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.
We literally have hundreds of terraform modules that are Open Source and well-maintained. Check them out!
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.
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"]
}
}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]
}Available targets:
help Help screen
help/all Display help for all targets
help/short This help short screen
lint Lint terraform code
| Name | Version |
|---|---|
| terraform | >= 0.12.0 |
No provider.
| Name | Description | Type | Default | Required |
|---|---|---|---|---|
| attributes | Additional attributes (e.g. 1) |
list(string) |
[] |
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) |
{} |
no |
| 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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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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