Add option to change worker placement_tenancy. (#142)

* Add option to change worker placement_tenancy.

* update CHANGELOG.md

Author: monsterxx03

CHANGELOG.md

@@ -12,6 +12,7 @@ project adheres to [Semantic Versioning](http://semver.org/).
 - A useful addition (slam dunk, @self 🔥)
 - Worker groups can be created with a specified IAM profile. (from @laverya)
 - exposed `aws_eks_cluster` create and destroy timeouts (by @RGPosadas)
+- exposed `placement_tenancy` for autoscaling group (by @monsterxx03)
 - Allow port 443 from EKS service to nodes to run `metrics-server`. (by @max-rocket-internet)
 
 ### Changed

local.tf

@@ -17,6 +17,7 @@ locals {
     asg_min_size                  = "1"                             # Minimum worker capacity in the autoscaling group.
     instance_type                 = "m4.large"                      # Size of the workers instances.
     spot_price                    = ""                              # Cost of spot instance.
+    placement_tenancy             = ""                              # The tenancy of the instance. Valid values are "default" or "dedicated".
     root_volume_size              = "100"                           # root volume size of workers instances.
     root_volume_type              = "gp2"                           # root volume type of workers instances, can be 'standard', 'gp2', or 'io1'
     root_iops                     = "0"                             # The amount of provisioned IOPS. This must be set with a volume_type of "io1".

workers.tf

@@ -34,6 +34,7 @@ resource "aws_launch_configuration" "workers" {
   ebs_optimized               = "${lookup(var.worker_groups[count.index], "ebs_optimized", lookup(local.ebs_optimized, lookup(var.worker_groups[count.index], "instance_type", local.workers_group_defaults["instance_type"]), false))}"
   enable_monitoring           = "${lookup(var.worker_groups[count.index], "enable_monitoring", local.workers_group_defaults["enable_monitoring"])}"
   spot_price                  = "${lookup(var.worker_groups[count.index], "spot_price", local.workers_group_defaults["spot_price"])}"
+  placement_tenancy           = "${lookup(var.worker_groups[count.index], "placement_tenancy", local.workers_group_defaults["placement_tenancy"])}"
   count                       = "${var.worker_group_count}"
 
   lifecycle {