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Terraform module to provision an AWS AutoScaling Group, IAM Role, and Security Group for EKS Workers

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Terraform module to provision AWS resources to run EC2 worker nodes for Elastic Kubernetes Service.

Instantiate it multiple times to create many EKS worker node pools with specific settings such as GPUs, EC2 instance types, or autoscale parameters.

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Introduction

The module provisions the following resources:

  • IAM Role and Instance Profile to allow Kubernetes nodes to access other AWS services
  • Security Group with rules for EKS workers to allow networking traffic
  • AutoScaling Group with Launch Template to configure and launch worker instances
  • AutoScaling Policies and CloudWatch Metric Alarms to monitor CPU utilization on the EC2 instances and scale the number of instance in the AutoScaling Group up or down. If you don't want to use the provided functionality, or want to provide your own policies, disable it by setting the variable autoscaling_policies_enabled to "false".

Usage

For a complete example, see examples/complete

  provider "aws" {
    region = var.region
  }

  locals {
    # 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 = merge(var.tags, map("kubernetes.io/cluster/${var.cluster_name}", "shared"))
  }

  module "vpc" {
    source  = "cloudposse/vpc/aws"
    version = "2.1.1"

    namespace = var.namespace
    stage     = var.stage
    name      = var.name

    ipv4_primary_cidr_block = "172.16.0.0/16"
    tags                    = local.tags
  }

  module "subnets" {
    source  = "cloudposse/dynamic-subnets/aws"
    version = "2.4.1"

    namespace = var.namespace
    stage     = var.stage
    name      = var.name

    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  = false
    nat_instance_enabled = false
    tags                 = local.tags
  }

  module "eks_workers" {
    source = "cloudposse/eks-workers/aws"
    # Cloud Posse recommends pinning every module to a specific version
    # version     = "x.x.x"
    namespace                          = var.namespace
    stage                              = var.stage
    name                               = var.name
    instance_type                      = var.instance_type
    vpc_id                             = module.vpc.vpc_id
    subnet_ids                         = module.subnets.public_subnet_ids
    health_check_type                  = var.health_check_type
    min_size                           = var.min_size
    max_size                           = var.max_size
    wait_for_capacity_timeout          = var.wait_for_capacity_timeout
    cluster_name                       = var.cluster_name
    cluster_endpoint                   = var.cluster_endpoint
    cluster_certificate_authority_data = var.cluster_certificate_authority_data
    cluster_security_group_id          = var.cluster_security_group_id

    # Auto-scaling policies and CloudWatch metric alarms
    autoscaling_policies_enabled           = var.autoscaling_policies_enabled
    cpu_utilization_high_threshold_percent = var.cpu_utilization_high_threshold_percent
    cpu_utilization_low_threshold_percent  = var.cpu_utilization_low_threshold_percent
  }

Important

In Cloud Posse's examples, we avoid pinning modules to specific versions to prevent discrepancies between the documentation and the latest released versions. However, for your own projects, we strongly advise pinning each module to the exact version you're using. This practice ensures the stability of your infrastructure. Additionally, we recommend implementing a systematic approach for updating versions to avoid unexpected changes.

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 >= 1.0
aws >= 5.16.0

Providers

Name Version
aws >= 5.16.0

Modules

Name Source Version
autoscale_group cloudposse/ec2-autoscale-group/aws 0.40.0
label cloudposse/label/null 0.25.0
this cloudposse/label/null 0.25.0

Resources

Name Type
aws_iam_instance_profile.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_attach_to_eks_workers_role resource
aws_security_group.default resource
aws_security_group_rule.egress resource
aws_security_group_rule.ingress_cidr_blocks resource
aws_security_group_rule.ingress_cluster resource
aws_security_group_rule.ingress_security_groups resource
aws_security_group_rule.ingress_self resource
aws_ami.eks_worker data source
aws_iam_instance_profile.default data source
aws_iam_policy_document.assume_role data source
aws_partition.current data source

Inputs

Name Description Type Default Required
additional_security_group_ids Additional list of security groups that will be attached to the autoscaling group list(string) [] no
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 commands to execute on each worker node after joining the EKS cluster (after executing the bootstrap.sh script). For mot info, see https://kubedex.com/90-days-of-aws-eks-in-production string "" no
allowed_cidr_blocks List of CIDR blocks to be allowed to connect to the worker nodes list(string) [] no
allowed_security_groups List of Security Group IDs to be allowed to connect to the worker nodes list(string) [] no
associate_public_ip_address Associate a public IP address with an instance in a VPC bool false 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
autoscaling_group_tags Additional tags only for the autoscaling group, e.g. "k8s.io/cluster-autoscaler/node-template/taint/dedicated" = "ci-cd:NoSchedule". map(string) {} no
autoscaling_policies_enabled Whether to create aws_autoscaling_policy and aws_cloudwatch_metric_alarm resources to control Auto Scaling bool true no
aws_iam_instance_profile_name The name of the existing instance profile that will be used in autoscaling group for EKS workers. If empty will create a new instance profile. string "" no
before_cluster_joining_userdata Additional commands to execute on each worker node before joining the EKS cluster (before executing the bootstrap.sh script). For mot info, see https://kubedex.com/90-days-of-aws-eks-in-production string "" no
block_device_mappings Specify volumes to attach to the instance besides the volumes specified by the AMI
list(object({
device_name = string
no_device = bool
virtual_name = string
ebs = object({
delete_on_termination = bool
encrypted = bool
iops = number
kms_key_id = string
snapshot_id = string
volume_size = number
volume_type = string
})
}))
[] no
bootstrap_extra_args Extra arguments to the bootstrap.sh script to enable --enable-docker-bridge or --use-max-pods string "" no
cluster_certificate_authority_data The base64 encoded certificate data required to communicate with the cluster string n/a yes
cluster_endpoint EKS cluster endpoint string n/a yes
cluster_name The name of the EKS cluster string n/a yes
cluster_security_group_id Security Group ID of the EKS cluster string n/a yes
cluster_security_group_ingress_enabled Whether to enable the EKS cluster Security Group as ingress to workers Security Group bool true no
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
cpu_utilization_high_evaluation_periods The number of periods over which data is compared to the specified threshold number 2 no
cpu_utilization_high_period_seconds The period in seconds over which the specified statistic is applied number 300 no
cpu_utilization_high_statistic The statistic to apply to the alarm's associated metric. Either of the following is supported: SampleCount, Average, Sum, Minimum, Maximum string "Average" no
cpu_utilization_high_threshold_percent The value against which the specified statistic is compared number 90 no
cpu_utilization_low_evaluation_periods The number of periods over which data is compared to the specified threshold number 2 no
cpu_utilization_low_period_seconds The period in seconds over which the specified statistic is applied number 300 no
cpu_utilization_low_statistic The statistic to apply to the alarm's associated metric. Either of the following is supported: SampleCount, Average, Sum, Minimum, Maximum string "Average" no
cpu_utilization_low_threshold_percent The value against which the specified statistic is compared number 10 no
credit_specification Customize the credit specification of the instances
object({
cpu_credits = string
})
null no
default_cooldown The amount of time, in seconds, after a scaling activity completes before another scaling activity can start number 300 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
disable_api_termination If true, enables EC2 Instance Termination Protection bool false no
ebs_optimized If true, the launched EC2 instance will be EBS-optimized bool false no
eks_worker_ami_name_filter AMI name filter to lookup the most recent EKS AMI if image_id is not provided string "amazon-eks-node-*" no
eks_worker_ami_name_regex A regex string to apply to the AMI list returned by AWS string "^amazon-eks-node-[0-9,.]+-v[0-9]{8}$" no
elastic_gpu_specifications Specifications of Elastic GPU to attach to the instances
object({
type = string
})
null no
enable_monitoring Enable/disable detailed monitoring bool true no
enabled Set to false to prevent the module from creating any resources bool null no
enabled_metrics A list of metrics to collect. The allowed values are GroupMinSize, GroupMaxSize, GroupDesiredCapacity, GroupInServiceInstances, GroupPendingInstances, GroupStandbyInstances, GroupTerminatingInstances, GroupTotalInstances list(string)
[
"GroupMinSize",
"GroupMaxSize",
"GroupDesiredCapacity",
"GroupInServiceInstances",
"GroupPendingInstances",
"GroupStandbyInstances",
"GroupTerminatingInstances",
"GroupTotalInstances"
]
no
environment ID element. Usually used for region e.g. 'uw2', 'us-west-2', OR role 'prod', 'staging', 'dev', 'UAT' string null no
force_delete Allows deleting the autoscaling group without waiting for all instances in the pool to terminate. You can force an autoscaling group to delete even if it's in the process of scaling a resource. Normally, Terraform drains all the instances before deleting the group. This bypasses that behavior and potentially leaves resources dangling bool false no
health_check_grace_period Time (in seconds) after instance comes into service before checking health number 300 no
health_check_type Controls how health checking is done. Valid values are EC2 or ELB string "EC2" 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
image_id EC2 image ID to launch. If not provided, the module will lookup the most recent EKS AMI. See https://docs.aws.amazon.com/eks/latest/userguide/eks-optimized-ami.html for more details on EKS-optimized images string "" no
instance_initiated_shutdown_behavior Shutdown behavior for the instances. Can be stop or terminate string "terminate" no
instance_market_options The market (purchasing) option for the instances
object({
market_type = string
spot_options = object({
block_duration_minutes = number
instance_interruption_behavior = string
max_price = number
spot_instance_type = string
valid_until = string
})
})
null no
instance_type Instance type to launch string n/a yes
key_name SSH key name that should be used for the instance string "" no
kubelet_extra_args Extra arguments to pass to kubelet, like "--register-with-taints=dedicated=ci-cd:NoSchedule --node-labels=purpose=ci-worker" 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
load_balancers A list of elastic load balancer names to add to the autoscaling group. Only valid for classic load balancers. For ALBs, use target_group_arns instead list(string) [] no
max_instance_lifetime The maximum amount of time, in seconds, that an instance can be in service, values must be either equal to 0 or between 604800 and 31536000 seconds number null no
max_size The maximum size of the autoscale group 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
metrics_granularity The granularity to associate with the metrics to collect. The only valid value is 1Minute string "1Minute" no
min_elb_capacity Setting this causes Terraform to wait for this number of instances to show up healthy in the ELB only on creation. Updates will not wait on ELB instance number changes number 0 no
min_size The minimum size of the autoscale group number n/a yes
mixed_instances_policy policy to used mixed group of on demand/spot of differing types. Launch template is automatically generated. https://www.terraform.io/docs/providers/aws/r/autoscaling_group.html#mixed_instances_policy-1
object({
instances_distribution = object({
on_demand_allocation_strategy = string
on_demand_base_capacity = number
on_demand_percentage_above_base_capacity = number
spot_allocation_strategy = string
spot_instance_pools = number
spot_max_price = string
})
override = list(object({
instance_type = string
weighted_capacity = number
}))
})
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
placement The placement specifications of the instances
object({
affinity = string
availability_zone = string
group_name = string
host_id = string
tenancy = string
})
null no
placement_group The name of the placement group into which you'll launch your instances, if any string "" no
protect_from_scale_in Allows setting instance protection. The autoscaling group will not select instances with this setting for terminination during scale in events bool false 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
scale_down_adjustment_type Specifies whether the adjustment is an absolute number or a percentage of the current capacity. Valid values are ChangeInCapacity, ExactCapacity and PercentChangeInCapacity string "ChangeInCapacity" no
scale_down_cooldown_seconds The amount of time, in seconds, after a scaling activity completes and before the next scaling activity can start number 300 no
scale_down_policy_type The scalling policy type, either SimpleScaling, StepScaling or TargetTrackingScaling string "SimpleScaling" no
scale_down_scaling_adjustment The number of instances by which to scale. scale_down_scaling_adjustment determines the interpretation of this number (e.g. as an absolute number or as a percentage of the existing Auto Scaling group size). A positive increment adds to the current capacity and a negative value removes from the current capacity number -1 no
scale_up_adjustment_type Specifies whether the adjustment is an absolute number or a percentage of the current capacity. Valid values are ChangeInCapacity, ExactCapacity and PercentChangeInCapacity string "ChangeInCapacity" no
scale_up_cooldown_seconds The amount of time, in seconds, after a scaling activity completes and before the next scaling activity can start number 300 no
scale_up_policy_type The scalling policy type, either SimpleScaling, StepScaling or TargetTrackingScaling string "SimpleScaling" no
scale_up_scaling_adjustment The number of instances by which to scale. scale_up_adjustment_type determines the interpretation of this number (e.g. as an absolute number or as a percentage of the existing Auto Scaling group size). A positive increment adds to the current capacity and a negative value removes from the current capacity number 1 no
service_linked_role_arn The ARN of the service-linked role that the ASG will use to call other AWS services 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
suspended_processes A list of processes to suspend for the AutoScaling Group. The allowed values are Launch, Terminate, HealthCheck, ReplaceUnhealthy, AZRebalance, AlarmNotification, ScheduledActions, AddToLoadBalancer. Note that if you suspend either the Launch or Terminate process types, it can prevent your autoscaling group from functioning properly. list(string) [] no
tags Additional tags (e.g. {'BusinessUnit': 'XYZ'}).
Neither the tag keys nor the tag values will be modified by this module.
map(string) {} no
target_group_arns A list of aws_alb_target_group ARNs, for use with Application Load Balancing list(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
termination_policies A list of policies to decide how the instances in the auto scale group should be terminated. The allowed values are OldestInstance, NewestInstance, OldestLaunchConfiguration, ClosestToNextInstanceHour, Default list(string)
[
"Default"
]
no
use_custom_image_id If set to true, will use variable image_id for the EKS workers inside autoscaling group bool false no
use_existing_aws_iam_instance_profile If set to true, will use variable aws_iam_instance_profile_name to run EKS workers using an existing AWS instance profile that was created outside of this module, workaround for error like count cannot be computed bool false no
use_existing_security_group If set to true, will use variable workers_security_group_id to run EKS workers using an existing security group that was created outside of this module, workaround for errors like count cannot be computed bool false no
vpc_id VPC ID for the EKS cluster string n/a yes
wait_for_capacity_timeout A maximum duration that Terraform should wait for ASG instances to be healthy before timing out. Setting this to '0' causes Terraform to skip all Capacity Waiting behavior string "10m" no
wait_for_elb_capacity Setting this will cause Terraform to wait for exactly this number of healthy instances in all attached load balancers on both create and update operations. Takes precedence over min_elb_capacity behavior number 0 no
workers_role_policy_arns List of policy ARNs that will be attached to the workers default role on creation list(string) [] no
workers_role_policy_arns_count Count of 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
workers_security_group_id The name of the existing security group that will be used in autoscaling group for EKS workers. If empty, a new security group will be created string "" no

Outputs

Name Description
autoscaling_group_arn ARN of the AutoScaling Group
autoscaling_group_default_cooldown Time between a scaling activity and the succeeding scaling activity
autoscaling_group_desired_capacity The number of Amazon EC2 instances that should be running in the group
autoscaling_group_health_check_grace_period Time after instance comes into service before checking health
autoscaling_group_health_check_type EC2 or ELB. Controls how health checking is done
autoscaling_group_id The AutoScaling Group ID
autoscaling_group_max_size The maximum size of the AutoScaling Group
autoscaling_group_min_size The minimum size of the AutoScaling Group
autoscaling_group_name The AutoScaling Group name
autoscaling_group_tags A list of tag settings associated with the AutoScaling Group
launch_template_arn ARN of the launch template
launch_template_id The ID of the launch template
security_group_arn ARN of the worker nodes Security Group
security_group_id ID of the worker nodes Security Group
security_group_name Name of the worker nodes Security Group
workers_role_arn ARN of the worker nodes IAM role
workers_role_name Name of the worker nodes IAM role

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License

Preamble to the Apache License, Version 2.0

Complete license is available in the LICENSE file.

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