From b3a90aac807db10561cfa39cee15d161819e7877 Mon Sep 17 00:00:00 2001
From: David Alger <davidmalger@gmail.com>
Date: Fri, 17 Jan 2020 07:13:07 -0600
Subject: [PATCH] Ignore changes to desired_size of node_groups (#691)

* Ignore changes to desired_size of node_groups

Resolves #681

* Update CHANGELOG.md
---
 CHANGELOG.md                       | 1 +
 modules/node_groups/node_groups.tf | 1 +
 2 files changed, 2 insertions(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 890eea5..c1b8394 100644
--- a/CHANGELOG.md
+++ b/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
 
diff --git a/modules/node_groups/node_groups.tf b/modules/node_groups/node_groups.tf
index cdbc6d0..e42a4ee 100644
--- a/modules/node_groups/node_groups.tf
+++ b/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]
   }
 }