added the ability to optionally specify worker_image_id

CHANGELOG.md

@@ -5,9 +5,22 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/) and this
 project adheres to [Semantic Versioning](http://semver.org/).
 
+## [[v0.2.0](https://github.com/terraform-aws-modules/terraform-aws-eks/compare/v0.1.1...v0.2.0)] - 2018-06-08]
+
+### Changed
+
+- `worker_ami_id` is now made optional. If not specified, the module will source the latest AWS supported EKS AMI instead.
+
+## [[v0.1.1](https://github.com/terraform-aws-modules/terraform-aws-eks/compare/v0.1.0...v0.1.1)] - 2018-06-07]
+
+### Changed
+
+- pre-commit hooks fixed and working.
+- made progress on CI, advancing the build to the final `kitchen test` stage before failing.
+
 ## [v0.1.0] - 2018-06-07
 
 ### Added
 
 - Everything! Initial release of the module.
-- Kudos to @tanmng for finding and fixing bug #1.
+- added a local variable to do a lookup against for a dynamic value in userdata which was previously static. Kudos to @tanmng for finding and fixing bug #1!

README.md

@@ -89,15 +89,15 @@ MIT Licensed. See [LICENSE](https://github.com/terraform-aws-modules/terraform-a
 | Name | Description | Type | Default | Required |
 |------|-------------|:----:|:-----:|:-----:|
 | cluster_ingress_cidrs | The CIDRs from which we can execute kubectl commands. | list | - | yes |
-| cluster_name | Name of the EKS cluster. | string | - | yes |
+| cluster_name | Name of the EKS cluster which is also used as a prefix in names of related resources. | string | - | yes |
 | cluster_version | Kubernetes version to use for the cluster. | string | `1.10` | no |
 | subnets | A list of subnets to associate with the cluster's underlying instances. | list | - | yes |
-| tags | A map of tags to add to all resources | string | `<map>` | no |
+| tags | A map of tags to add to all resources. | string | `<map>` | no |
 | vpc_id | VPC id where the cluster and other resources will be deployed. | string | - | yes |
-| workers_ami_id | AMI ID for the eks workers. | string | - | yes |
-| workers_asg_desired_capacity | description | string | `1` | no |
-| workers_asg_max_size | description | string | `3` | no |
-| workers_asg_min_size | description | string | `1` | no |
+| workers_ami_id | AMI ID for the eks workers. If none is provided, Terraform will search for the latest version of their EKS optimized worker AMI. | string | `` | no |
+| workers_asg_desired_capacity | Desired worker capacity in the autoscaling group. | string | `1` | no |
+| workers_asg_max_size | Maximum worker capacity in the autoscaling group. | string | `3` | no |
+| workers_asg_min_size | Minimum worker capacity in the autoscaling group. | string | `1` | no |
 | workers_instance_type | Size of the workers instances. | string | `m4.large` | no |
 
 ## Outputs

data.tf

@@ -1,5 +1,15 @@
 data "aws_region" "current" {}
 
+data "aws_ami" "eks_worker" {
+  filter {
+    name   = "name"
+    values = ["eks-worker-*"]
+  }
+
+  most_recent = true
+  owners      = ["602401143452"] # Amazon
+}
+
 data "aws_iam_policy_document" "workers_assume_role_policy" {
   statement {
     sid = "EKSWorkerAssumeRole"

examples/eks_test_fixture/main.tf

@@ -14,16 +14,6 @@ provider "random" {
 provider "http" {}
 provider "local" {}
 
-data "aws_ami" "eks_worker" {
-  filter {
-    name   = "name"
-    values = ["eks-worker-*"]
-  }
-
-  most_recent = true
-  owners      = ["602401143452"] # Amazon
-}
-
 data "aws_availability_zones" "available" {}
 
 data "http" "workstation_external_ip" {
@@ -75,7 +65,6 @@ module "eks" {
   subnets               = "${module.vpc.public_subnets}"
   tags                  = "${local.tags}"
   vpc_id                = "${module.vpc.vpc_id}"
-  workers_ami_id        = "${data.aws_ami.eks_worker.id}"
   cluster_ingress_cidrs = ["${local.workstation_external_cidr}"]
   workers_instance_type = "t2.small"
 }

variables.tf

@@ -4,7 +4,7 @@ variable "cluster_ingress_cidrs" {
 }
 
 variable "cluster_name" {
-  description = "Name of the EKS cluster."
+  description = "Name of the EKS cluster which is also used as a prefix in names of related resources."
 }
 
 variable "cluster_version" {
@@ -18,7 +18,7 @@ variable "subnets" {
 }
 
 variable "tags" {
-  description = "A map of tags to add to all resources"
+  description = "A map of tags to add to all resources."
   default     = {}
 }
 
@@ -27,21 +27,22 @@ variable "vpc_id" {
 }
 
 variable "workers_ami_id" {
-  description = "AMI ID for the eks workers."
+  description = "AMI ID for the eks workers. If none is provided, Terraform will search for the latest version of their EKS optimized worker AMI."
+  default     = ""
 }
 
 variable "workers_asg_desired_capacity" {
-  description = "description"
+  description = "Desired worker capacity in the autoscaling group."
   default     = "1"
 }
 
 variable "workers_asg_max_size" {
-  description = "description"
+  description = "Maximum worker capacity in the autoscaling group."
   default     = "3"
 }
 
 variable "workers_asg_min_size" {
-  description = "description"
+  description = "Minimum worker capacity in the autoscaling group."
   default     = "1"
 }
 

version

@@ -1 +1 @@
-v0.1.1
+v0.2.0

workers.tf

@@ -19,7 +19,7 @@ resource "aws_launch_configuration" "workers" {
   associate_public_ip_address = true
   name_prefix                 = "${var.cluster_name}"
   iam_instance_profile        = "${aws_iam_instance_profile.workers.name}"
-  image_id                    = "${var.workers_ami_id}"
+  image_id                    = "${var.workers_ami_id == "" ? data.aws_ami.eks_worker.id : var.workers_ami_id}"
   instance_type               = "${var.workers_instance_type}"
   security_groups             = ["${aws_security_group.workers.id}"]
   user_data_base64            = "${base64encode(local.workers_userdata)}"