ebs optimization of instances now possible

CHANGELOG.md

@@ -13,6 +13,7 @@ project adheres to [Semantic Versioning](http://semver.org/).
 - `workers_ami_id` is now made optional. If not specified, the module will source the latest AWS supported EKS AMI instead.
 - added ability to specify extra userdata code to execute after the second to configure and start kube services.
 - When `configure_kubectl_session` is set to true the current shell will be configured to talk to the kubernetes cluster using config files output from the module.
+- EBS optimization used whenever possible for the given instance type.
 
 ## [[v0.1.1](https://github.com/terraform-aws-modules/terraform-aws-eks/compare/v0.1.0...v0.1.1)] - 2018-06-07]
 

data.tf

@@ -71,3 +71,8 @@ data template_file config_map_aws_auth {
     role_arn = "${aws_iam_role.workers.arn}"
   }
 }
+
+module "ebs_optimized" {
+  source        = "modules/util/ebs_optimized/"
+  instance_type = "${var.workers_instance_type}"
+}

examples/eks_test_fixture/README.md

@@ -6,19 +6,6 @@ This set of templates serves a few purposes. It:
 2.  serves as the test infrastructure for CI on the project.
 3.  provides a simple way to play with the Kubernetes cluster you create.
 
-## testing with kubectl
-
-Once converged, `kubeconfig` and `config-map-aws-auth.yml` should be in this directory.
-Ensure you have a recent version of `kubectl` on your PATH ([instructions here](https://kubernetes.io/docs/tasks/tools/install-kubectl/#install-kubectl))
-
-```bash
-curl -o heptio-authenticator-aws https://amazon-eks.s3-us-west-2.amazonaws.com/1.10.3/2018-06-05/bin/darwin/amd64/heptio-authenticator-aws
-mv heptio-authenticator-aws ~/go/bin/
-kubectl apply -f examples/eks_test_fixture/config-map-aws-auth.yaml --kubeconfig examples/eks_test_fixture/kubeconfig
-# configmap "aws-auth" created
-kubectl get nodes --watch --kubeconfig examples/eks_test_fixture/kubeconfig
-```
-
 ## IAM Permissions
 
 The following IAM policy is the minimum needed to execute the module from the test suite.

modules/util/ebs_optimized/main.tf

@@ -0,0 +1,114 @@
+/**
+# terraform_util_ebs_optimized
+
+A terraform module to return true or false based on if an instance type supports the EBS optmized flag.
+*/
+
+locals {
+  ebs_optimized_types = {
+    "c4.large"     = true
+    "c4.xlarge"    = true
+    "c4.2xlarge"   = true
+    "c4.4xlarge"   = true
+    "c4.8xlarge"   = true
+    "c5.large"     = true
+    "c5.xlarge"    = true
+    "c5.2xlarge"   = true
+    "c5.4xlarge"   = true
+    "c5.9xlarge"   = true
+    "c5.18xlarge"  = true
+    "c5d.large"    = true
+    "c5d.xlarge"   = true
+    "c5d.2xlarge"  = true
+    "c5d.4xlarge"  = true
+    "c5d.9xlarge"  = true
+    "c5d.18xlarge" = true
+    "d2.xlarge"    = true
+    "d2.2xlarge"   = true
+    "d2.4xlarge"   = true
+    "d2.8xlarge"   = true
+    "f1.2xlarge"   = true
+    "f1.16xlarge"  = true
+    "g3.4xlarge"   = true
+    "g3.8xlarge"   = true
+    "g3.16xlarge"  = true
+    "h1.2xlarge"   = true
+    "h1.4xlarge"   = true
+    "h1.8xlarge"   = true
+    "h1.16xlarge"  = true
+    "i3.large"     = true
+    "i3.xlarge"    = true
+    "i3.2xlarge"   = true
+    "i3.4xlarge"   = true
+    "i3.8xlarge"   = true
+    "i3.16xlarge"  = true
+    "i3.metal"     = true
+    "m4.large"     = true
+    "m4.xlarge"    = true
+    "m4.2xlarge"   = true
+    "m4.4xlarge"   = true
+    "m4.10xlarge"  = true
+    "m4.16xlarge"  = true
+    "m5.large"     = true
+    "m5.xlarge"    = true
+    "m5.2xlarge"   = true
+    "m5.4xlarge"   = true
+    "m5.12xlarge"  = true
+    "m5.24xlarge"  = true
+    "m5d.large"    = true
+    "m5d.xlarge"   = true
+    "m5d.2xlarge"  = true
+    "m5d.4xlarge"  = true
+    "m5d.12xlarge" = true
+    "m5d.24xlarge" = true
+    "p2.xlarge"    = true
+    "p2.8xlarge"   = true
+    "p2.16xlarge"  = true
+    "p3.2xlarge"   = true
+    "p3.8xlarge"   = true
+    "p3.16xlarge"  = true
+    "r4.large"     = true
+    "r4.xlarge"    = true
+    "r4.2xlarge"   = true
+    "r4.4xlarge"   = true
+    "r4.8xlarge"   = true
+    "r4.16xlarge"  = true
+    "x1.16xlarge"  = true
+    "x1.32xlarge"  = true
+    "x1e.xlarge"   = true
+    "x1e.2xlarge"  = true
+    "x1e.4xlarge"  = true
+    "x1e.8xlarge"  = true
+    "x1e.16xlarge" = true
+    "x1e.32xlarge" = true
+    "c5.large"     = true
+    "c5.xlarge"    = true
+    "c5.2xlarge"   = true
+    "c5d.large"    = true
+    "c5d.xlarge"   = true
+    "c5d.2xlarge"  = true
+    "m5.large"     = true
+    "m5.xlarge"    = true
+    "m5.2xlarge"   = true
+    "m5d.large"    = true
+    "m5d.xlarge"   = true
+    "m5d.2xlarge"  = true
+    "c1.xlarge"    = true
+    "c3.xlarge"    = true
+    "c3.2xlarge"   = true
+    "c3.4xlarge"   = true
+    "g2.2xlarge"   = true
+    "i2.xlarge"    = true
+    "i2.2xlarge"   = true
+    "i2.4xlarge"   = true
+    "m1.large"     = true
+    "m1.xlarge"    = true
+    "m2.2xlarge"   = true
+    "m2.4xlarge"   = true
+    "m3.xlarge"    = true
+    "m3.2xlarge"   = true
+    "r3.xlarge"    = true
+    "r3.2xlarge"   = true
+    "r3.4xlarge"   = true
+  }
+}

modules/util/ebs_optimized/outputs.tf

@@ -0,0 +1,4 @@
+output "answer" {
+  description = "Returns true or false depending on if the instance type is able to be EBS optimized."
+  value       = "${lookup(local.ebs_optimized_types, var.instance_type, false)}"
+}

modules/util/ebs_optimized/variables.tf

@@ -0,0 +1,3 @@
+variable "instance_type" {
+  description = "Instance type to evaluate if EBS optimized is an option."
+}

variables.tf

@@ -27,6 +27,11 @@ variable "configure_kubectl_session" {
   default     = false
 }
 
+variable "ebs_optimized_workers" {
+  description = "If left at default of true, will use ebs optimization if available on the given instance type."
+  default     = true
+}
+
 variable "subnets" {
   description = "A list of subnets to associate with the cluster's underlying instances."
   type        = "list"

workers.tf

@@ -23,7 +23,7 @@ resource "aws_launch_configuration" "workers" {
   instance_type               = "${var.workers_instance_type}"
   security_groups             = ["${aws_security_group.workers.id}"]
   user_data_base64            = "${base64encode(data.template_file.userdata.rendered)}"
-  ebs_optimized               = false
+  ebs_optimized               = "${var.ebs_optimized_workers ? module.ebs_optimized.answer : false}"
 
   lifecycle {
     create_before_destroy = true