Skip to content

Latest commit

 

History

History
557 lines (420 loc) · 19.1 KB

README.md

File metadata and controls

557 lines (420 loc) · 19.1 KB

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])

Help

Got a question?

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

Commercial Support

Work directly with our team of DevOps experts via email, slack, and video conferencing.

We provide commercial support for all of our Open Source projects. As a Dedicated Support customer, you have access to our team of subject matter experts at a fraction of the cost of a full-time engineer.

E-Mail

  • Questions. We'll use a Shared Slack channel between your team and ours.
  • Troubleshooting. We'll help you triage why things aren't working.
  • Code Reviews. We'll review your Pull Requests and provide constructive feedback.
  • Bug Fixes. We'll rapidly work to fix any bugs in our projects.
  • Build New Terraform Modules. We'll develop original modules to provision infrastructure.
  • Cloud Architecture. We'll assist with your cloud strategy and design.
  • Implementation. We'll provide hands-on support to implement our reference architectures.

Community Forum

Get access to our Open Source Community Forum on Slack. It's FREE to join for everyone! Our "SweetOps" community is where you get to talk with others who share a similar vision for how to rollout and manage infrastructure. This is the best place to talk shop, ask questions, solicit feedback, and work together as a community to build sweet infrastructure.

Contributing

Bug Reports & Feature Requests

Please use the issue tracker to report any bugs or file feature requests.

Developing

If you are interested in being a contributor and want to get involved in developing this project or help out with our other projects, we would love to hear from you! Shoot us an email.

In general, PRs are welcome. We follow the typical "fork-and-pull" Git workflow.

  1. Fork the repo on GitHub
  2. Clone the project to your own machine
  3. Commit changes to your own branch
  4. Push your work back up to your fork
  5. Submit a Pull Request so that we can review your changes

NOTE: Be sure to merge the latest changes from "upstream" before making a pull request!

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
"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.

Trademarks

All other trademarks referenced herein are the property of their respective owners.

About

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

Cloud Posse

We're a DevOps Professional Services company based in Los Angeles, CA. We love Open Source Software!

We offer paid support on all of our projects.

Check out our other projects, apply for a job, or hire us to help with your cloud strategy and implementation.

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