Module: eks-cluster

Terraform module to provision an EKS cluster on AWS.

This Terraform module provisions a fully-configured AWS [EKS](https://aws.amazon.com/eks/) (Elastic Kubernetes Service) cluster. It's engineered to integrate smoothly with [Karpenter](https://karpenter.sh/) and [EKS addons](https://docs.aws.amazon.com/eks/latest/userguide/eks-add-ons.html), forming a critical part of [Cloud Posse's reference architecture](https://cloudposse.com/reference-architecture). Ideal for teams looking to deploy scalable and manageable Kubernetes clusters on AWS with minimal fuss.

Introduction

The module provisions the following resources:

• EKS cluster of master nodes that can be used together with the terraform-aws-eks-node-group and terraform-aws-eks-fargate-profile modules to create a full-blown EKS/Kubernetes cluster. You can also use the terraform-aws-eks-workers module to provision worker nodes for the cluster, but it is now rare for that to be a better choice than to use terraform-aws-eks-node-group.
• IAM Role to allow the cluster to access other AWS services
• EKS access entries to allow IAM users to access and administer the cluster

Usage

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/src.

Other examples:

• terraform-aws-components/eks/cluster - Cloud Posse's service catalog of "root module" invocations for provisioning reference architectures

  provider "aws" {
    region = var.region
  }

  # Note: This example creates an explicit access entry for the current user,
  # but in practice, you should use a static map of IAM users or roles that should have access to the cluster.
  # Granting access to the current user in this way is not recommended for production use.
  data "aws_caller_identity" "current" {}
  
  # IAM session context converts an assumed role ARN into an IAM Role ARN.
  # Again, this is primarily to simplify the example, and in practice, you should use a static map of IAM users or roles.
  data "aws_iam_session_context" "current" {
    arn = data.aws_caller_identity.current.arn
  }
  
  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://aws.amazon.com/premiumsupport/knowledge-center/eks-vpc-subnet-discovery/
    # https://github.com/kubernetes-sigs/aws-load-balancer-controller/blob/main/docs/deploy/subnet_discovery.md
    tags = { "kubernetes.io/cluster/${module.label.id}" = "shared" }
  
    # required tags to make ALB ingress work https://docs.aws.amazon.com/eks/latest/userguide/alb-ingress.html
    public_subnets_additional_tags = {
      "kubernetes.io/role/elb" : 1
    }
    private_subnets_additional_tags = {
      "kubernetes.io/role/internal-elb" : 1
    }
  
    # Enable the IAM user creating the cluster to administer it,
    # without using the bootstrap_cluster_creator_admin_permissions option,
    # as an example of how to use the access_entry_map feature.
    # In practice, this should be replaced with a static map of IAM users or roles
    # that should have access to the cluster, but we use the current user
    # to simplify the example.
    access_entry_map = {
      (data.aws_iam_session_context.current.issuer_arn) = {
        access_policy_associations = {
          ClusterAdmin = {}
        }
      }
    }
  }

  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
    tags       = var.tags
  }

  module "vpc" {
    source = "cloudposse/vpc/aws"
    # Cloud Posse recommends pinning every module to a specific version
    # version     = "x.x.x"

    ipv4_primary_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]
    ipv4_cidr_block      = [module.vpc.vpc_cidr_block]
    nat_gateway_enabled  = true
    nat_instance_enabled = false

    public_subnets_additional_tags  = local.public_subnets_additional_tags
    private_subnets_additional_tags = local.private_subnets_additional_tags

    tags    = local.tags
    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.private_subnet_ids
    health_check_type = var.health_check_type
    min_size          = var.min_size
    max_size          = var.max_size
    cluster_name      = module.eks_cluster.eks_cluster_id

    # Enable the Kubernetes cluster auto-scaler to find the auto-scaling group
    cluster_autoscaler_enabled = var.autoscaling_policies_enabled

    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"

    subnet_ids            = concat(module.subnets.private_subnet_ids, module.subnets.public_subnet_ids)
    kubernetes_version    = var.kubernetes_version
    oidc_provider_enabled = true

    addons = [
      # https://docs.aws.amazon.com/eks/latest/userguide/managing-vpc-cni.html#vpc-cni-latest-available-version
      {
        addon_name                  = "vpc-cni"
        addon_version               = var.vpc_cni_version
        resolve_conflicts_on_create = "OVERWRITE"
        resolve_conflicts_on_update = "OVERWRITE"
        service_account_role_arn    = var.vpc_cni_service_account_role_arn # Creating this role is outside the scope of this example
      },
      # https://docs.aws.amazon.com/eks/latest/userguide/managing-kube-proxy.html
      {
        addon_name                  = "kube-proxy"
        addon_version               = var.kube_proxy_version
        resolve_conflicts_on_create = "OVERWRITE"
        resolve_conflicts_on_update = "OVERWRITE"
        service_account_role_arn    = null
      },
      # https://docs.aws.amazon.com/eks/latest/userguide/managing-coredns.html
      {
        addon_name                  = "coredns"
        addon_version               = var.coredns_version
        resolve_conflicts_on_create = "OVERWRITE"
        resolve_conflicts_on_update = "OVERWRITE"
        service_account_role_arn    = null
      },
    ]
    addons_depends_on = [module.eks_node_group]

    context = module.label.context

    cluster_depends_on = [module.subnets]
  }

Module usage with two unmanaged worker groups:

  locals {
    # Unfortunately, the `aws_ami` data source attribute `most_recent` (https://github.com/cloudposse/terraform-aws-eks-workers/blob/34a43c25624a6efb3ba5d2770a601d7cb3c0d391/main.tf#L141)
    # does not work as you might expect. If you are not going to use a custom AMI you should
    # use the `eks_worker_ami_name_filter` variable to set the right kubernetes version for EKS workers,
    # otherwise the first version of Kubernetes supported by AWS (v1.11) for EKS workers will be selected, but the
    # EKS control plane will ignore it to use one that matches the version specified by the `kubernetes_version` variable.
    eks_worker_ami_name_filter = "amazon-eks-node-${var.kubernetes_version}*"
  }

  module "eks_workers" {
    source = "cloudposse/eks-workers/aws"
    # Cloud Posse recommends pinning every module to a specific version
    # version     = "x.x.x"

    attributes                         = ["small"]
    instance_type                      = "t3.small"
    eks_worker_ami_name_filter         = local.eks_worker_ami_name_filter
    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                       = module.label.id
    cluster_endpoint                   = module.eks_cluster.eks_cluster_endpoint
    cluster_certificate_authority_data = module.eks_cluster.eks_cluster_certificate_authority_data
    cluster_security_group_id          = module.eks_cluster.eks_cluster_managed_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

    context = module.label.context
  }

  module "eks_workers_2" {
    source = "cloudposse/eks-workers/aws"
    # Cloud Posse recommends pinning every module to a specific version
    # version     = "x.x.x"

    attributes                         = ["medium"]
    instance_type                      = "t3.medium"
    eks_worker_ami_name_filter         = local.eks_worker_ami_name_filter
    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                       = module.label.id
    cluster_endpoint                   = module.eks_cluster.eks_cluster_endpoint
    cluster_certificate_authority_data = module.eks_cluster.eks_cluster_certificate_authority_data
    cluster_security_group_id          = module.eks_cluster.eks_cluster_managed_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

    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"

    subnet_ids            = concat(module.subnets.private_subnet_ids, module.subnets.public_subnet_ids)
    kubernetes_version    = var.kubernetes_version
    oidc_provider_enabled = true # needed for VPC CNI

    access_entries_for_nodes = {
      EC2_LINUX = [module.eks_workers.workers_role_arn, module.eks_workers_2.workers_role_arn]
    }

    context = module.label.context
  }

[!WARNING] Release 4.0.0 contains major breaking changes that will require you to update your existing EKS cluster and configuration to use this module. Please see the v3 to v4 migration path for more information. Release 2.0.0 (previously released as version 0.45.0) contains some changes that, if applied to a cluster created with an earlier version of this module, could result in your existing EKS cluster being replaced (destroyed and recreated). To prevent this, follow the instructions in the v1 to v2 migration path.

[!NOTE] Prior to v4 of this module, AWS did not provide an API to manage access to the EKS cluster, causing numerous challenges. With v4 of this module, it exclusively uses the AWS API, resolving many issues you may read about that had affected prior versions. See the version 2 README and release notes for more information on the challenges and workarounds that were required prior to v3.

Requirements

Name	Version
terraform	>= 1.3.0
aws	>= 5.34.0
tls	>= 3.1.0, != 4.0.0

Providers

Name	Version
aws	>= 5.34.0
tls	>= 3.1.0, != 4.0.0

Modules

Name	Source	Version
label	cloudposse/label/null	0.25.0
this	cloudposse/label/null	0.25.0

Resources

Name	Type
aws_cloudwatch_log_group.default	resource
aws_eks_access_entry.linux	resource
aws_eks_access_entry.map	resource
aws_eks_access_entry.standard	resource
aws_eks_access_entry.windows	resource
aws_eks_access_policy_association.list	resource
aws_eks_access_policy_association.map	resource
aws_eks_addon.cluster	resource
aws_eks_cluster.default	resource
aws_iam_openid_connect_provider.default	resource
aws_iam_policy.cluster_elb_service_role	resource
aws_iam_role.default	resource
aws_iam_role_policy_attachment.amazon_eks_cluster_policy	resource
aws_iam_role_policy_attachment.amazon_eks_service_policy	resource
aws_iam_role_policy_attachment.cluster_elb_service_role	resource
aws_kms_alias.cluster	resource
aws_kms_key.cluster	resource
aws_vpc_security_group_ingress_rule.custom_ingress_rules	resource
aws_vpc_security_group_ingress_rule.managed_ingress_cidr_blocks	resource
aws_vpc_security_group_ingress_rule.managed_ingress_security_groups	resource
aws_iam_policy_document.assume_role	data source
aws_iam_policy_document.cluster_elb_service_role	data source
aws_partition.current	data source
tls_certificate.cluster	data source

Inputs

Name	Description	Type	Default	Required
access_config	Access configuration for the EKS cluster.	object({ authentication_mode = optional(string, "API") bootstrap_cluster_creator_admin_permissions = optional(bool, false) })	{}	no
access_entries	List of IAM principles to allow to access the EKS cluster. It is recommended to use the default user_name because the default includes the IAM role or user name and the session name for assumed roles. Use when Principal ARN is not known at plan time.	list(object({ principal_arn = string user_name = optional(string, null) kubernetes_groups = optional(list(string), null) }))	[]	no
access_entries_for_nodes	Map of list of IAM roles for the EKS non-managed worker nodes. The map key is the node type, either EC2_LINUX or EC2_WINDOWS, and the list contains the IAM roles of the nodes of that type. There is no need for or utility in creating Fargate access entries, as those are always created automatically by AWS, just as with managed nodes. Use when Principal ARN is not known at plan time.	map(list(string))	{}	no
access_entry_map	Map of IAM Principal ARNs to access configuration. Preferred over other inputs as this configuration remains stable when elements are added or removed, but it requires that the Principal ARNs and Policy ARNs are known at plan time. Can be used along with other access_* inputs, but do not duplicate entries. Map access_policy_associations keys are policy ARNs, policy full name (AmazonEKSViewPolicy), or short name (View). It is recommended to use the default user_name because the default includes IAM role or user name and the session name for assumed roles. As a special case in support of backwards compatibility, membership in the system:masters group is is translated to an association with the ClusterAdmin policy. In all other cases, including any system:* group in kubernetes_groups is prohibited.	map(object({ # key is principal_arn user_name = optional(string) # Cannot assign "system:*" groups to IAM users, use ClusterAdmin and Admin instead kubernetes_groups = optional(list(string), []) type = optional(string, "STANDARD") access_policy_associations = optional(map(object({ # key is policy_arn or policy_name access_scope = optional(object({ type = optional(string, "cluster") namespaces = optional(list(string)) }), {}) # access_scope })), {}) # access_policy_associations }))	{}	no
access_policy_associations	List of AWS managed EKS access policies to associate with IAM principles. Use when Principal ARN or Policy ARN is not known at plan time. policy_arn can be the full ARN, the full name (AmazonEKSViewPolicy) or short name (View).	list(object({ principal_arn = string policy_arn = string access_scope = object({ type = optional(string, "cluster") namespaces = optional(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
addons	Manages aws_eks_addon resources. Note: resolve_conflicts is deprecated. If resolve_conflicts is set and resolve_conflicts_on_create or resolve_conflicts_on_update is not set, resolve_conflicts will be used instead. If resolve_conflicts_on_create is not set and resolve_conflicts is PRESERVE, resolve_conflicts_on_create will be set to NONE.	list(object({ addon_name = string addon_version = optional(string, null) configuration_values = optional(string, null) # resolve_conflicts is deprecated, but we keep it for backwards compatibility # and because if not declared, Terraform will silently ignore it. resolve_conflicts = optional(string, null) resolve_conflicts_on_create = optional(string, null) resolve_conflicts_on_update = optional(string, null) service_account_role_arn = optional(string, null) create_timeout = optional(string, null) update_timeout = optional(string, null) delete_timeout = optional(string, null) }))	[]	no
addons_depends_on	If provided, all addons will depend on this object, and therefore not be installed until this object is finalized. This is useful if you want to ensure that addons are not applied before some other condition is met, e.g. node groups are created. See issue #170 for more details.	any	null	no
allowed_cidr_blocks	A list of IPv4 CIDRs to allow access to the cluster. The length of this list must be known at "plan" time.	list(string)	[]	no
allowed_security_group_ids	A list of IDs of Security Groups to allow access to the cluster.	list(string)	[]	no
associated_security_group_ids	A list of IDs of Security Groups to associate the cluster with. 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
cloudwatch_log_group_kms_key_id	If provided, the KMS Key ID to use to encrypt AWS CloudWatch logs	string	null	no
cluster_attributes	Override label module default cluster attributes	list(string)	[ "cluster" ]	no
cluster_depends_on	If provided, the EKS will depend on this object, and therefore not be created until this object is finalized. This is useful if you want to ensure that the cluster is not created before some other condition is met, e.g. VPNs into the subnet are created.	any	null	no
cluster_encryption_config_enabled	Set to true to enable Cluster Encryption Configuration	bool	true	no
cluster_encryption_config_kms_key_deletion_window_in_days	Cluster Encryption Config KMS Key Resource argument - key deletion windows in days post destruction	number	10	no
cluster_encryption_config_kms_key_enable_key_rotation	Cluster Encryption Config KMS Key Resource argument - enable kms key rotation	bool	true	no
cluster_encryption_config_kms_key_id	KMS Key ID to use for cluster encryption config	string	""	no
cluster_encryption_config_kms_key_policy	Cluster Encryption Config KMS Key Resource argument - key policy	string	null	no
cluster_encryption_config_resources	Cluster Encryption Config Resources to encrypt, e.g. ['secrets']	list(any)	[ "secrets" ]	no
cluster_log_retention_period	Number of days to retain cluster logs. Requires enabled_cluster_log_types to be set. See https://docs.aws.amazon.com/en_us/eks/latest/userguide/control-plane-logs.html.	number	0	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
create_eks_service_role	Set false to use existing eks_cluster_service_role_arn instead of creating one	bool	true	no
custom_ingress_rules	A List of Objects, which are custom security group rules that	list(object({ description = string from_port = number to_port = number protocol = string source_security_group_id = string }))	[]	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
eks_cluster_service_role_arn	The ARN of an IAM role for the EKS cluster to use that provides permissions for the Kubernetes control plane to perform needed AWS API operations. Required if create_eks_service_role is false, ignored otherwise.	string	null	no
enabled	Set to false to prevent the module from creating any resources	bool	null	no
enabled_cluster_log_types	A list of the desired control plane logging to enable. For more information, see https://docs.aws.amazon.com/en_us/eks/latest/userguide/control-plane-logs.html. Possible values [api, audit, authenticator, controllerManager, scheduler]	list(string)	[]	no
endpoint_private_access	Indicates whether or not the Amazon EKS private API server endpoint is enabled. Default to AWS EKS resource and it is false	bool	false	no
endpoint_public_access	Indicates whether or not the Amazon EKS public API server endpoint is enabled. Default to AWS EKS resource and it is true	bool	true	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
kubernetes_network_ipv6_enabled	Set true to use IPv6 addresses for Kubernetes pods and services	bool	false	no
kubernetes_version	Desired Kubernetes master version. If you do not specify a value, the latest available version is used	string	"1.21"	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
managed_security_group_rules_enabled	Flag to enable/disable the ingress and egress rules for the EKS managed Security Group	bool	true	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
oidc_provider_enabled	Create an IAM OIDC identity provider for the cluster, then you can create IAM roles to associate with a service account in the cluster, instead of using kiam or kube2iam. For more information, see EKS User Guide.	bool	false	no
permissions_boundary	If provided, all IAM roles will be created with this permissions boundary attached	string	null	no
public_access_cidrs	Indicates which CIDR blocks can access the Amazon EKS public API server endpoint when enabled. EKS defaults this to a list with 0.0.0.0/0.	list(string)	[ "0.0.0.0/0" ]	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
region	OBSOLETE (not needed): AWS Region	string	null	no
service_ipv4_cidr	The CIDR block to assign Kubernetes service IP addresses from. You can only specify a custom CIDR block when you create a cluster, changing this value will force a new cluster to be created.	string	null	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 the cluster 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

Outputs

Name	Description
cloudwatch_log_group_kms_key_id	KMS Key ID to encrypt AWS CloudWatch logs
cloudwatch_log_group_name	The name of the log group created in cloudwatch where cluster logs are forwarded to if enabled
cluster_encryption_config_enabled	If true, Cluster Encryption Configuration is enabled
cluster_encryption_config_provider_key_alias	Cluster Encryption Config KMS Key Alias ARN
cluster_encryption_config_provider_key_arn	Cluster Encryption Config KMS Key ARN
cluster_encryption_config_resources	Cluster Encryption Config Resources
eks_addons_versions	Map of enabled EKS Addons names and versions
eks_cluster_arn	The Amazon Resource Name (ARN) of the cluster
eks_cluster_certificate_authority_data	The Kubernetes cluster certificate authority data
eks_cluster_endpoint	The endpoint for the Kubernetes API server
eks_cluster_id	The name of the cluster
eks_cluster_identity_oidc_issuer	The OIDC Identity issuer for the cluster
eks_cluster_identity_oidc_issuer_arn	The OIDC Identity issuer ARN for the cluster that can be used to associate IAM roles with a service account
eks_cluster_ipv6_service_cidr	The IPv6 CIDR block that Kubernetes pod and service IP addresses are assigned from if kubernetes_network_ipv6_enabled is set to true. If set to false this output will be null.
eks_cluster_managed_security_group_id	Security Group ID that was created by EKS for the cluster. EKS creates a Security Group and applies it to the ENI that are attached to EKS Control Plane master nodes and to any managed workloads.
eks_cluster_role_arn	ARN of the EKS cluster IAM role
eks_cluster_version	The Kubernetes server version of the cluster