Ignore changes to desired_size of node_groups (#691)

* Ignore changes to desired_size of node_groups

Resolves #681

* Update CHANGELOG.md

Author: davidalger

CHANGELOG.md

@@ -12,6 +12,7 @@ project adheres to [Semantic Versioning](http://semver.org/).
 - Write your awesome change here (by @you)
 - Fix index reference on destroy for output `oidc_provider_arn` (@stevie-)
 - Add support for restricting access to the public API endpoint (@sidprak)
+- Add an `ignore_lifecycle` rule to prevent Terraform from scaling down ASG behind AWS EKS Managed Node Group (by @davidalger)
 
 # History
 

modules/node_groups/node_groups.tf

@@ -45,5 +45,6 @@ resource "aws_eks_node_group" "workers" {
 
   lifecycle {
     create_before_destroy = true
+    ignore_changes        = [scaling_config.0.desired_size]
   }
 }