/terraform-terraform-label

Terraform Module to define a consistent naming convention by (namespace, stage, name, [attributes])

Primary LanguageHCLApache License 2.0Apache-2.0

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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 this 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 is part of our comprehensive "SweetOps" approach towards DevOps.

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Usage

IMPORTANT: The master branch is used in source just as an example. In your code, do not pin to master because there may be breaking changes between releases. Instead pin to the release tag (e.g. ?ref=tags/x.y.z) of one of our latest releases.

Simple Example

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

module "eg_prod_bastion_label" {
  source     = "git::https://github.com/cloudposse/terraform-terraform-label.git?ref=master"
  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     = "git::https://github.com/cloudposse/terraform-terraform-label.git?ref=master"
  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     = "git::https://github.com/cloudposse/terraform-terraform-label.git?ref=master"
  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]
}

Makefile Targets

Available targets:

  help                                Help screen
  help/all                            Display help for all targets
  help/short                          This help short screen
  lint                                Lint terraform code

Inputs

Name Description Type Default Required
attributes Additional attributes (e.g. 1) list(string) <list> no
convert_case Convert fields to lower case bool true no
delimiter Delimiter to be used between namespace, stage, name and attributes string - no
enabled Set to false to prevent the module from creating any resources bool true no
name Solution name, e.g. app or jenkins string `` no
namespace Namespace, which could be your organization name or abbreviation, e.g. 'eg' or 'cp' string `` no
stage Stage, e.g. 'prod', 'staging', 'dev' string `` no
tags Additional tags (e.g. map('BusinessUnit','XYZ') map(string) <map> no

Outputs

Name Description
attributes Normalized attributes
delimiter Delimiter between namespace, stage, name and attributes
id Disambiguated ID
name Normalized name
namespace Normalized namespace
stage Normalized stage
tags Normalized Tag map

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Related Projects

Check out these related projects.

  • terraform-null-label - Terraform Module to define a consistent naming convention by (namespace, stage, name, [attributes])

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Copyright

Copyright © 2017-2019 Cloud Posse, LLC

License

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
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Contributors

Erik Osterman
Erik Osterman
Sarkis Varozian
Sarkis Varozian
Andriy Knysh
Andriy Knysh
Jamie Nelson
Jamie Nelson

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