From e9fd7fceae8b47a10ed7503b38a8e91a741aae35 Mon Sep 17 00:00:00 2001
From: Robin-Manuel Thiel <robin-manuel@thiel1.de>
Date: Wed, 6 Dec 2023 17:21:47 +0100
Subject: [PATCH] Add Auto-Upgrades to AKS Template

---
 src/terraform-aks/templates/azure_aks.tf | 25 ++++++++++++++++++++++--
 1 file changed, 23 insertions(+), 2 deletions(-)

diff --git a/src/terraform-aks/templates/azure_aks.tf b/src/terraform-aks/templates/azure_aks.tf
index 3c03701..ab61616 100644
--- a/src/terraform-aks/templates/azure_aks.tf
+++ b/src/terraform-aks/templates/azure_aks.tf
@@ -3,9 +3,30 @@ resource "azurerm_kubernetes_cluster" "default" {
   location                  = azurerm_resource_group.default.location
   resource_group_name       = azurerm_resource_group.default.name
   dns_prefix                = "${local.prefix}aks"
-  kubernetes_version        = var.kubernetes_version
-  automatic_channel_upgrade = "patch"
+  kubernetes_version        = var.kubernetes_version  
   sku_tier                  = "Standard"
+  automatic_channel_upgrade = "stable"
+  node_os_channel_upgrade   = "Unmanaged"
+
+  # Upgrade the cluster every first Sunday of a month at 1:00 am UTC for 8 hours
+  maintenance_window_auto_upgrade {
+    frequency   = "RelativeMonthly"
+    interval    = 1
+    day_of_week = "Sunday"
+    week_index  = "First"
+    duration    = 8
+    start_time  = "01:00"
+  }
+
+  # Upgrade the Node OS image every first Sunday of a month at 1:00 am UTC for 8 hours
+  maintenance_window_node_os {
+    frequency   = "RelativeMonthly"
+    interval    = 1
+    day_of_week = "Sunday"
+    week_index  = "First"
+    duration    = 8
+    start_time  = "01:00"
+  }
 
   default_node_pool {
     name                         = "system"