/terraform-aws-eks-iam-role

Terraform module to provision an EKS IAM Role for Service Account

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Cloud Posse

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

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

Terraform Open Source Modules

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!

Security & Compliance

Security scanning is graciously provided by Bridgecrew. Bridgecrew is the leading fully hosted, cloud-native solution providing continuous Terraform security and compliance.

Benchmark Description
Infrastructure Security Infrastructure Security Compliance
CIS KUBERNETES Center for Internet Security, KUBERNETES Compliance
CIS AWS Center for Internet Security, AWS Compliance
CIS AZURE Center for Internet Security, AZURE Compliance
PCI-DSS Payment Card Industry Data Security Standards Compliance
NIST-800-53 National Institute of Standards and Technology Compliance
ISO27001 Information Security Management System, ISO/IEC 27001 Compliance
SOC2 Service Organization Control 2 Compliance
CIS GCP Center for Internet Security, GCP Compliance
HIPAA Health Insurance Portability and Accountability Compliance

Usage

IMPORTANT: We do not pin modules to versions in our examples because of the difficulty of keeping the versions in the documentation in sync with the latest released versions. We highly recommend that in your code you pin the version to the exact version you are using so that your infrastructure remains stable, and update versions in a systematic way so that they do not catch you by surprise.

Also, because of a bug in the Terraform registry (hashicorp/terraform#21417), the registry shows many of our inputs as required when in fact they are optional. The table below correctly indicates which inputs are required.

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 = ["*"]
  }
}

Examples

Here is an 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 >= 0.13.0
aws >= 2.0
local >= 1.2

Providers

Name Version
aws >= 2.0

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.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
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 string n/a yes
service_account_namespace Kubernetes Namespace where service account is deployed string n/a yes
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

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

Copyrights

Copyright © 2020-2022 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
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About

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Contributors

Erik Osterman
Erik Osterman		 Andriy Knysh
Andriy Knysh		 RB
RB

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