terraform-terraform-label

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.

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

Usage

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       = "${map("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       = "${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}"]
}

Makefile Targets

Available targets:

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

Inputs

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

Outputs

Name	Description
attributes	Normalized attributes
id	Disambiguated ID
name	Normalized name
namespace	Normalized namespace
stage	Normalized stage
tags	Normalized Tag map

Related Projects

Check out these related projects.

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

Help

Got a question?

File a GitHub issue, send us an email or join our Slack Community.

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Contributing

Bug Reports & Feature Requests

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Developing

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Fork the repo on GitHub
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Copyright

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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About

This project is maintained and funded by Cloud Posse, LLC. Like it? Please let us know at [email protected]

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Contributors

Erik Osterman	Sarkis Varozian	Andriy Knysh	Jamie Nelson

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