fix: explicitly set fallback values for ssh key and admin password

examples/authentication/README.md

@@ -0,0 +1,71 @@
+This module enables flexible kubernetes cluster setup by supporting both auto generated and user supplied (bring your own) ssh keys and passwords for tailored access.
+
+## Usage: generated password or ssh key
+
+To utilize the generated password or ssh key, simply specify the key vault id in your configuration:
+
+```hcl
+module "aks" {
+  source  = "cloudnationhq/aks/azure"
+  version = "~> 0.1"
+
+  keyvault = module.kv.vault.id
+
+  cluster = {
+    name          = module.naming.kubernetes_cluster.name_unique
+    location      = module.rg.groups.demo.location
+    resourcegroup = module.rg.groups.demo.name
+    depends_on    = [module.kv]
+    profile       = "linux"
+    dns_prefix    = "demo"
+  }
+}
+```
+
+## Usage: bringing your own password or ssh key
+
+To use your own password or SSH key, use the below properties in your configuration:
+
+```hcl
+module "aks-linux" {
+  source  = "cloudnationhq/aks/azure"
+  version = "~> 0.1"
+
+  cluster = {
+    name               = "${module.naming.kubernetes_cluster.name}-02"
+    location           = module.rg.groups.demo.location
+    resourcegroup      = module.rg.groups.demo.name
+    node_resourcegroup = "${module.rg.groups.demo.name}-node02"
+    depends_on         = [module.kv]
+    profile            = "linux"
+    dns_prefix         = "demo2"
+    sku_tier           = "Standard"
+
+    public_key = module.kv.tls_public_keys.tls.value
+  }
+}
+```
+
+```hcl
+module "aks-windows" {
+  source  = "cloudnationhq/aks/azure"
+  version = "~> 0.1"
+
+  cluster = {
+    name               = "${module.naming.kubernetes_cluster.name}-01"
+    location           = module.rg.groups.demo.location
+    resourcegroup      = module.rg.groups.demo.name
+    node_resourcegroup = "${module.rg.groups.demo.name}-node01"
+    depends_on         = [module.kv]
+    profile            = "windows"
+    dns_prefix         = "demo1"
+    sku_tier           = "Standard"
+
+    network_profile = {
+      network_plugin = "azure"
+    }
+
+    password = module.kv.secrets.password.value
+  }
+}
+```

examples/authentication/locals.tf

@@ -0,0 +1,8 @@
+locals {
+  naming = {
+    # lookup outputs to have consistent naming
+    for type in local.naming_types : type => lookup(module.naming, type).name
+  }
+
+  naming_types = ["key_vault_secret"]
+}

examples/authentication/main.tf

@@ -0,0 +1,86 @@
+module "naming" {
+  source  = "cloudnationhq/naming/azure"
+  version = "~> 0.1"
+
+  suffix = ["demo", "dev"]
+}
+
+module "rg" {
+  source  = "cloudnationhq/rg/azure"
+  version = "~> 0.1"
+
+  groups = {
+    demo = {
+      name   = module.naming.resource_group.name
+      region = "westeurope"
+    }
+  }
+}
+
+module "kv" {
+  source  = "cloudnationhq/kv/azure"
+  version = "~> 0.1"
+
+  naming = local.naming
+
+  vault = {
+    name          = module.naming.key_vault.name_unique
+    location      = module.rg.groups.demo.location
+    resourcegroup = module.rg.groups.demo.name
+
+    secrets = {
+      tls_keys = {
+        tls = {
+          algorithm = "RSA"
+          key_size  = 2048
+        }
+      }
+      random_string = {
+        password = {
+          length  = 24
+          special = false
+        }
+      }
+    }
+  }
+}
+
+module "aks-windows" {
+  source  = "cloudnationhq/aks/azure"
+  version = "~> 0.1"
+
+  cluster = {
+    name               = "${module.naming.kubernetes_cluster.name}-01"
+    location           = module.rg.groups.demo.location
+    resourcegroup      = module.rg.groups.demo.name
+    node_resourcegroup = "${module.rg.groups.demo.name}-node01"
+    depends_on         = [module.kv]
+    profile            = "windows"
+    dns_prefix         = "demo1"
+    sku_tier           = "Standard"
+
+    network_profile = {
+      network_plugin = "azure"
+    }
+
+    password = module.kv.secrets.password.value
+  }
+}
+
+module "aks-linux" {
+  source  = "cloudnationhq/aks/azure"
+  version = "~> 0.1"
+
+  cluster = {
+    name               = "${module.naming.kubernetes_cluster.name}-02"
+    location           = module.rg.groups.demo.location
+    resourcegroup      = module.rg.groups.demo.name
+    node_resourcegroup = "${module.rg.groups.demo.name}-node02"
+    depends_on         = [module.kv]
+    profile            = "linux"
+    dns_prefix         = "demo2"
+    sku_tier           = "Standard"
+
+    public_key = module.kv.tls_public_keys.tls.value
+  }
+}

examples/authentication/terraform.tf

@@ -0,0 +1,22 @@
+terraform {
+  required_version = "~> 1.0"
+
+  required_providers {
+    azurerm = {
+      source  = "hashicorp/azurerm"
+      version = "~> 3.61"
+    }
+    tls = {
+      source  = "hashicorp/tls"
+      version = "~> 4.0"
+    }
+    random = {
+      source  = "hashicorp/random"
+      version = "~> 3.0"
+    }
+  }
+}
+
+provider "azurerm" {
+  features {}
+}

main.tf

@@ -197,7 +197,7 @@ resource "azurerm_kubernetes_cluster" "aks" {
 
     content {
       admin_username = try(var.cluster.username, "nodeadmin")
-      admin_password = try(var.cluster.password, azurerm_key_vault_secret.secret[windows_profile.key].value)
+      admin_password = try(var.cluster.password, null) != null ? var.cluster.password : azurerm_key_vault_secret.secret["default"].value
     }
   }
 
@@ -209,7 +209,7 @@ resource "azurerm_kubernetes_cluster" "aks" {
     content {
       admin_username = try(var.cluster.username, "nodeadmin")
       ssh_key {
-        key_data = try(var.cluster.public_key, tls_private_key.tls_key[var.cluster.name].public_key_openssh)
+        key_data = try(var.cluster.public_key, null) != null ? var.cluster.public_key : tls_private_key.tls_key["default"].public_key_openssh
       }
     }
   }

variables.tf

@@ -12,6 +12,7 @@ variable "cluster" {
 variable "keyvault" {
   description = "keyvault to store secrets"
   type        = string
+  default     = null
 }
 
 variable "location" {