terraform-aws-eks-node-group

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

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.

    provider "aws" {
      region = var.region
    }

    module "label" {
      source     = "git::https://github.com/cloudposse/terraform-null-label.git?ref=tags/0.16.0"
      namespace  = var.namespace
      name       = var.name
      stage      = var.stage
      delimiter  = var.delimiter
      attributes = compact(concat(var.attributes, list("cluster")))
      tags       = var.tags
    }

    locals {
      tags = merge(module.label.tags, map("kubernetes.io/cluster/${module.label.id}", "shared"))
    }

    module "vpc" {
      source     = "git::https://github.com/cloudposse/terraform-aws-vpc.git?ref=tags/0.8.1"
      namespace  = var.namespace
      stage      = var.stage
      name       = var.name
      attributes = var.attributes
      cidr_block = var.vpc_cidr_block
      tags       = local.tags
    }

    module "subnets" {
      source               = "git::https://github.com/cloudposse/terraform-aws-dynamic-subnets.git?ref=tags/0.18.1"
      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_cluster" {
      source                = "git::https://github.com/cloudposse/terraform-aws-eks-cluster.git?ref=tags/0.13.0"
      namespace             = var.namespace
      stage                 = var.stage
      name                  = var.name
      attributes            = var.attributes
      tags                  = var.tags
      region                = var.region
      vpc_id                = module.vpc.vpc_id
      subnet_ids            = module.subnets.public_subnet_ids
      kubernetes_version    = var.kubernetes_version
      kubeconfig_path       = var.kubeconfig_path
      oidc_provider_enabled = var.oidc_provider_enabled

      workers_role_arns          = [module.eks_node_group.eks_node_group_role_arn]
      workers_security_group_ids = []
    }

    module "eks_node_group" {
      source = "cloudposse/eks-node-group/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
      subnet_ids                = module.subnets.public_subnet_ids
      instance_types            = var.instance_types
      desired_size              = var.desired_size
      min_size                  = var.min_size
      max_size                  = var.max_size
      cluster_name              = module.eks_cluster.eks_cluster_id
      kubernetes_version        = var.kubernetes_version
    }

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	>= 0.13.3
aws	>= 3.0
local	>= 1.3
random	>= 2.0
template	>= 2.0

Providers

Name	Version
aws	>= 3.0
random	>= 2.0

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
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	`string`	`""`	no
ami_image_id	AMI to use. Ignored of `launch_template_id` is supplied.	`string`	`null`	no
ami_release_version	EKS AMI version to use, e.g. "1.16.13-20200821" (no "v"). Defaults to latest version for Kubernetes version.	`string`	`null`	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`, and `AL2_ARM_64`.	`string`	`"AL2_x86_64"`	no
attributes	Additional attributes (e.g. `1`)	`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	`string`	`""`	no
bootstrap_additional_options	Additional options to bootstrap.sh. DO NOT include `--kubelet-additional-args`, use `kubelet_additional_args` var instead.	`string`	`""`	no
capacity_type	Type of capacity associated with the EKS Node Group. Valid values: ON_DEMAND, SPOT. Terraform will only perform drift detection if a configuration value is provided.	`string`	`"ON_DEMAND"`	no
cluster_autoscaler_enabled	Set true to label the node group so that the Kubernetes Cluster Autoscaler will discover and autoscale it	`bool`	`null`	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, "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
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 `namespace`, `environment`, `stage`, `name` and `attributes`. Defaults to `-` (hyphen). Set to `""` to use no delimiter at all.	`string`	`null`	no
desired_size	Initial desired number of worker nodes (external changes ignored)	`number`	n/a	yes
disk_size	Disk size in GiB for worker nodes. Defaults to 20. Ignored it `launch_template_id` is supplied. Terraform will only perform drift detection if a configuration value is provided.	`number`	`20`	no
disk_type	If provided, will be used as volume type of created ebs disk on EC2 instances	`string`	`null`	no
ec2_ssh_key	SSH key pair name to use to access the worker nodes	`string`	`null`	no
enable_cluster_autoscaler	(Deprecated, use `cluster_autoscaler_enabled`) Set true to allow Kubernetes Cluster Auto Scaler to scale the node group	`bool`	`null`	no
enabled	Set to false to prevent the module from creating any resources	`bool`	`null`	no
environment	Environment, e.g. 'uw2', 'us-west-2', OR 'prod', 'staging', 'dev', 'UAT'	`string`	`null`	no
existing_workers_role_policy_arns	List of existing policy ARNs that will be attached to the workers default role on creation	`list(string)`	`[]`	no
existing_workers_role_policy_arns_count	Obsolete and ignored. Allowed for backward compatibility.	`number`	`0`	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
instance_types	Single instance type to use for this node group, passed as a list. Defaults to ["t3.medium"]. It is a list because Launch Templates take a list, and it is a single type because EKS only supports a single type per node group.	`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."	`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	Key-value mapping of Kubernetes taints.	`map(string)`	`{}`	no
kubernetes_version	Kubernetes version. Defaults to EKS Cluster Kubernetes version. Terraform will only perform drift detection if a configuration value is provided	`string`	`null`	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
launch_template_disk_encryption_enabled	Enable disk encryption for the created launch template (if we aren't provided with an existing launch template)	`bool`	`false`	no
launch_template_disk_encryption_kms_key_id	Custom KMS Key ID to encrypt EBS volumes on EC2 instances, applicable only if `launch_template_disk_encryption_enabled` is set to true	`string`	`""`	no
launch_template_name	The name (not ID) of a custom launch template to use for the EKS node group. If provided, it must specify the AMI image id.	`string`	`null`	no
launch_template_version	The version of the specified launch template to use. Defaults to latest version.	`string`	`null`	no
max_size	Maximum number of worker nodes	`number`	n/a	yes
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	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
permissions_boundary	If provided, all IAM roles will be created with this permissions boundary attached.	`string`	`null`	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
resources_to_tag	List of auto-launched resource types to tag. Valid types are "instance", "volume", "elastic-gpu", "spot-instances-request".	`list(string)`	`[]`	no
node_role_explicit_self_trust	Toggle for creating an explicit statement in the trust policy so that the Node Group IAM role can assume itself.	`bool`	`true`	no
source_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	Stage, e.g. 'prod', 'staging', 'dev', OR '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. `map('BusinessUnit','XYZ')`	`map(string)`	`{}`	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`.	`string`	`null`	no
worker_role_autoscale_iam_enabled	If true, the worker IAM role will be authorized to perform autoscaling operations. Not recommended. Use EKS IAM role for cluster autoscaler service account instead.	`bool`	`false`	no

Outputs

Name	Description
eks_node_group_arn	Amazon Resource Name (ARN) of the EKS Node Group
eks_node_group_id	EKS Cluster name and EKS Node Group name separated by a colon
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

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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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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

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Contributors

Erik Osterman	Andriy Knysh	Igor Rodionov

Name		Name	Last commit message	Last commit date
Latest commit History 37 Commits
.github		.github
docs		docs
examples/complete		examples/complete
test		test
.gitattributes		.gitattributes
.gitignore		.gitignore
LICENSE		LICENSE
Makefile		Makefile
README.md		README.md
README.yaml		README.yaml
ami.tf		ami.tf
context.tf		context.tf
iam.tf		iam.tf
launch-template.tf		launch-template.tf
main.tf		main.tf
outputs.tf		outputs.tf
security-group.tf		security-group.tf
userdata.tf		userdata.tf
userdata.tpl		userdata.tpl
variables.tf		variables.tf
versions.tf		versions.tf

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