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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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!
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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.
With the 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 1.0 is out. Before that, there was Terraform version 0.15, 0.14, 0.13 and so on. The v0.25.0 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.
- This code examples below are manually updated and have a tendency to fall out of sync with actual clode, particularly with respect to usage of other modules. Do not rely on them.
- The documentation on this page about this module's inputs, output, 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.
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 = "x.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 = "x.x.x"
availability_zones = var.availability_zones
vpc_id = module.vpc.vpc_id
igw_id = module.vpc.igw_id
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 = "x.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 = "x.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]
}
Available targets:
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lint Lint terraform code
Name | Version |
---|---|
terraform | >= 0.14.11 |
aws | >= 3.56 |
local | >= 1.3 |
random | >= 2.0 |
template | >= 2.0 |
Name | Version |
---|---|
aws | >= 3.56 |
random | >= 2.0 |
Name | Source | Version |
---|---|---|
label | cloudposse/label/null | 0.25.0 |
ssh_access | cloudposse/security-group/aws | 0.4.0 |
this | cloudposse/label/null | 0.25.0 |
Name | Type |
---|---|
aws_eks_node_group.cbd | resource |
aws_eks_node_group.default | 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_cni_policy | 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_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_launch_template.this | data source |
aws_partition.current | data source |
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. "1.16.13-20200821" (no "v"). 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 , and AL2_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 andany keys supported by the ebs block of launch_template . |
list(any) |
[ |
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 |
{ |
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 beidentical 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 |
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) |
[ |
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({ |
[] |
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 bechanged in later chained modules. Attempts to change it will be silently ignored. |
set(string) |
[ |
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({ |
[] |
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, thatis 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". | 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 modulemay 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 provideyour 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 |
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_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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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
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- 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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