terraform.aws-baseline-infra/examples/eks-managed-nodegroup/main.tf

provider "kubernetes" {
  host                   = module.eks.cluster_endpoint
  cluster_ca_certificate = base64decode(module.eks.cluster_certificate_authority_data)

  exec {
    api_version = "client.authentication.k8s.io/v1beta1"
    command     = "aws"
    # This requires the awscli to be installed locally where Terraform is executed
    args = ["eks", "get-token", "--cluster-name", module.eks.cluster_name]
  }
}

module "eks" {
  source  = "terraform-aws-modules/eks/aws"
  version = "19.21.0"

  cluster_name                   = "lab-ken2026-eks01"
  cluster_endpoint_public_access = true
  cluster_version                = "1.27"

  cluster_addons = {
    coredns = {
      preserve    = true
      most_recent = true

      timeouts = {
        create = "25m"
        delete = "10m"
      }
    }
    kube-proxy = {
      most_recent = true
    }
    vpc-cni = {
      most_recent = true
    }
  }

  create_kms_key = false
  cluster_encryption_config = {
    resources        = ["secrets"]
    provider_key_arn = module.kms.key_arn
  }

  iam_role_additional_policies = {
    additional = aws_iam_policy.additional.arn
  }

  vpc_id                   = var.vpc_id
  subnet_ids               = var.subnet_ids
  control_plane_subnet_ids = var.control_plane_subnet_ids

  # Extend cluster security group rules
  cluster_security_group_additional_rules = {
    ingress_nodes_ephemeral_ports_tcp = {
      description                = "Nodes on ephemeral ports"
      protocol                   = "tcp"
      from_port                  = 1025
      to_port                    = 65535
      type                       = "ingress"
      source_node_security_group = true
    }
    # Test: https://github.com/terraform-aws-modules/terraform-aws-eks/pull/2319
    ingress_source_security_group_id = {
      description              = "Ingress from another computed security group"
      protocol                 = "tcp"
      from_port                = 22
      to_port                  = 22
      type                     = "ingress"
      source_security_group_id = aws_security_group.additional.id
    }
  }

  # requires terraform be ran inside VPC
#    manage_aws_auth_configmap = true
#
#    aws_auth_roles = [
#      {
#        rolearn  = module.eks_managed_node_group.iam_role_arn
#        username = "system:node:{{EC2PrivateDNSName}}"
#        groups = [
#          "system:bootstrappers",
#          "system:nodes",
#        ]
#      },
#      {
#        rolearn  = "arn:aws:iam::040216112220:role/rackLE"
#        username = "rackLE"
#        groups   = ["system:masters"]
#      }
#    ]
#
#    aws_auth_users = [
#      {
#        userarn  = var.eks_master_user_arn
#        username = "eksmaster"
#        groups   = ["system:masters"]
#      }
#    ]
#
#    aws_auth_accounts = [
#      data.aws_caller_identity.current.account_id
#    ]

}

module "eks_managed_node_group" {
  source  = "terraform-aws-modules/eks/aws//modules/eks-managed-node-group"
  version = "19.21.0"

  name            = "eks-mng"
  cluster_name    = module.eks.cluster_name
  cluster_version = module.eks.cluster_version

  subnet_ids                        = var.subnet_ids
  cluster_primary_security_group_id = module.eks.cluster_primary_security_group_id
  vpc_security_group_ids = [
    module.eks.cluster_security_group_id,
    aws_security_group.additional.id
  ]

  ami_type       = "AL2_x86_64"
  instance_types = ["t3.medium"]
  iam_role_additional_policies = {
    SsmInstanceCore = "arn:aws:iam::aws:policy/AmazonSSMManagedInstanceCore"
  }

  # this will get added to what AWS provides
  bootstrap_extra_args = <<-EOT
    # extra args added
    [settings.kernel]
    lockdown = "integrity"

    [settings.kubernetes.node-labels]
    "label1" = "foo"
    "label2" = "bar"
  EOT

  min_size     = 0
  desired_size = 1
  max_size     = 2
}


module "kms" {
  source  = "terraform-aws-modules/kms/aws"
  version = "~> 1.5"

  aliases               = ["eks/${local.resource-prefix}"]
  description           = "${local.resource-prefix} cluster encryption key"
  enable_default_policy = true
  key_owners            = [data.aws_caller_identity.current.arn]
}

resource "aws_security_group" "additional" {
  name_prefix = "${local.resource-prefix}-sg"
  vpc_id      = var.vpc_id

  ingress {
    from_port = 22
    to_port   = 22
    protocol  = "tcp"
    cidr_blocks = [
      "10.0.0.0/8",
      "172.16.0.0/12",
      "192.168.0.0/16",
    ]
  }
}

resource "aws_iam_policy" "additional" {
  name = "${local.resource-prefix}-policy"

  policy = jsonencode({
    Version = "2012-10-17"
    Statement = [
      {
        Action = [
          "ec2:Describe*",
        ]
        Effect   = "Allow"
        Resource = "*"
      },
    ]
  })
}


data "aws_caller_identity" "current" {}