Terraform module to provision an EKS Node Group for Elastic Container Service for Kubernetes.

Instantiate it multiple times to create many EKS node groups with specific settings such as GPUs, EC2 instance types, or autoscale parameters.

IMPORTANT: This module provisions an EKS Node Group nodes globally accessible by SSH (22) port. Normally, AWS recommends that no security group allows unrestricted ingress access to port 22 .

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Introduction

Usage

Major Changes (breaking and otherwise)

With the v2.0.0 (a.k.a. v0.25.0) release of this module, it has undergone major breaking changes and added new features. Please see the migration document for details.

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.

Terraform Version

Terraform version 1.0 is out. Before that, there was Terraform version 0.15, 0.14, 0.13 and so on. The v2.0.0 release of this module drops support for Terraform 0.13. That version is old and has lots of known issues. There are hardly any breaking changes between Terraform 0.13 and 1.0, so please upgrade to the latest Terraform version before raising any issues about this module.

Sources of Information

• The code examples below are manually updated and have a tendency to fall out of sync with actual code, particularly with respect to usage of other modules. Do not rely on them.
• The documentation on this page about this module's inputs, outputs, and compliance is all automatically generated and is up-to-date as of the release date. After the code itself, this is your best source of information.
• The code in examples/complete is automatically tested before every release, so that is a good place to look for verified example code. Keep in mind, however, it is code for testing, so it may not represent average use cases or best practices.
• Of course, the READMEs and examples/complete directories in the other modules' GitHub repos are more authoritative with respect to how to use those modules than this README is.

Example Code

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 = ["cluster"]
  tags       = var.tags
}

locals {
  # Prior to Kubernetes 1.19, 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 = { "kubernetes.io/cluster/${module.label.id}" = "shared" }
}

module "vpc" {
  source = "cloudposse/vpc/aws"
  # Cloud Posse recommends pinning every module to a specific version
  # version = "1.x.x"

  cidr_block = "172.16.0.0/16"

  tags    = local.tags
  context = module.label.context
}

module "subnets" {
  source = "cloudposse/dynamic-subnets/aws"
  # Cloud Posse recommends pinning every module to a specific version
  # version = "2.x.x"

  availability_zones   = var.availability_zones
  vpc_id               = module.vpc.vpc_id
  igw_id               = [module.vpc.igw_id]
  ipv4_cidr_block      = [module.vpc.vpc_cidr_block]
  nat_gateway_enabled  = true
  nat_instance_enabled = false

  tags    = local.tags
  context = module.label.context
}

module "eks_cluster" {
  source = "cloudposse/eks-cluster/aws"
  # Cloud Posse recommends pinning every module to a specific version
  # version = "2.x.x"

  vpc_id     = module.vpc.vpc_id
  subnet_ids = module.subnets.public_subnet_ids

  kubernetes_version    = var.kubernetes_version
  oidc_provider_enabled = true

  context = module.label.context
}

module "eks_node_group" {
  source = "cloudposse/eks-node-group/aws"
  # Cloud Posse recommends pinning every module to a specific version
  # version     = "2.x.x"

  instance_types        = [var.instance_type]
  subnet_ids            = module.subnets.public_subnet_ids
  min_size              = var.min_size
  max_size              = var.max_size
  cluster_name          = module.eks_cluster.eks_cluster_id
  create_before_destroy = true
  kubernetes_version    = var.kubernetes_version == null || var.kubernetes_version == "" ? [] : [var.kubernetes_version]

  # Enable the Kubernetes cluster auto-scaler to find the auto-scaling group
  cluster_autoscaler_enabled = var.autoscaling_policies_enabled

  context = module.label.context

  # Ensure the cluster is fully created before trying to add the node group
  module_depends_on = [module.eks_cluster.kubernetes_config_map_id]
}

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.

Makefile Targets

Available targets:

  help                                Help screen
  help/all                            Display help for all targets
  help/short                          This help short screen
  lint                                Lint terraform code

Windows Managed Node groups

Windows managed node-groups have a few pre-requisites.

• Your cluster must contain at least one linux based worker node
• Your EKS Cluster must have the AmazonEKSVPCResourceController and AmazonEKSClusterPolicy policies attached
• Your cluster must have a config-map called amazon-vpc-cni with the following content

apiVersion: v1
kind: ConfigMap
metadata:
name: amazon-vpc-cni
namespace: kube-system
data:
enable-windows-ipam: "true"

• Windows nodes will automatically be tainted

kubernetes_taints = [{
  key    = "WINDOWS"
  value  = "true"
  effect = "NO_SCHEDULE"
}]

• Any pods that target Windows will need to have the following attributes set in their manifest

  nodeSelector:
    kubernetes.io/os: windows
    kubernetes.io/arch: amd64

https://docs.aws.amazon.com/eks/latest/userguide/windows-support.html

Requirements

Name	Version
terraform	>= 1.3.0
aws	>= 4.48
random	>= 2.0

Providers

Name	Version
aws	>= 4.48
random	>= 2.0

Modules

Name	Source	Version
label	cloudposse/label/null	0.25.0
ssh_access	cloudposse/security-group/aws	2.2.0
this	cloudposse/label/null	0.25.0

Resources

Name	Type
aws_eks_node_group.cbd	resource
aws_eks_node_group.default	resource
aws_iam_policy.ipv6_eks_cni_policy	resource
aws_iam_role.default	resource
aws_iam_role_policy_attachment.amazon_ec2_container_registry_read_only	resource
aws_iam_role_policy_attachment.amazon_eks_worker_node_policy	resource
aws_iam_role_policy_attachment.existing_policies_for_eks_workers_role	resource
aws_iam_role_policy_attachment.ipv6_eks_cni_policy	resource
aws_launch_template.default	resource
random_pet.cbd	resource
aws_ami.selected	data source
aws_eks_cluster.this	data source
aws_iam_policy_document.assume_role	data source
aws_iam_policy_document.ipv6_eks_cni_policy	data source
aws_launch_template.this	data source
aws_partition.current	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
after_cluster_joining_userdata	Additional bash commands to execute on each worker node after joining the EKS cluster (after executing the bootstrap.sh script). For more info, see https://kubedex.com/90-days-of-aws-eks-in-production	list(string)	[]	no
ami_image_id	AMI to use. Ignored if launch_template_id is supplied.	list(string)	[]	no
ami_release_version	EKS AMI version to use, e.g. For AL2 "1.16.13-20200821" or for bottlerocket "1.2.0-ccf1b754" (no "v") or for Windows "2023.02.14". For AL2, bottlerocket and Windows, it defaults to latest version for Kubernetes version.	list(string)	[]	no
ami_type	Type of Amazon Machine Image (AMI) associated with the EKS Node Group. Defaults to AL2_x86_64. Valid values: AL2_x86_64, AL2_x86_64_GPU, AL2_ARM_64, CUSTOM, BOTTLEROCKET_ARM_64, BOTTLEROCKET_x86_64, BOTTLEROCKET_ARM_64_NVIDIA, BOTTLEROCKET_x86_64_NVIDIA, WINDOWS_CORE_2019_x86_64, WINDOWS_FULL_2019_x86_64, WINDOWS_CORE_2022_x86_64, WINDOWS_FULL_2022_x86_64.	string	"AL2_x86_64"	no
associate_cluster_security_group	When true, associate the default cluster security group to the nodes. If disabled the EKS managed security group will not be associated to the nodes and you will need to provide another security group that allows the nodes to communicate with the EKS control plane. Be aware that if no associated_security_group_ids or ssh_access_security_group_ids are provided, then the nodes will have no inbound or outbound rules.	bool	true	no
associated_security_group_ids	A list of IDs of Security Groups to associate the node group with, in addition to the EKS' created security group. These security groups will not be modified.	list(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
before_cluster_joining_userdata	Additional bash commands to execute on each worker node before joining the EKS cluster (before executing the bootstrap.sh script). For more info, see https://kubedex.com/90-days-of-aws-eks-in-production	list(string)	[]	no
block_device_map	Map of block device name specification, see launch_template.block-devices.	map(object({ no_device = optional(bool, null) virtual_name = optional(string, null) ebs = optional(object({ delete_on_termination = optional(bool, true) encrypted = optional(bool, true) iops = optional(number, null) kms_key_id = optional(string, null) snapshot_id = optional(string, null) throughput = optional(number, null) volume_size = optional(number, 20) volume_type = optional(string, "gp3") })) }))	{ "/dev/xvda": { "ebs": {} } }	no
block_device_mappings	DEPRECATED: Use block_device_map instead. List of block device mappings for the launch template. Each list element is an object with a device_name key and any keys supported by the ebs block of launch_template.	list(any)	null	no
bootstrap_additional_options	Additional options to bootstrap.sh. DO NOT include --kubelet-additional-args, use kubelet_additional_options var instead.	list(string)	[]	no
capacity_type	Type of capacity associated with the EKS Node Group. Valid values: "ON_DEMAND", "SPOT", or null. Terraform will only perform drift detection if a configuration value is provided.	string	null	no
cluster_autoscaler_enabled	Set true to label the node group so that the Kubernetes Cluster Autoscaler will discover and autoscale it. Note that even when false, EKS will set the k8s.io/cluster-autoscaler/enabled label to true on the node group.	bool	false	no
cluster_name	The name of the EKS cluster	string	n/a	yes
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
cpu_options	Configuration for the cpu_options Configuration Block of the launch template. Leave list empty for defaults. Pass list with single object with attributes matching the cpu_options block to configure it. Note that this configures the launch template only. Some elements will be ignored by the Auto Scaling Group that actually launches instances. Consult AWS documentation for details.	list(any)	[]	no
create_before_destroy	Set true in order to create the new node group before destroying the old one. If false, the old node group will be destroyed first, causing downtime. Changing this setting will always cause node group to be replaced.	bool	false	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
desired_size	Initial desired number of worker nodes (external changes ignored)	number	n/a	yes
detailed_monitoring_enabled	The launched EC2 instance will have detailed monitoring enabled. Defaults to false	bool	false	no
ebs_optimized	Set false to disable EBS optimization	bool	true	no
ec2_ssh_key_name	SSH key pair name to use to access the worker nodes	list(string)	[]	no
enabled	Set to false to prevent the module from creating any resources	bool	null	no
enclave_enabled	Set to true to enable Nitro Enclaves on the instance.	bool	false	no
environment	ID element. Usually used for region e.g. 'uw2', 'us-west-2', OR role 'prod', 'staging', 'dev', 'UAT'	string	null	no
force_update_version	When updating the Kubernetes version, force Pods to be removed even if PodDisruptionBudget or taint/toleration issues would otherwise prevent them from being removed (and cause the update to fail)	bool	false	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
instance_types	Instance types to use for this node group (up to 20). Defaults to ["t3.medium"]. Must be empty if the launch template configured by launch_template_id specifies an instance type.	list(string)	[ "t3.medium" ]	no
kubelet_additional_options	Additional flags to pass to kubelet. DO NOT include --node-labels or --node-taints, use kubernetes_labels and kubernetes_taints to specify those."	list(string)	[]	no
kubernetes_labels	Key-value mapping of Kubernetes labels. Only labels that are applied with the EKS API are managed by this argument. Other Kubernetes labels applied to the EKS Node Group will not be managed.	map(string)	{}	no
kubernetes_taints	List of key, value, effect objects representing Kubernetes taints. effect must be one of NO_SCHEDULE, NO_EXECUTE, or PREFER_NO_SCHEDULE. key and effect are required, value may be null.	list(object({ key = string value = string effect = string }))	[]	no
kubernetes_version	Kubernetes version. Defaults to EKS Cluster Kubernetes version. Terraform will only perform drift detection if a configuration value is provided	list(string)	[]	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
launch_template_id	The ID (not name) of a custom launch template to use for the EKS node group. If provided, it must specify the AMI image ID.	list(string)	[]	no
launch_template_version	The version of the specified launch template to use. Defaults to latest version.	list(string)	[]	no
max_size	Maximum number of worker nodes	number	n/a	yes
metadata_http_endpoint_enabled	Set false to disable the Instance Metadata Service.	bool	true	no
metadata_http_put_response_hop_limit	The desired HTTP PUT response hop limit (between 1 and 64) for Instance Metadata Service requests. The default is 2 to allows containerized workloads assuming the instance profile, but it's not really recomended. You should use OIDC service accounts instead.	number	2	no
metadata_http_tokens_required	Set true to require IMDS session tokens, disabling Instance Metadata Service Version 1.	bool	true	no
min_size	Minimum number of worker nodes	number	n/a	yes
module_depends_on	Can be any value desired. Module will wait for this value to be computed before creating node group.	any	null	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
node_group_terraform_timeouts	Configuration for the Terraform timeouts Configuration Block of the node group resource. Leave list empty for defaults. Pass list with single object with attributes matching the timeouts block to configure it. Leave attribute values null to preserve individual defaults while setting others.	list(object({ create = string update = string delete = string }))	[]	no
node_role_arn	If provided, assign workers the given role, which this module will not modify	list(string)	[]	no
node_role_cni_policy_enabled	When true, the AmazonEKS_CNI_Policy will be attached to the node IAM role. This used to be required, but it is now recommended that this policy be attached only to the aws-node Kubernetes service account. However, that is difficult to do with Terraform, so this module defaults to the old pattern.	bool	true	no
node_role_permissions_boundary	If provided, all IAM roles will be created with this permissions boundary attached.	string	null	no
node_role_policy_arns	List of policy ARNs to attach to the worker role this module creates in addition to the default ones	list(string)	[]	no
placement	Configuration for the placement Configuration Block of the launch template. Leave list empty for defaults. Pass list with single object with attributes matching the placement block to configure it. Note that this configures the launch template only. Some elements will be ignored by the Auto Scaling Group that actually launches instances. Consult AWS documentation for details.	list(any)	[]	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
replace_node_group_on_version_update	Force Node Group replacement when updating to a new Kubernetes version. If set to false (the default), the Node Groups will be updated in-place	bool	false	no
resources_to_tag	List of auto-launched resource types to tag. Valid types are "instance", "volume", "elastic-gpu", "spot-instances-request", "network-interface".	list(string)	[ "instance", "volume", "network-interface" ]	no
ssh_access_security_group_ids	Set of EC2 Security Group IDs to allow SSH access (port 22) to the worker nodes. If you specify ec2_ssh_key, but do not specify this configuration when you create an EKS Node Group, port 22 on the worker nodes is opened to the Internet (0.0.0.0/0)	list(string)	[]	no
stage	ID element. Usually used to indicate role, e.g. 'prod', 'staging', 'source', 'build', 'test', 'deploy', 'release'	string	null	no
subnet_ids	A list of subnet IDs to launch resources in	list(string)	n/a	yes
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
update_config	Configuration for the eks_node_group update_config Configuration Block. Specify exactly one of max_unavailable (node count) or max_unavailable_percentage (percentage of nodes).	list(map(number))	[]	no
userdata_override_base64	Many features of this module rely on the bootstrap.sh provided with Amazon Linux, and this module may generate "user data" that expects to find that script. If you want to use an AMI that is not compatible with the Amazon Linux bootstrap.sh initialization, then use userdata_override_base64 to provide your own (Base64 encoded) user data. Use "" to prevent any user data from being set. Setting userdata_override_base64 disables kubernetes_taints, kubelet_additional_options, before_cluster_joining_userdata, after_cluster_joining_userdata, and bootstrap_additional_options.	list(string)	[]	no

Outputs

Name	Description
eks_node_group_arn	Amazon Resource Name (ARN) of the EKS Node Group
eks_node_group_cbd_pet_name	The pet name of this node group, if this module generated one
eks_node_group_id	EKS Cluster name and EKS Node Group name separated by a colon
eks_node_group_launch_template_id	The ID of the launch template used for this node group
eks_node_group_launch_template_name	The name of the launch template used for this node group
eks_node_group_remote_access_security_group_id	The ID of the security group generated to allow SSH access to the nodes, if this module generated one
eks_node_group_resources	List of objects containing information about underlying resources of the EKS Node Group
eks_node_group_role_arn	ARN of the worker nodes IAM role
eks_node_group_role_name	Name of the worker nodes IAM role
eks_node_group_status	Status of the EKS Node Group
eks_node_group_tags_all	A map of tags assigned to the resource, including those inherited from the provider default_tags configuration block.
eks_node_group_windows_note	Instructions on changes a user needs to follow or script for a windows node group in the event of a custom ami

Related Projects

Check out these related projects.

• terraform-aws-eks-cluster - Terraform module to provision an EKS cluster on AWS
• terraform-aws-eks-workers - Terraform module to provision an AWS AutoScaling Group, IAM Role, and Security Group for EKS Workers
• terraform-aws-ec2-autoscale-group - Terraform module to provision Auto Scaling Group and Launch Template on AWS
• terraform-aws-ecs-container-definition - Terraform module to generate well-formed JSON documents (container definitions) that are passed to the aws_ecs_task_definition Terraform resource
• terraform-aws-ecs-alb-service-task - Terraform module which implements an ECS service which exposes a web service via ALB
• terraform-aws-ecs-web-app - Terraform module that implements a web app on ECS and supports autoscaling, CI/CD, monitoring, ALB integration, and much more
• terraform-aws-ecs-codepipeline - Terraform module for CI/CD with AWS Code Pipeline and Code Build for ECS
• terraform-aws-ecs-cloudwatch-autoscaling - Terraform module to autoscale ECS Service based on CloudWatch metrics
• terraform-aws-ecs-cloudwatch-sns-alarms - Terraform module to create CloudWatch Alarms on ECS Service level metrics
• terraform-aws-ec2-instance - Terraform module for providing a general purpose EC2 instance
• terraform-aws-ec2-instance-group - Terraform module for provisioning multiple general purpose EC2 hosts for stateful applications

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