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Patrick de Ruiter
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Add comprehensive README and update module documentation 2025-11-01 10:19:32 +01:00
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SHELL := /bin/bash
# List of targets the `readme` target should call before generating the readme
export README_DEPS ?= docs/targets.md docs/terraform.md
-include $(shell curl -sSL -o .build-harness "https://git.io/build-harness"; echo .build-harness)
## Lint terraform code
lint:
$(SELF) terraform/install terraform/get-modules terraform/get-plugins terraform/lint terraform/validate

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<!--
# Terraform AWS EKS Node Group Module
## Overview
This Terraform module provisions an Amazon EKS Node Group with managed EC2 worker nodes. It provides a production-ready configuration for running containerized workloads on Amazon EKS with support for auto-scaling, custom AMIs, SSH access, and IAM role management.
## Features
- Managed EKS Node Group with auto-scaling capabilities
- Configurable EC2 instance types and disk sizes
- Support for AL2_x86_64 and AL2_x86_64_GPU AMI types
- Optional SSH access with key pairs
- Kubernetes labels support
- IAM roles and policies for worker nodes
- Automatic attachment of required AWS managed policies
- Support for custom IAM policies
- CloudPosse naming conventions for consistent resource naming
- Conditional module enablement
## Resources Created
### Compute
- AWS EKS Node Group
- Auto Scaling Group (managed by EKS)
- EC2 Instances (managed by EKS)
** DO NOT EDIT THIS FILE
**
** This file was automatically generated by the `build-harness`.
** 1) Make all changes to `README.yaml`
** 2) Run `make init` (you only need to do this once)
** 3) Run`make readme` to rebuild this file.
**
** (We maintain HUNDREDS of open source projects. This is how we maintain our sanity.)
**
-->
[![README Header][readme_header_img]][readme_header_link]
[![Cloud Posse][logo]](https://cpco.io/homepage)
# terraform-aws-eks-node-group [![Codefresh Build Status](https://g.codefresh.io/api/badges/pipeline/cloudposse/terraform-modules%2Fterraform-aws-eks-node-group?type=cf-1)](https://g.codefresh.io/public/accounts/cloudposse/pipelines/5dead6c731a1a7177ed48f8e) [![Latest Release](https://img.shields.io/github/release/cloudposse/terraform-aws-eks-node-group.svg)](https://github.com/cloudposse/terraform-aws-eks-node-group/releases/latest) [![Slack Community](https://slack.cloudposse.com/badge.svg)](https://slack.cloudposse.com)
Terraform module to provision an EKS Node Group for [Elastic Container Service for Kubernetes](https://aws.amazon.com/eks/).
Instantiate it multiple times to create many EKS node groups with specific settings such as GPUs, EC2 instance types, or autoscale parameters.
---
This project is part of our comprehensive ["SweetOps"](https://cpco.io/sweetops) approach towards DevOps.
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[![Terraform Open Source Modules](https://docs.cloudposse.com/images/terraform-open-source-modules.svg)][terraform_modules]
It's 100% Open Source and licensed under the [APACHE2](LICENSE).
We literally have [*hundreds of terraform modules*][terraform_modules] that are Open Source and well-maintained. Check them out!
## Introduction
### IAM
- IAM Role for worker nodes
- IAM Role Policy Attachments:
- AmazonEKSWorkerNodePolicy
- AmazonEKS_CNI_Policy
- AmazonEC2ContainerRegistryReadOnly
- Custom policies (optional)
## Usage
**IMPORTANT:** The `master` branch is used in `source` just as an example. In your code, do not pin to `master` because there may be breaking changes between releases.
Instead pin to the release tag (e.g. `?ref=tags/x.y.z`) of one of our [latest releases](https://github.com/cloudposse/terraform-aws-eks-node-group/releases).
For a complete example, see [examples/complete](examples/complete).
For automated tests of the complete example using [bats](https://github.com/bats-core/bats-core) and [Terratest](https://github.com/gruntwork-io/terratest) (which tests and deploys the example on AWS), see [test](test).
### Basic Example
```hcl
provider "aws" {
region = var.region
}
module "eks_node_group" {
source = "git@github.com:webuildyourcloud/terraform-aws-eks_node_group.git?ref=tags/0.0.2"
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
}
# Naming
namespace = "myorg"
stage = "prod"
name = "app"
attributes = []
locals {
tags = merge(module.label.tags, map("kubernetes.io/cluster/${module.label.id}", "shared"))
}
# Cluster Configuration
cluster_name = "my-eks-cluster"
subnet_ids = ["subnet-12345678", "subnet-87654321"]
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
}
# Node Group Sizing
desired_size = 3
min_size = 2
max_size = 5
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
}
# Instance Configuration
instance_types = ["t3.medium"]
disk_size = 20
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
# Kubernetes Labels
kubernetes_labels = {
Environment = "production"
Team = "platform"
}
workers_role_arns = [module.eks_node_group.eks_node_group_role_arn]
workers_security_group_ids = []
}
module "eks_node_group" {
source = "git::https://github.com/cloudposse/terraform-aws-eks-node-group.git?ref=master"
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
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
}
# Tags
tags = {
ManagedBy = "terraform"
}
}
```
### Advanced Example with SSH Access
```hcl
module "eks_node_group" {
source = "git@github.com:webuildyourcloud/terraform-aws-eks_node_group.git?ref=tags/0.0.2"
namespace = "myorg"
stage = "prod"
name = "app"
cluster_name = module.eks_cluster.cluster_id
subnet_ids = module.vpc.private_subnet_ids
# Node Group Configuration
desired_size = 5
min_size = 3
max_size = 10
instance_types = ["t3.large", "t3.xlarge"]
disk_size = 50
## Makefile Targets
# AMI Configuration
ami_type = "AL2_x86_64"
ami_release_version = "1.21.5-20220123"
kubernetes_version = "1.21"
# SSH Access
ec2_ssh_key = "my-keypair"
source_security_group_ids = ["sg-12345678"]
# Custom IAM Policies
existing_workers_role_policy_arns = [
"arn:aws:iam::aws:policy/CloudWatchAgentServerPolicy"
]
existing_workers_role_policy_arns_count = 1
kubernetes_labels = {
NodeType = "general-purpose"
Environment = "production"
}
tags = {
CostCenter = "engineering"
}
}
```
Available targets:
help Help screen
help/all Display help for all targets
help/short This help short screen
lint Lint terraform code
### GPU-Enabled Node Group
```hcl
module "eks_gpu_node_group" {
source = "git@github.com:webuildyourcloud/terraform-aws-eks_node_group.git?ref=tags/0.0.2"
namespace = "myorg"
stage = "prod"
name = "gpu"
cluster_name = module.eks_cluster.cluster_id
subnet_ids = module.vpc.private_subnet_ids
desired_size = 2
min_size = 1
max_size = 4
instance_types = ["g4dn.xlarge"]
ami_type = "AL2_x86_64_GPU"
disk_size = 100
kubernetes_labels = {
NodeType = "gpu"
"nvidia.com/gpu" = "true"
}
}
```
## Inputs
## Variables
| Name | Description | Type | Default | Required |
|------|-------------|:----:|:-----:|:-----:|
| ami_release_version | AMI version of the EKS Node Group. 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`. Terraform will only perform drift detection if a configuration value is provided | string | `AL2_x86_64` | no |
| attributes | Additional attributes (e.g. `1`) | list(string) | `<list>` | no |
| cluster_name | The name of the EKS cluster | string | - | yes |
| delimiter | Delimiter to be used between `namespace`, `stage`, `name` and `attributes` | string | `-` | no |
| desired_size | Desired number of worker nodes | number | - | yes |
| disk_size | Disk size in GiB for worker nodes. Defaults to 20. Terraform will only perform drift detection if a configuration value is provided | number | `20` | no |
| ec2_ssh_key | SSH key name that should be used to access the worker nodes | string | `null` | no |
| enabled | Whether to create the resources. Set to `false` to prevent the module from creating any resources | bool | `true` | no |
| existing_workers_role_policy_arns | List of existing policy ARNs that will be attached to the workers default role on creation | list(string) | `<list>` | no |
| existing_workers_role_policy_arns_count | Count of existing policy ARNs that will be attached to the workers default role on creation. Needed to prevent Terraform error `count can't be computed` | number | `0` | no |
| instance_types | Set of instance types associated with the EKS Node Group. Defaults to ["t3.medium"]. Terraform will only perform drift detection if a configuration value is provided | list(string) | - | yes |
| 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) | `<map>` | 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 |
| max_size | Maximum number of worker nodes | number | - | yes |
| min_size | Minimum number of worker nodes | number | - | yes |
| name | Solution name, e.g. 'app' or 'cluster' | string | - | yes |
| namespace | Namespace, which could be your organization name, e.g. 'eg' or 'cp' | string | `` | no |
| source_security_group_ids | Set of EC2 Security Group IDs to allow SSH access (port 22) from on 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) | `<list>` | no |
| stage | Stage, e.g. 'prod', 'staging', 'dev', or 'test' | string | `` | no |
| subnet_ids | A list of subnet IDs to launch resources in | list(string) | - | yes |
| tags | Additional tags (e.g. `{ BusinessUnit = "XYZ" }` | map(string) | `<map>` | no |
|------|-------------|------|---------|----------|
| namespace | Namespace (e.g., 'eg' or 'cp') | `string` | `""` | no |
| stage | Stage (e.g., 'prod', 'staging', 'dev') | `string` | `""` | no |
| name | Solution name (e.g., 'app' or 'cluster') | `string` | n/a | yes |
| delimiter | Delimiter between namespace, stage, name and attributes | `string` | `"-"` | no |
| attributes | Additional attributes | `list(string)` | `[]` | no |
| tags | Additional tags | `map(string)` | `{}` | no |
| enabled | Enable/disable module resources | `bool` | `true` | no |
| cluster_name | Name of the EKS cluster | `string` | n/a | yes |
| ec2_ssh_key | SSH key name for worker node access | `string` | `null` | no |
| desired_size | Desired number of worker nodes | `number` | n/a | yes |
| max_size | Maximum number of worker nodes | `number` | n/a | yes |
| min_size | Minimum number of worker nodes | `number` | n/a | yes |
| subnet_ids | List of subnet IDs to launch resources in | `list(string)` | n/a | yes |
| existing_workers_role_policy_arns | List of existing policy ARNs to attach | `list(string)` | `[]` | no |
| existing_workers_role_policy_arns_count | Count of existing policy ARNs | `number` | `0` | no |
| ami_type | Type of AMI (AL2_x86_64, AL2_x86_64_GPU) | `string` | `"AL2_x86_64"` | no |
| disk_size | Disk size in GiB for worker nodes | `number` | `20` | no |
| instance_types | List of instance types for EKS Node Group | `list(string)` | n/a | yes |
| kubernetes_labels | Key-value mapping of Kubernetes labels | `map(string)` | `{}` | no |
| ami_release_version | AMI version of the EKS Node Group | `string` | `null` | no |
| kubernetes_version | Kubernetes version | `string` | `null` | no |
| source_security_group_ids | Security Group IDs to allow SSH access | `list(string)` | `[]` | 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_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_id | EKS Cluster name and EKS Node Group name separated by colon |
| eks_node_group_arn | Amazon Resource Name (ARN) of the EKS Node Group |
| eks_node_group_resources | List of objects containing information about underlying resources |
| eks_node_group_status | Status of the EKS Node Group |
## Share the Love
Like this project? Please give it a ★ on [our GitHub](https://github.com/cloudposse/terraform-aws-eks-node-group)! (it helps us **a lot**)
Are you using this project or any of our other projects? Consider [leaving a testimonial][testimonial]. =)
## Related Projects
Check out these related projects.
- [terraform-aws-eks-cluster](https://github.com/cloudposse/terraform-aws-eks-cluster) - Terraform module to provision an EKS cluster on AWS
- [terraform-aws-eks-workers](https://github.com/cloudposse/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](https://github.com/cloudposse/terraform-aws-ec2-autoscale-group) - Terraform module to provision Auto Scaling Group and Launch Template on AWS
- [terraform-aws-ecs-container-definition](https://github.com/cloudposse/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](https://github.com/cloudposse/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](https://github.com/cloudposse/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](https://github.com/cloudposse/terraform-aws-ecs-codepipeline) - Terraform module for CI/CD with AWS Code Pipeline and Code Build for ECS
- [terraform-aws-ecs-cloudwatch-autoscaling](https://github.com/cloudposse/terraform-aws-ecs-cloudwatch-autoscaling) - Terraform module to autoscale ECS Service based on CloudWatch metrics
- [terraform-aws-ecs-cloudwatch-sns-alarms](https://github.com/cloudposse/terraform-aws-ecs-cloudwatch-sns-alarms) - Terraform module to create CloudWatch Alarms on ECS Service level metrics
- [terraform-aws-ec2-instance](https://github.com/cloudposse/terraform-aws-ec2-instance) - Terraform module for providing a general purpose EC2 instance
- [terraform-aws-ec2-instance-group](https://github.com/cloudposse/terraform-aws-ec2-instance-group) - Terraform module for provisioning multiple general purpose EC2 hosts for stateful applications
## Help
**Got a question?** We got answers.
File a GitHub [issue](https://github.com/cloudposse/terraform-aws-eks-node-group/issues), send us an [email][email] or join our [Slack Community][slack].
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## DevOps Accelerator for Startups
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Work directly with our team of DevOps experts via email, slack, and video conferencing.
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## Contributing
### Bug Reports & Feature Requests
Please use the [issue tracker](https://github.com/cloudposse/terraform-aws-eks-node-group/issues) to report any bugs or file feature requests.
### Developing
If you are interested in being a contributor and want to get involved in developing this project or [help out](https://cpco.io/help-out) with our other projects, we would love to hear from you! Shoot us an [email][email].
In general, PRs are welcome. We follow the typical "fork-and-pull" Git workflow.
1. **Fork** the repo on GitHub
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4. **Push** your work back up to your fork
5. 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
Copyright © 2017-2019 [Cloud Posse, LLC](https://cpco.io/copyright)
## License
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See [LICENSE](LICENSE) for full details.
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Unless required by applicable law or agreed to in writing,
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## Trademarks
All other trademarks referenced herein are the property of their respective owners.
## About
This project is maintained and funded by [Cloud Posse, LLC][website]. Like it? Please let us know by [leaving a testimonial][testimonial]!
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### Contributors
| [![Erik Osterman][osterman_avatar]][osterman_homepage]<br/>[Erik Osterman][osterman_homepage] | [![Andriy Knysh][aknysh_avatar]][aknysh_homepage]<br/>[Andriy Knysh][aknysh_homepage] | [![Igor Rodionov][goruha_avatar]][goruha_homepage]<br/>[Igor Rodionov][goruha_homepage] |
|---|---|---|
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## Requirements
| Name | Version |
|------|---------|
| terraform | >= 0.13 |
| aws | ~> 3.27 |
| template | ~> 2.2 |
| local | ~> 2.0 |
## Dependencies
This module uses:
- [cloudposse/terraform-null-label](https://github.com/cloudposse/terraform-null-label) - Resource naming
## IAM Policies
The module automatically attaches the following AWS managed policies to the worker node IAM role:
1. **AmazonEKSWorkerNodePolicy** - Allows worker nodes to connect to EKS cluster
2. **AmazonEKS_CNI_Policy** - Provides IP address management for pods
3. **AmazonEC2ContainerRegistryReadOnly** - Allows pulling images from ECR
Additional custom policies can be attached via `existing_workers_role_policy_arns`.
## Important Notes
1. **Cluster Name**: The `cluster_name` must match an existing EKS cluster
2. **Subnets**: Node groups should typically be deployed in private subnets
3. **Instance Types**: You can specify multiple instance types for better availability
4. **SSH Access**: If `ec2_ssh_key` is specified without `source_security_group_ids`, port 22 will be open to the internet (0.0.0.0/0)
5. **Auto Scaling**: The node group will automatically scale between `min_size` and `max_size` based on pod scheduling needs
6. **Kubernetes Version**: If not specified, the cluster's Kubernetes version will be used
7. **AMI Updates**: When `ami_release_version` is not specified, the latest AMI for the Kubernetes version is used
8. **Tagging**: The module automatically adds `kubernetes.io/cluster/<cluster_name> = "owned"` tag
## Best Practices
1. **Use Multiple Instance Types**: Specify multiple instance types for better EC2 capacity availability
2. **Private Subnets**: Deploy node groups in private subnets for security
3. **Right-Sizing**: Start with conservative instance sizes and scale based on actual usage
4. **Disk Size**: Allocate sufficient disk space for container images and logs (minimum 20 GiB)
5. **Labels**: Use Kubernetes labels for node selection in pod specifications
6. **Security Groups**: Restrict SSH access to specific security groups
7. **IAM Policies**: Only attach necessary custom IAM policies
8. **Version Management**: Pin `ami_release_version` and `kubernetes_version` for consistency
## Kubernetes Integration
After node group creation, nodes automatically join the cluster. You can target specific node groups using node selectors:
```yaml
apiVersion: v1
kind: Pod
metadata:
name: my-pod
spec:
nodeSelector:
Environment: production
Team: platform
containers:
- name: my-container
image: nginx
```
## Scaling Behavior
The node group will automatically scale based on:
- Pod resource requests that cannot be scheduled
- Cluster Autoscaler policies (if installed)
- Manual scaling via AWS console or API
- Kubernetes Horizontal Pod Autoscaler demands
## Troubleshooting
### Nodes not joining cluster
- Verify the cluster name is correct
- Check that subnets have proper tags (`kubernetes.io/cluster/<cluster_name> = "shared"`)
- Ensure IAM role has required policies attached
- Verify security groups allow communication with cluster
### Auto-scaling not working
- Install and configure Cluster Autoscaler
- Verify IAM permissions for auto-scaling
- Check that min/max size allows scaling
### SSH access not working
- Verify `ec2_ssh_key` exists in the region
- Check security group rules allow SSH from your IP
- Ensure bastion host or VPN connectivity to private subnets
## License
This module is provided as-is for use within your organization.

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