Decouple installation name from Kubernetes namespace name

Author: jverce

locals.tf

@@ -1,4 +1,5 @@
 locals {
-  namespace  = data.kubernetes_namespace.this.metadata.0.name
-  account_id = data.aws_caller_identity.current.account_id
+  namespace_name = coalesce(var.namespace_name, var.name)
+  namespace      = data.kubernetes_namespace.this.metadata.0.name
+  account_id     = data.aws_caller_identity.current.account_id
 }

main.tf

@@ -2,22 +2,24 @@ resource "kubernetes_namespace" "this" {
   count = var.namespace_deploy ? 1 : 0
 
   metadata {
-    name = var.name
+    name = local.namespace_name
 
     labels = {
-      name        = var.name
+      name        = local.namespace_name
       description = var.description
     }
   }
 }
 
+// Retrieving this data will ensure that the target Kubernetes namespace exists
+// before proceeding
 data "kubernetes_namespace" "this" {
   metadata {
-    name = var.name
+    name = local.namespace_name
   }
 
   depends_on = [
-    kubernetes_namespace.this
+    kubernetes_namespace.this,
   ]
 }
 

variables.tf

@@ -23,10 +23,16 @@ variable "iam_deploy" {
 
 variable "name" {
   default     = "velero"
-  description = "Namespace name"
+  description = "Installation name"
   type        = string
 }
 
+variable "namespace_name" {
+  description = "Kubernetes namespace name. If left unset, the `name` variable will be used instead."
+  type        = string
+  optional    = true
+}
+
 variable "description" {
   default     = "velero-back-up-and-restore"
   description = "Namespace description"