longer being maintained
	Infrastructure Security Compliance
	Center for Internet Security, KUBERNETES Compliance
	Center for Internet Security, AWS Compliance
	Center for Internet Security, AZURE Compliance
	Payment Card Industry Data Security Standards Compliance
	National Institute of Standards and Technology Compliance
	Information Security Management System, ISO/IEC 27001 Compliance
	Service Organization Control 2 Compliance
	Center for Internet Security, GCP Compliance
	Health Insurance Portability and Accountability Compliance

Usage

IMPORTANT: We do not pin modules to versions in our examples because of the difficulty of keeping the versions in the documentation in sync with the latest released versions. We highly recommend that in your code you pin the version to the exact version you are using so that your infrastructure remains stable, and update versions in a systematic way so that they do not catch you by surprise.

Also, because of a bug in the Terraform registry (hashicorp/terraform#21417), the registry shows many of our inputs as required when in fact they are optional. The table below correctly indicates which inputs are required.

Simple Example

Include this repository as a module in your existing terraform code:

module "eg_prod_bastion_label" {
  source = "cloudposse/label/terraform"
  # Cloud Posse recommends pinning every module to a specific version
  # version = "x.x.x"
  namespace  = "eg"
  stage      = "prod"
  name       = "bastion"
  attributes = ["public"]
  delimiter  = "-"

  tags = {
    "BusinessUnit" = "XYZ",
    "Snapshot"     = "true"
  }
}

This will create an id with the value of eg-prod-bastion-public.

Now reference the label when creating an instance (for example):

resource "aws_instance" "eg_prod_bastion_public" {
  instance_type = "t1.micro"
  tags          = module.eg_prod_bastion_label.tags
}

Or define a security group:

resource "aws_security_group" "eg_prod_bastion_public" {
  vpc_id = var.vpc_id
  name   = module.eg_prod_bastion_label.id
  tags   = module.eg_prod_bastion_label.tags
  egress {
    from_port   = 0
    to_port     = 0
    protocol    = "-1"
    cidr_blocks = ["0.0.0.0/0"]
  }
}

Advanced Example

Here is a more complex example with two instances using two different labels. Note how efficiently the tags are defined for both the instance and the security group.

module "eg_prod_bastion_abc_label" {
  source = "cloudposse/label/terraform"
  # Cloud Posse recommends pinning every module to a specific version
  # version = "x.x.x"
  namespace  = "eg"
  stage      = "prod"
  name       = "bastion"
  attributes = ["abc"]
  delimiter  = "-"

  tags = {
    "BusinessUnit" = "ABC"
  }
}

resource "aws_security_group" "eg_prod_bastion_abc" {
  name = module.eg_prod_bastion_abc_label.id
  tags = module.eg_prod_bastion_abc_label.tags
  ingress {
    from_port   = 22
    to_port     = 22
    protocol    = "tcp"
    cidr_blocks = ["0.0.0.0/0"]
  }
}

resource "aws_instance" "eg_prod_bastion_abc" {
  instance_type          = "t1.micro"
  tags                   = module.eg_prod_bastion_abc_label.tags
  vpc_security_group_ids = [aws_security_group.eg_prod_bastion_abc.id]
}

module "eg_prod_bastion_xyz_label" {
  source = "cloudposse/label/terraform"
  # Cloud Posse recommends pinning every module to a specific version
  # version = "x.x.x"
  namespace  = "eg"
  stage      = "prod"
  name       = "bastion"
  attributes = ["xyz"]
  delimiter  = "-"

  tags = {
    "BusinessUnit" = "XYZ"
  }
}

resource "aws_security_group" "eg_prod_bastion_xyz" {
  name = module.eg_prod_bastion_xyz_label.id
  tags = module.eg_prod_bastion_xyz_label.tags
  ingress {
    from_port   = 22
    to_port     = 22
    protocol    = "tcp"
    cidr_blocks = ["0.0.0.0/0"]
  }
}

resource "aws_instance" "eg_prod_bastion_xyz" {
  instance_type          = "t1.micro"
  tags                   = module.eg_prod_bastion_xyz_label.tags
  vpc_security_group_ids = [aws_security_group.eg_prod_bastion_xyz.id]
}

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Copyright

Copyright © 2017-2023 Cloud Posse, LLC

License

See LICENSE for full details.

Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements.  See the NOTICE file
distributed with this work for additional information
regarding copyright ownership.  The ASF licenses this file
to you under the Apache License, Version 2.0 (the
"License"); you may not use this file except in compliance
with the License.  You may obtain a copy of the License at

  https://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing,
software distributed under the License is distributed on an
"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
KIND, either express or implied.  See the License for the
specific language governing permissions and limitations
under the License.

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Contributors

Erik Osterman	Sarkis Varozian	Andriy Knysh	Jamie Nelson