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

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Cloud Posse

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

A label follows the following convention: {namespace}-{environment}-{stage}-{name}-{attributes}. The delimiter (e.g. -) is interchangeable. The label items are all optional. So if you prefer the term stage to environment you can exclude environment and the label id will look like {namespace}-{stage}-{name}-{attributes}. If attributes are excluded but stage and environment are included, id will look like {namespace}-{environment}-{stage}-{name}

It's recommended to use one terraform-null-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 null refers to the primary Terraform provider used in this module.

Releases of this module from 0.12.0 onward support HCL2 and only work with Terraform 0.12 or newer. Releases prior to this are compatible with earlier versions of terraform like Terraform 0.11.


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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

module "eg_prod_bastion_label" {
  source     = "git::https://github.com/cloudposse/terraform-null-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 because when generating id, the default order is namespace, environment, stage, name, attributes (you can override it by using the label_order variable, see Advanced Example 3).

Now reference the label when creating an instance:

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-null-label.git?ref=master"
  namespace  = "eg"
  stage      = "prod"
  name       = "bastion"
  attributes = ["abc"]
  delimiter  = "-"

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

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-null-label.git?ref=master"
  namespace  = "eg"
  stage      = "prod"
  name       = "bastion"
  attributes = ["xyz"]
  delimiter  = "-"

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

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]
}

Advanced Example 2

Here is a more complex example with an autoscaling group that has a different tagging schema than other resources and requires its tags to be in this format, which this module can generate:

tags = [
    {
        key = Name,
        propagate_at_launch = 1,
        value = namespace-stage-name
    },
    {
        key = Namespace,
        propagate_at_launch = 1,
        value = namespace
    },
    {
        key = Stage,
        propagate_at_launch = 1,
        value = stage
    }
]

Autoscaling group using propagating tagging below (full example: autoscalinggroup)

################################
# terraform-null-label example #
################################
module "label" {
  source    = "../../"
  namespace = "cp"
  stage     = "prod"
  name      = "app"

  tags = {
    BusinessUnit = "Finance"
    ManagedBy    = "Terraform"
  }

  additional_tag_map = {
    propagate_at_launch = "true"
  }
}

#######################
# Launch template     #
#######################
resource "aws_launch_template" "default" {
  # terraform-null-label example used here: Set template name prefix
  name_prefix                           = "${module.label.id}-"
  image_id                              = data.aws_ami.amazon_linux.id
  instance_type                         = "t2.micro"
  instance_initiated_shutdown_behavior  = "terminate"

  vpc_security_group_ids                = [data.aws_security_group.default.id]

  monitoring {
    enabled                             = false
  }
  # terraform-null-label example used here: Set tags on volumes
  tag_specifications {
    resource_type                       = "volume"
    tags                                = module.label.tags
  }
}

######################
# Autoscaling group  #
######################
resource "aws_autoscaling_group" "default" {
  # terraform-null-label example used here: Set ASG name prefix
  name_prefix                           = "${module.label.id}-"
  vpc_zone_identifier                   = data.aws_subnet_ids.all.ids
  max_size                              = "1"
  min_size                              = "1"
  desired_capacity                      = "1"

  launch_template = {
    id                                  = "aws_launch_template.default.id
    version                             = "$$Latest"
  }

  # terraform-null-label example used here: Set tags on ASG and EC2 Servers
  tags                                  = module.label.tags_as_list_of_maps
}

Advanced Example 3

See complete example

This example shows how you can pass the context output of one label module to the next label_module, allowing you to create one label that has the base set of values, and then creating every extra label as a derivative of that.

module "label1" {
  source      = "git::https://github.com/cloudposse/terraform-null-label.git?ref=master"
  namespace   = "CloudPosse"
  environment = "UAT"
  stage       = "build"
  name        = "Winston Churchroom"
  attributes  = ["fire", "water", "earth", "air"]
  delimiter   = "-"

  label_order = ["name", "environment", "stage", "attributes"]

  tags = {
    "City"        = "Dublin"
    "Environment" = "Private"
  }
}

module "label2" {
  source    = "git::https://github.com/cloudposse/terraform-null-label.git?ref=master"
  context   = module.label1.context
  name      = "Charlie"
  stage     = "test"
  delimiter = "+"

  tags = {
    "City"        = "London"
    "Environment" = "Public"
  }
}

module "label3" {
  source    = "git::https://github.com/cloudposse/terraform-null-label.git?ref=master"
  name      = "Starfish"
  stage     = "release"
  context   = module.label1.context
  delimiter = "."

  tags = {
    "Eat"    = "Carrot"
    "Animal" = "Rabbit"
  }
}

This creates label outputs like this:

label1 = {
  "attributes" = [
    "fire",
    "water",
    "earth",
    "air",
  ]
  "delimiter" = "-"
  "id" = "winstonchurchroom-uat-build-fire-water-earth-air"
  "name" = "winstonchurchroom"
  "namespace" = "cloudposse"
  "stage" = "build"
}
label1_context = {
  "additional_tag_map" = {}
  "attributes" = [
    "fire",
    "water",
    "earth",
    "air",
  ]
  "delimiter" = "-"
  "enabled" = true
  "environment" = "uat"
  "label_order" = [
    "name",
    "environment",
    "stage",
    "attributes",
  ]
  "name" = "winstonchurchroom"
  "namespace" = "cloudposse"
  "regex_replace_chars" = "/[^a-zA-Z0-9-]/"
  "stage" = "build"
  "tags" = {
    "Attributes" = "fire-water-earth-air"
    "City" = "Dublin"
    "Environment" = "Private"
    "Name" = "winstonchurchroom"
    "Namespace" = "cloudposse"
    "Stage" = "build"
  }
}
label1_tags = {
  "Attributes" = "fire-water-earth-air"
  "City" = "Dublin"
  "Environment" = "Private"
  "Name" = "winstonchurchroom"
  "Namespace" = "cloudposse"
  "Stage" = "build"
}
label2 = {
  "attributes" = [
    "fire",
    "water",
    "earth",
    "air",
  ]
  "delimiter" = "+"
  "id" = "charlie+uat+test+firewaterearthair"
  "name" = "charlie"
  "namespace" = "cloudposse"
  "stage" = "test"
}
label2_context = {
  "additional_tag_map" = {}
  "attributes" = [
    "fire",
    "water",
    "earth",
    "air",
  ]
  "delimiter" = "+"
  "enabled" = true
  "environment" = "uat"
  "label_order" = [
    "name",
    "environment",
    "stage",
    "attributes",
  ]
  "name" = "charlie"
  "namespace" = "cloudposse"
  "regex_replace_chars" = "/[^a-zA-Z0-9-]/"
  "stage" = "test"
  "tags" = {
    "Attributes" = "firewaterearthair"
    "City" = "London"
    "Environment" = "Public"
    "Name" = "charlie"
    "Namespace" = "cloudposse"
    "Stage" = "test"
  }
}
label2_tags = {
  "Attributes" = "firewaterearthair"
  "City" = "London"
  "Environment" = "Public"
  "Name" = "charlie"
  "Namespace" = "cloudposse"
  "Stage" = "test"
}
label3 = {
  "attributes" = [
    "fire",
    "water",
    "earth",
    "air",
  ]
  "delimiter" = "."
  "id" = "starfish.uat.release.firewaterearthair"
  "name" = "starfish"
  "namespace" = "cloudposse"
  "stage" = "release"
}
label3_context = {
  "additional_tag_map" = {}
  "attributes" = [
    "fire",
    "water",
    "earth",
    "air",
  ]
  "delimiter" = "."
  "enabled" = true
  "environment" = "uat"
  "label_order" = [
    "name",
    "environment",
    "stage",
    "attributes",
  ]
  "name" = "starfish"
  "namespace" = "cloudposse"
  "regex_replace_chars" = "/[^a-zA-Z0-9-]/"
  "stage" = "release"
  "tags" = {
    "Animal" = "Rabbit"
    "Attributes" = "firewaterearthair"
    "City" = "Dublin"
    "Eat" = "Carrot"
    "Environment" = "uat"
    "Name" = "starfish"
    "Namespace" = "cloudposse"
    "Stage" = "release"
  }
}
label3_tags = {
  "Animal" = "Rabbit"
  "Attributes" = "firewaterearthair"
  "City" = "Dublin"
  "Eat" = "Carrot"
  "Environment" = "uat"
  "Name" = "starfish"
  "Namespace" = "cloudposse"
  "Stage" = "release"
}

Makefile Targets

Available targets:

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

Requirements

Name Version
terraform >= 0.12.0, < 0.14.0

Providers

No provider.

Inputs

Name Description Type Default Required
additional_tag_map Additional tags for appending to each tag map map(string) {} no
attributes Additional attributes (e.g. 1) list(string) [] no
context Default context to use for passing state between label invocations
object({
namespace = string
environment = string
stage = string
name = string
enabled = bool
delimiter = string
attributes = list(string)
label_order = list(string)
tags = map(string)
additional_tag_map = map(string)
regex_replace_chars = string
})
{
"additional_tag_map": {},
"attributes": [],
"delimiter": "",
"enabled": true,
"environment": "",
"label_order": [],
"name": "",
"namespace": "",
"regex_replace_chars": "",
"stage": "",
"tags": {}
}
no
delimiter Delimiter to be used between namespace, environment, stage, name and attributes string "-" no
enabled Set to false to prevent the module from creating any resources bool true no
environment Environment, e.g. 'prod', 'staging', 'dev', 'pre-prod', 'UAT' string "" no
label_order The naming order of the id output and Name tag list(string) [] 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
regex_replace_chars Regex to replace chars with empty string in namespace, environment, stage and name. By default only hyphens, letters and digits are allowed, all other chars are removed string "/[^a-zA-Z0-9-]/" no
stage Stage, e.g. 'prod', 'staging', 'dev', OR 'source', 'build', 'test', 'deploy', 'release' string "" no
tags Additional tags (e.g. map('BusinessUnit','XYZ') map(string) {} no

Outputs

Name Description
attributes List of attributes
context Context of this module to pass to other label modules
delimiter Delimiter between namespace, environment, stage, name and attributes
environment Normalized environment
id Disambiguated ID
label_order The naming order of the id output and Name tag
name Normalized name
namespace Normalized namespace
stage Normalized stage
tags Normalized Tag map
tags_as_list_of_maps Additional tags as a list of maps, which can be used in several AWS resources

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

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Copyright

Copyright © 2017-2020 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
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  https://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing,
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Contributors

Erik Osterman
Erik Osterman
Andriy Knysh
Andriy Knysh
Igor Rodionov
Igor Rodionov
Sergey Vasilyev
Sergey Vasilyev
Michael Pereira
Michael Pereira
Jamie Nelson
Jamie Nelson
Vladimir
Vladimir
Daren Desjardins
Daren Desjardins
Maarten van der Hoef
Maarten van der Hoef

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