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Cloud Posse

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 .


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

Terraform Open Source Modules

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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 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.

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]
}

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 >= 0.14.11
aws >= 3.56
random >= 2.0

Providers

Name Version
aws >= 3.56
random >= 2.0

Modules

Name Source Version
label cloudposse/label/null 0.25.0
ssh_access cloudposse/security-group/aws 1.0.1
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"). For AL2 and bottlerocket, 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, BOTTLEROCKET_x86_64, and BOTTLEROCKET_ARM_64.
string "AL2_x86_64" 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_mappings 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)
[
{
"delete_on_termination": true,
"device_name": "/dev/xvda",
"encrypted": true,
"volume_size": 20,
"volume_type": "gp2"
}
]
no
bootstrap_additional_options Additional options to bootstrap.sh. DO NOT include --kubelet-additional-args, use kubelet_additional_args 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 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
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
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 support containerized workloads.
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
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) [] 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.

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See LICENSE for full details.

Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements.  See the NOTICE file
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regarding copyright ownership.  The ASF licenses this file
to you under the Apache License, Version 2.0 (the
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Contributors

Erik Osterman
Erik Osterman
Andriy Knysh
Andriy Knysh
Igor Rodionov
Igor Rodionov

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Terraform module to provision a fully managed AWS EKS Node Group

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