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

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Cloud Posse

terraform-null-label Build Status Latest Release Slack Community

Terraform module designed to generate consistent label 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 perfer 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.


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

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

Usage

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       = "${map("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       = "${map("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-null-label.git?ref=master"
  namespace  = "eg"
  stage      = "prod"
  name       = "bastion"
  attributes = ["xyz"]
  delimiter  = "-"
  tags       = "${map("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}"]
}

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"]

  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"

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

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

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

This creates label outputs like this:

label1 = {
  attributes = fire-water-earth-air
  id = winstonchurchroom-uat-build-fire-water-earth-air
  name = winstonchurchroom
  namespace = cloudposse
  stage = build
}
label1_context = {
  attributes = [fire-water-earth-air]
  delimiter = [-]
  environment = [uat]
  label_order = [name environment stage attributes]
  name = [winstonchurchroom]
  namespace = [cloudposse]
  stage = [build]
  tags_keys = [City Environment Name Namespace Stage]
  tags_values = [Dublin Private winstonchurchroom-uat-build-fire-water-earth-air cloudposse build]
}
label1_tags = {
  City = Dublin
  Environment = Private
  Name = winstonchurchroom-uat-build-fire-water-earth-air
  Namespace = cloudposse
  Stage = build
}
label2 = {
  attributes = fire-water-earth-air
  id = charlie-uat-test-fire-water-earth-air
  name = charlie
  namespace = cloudposse
  stage = test
}
label2_context = {
  attributes = [fire-water-earth-air]
  delimiter = [-]
  environment = [uat]
  label_order = [name environment stage attributes]
  name = [charlie]
  namespace = [cloudposse]
  stage = [test]
  tags_keys = [City Environment Name Namespace Stage]
  tags_values = [London Public charlie-uat-test-fire-water-earth-air cloudposse test]
}
label2_tags = {
  City = London
  Environment = Public
  Name = charlie-uat-test-fire-water-earth-air
  Namespace = cloudposse
  Stage = test
}
label3 = {
  attributes =
  id = release-starfish
  name = starfish
  namespace =
  stage = release
}
label3_context = {
  attributes = []
  delimiter = [-]
  environment = []
  label_order = [namespace environment stage name attributes]
  name = [starfish]
  namespace = []
  stage = [release]
  tags_keys = [Animal Eat Environment Name Namespace Stage]
  tags_values = [Rabbit Carrot  release-starfish  release]
}
label3_tags = {
  Animal = Rabbit
  Eat = Carrot
  Environment =
  Name = release-starfish
  Namespace =
  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

Inputs

Name Description Type Default Required
additional_tag_map Additional tags for appending to each tag map map <map> no
attributes Additional attributes (e.g. 1) list <list> no
context Default context to use for passing state between label invocations map <map> no
delimiter Delimiter to be used between name, namespace, stage, etc. string - no
enabled Set to false to prevent the module from creating any resources string 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 <list> no
name Solution name, e.g. 'app' or 'jenkins' string `` no
namespace Namespace, which could be your organization name, e.g. 'eg' or 'cp' string `` 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 <map> no

Outputs

Name Description
attributes Normalized attributes
context Context of this module to pass between other modules
delimiter Delimiter used in label ID
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

Related Projects

Check out these related projects.

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

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Copyright

Copyright © 2017-2018 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
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  https://www.apache.org/licenses/LICENSE-2.0

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