terraform-aws-eks-cluster

Terraform module to provision an EKS cluster on AWS.

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!

Introduction

The module provisions the following resources:

EKS cluster of master nodes that can be used together with the terraform-aws-eks-workers, terraform-aws-eks-node-group and terraform-aws-eks-fargate-profile modules to create a full-blown cluster
IAM Role to allow the cluster to access other AWS services
Security Group which is used by EKS workers to connect to the cluster and kubelets and pods to receive communication from the cluster control plane
The module creates and automatically applies an authentication ConfigMap to allow the workers nodes to join the cluster and to add additional users/roles/accounts

NOTE: The module works with Terraform Cloud.

NOTE: In auth.tf, we added ignore_changes = [data["mapRoles"]] to the kubernetes_config_map for the following reason:

We provision the EKS cluster and then the Kubernetes Auth ConfigMap to map additional roles/users/accounts to Kubernetes groups
Then we wait for the cluster to become available and for the ConfigMap to get provisioned (see data "null_data_source" "wait_for_cluster_and_kubernetes_configmap" in examples/complete/main.tf)
Then we provision a managed Node Group
Then EKS updates the Auth ConfigMap and adds worker roles to it (for the worker nodes to join the cluster)
Since the ConfigMap is modified outside of Terraform state, Terraform wants to update it (remove the roles that EKS added) on each plan/apply

If you want to modify the Node Group (e.g. add more Node Groups to the cluster) or need to map other IAM roles to Kubernetes groups, set the variable kubernetes_config_map_ignore_role_changes to false and re-provision the module. Then set kubernetes_config_map_ignore_role_changes back to true.

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 Compliance
	Center for Internet Security, KUBERNETES Compliance
	Center for Internet Security, AWS Compliance
	Center for Internet Security, AZURE Compliance
	Payment Card Industry Data Security Standards Compliance
	National Institute of Standards and Technology Compliance
	Information Security Management System, ISO/IEC 27001 Compliance
	Service Organization Control 2 Compliance
	Center for Internet Security, GCP Compliance
	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.

For a complete example, see examples/complete.

For automated tests of the complete example using bats and Terratest (which tests and deploys the example on AWS), see test.

Other examples:

terraform-root-modules/eks - Cloud Posse's service catalog of "root module" invocations for provisioning reference architectures
terraform-root-modules/eks-backing-services-peering - example of VPC peering between the EKS VPC and backing services VPC

  provider "aws" {
    region = var.region
  }

  module "label" {
    source = "cloudposse/label/null"
    # Cloud Posse recommends pinning every module to a specific version
    # version     = "x.x.x"
    namespace  = var.namespace
    name       = var.name
    stage      = var.stage
    delimiter  = var.delimiter
    attributes = compact(concat(var.attributes, list("cluster")))
    tags       = var.tags
  }

  locals {
    # The usage of the specific kubernetes.io/cluster/* resource tags below are required
    # for EKS and Kubernetes to discover and manage networking resources
    # https://www.terraform.io/docs/providers/aws/guides/eks-getting-started.html#base-vpc-networking
    tags = merge(var.tags, map("kubernetes.io/cluster/${module.label.id}", "shared"))

    # Unfortunately, most_recent (https://github.com/cloudposse/terraform-aws-eks-workers/blob/34a43c25624a6efb3ba5d2770a601d7cb3c0d391/main.tf#L141)
    # variable does not work as expected, if you are not going to use custom AMI you should
    # enforce usage of eks_worker_ami_name_filter variable to set the right kubernetes version for EKS workers,
    # otherwise the first version of Kubernetes supported by AWS (v1.11) for EKS workers will be used, but
    # EKS control plane will use the version specified by kubernetes_version variable.
    eks_worker_ami_name_filter = "amazon-eks-node-${var.kubernetes_version}*"
  }

  module "vpc" {
    source = "cloudposse/vpc/aws"
    # Cloud Posse recommends pinning every module to a specific version
    # version     = "x.x.x"
    namespace  = var.namespace
    stage      = var.stage
    name       = var.name
    attributes = var.attributes
    cidr_block = "172.16.0.0/16"
    tags       = local.tags
  }

  module "subnets" {
    source = "cloudposse/dynamic-subnets/aws"
    # Cloud Posse recommends pinning every module to a specific version
    # version     = "x.x.x"
    availability_zones   = var.availability_zones
    namespace            = var.namespace
    stage                = var.stage
    name                 = var.name
    attributes           = var.attributes
    vpc_id               = module.vpc.vpc_id
    igw_id               = module.vpc.igw_id
    cidr_block           = module.vpc.vpc_cidr_block
    nat_gateway_enabled  = false
    nat_instance_enabled = false
    tags                 = local.tags
  }

  module "eks_workers" {
    source = "cloudposse/eks-workers/aws"
    # Cloud Posse recommends pinning every module to a specific version
    # version     = "x.x.x"
    namespace                          = var.namespace
    stage                              = var.stage
    name                               = var.name
    attributes                         = var.attributes
    tags                               = var.tags
    instance_type                      = var.instance_type
    eks_worker_ami_name_filter          = local.eks_worker_ami_name_filter
    vpc_id                             = module.vpc.vpc_id
    subnet_ids                         = module.subnets.public_subnet_ids
    health_check_type                  = var.health_check_type
    min_size                           = var.min_size
    max_size                           = var.max_size
    wait_for_capacity_timeout          = var.wait_for_capacity_timeout
    cluster_name                       = module.label.id
    cluster_endpoint                   = module.eks_cluster.eks_cluster_endpoint
    cluster_certificate_authority_data = module.eks_cluster.eks_cluster_certificate_authority_data
    cluster_security_group_id          = module.eks_cluster.security_group_id

    # Auto-scaling policies and CloudWatch metric alarms
    autoscaling_policies_enabled           = var.autoscaling_policies_enabled
    cpu_utilization_high_threshold_percent = var.cpu_utilization_high_threshold_percent
    cpu_utilization_low_threshold_percent  = var.cpu_utilization_low_threshold_percent
  }

  module "eks_cluster" {
    source = "cloudposse/eks-cluster/aws"
    # Cloud Posse recommends pinning every module to a specific version
    # version     = "x.x.x"
    namespace  = var.namespace
    stage      = var.stage
    name       = var.name
    attributes = var.attributes
    tags       = var.tags
    vpc_id     = module.vpc.vpc_id
    subnet_ids = module.subnets.public_subnet_ids

    kubernetes_version    = var.kubernetes_version
    oidc_provider_enabled = false
    workers_role_arns     = [module.eks_workers.workers_role_arn]

    security_group_rules = [
      {
        type                     = "egress"
        from_port                = 0
        to_port                  = 65535
        protocol                 = "-1"
        cidr_blocks              = ["0.0.0.0/0"]
        source_security_group_id = null
        description              = "Allow all outbound traffic"
      },
      {
        type                     = "ingress"
        from_port                = 0
        to_port                  = 65535
        protocol                 = "-1"
        cidr_blocks              = []
        source_security_group_id = module.eks_workers.security_group_id
        description              = "Allow all inbound traffic from EKS workers Security Group"
      }
    ]
  }

Module usage with two worker groups:

  module "eks_workers" {
    source = "cloudposse/eks-workers/aws"
    # Cloud Posse recommends pinning every module to a specific version
    # version     = "x.x.x"
    namespace                          = var.namespace
    stage                              = var.stage
    name                               = "small"
    attributes                         = var.attributes
    tags                               = var.tags
    instance_type                      = "t3.small"
    vpc_id                             = module.vpc.vpc_id
    subnet_ids                         = module.subnets.public_subnet_ids
    health_check_type                  = var.health_check_type
    min_size                           = var.min_size
    max_size                           = var.max_size
    wait_for_capacity_timeout          = var.wait_for_capacity_timeout
    cluster_name                       = module.label.id
    cluster_endpoint                   = module.eks_cluster.eks_cluster_endpoint
    cluster_certificate_authority_data = module.eks_cluster.eks_cluster_certificate_authority_data
    cluster_security_group_id          = module.eks_cluster.security_group_id

    # Auto-scaling policies and CloudWatch metric alarms
    autoscaling_policies_enabled           = var.autoscaling_policies_enabled
    cpu_utilization_high_threshold_percent = var.cpu_utilization_high_threshold_percent
    cpu_utilization_low_threshold_percent  = var.cpu_utilization_low_threshold_percent
  }

  module "eks_workers_2" {
    source = "cloudposse/eks-workers/aws"
    # Cloud Posse recommends pinning every module to a specific version
    # version     = "x.x.x"
    namespace                          = var.namespace
    stage                              = var.stage
    name                               = "medium"
    attributes                         = var.attributes
    tags                               = var.tags
    instance_type                      = "t3.medium"
    vpc_id                             = module.vpc.vpc_id
    subnet_ids                         = module.subnets.public_subnet_ids
    health_check_type                  = var.health_check_type
    min_size                           = var.min_size
    max_size                           = var.max_size
    wait_for_capacity_timeout          = var.wait_for_capacity_timeout
    cluster_name                       = module.label.id
    cluster_endpoint                   = module.eks_cluster.eks_cluster_endpoint
    cluster_certificate_authority_data = module.eks_cluster.eks_cluster_certificate_authority_data
    cluster_security_group_id          = module.eks_cluster.security_group_id

    # Auto-scaling policies and CloudWatch metric alarms
    autoscaling_policies_enabled           = var.autoscaling_policies_enabled
    cpu_utilization_high_threshold_percent = var.cpu_utilization_high_threshold_percent
    cpu_utilization_low_threshold_percent  = var.cpu_utilization_low_threshold_percent
  }

  module "eks_cluster" {
    source = "cloudposse/eks-cluster/aws"
    # Cloud Posse recommends pinning every module to a specific version
    # version     = "x.x.x"
    namespace  = var.namespace
    stage      = var.stage
    name       = var.name
    attributes = var.attributes
    tags       = var.tags
    vpc_id     = module.vpc.vpc_id
    subnet_ids = module.subnets.public_subnet_ids

    kubernetes_version    = var.kubernetes_version
    oidc_provider_enabled = false
    workers_role_arns     = [module.eks_workers.workers_role_arn, module.eks_workers_2.workers_role_arn]

    security_group_rules = [
      {
        type                     = "egress"
        from_port                = 0
        to_port                  = 65535
        protocol                 = "-1"
        cidr_blocks              = ["0.0.0.0/0"]
        source_security_group_id = null
        description              = "Allow all outbound traffic"
      },
      {
        type                     = "ingress"
        from_port                = 0
        to_port                  = 65535
        protocol                 = "-1"
        cidr_blocks              = []
        source_security_group_id = module.eks_workers.security_group_id
        description              = "Allow all inbound traffic from EKS workers Security Group"
      },
      {
        type                     = "ingress"
        from_port                = 0
        to_port                  = 65535
        protocol                 = "-1"
        cidr_blocks              = []
        source_security_group_id = module.eks_workers_2.security_group_id
        description              = "Allow all inbound traffic from EKS workers Security Group"
      }
  }

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
kubernetes	>= 1.0
local	>= 1.3
null	>= 2.0
template	>= 2.0
tls	>= 2.2.0

Providers

Name	Version
aws	>= 2.0
kubernetes	>= 1.0
null	>= 2.0
tls	>= 2.2.0

Modules

Name	Source	Version
label	cloudposse/label/null	0.24.1
security_group	cloudposse/security-group/aws	0.3.1
this	cloudposse/label/null	0.24.1

Resources

Name	Type
aws_cloudwatch_log_group.default	resource
aws_eks_cluster.default	resource
aws_iam_openid_connect_provider.default	resource
aws_iam_role.default	resource
aws_iam_role_policy.cluster_elb_service_role	resource
aws_iam_role_policy_attachment.amazon_eks_cluster_policy	resource
aws_iam_role_policy_attachment.amazon_eks_service_policy	resource
aws_kms_alias.cluster	resource
aws_kms_key.cluster	resource
kubernetes_config_map.aws_auth	resource
kubernetes_config_map.aws_auth_ignore_changes	resource
null_resource.wait_for_cluster	resource
aws_eks_cluster.eks	data source
aws_eks_cluster_auth.eks	data source
aws_iam_policy_document.assume_role	data source
aws_iam_policy_document.cluster_elb_service_role	data source
aws_partition.current	data source
tls_certificate.cluster	data source

Inputs

Name	Description	Type	Default	Required
additional_tag_map	Additional tags for appending to tags_as_list_of_maps. Not added to `tags`.	`map(string)`	`{}`	no
apply_config_map_aws_auth	Whether to apply the ConfigMap to allow worker nodes to join the EKS cluster and allow additional users, accounts and roles to acces the cluster	`bool`	`true`	no
attributes	Additional attributes (e.g. `1`)	`list(string)`	`[]`	no
cluster_encryption_config_enabled	Set to `true` to enable Cluster Encryption Configuration	`bool`	`true`	no
cluster_encryption_config_kms_key_deletion_window_in_days	Cluster Encryption Config KMS Key Resource argument - key deletion windows in days post destruction	`number`	`10`	no
cluster_encryption_config_kms_key_enable_key_rotation	Cluster Encryption Config KMS Key Resource argument - enable kms key rotation	`bool`	`true`	no
cluster_encryption_config_kms_key_id	KMS Key ID to use for cluster encryption config	`string`	`""`	no
cluster_encryption_config_kms_key_policy	Cluster Encryption Config KMS Key Resource argument - key policy	`string`	`null`	no
cluster_encryption_config_resources	Cluster Encryption Config Resources to encrypt, e.g. ['secrets']	`list(any)`	[ "secrets" ]	no
cluster_log_retention_period	Number of days to retain cluster logs. Requires `enabled_cluster_log_types` to be set. See https://docs.aws.amazon.com/en_us/eks/latest/userguide/control-plane-logs.html.	`number`	`0`	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, "enabled": true, "environment": null, "id_length_limit": null, "label_key_case": null, "label_order": [], "label_value_case": null, "name": null, "namespace": null, "regex_replace_chars": null, "stage": null, "tags": {} }	no
delimiter	Delimiter to be used between `namespace`, `environment`, `stage`, `name` and `attributes`. Defaults to `-` (hyphen). Set to `""` to use no delimiter at all.	`string`	`null`	no
eks_cluster_service_role_arn	The ARN of an externally created EKS service role to use, or leave blank to create one	`string`	`null`	no
enabled	Set to false to prevent the module from creating any resources	`bool`	`null`	no
enabled_cluster_log_types	A list of the desired control plane logging to enable. For more information, see https://docs.aws.amazon.com/en_us/eks/latest/userguide/control-plane-logs.html. Possible values [`api`, `audit`, `authenticator`, `controllerManager`, `scheduler`]	`list(string)`	`[]`	no
endpoint_private_access	Indicates whether or not the Amazon EKS private API server endpoint is enabled. Default to AWS EKS resource and it is false	`bool`	`false`	no
endpoint_public_access	Indicates whether or not the Amazon EKS public API server endpoint is enabled. Default to AWS EKS resource and it is true	`bool`	`true`	no
environment	Environment, e.g. 'uw2', 'us-west-2', OR '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 default, which is `0`. Does not affect `id_full`.	`number`	`null`	no
kubernetes_config_map_ignore_role_changes	Set to `true` to ignore IAM role changes in the Kubernetes Auth ConfigMap	`bool`	`true`	no
kubernetes_version	Desired Kubernetes master version. If you do not specify a value, the latest available version is used	`string`	`"1.15"`	no
label_key_case	The letter case of label keys (`tag` names) (i.e. `name`, `namespace`, `environment`, `stage`, `attributes`) to use in `tags`. Possible values: `lower`, `title`, `upper`. Default value: `title`.	`string`	`null`	no
label_order	The naming order of the id output and Name tag. Defaults to ["namespace", "environment", "stage", "name", "attributes"]. You can omit any of the 5 elements, but at least one must be present.	`list(string)`	`null`	no
label_value_case	The letter case of output label values (also used in `tags` and `id`). Possible values: `lower`, `title`, `upper` and `none` (no transformation). Default value: `lower`.	`string`	`null`	no
local_exec_interpreter	shell to use for local_exec	`list(string)`	[ "/bin/sh", "-c" ]	no
map_additional_aws_accounts	Additional AWS account numbers to add to `config-map-aws-auth` ConfigMap	`list(string)`	`[]`	no
map_additional_iam_roles	Additional IAM roles to add to `config-map-aws-auth` ConfigMap	list(object({ rolearn = string username = string groups = list(string) }))	`[]`	no
map_additional_iam_users	Additional IAM users to add to `config-map-aws-auth` ConfigMap	list(object({ userarn = string username = string groups = list(string) }))	`[]`	no
name	Solution name, e.g. 'app' or 'jenkins'	`string`	`null`	no
namespace	Namespace, which could be your organization name or abbreviation, e.g. 'eg' or 'cp'	`string`	`null`	no
oidc_provider_enabled	Create an IAM OIDC identity provider for the cluster, then you can create IAM roles to associate with a service account in the cluster, instead of using kiam or kube2iam. For more information, see https://docs.aws.amazon.com/eks/latest/userguide/enable-iam-roles-for-service-accounts.html	`bool`	`false`	no
permissions_boundary	If provided, all IAM roles will be created with this permissions boundary attached.	`string`	`null`	no
public_access_cidrs	Indicates which CIDR blocks can access the Amazon EKS public API server endpoint when enabled. EKS defaults this to a list with 0.0.0.0/0.	`list(string)`	[ "0.0.0.0/0" ]	no
regex_replace_chars	Regex to replace chars with empty string in `namespace`, `environment`, `stage` and `name`. If not set, `"/[^a-zA-Z0-9-]/"` is used to remove all characters other than hyphens, letters and digits.	`string`	`null`	no
region	AWS Region	`string`	n/a	yes
security_group_description	The Security Group description.	`string`	`"Security Group for EKS cluster"`	no
security_group_enabled	Whether to create default Security Group for EKS cluster.	`bool`	`true`	no
security_group_rules	A list of maps of Security Group rules. The values of map is fully complated with `aws_security_group_rule` resource. To get more info see https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/security_group_rule .	`list(any)`	[ { "cidr_blocks": [ "0.0.0.0/0" ], "description": "Allow all outbound traffic", "from_port": 0, "protocol": "-1", "to_port": 65535, "type": "egress" } ]	no
security_group_use_name_prefix	Whether to create a default Security Group with unique name beginning with the normalized prefix.	`bool`	`false`	no
security_groups	A list of Security Group IDs to associate with EKS cluster.	`list(string)`	`[]`	no
stage	Stage, e.g. 'prod', 'staging', 'dev', OR 'source', 'build', 'test', 'deploy', 'release'	`string`	`null`	no
subnet_ids	A list of subnet IDs to launch the cluster in	`list(string)`	n/a	yes
tags	Additional tags (e.g. `map('BusinessUnit','XYZ')`	`map(string)`	`{}`	no
vpc_id	VPC ID for the EKS cluster	`string`	n/a	yes
wait_for_cluster_command	`local-exec` command to execute to determine if the EKS cluster is healthy. Cluster endpoint are available as environment variable `ENDPOINT`	`string`	`"curl --silent --fail --retry 60 --retry-delay 5 --retry-connrefused --insecure --output /dev/null $ENDPOINT/healthz"`	no
workers_role_arns	List of Role ARNs of the worker nodes	`list(string)`	`[]`	no

Outputs

Name	Description
cluster_encryption_config_enabled	If true, Cluster Encryption Configuration is enabled
cluster_encryption_config_provider_key_alias	Cluster Encryption Config KMS Key Alias ARN
cluster_encryption_config_provider_key_arn	Cluster Encryption Config KMS Key ARN
cluster_encryption_config_resources	Cluster Encryption Config Resources
eks_cluster_arn	The Amazon Resource Name (ARN) of the cluster
eks_cluster_certificate_authority_data	The Kubernetes cluster certificate authority data
eks_cluster_endpoint	The endpoint for the Kubernetes API server
eks_cluster_id	The name of the cluster
eks_cluster_identity_oidc_issuer	The OIDC Identity issuer for the cluster
eks_cluster_identity_oidc_issuer_arn	The OIDC Identity issuer ARN for the cluster that can be used to associate IAM roles with a service account
eks_cluster_managed_security_group_id	Security Group ID that was created by EKS for the cluster. EKS creates a Security Group and applies it to ENI that is attached to EKS Control Plane master nodes and to any managed workloads
eks_cluster_role_arn	ARN of the EKS cluster IAM role
eks_cluster_version	The Kubernetes server version of the cluster
kubernetes_config_map_id	ID of `aws-auth` Kubernetes ConfigMap
security_group_arn	ARN of the EKS cluster Security Group
security_group_id	ID of the EKS cluster Security Group
security_group_name	Name of the EKS cluster Security Group

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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.

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!

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.

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 by leaving a testimonial!

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

We offer paid support on all of our projects.

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

Contributors

Erik Osterman	Andriy Knysh	Igor Rodionov	Oscar	Vladimir Syromyatnikov

Name		Name	Last commit message	Last commit date
Latest commit History 59 Commits
.github		.github
docs		docs
examples/complete		examples/complete
test		test
.gitignore		.gitignore
LICENSE		LICENSE
Makefile		Makefile
README.md		README.md
README.yaml		README.yaml
auth.tf		auth.tf
context.tf		context.tf
iam.tf		iam.tf
main.tf		main.tf
outputs.tf		outputs.tf
sg.tf		sg.tf
variables.tf		variables.tf
versions.tf		versions.tf

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