Add support for nginx streams

terraform/modules/apps/coredns/main.tf

@@ -45,7 +45,10 @@ resource "kubernetes_deployment" "dns" {
     }
 
     strategy {
-      type = "Recreate"
+      type = "RollingUpdate"
+      rolling_update {
+        max_unavailable = 1
+      }
     }
 
     template {
@@ -112,14 +115,12 @@ resource "kubernetes_deployment" "dns" {
           port {
             name           = "dns-tcp"
             container_port = 53
-            host_port      = 53
             protocol       = "TCP"
           }
 
           port {
             name           = "dns-udp"
             container_port = 53
-            host_port      = 53
             protocol       = "UDP"
           }
 
@@ -157,11 +158,15 @@ resource "kubernetes_deployment" "dns" {
       }
     }
   }
+
+  lifecycle {
+    ignore_changes = [spec[0].template[0].metadata[0].annotations["kubectl.kubernetes.io/restartedAt"]]
+  }
 }
 
-resource "kubernetes_service" "dns" {
+resource "kubernetes_service" "dns_internal" {
   metadata {
-    name      = "dns-ports"
+    name      = "dns"
     namespace = kubernetes_namespace.dns.metadata[0].name
   }
 
@@ -183,8 +188,6 @@ resource "kubernetes_service" "dns" {
       port        = 53
       target_port = 53
     }
-
-    type = "LoadBalancer"
   }
 
   lifecycle {

terraform/modules/apps/coredns/variables.tf

@@ -36,3 +36,9 @@ variable "zones" {
   }))
   default = []
 }
+
+variable "external_dns_enabled" {
+  description = "Enable listening on port 53 on the loadbalancer for external DNS resolution"
+  type        = bool
+  default     = false
+}