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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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
}
Available targets:
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lint Lint terraform code
Name | Version |
---|---|
terraform | >= 0.13.3 |
aws | >= 3.0 |
local | >= 1.3 |
random | >= 2.0 |
template | >= 2.0 |
Name | Version |
---|---|
aws | >= 3.0 |
random | >= 2.0 |
Name | Source | Version |
---|---|---|
label | cloudposse/label/null | 0.24.1 |
this | cloudposse/label/null | 0.24.1 |
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", 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 |
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 |
{ |
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 when 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 | Instance types to use for this node group (up to 20). Defaults to ["t3.medium"]. Ignored when launch_template_id is supplied. |
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." |
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 |
metadata_http_endpoint | Whether the metadata service is available. Can be enabled or disabled | string |
"enabled" |
no |
metadata_http_put_response_hop_limit | The desired HTTP PUT response hop limit for instance metadata requests. The larger the number, the further instance metadata requests can travel. Can be an integer from 1 to 64 | number |
2 |
no |
metadata_http_tokens | Whether or not the metadata service requires session tokens, also referred to as Instance Metadata Service Version 2 (IMDSv2). Can be optional or required | string |
"optional" |
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 | 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 |
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 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 . |
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 |
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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Check out these related projects.
- terraform-aws-eks-cluster - Terraform module to provision an EKS cluster on AWS
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- 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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