GitHub - eaze/terraform-aws-eks-iam-role: Terraform module to provision an EKS IAM Role for Service Account

This terraform-aws-eks-iam-role project provides a simplified mechanism for provisioning AWS EKS Service Account IAM roles.

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Usage

Here's how to invoke this module in your projects

module "eks_iam_role" {
  source = "cloudposse/eks-iam-role/aws"
  # Cloud Posse recommends pinning every module to a specific version
  # version     = "x.x.x"

  namespace   = var.namespace
  environment = var.environment
  stage       = var.stage
  name        = var.name
  delimiter   = var.delimiter
  attributes  = var.attributes
  tags        = var.tags

  aws_account_number          = local.account_id
  eks_cluster_oidc_issuer_url = module.eks_cluster.eks_cluster_identity_oidc_issuer

  # Create a role for the service account named `autoscaler` in the Kubernetes namespace `kube-system`
  service_account_name      = "autoscaler"
  service_account_namespace = "kube-system"
  # JSON IAM policy document to assign to the service account role
  aws_iam_policy_document = [data.aws_iam_policy_document.autoscaler.json]
}

data "aws_iam_policy_document" "autoscaler" {
  statement {
    sid = "AllowToScaleEKSNodeGroupAutoScalingGroup"

    actions = [
      "ec2:DescribeLaunchTemplateVersions",
      "autoscaling:TerminateInstanceInAutoScalingGroup",
      "autoscaling:SetDesiredCapacity",
      "autoscaling:DescribeTags",
      "autoscaling:DescribeLaunchConfigurations",
      "autoscaling:DescribeAutoScalingInstances",
      "autoscaling:DescribeAutoScalingGroups"
    ]

    effect    = "Allow"
    resources = ["*"]
  }
}

Important

In Cloud Posse's examples, we avoid pinning modules to specific versions to prevent discrepancies between the documentation and the latest released versions. However, for your own projects, we strongly advise pinning each module to the exact version you're using. This practice ensures the stability of your infrastructure. Additionally, we recommend implementing a systematic approach for updating versions to avoid unexpected changes.

Examples

Here is an example of using this module:

examples/complete - complete example of using this module

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	>= 1.2.0
aws	>= 3.0
local	>= 1.2

Providers

Name	Version
aws	>= 3.0

Modules

Name	Source	Version
service_account_label	cloudposse/label/null	0.25.0
this	cloudposse/label/null	0.25.0

Resources

Name	Type
aws_iam_policy.service_account	resource
aws_iam_role.service_account	resource
aws_iam_role_policy_attachment.managed	resource
aws_iam_role_policy_attachment.service_account	resource
aws_caller_identity.current	data source
aws_iam_policy_document.service_account_assume_role	data source

Inputs

Name	Description	Type	Default	Required
additional_tag_map	Additional key-value pairs to add to each map in `tags_as_list_of_maps`. Not added to `tags` or `id`. This is for some rare cases where resources want additional configuration of tags and therefore take a list of maps with tag key, value, and additional configuration.	`map(string)`	`{}`	no
attributes	ID element. Additional attributes (e.g. `workers` or `cluster`) to add to `id`, in the order they appear in the list. New attributes are appended to the end of the list. The elements of the list are joined by the `delimiter` and treated as a single ID element.	`list(string)`	`[]`	no
aws_account_number	AWS account number of EKS cluster owner. If an AWS account number is not provided, the current aws provider account number will be used.	`string`	`null`	no
aws_iam_policy_document	JSON string representation of the IAM policy for this service account as list of string (0 or 1 items). If empty, no custom IAM policy document will be used. If the list contains a single document, a custom IAM policy will be created and attached to the IAM role. Can also be a plain string, but that use is DEPRECATED because of Terraform issues.	`any`	`[]`	no
aws_partition	AWS partition: 'aws', 'aws-cn', or 'aws-us-gov'	`string`	`"aws"`	no
context	Single object for setting entire context at once. See description of individual variables for details. Leave string and numeric variables as `null` to use default value. Individual variable settings (non-null) override settings in context object, except for attributes, tags, and additional_tag_map, which are merged.	`any`	{ "additional_tag_map": {}, "attributes": [], "delimiter": null, "descriptor_formats": {}, "enabled": true, "environment": null, "id_length_limit": null, "label_key_case": null, "label_order": [], "label_value_case": null, "labels_as_tags": [ "unset" ], "name": null, "namespace": null, "regex_replace_chars": null, "stage": null, "tags": {}, "tenant": null }	no
delimiter	Delimiter to be used between ID elements. Defaults to `-` (hyphen). Set to `""` to use no delimiter at all.	`string`	`null`	no
descriptor_formats	Describe additional descriptors to be output in the `descriptors` output map. Map of maps. Keys are names of descriptors. Values are maps of the form `{<br/> format = string<br/> labels = list(string)<br/>}` (Type is `any` so the map values can later be enhanced to provide additional options.) `format` is a Terraform format string to be passed to the `format()` function. `labels` is a list of labels, in order, to pass to `format()` function. Label values will be normalized before being passed to `format()` so they will be identical to how they appear in `id`. Default is `{}` (`descriptors` output will be empty).	`any`	`{}`	no
eks_cluster_oidc_issuer_url	OIDC issuer URL for the EKS cluster (initial "https://" may be omitted)	`string`	n/a	yes
enabled	Set to false to prevent the module from creating any resources	`bool`	`null`	no
environment	ID element. Usually used for region e.g. 'uw2', 'us-west-2', OR role 'prod', 'staging', 'dev', 'UAT'	`string`	`null`	no
id_length_limit	Limit `id` to this many characters (minimum 6). Set to `0` for unlimited length. Set to `null` for keep the existing setting, which defaults to `0`. Does not affect `id_full`.	`number`	`null`	no
label_key_case	Controls the letter case of the `tags` keys (label names) for tags generated by this module. Does not affect keys of tags passed in via the `tags` input. Possible values: `lower`, `title`, `upper`. Default value: `title`.	`string`	`null`	no
label_order	The order in which the labels (ID elements) appear in the `id`. Defaults to ["namespace", "environment", "stage", "name", "attributes"]. You can omit any of the 6 labels ("tenant" is the 6th), but at least one must be present.	`list(string)`	`null`	no
label_value_case	Controls the letter case of ID elements (labels) as included in `id`, set as tag values, and output by this module individually. Does not affect values of tags passed in via the `tags` input. Possible values: `lower`, `title`, `upper` and `none` (no transformation). Set this to `title` and set `delimiter` to `""` to yield Pascal Case IDs. Default value: `lower`.	`string`	`null`	no
labels_as_tags	Set of labels (ID elements) to include as tags in the `tags` output. Default is to include all labels. Tags with empty values will not be included in the `tags` output. Set to `[]` to suppress all generated tags. Notes: The value of the `name` tag, if included, will be the `id`, not the `name`. Unlike other `null-label` inputs, the initial setting of `labels_as_tags` cannot be changed in later chained modules. Attempts to change it will be silently ignored.	`set(string)`	[ "default" ]	no
managed_policy_arns	List of managed policies to attach to created role	`set(string)`	`[]`	no
name	ID element. Usually the component or solution name, e.g. 'app' or 'jenkins'. This is the only ID element not also included as a `tag`. The "name" tag is set to the full `id` string. There is no tag with the value of the `name` input.	`string`	`null`	no
namespace	ID element. Usually an abbreviation of your organization name, e.g. 'eg' or 'cp', to help ensure generated IDs are globally unique	`string`	`null`	no
permissions_boundary	ARN of the policy that is used to set the permissions boundary for the role.	`string`	`null`	no
regex_replace_chars	Terraform regular expression (regex) string. Characters matching the regex will be removed from the ID elements. If not set, `"/[^a-zA-Z0-9-]/"` is used to remove all characters other than hyphens, letters and digits.	`string`	`null`	no
service_account_name	Kubernetes ServiceAccount name. Leave empty or set to "*" to indicate all Service Accounts, or if using `service_account_namespace_name_list`.	`string`	`null`	no
service_account_namespace	Kubernetes Namespace where service account is deployed. Leave empty or set to "*" to indicate all Namespaces, or if using `service_account_namespace_name_list`.	`string`	`null`	no
service_account_namespace_name_list	List of `namespace:name` for service account assume role IAM policy if you need more than one. May include wildcards.	`list(string)`	`[]`	no
stage	ID element. Usually used to indicate role, e.g. 'prod', 'staging', 'source', 'build', 'test', 'deploy', 'release'	`string`	`null`	no
tags	Additional tags (e.g. `{'BusinessUnit': 'XYZ'}`). Neither the tag keys nor the tag values will be modified by this module.	`map(string)`	`{}`	no
tenant	ID element _(Rarely used, not included by default)_. A customer identifier, indicating who this instance of a resource is for	`string`	`null`	no

Outputs

Name	Description
service_account_name	Kubernetes Service Account name
service_account_namespace	Kubernetes Service Account namespace
service_account_policy_arn	IAM policy ARN
service_account_policy_id	IAM policy ID
service_account_policy_name	IAM policy name
service_account_role_arn	IAM role ARN
service_account_role_name	IAM role name
service_account_role_unique_id	IAM role unique ID

Related Projects

Check out these related projects.

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

References

For additional context, refer to some of these links.

Terraform Standard Module Structure - HashiCorp's standard module structure is a file and directory layout we recommend for reusable modules distributed in separate repositories.
Terraform Module Requirements - HashiCorp's guidance on all the requirements for publishing a module. Meeting the requirements for publishing a module is extremely easy.
Terraform random_integer Resource - The resource random_integer generates random values from a given range, described by the min and max attributes of a given resource.
Terraform Version Pinning - The required_version setting can be used to constrain which versions of the Terraform CLI can be used with your configuration

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✨ Contributing

This project is under active development, and we encourage contributions from our community.

Many thanks to our outstanding contributors:

For 🐛 bug reports & feature requests, please use the issue tracker.

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

Review our Code of Conduct and Contributor Guidelines.
Fork the repo on GitHub
Clone the project to your own machine
Commit changes to your own branch
Push your work back up to your fork
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!

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License

Preamble to the Apache License, Version 2.0

Complete license is available in the LICENSE file.

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

Name		Name	Last commit message	Last commit date
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.github		.github
docs		docs
examples/complete		examples/complete
test		test
.editorconfig		.editorconfig
.gitignore		.gitignore
LICENSE		LICENSE
Makefile		Makefile
README.md		README.md
README.yaml		README.yaml
context.tf		context.tf
main.tf		main.tf
outputs.tf		outputs.tf
variables.tf		variables.tf
versions.tf		versions.tf

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