Add brownfield support and production-ready module enhancements

modules/bootstrap/main.tf

@@ -5,103 +5,137 @@ terraform {
       source  = "harvester/harvester"
       version = "~> 1.7"
     }
-    rancher2 = {
-      source  = "rancher/rancher2"
-      version = "~> 13.1"
-    }
     tls = {
       source  = "hashicorp/tls"
       version = "~> 4.0"
     }
   }
 }
 
+# ── SSH key pair (greenfield only) ────────────────────────────────────────────
+# Set create_ssh_key = false to attach existing ssh_key_ids instead.
 resource "tls_private_key" "bootstrap_key" {
+  count     = var.create_ssh_key ? 1 : 0
   algorithm = "RSA"
   rsa_bits  = 4096
 }
 
 resource "harvester_ssh_key" "bootstrap_key" {
+  count      = var.create_ssh_key ? 1 : 0
   name       = "${var.vm_name}-ssh-key"
   namespace  = var.harvester_namespace
-  public_key = tls_private_key.bootstrap_key.public_key_openssh
+  public_key = tls_private_key.bootstrap_key[0].public_key_openssh
 }
 
-# Removed dynamic VLAN creation as DHCP is failing in the cluster
-
-# 1. Create the Cloud-Init Secret for the VM (Bypasses 2KB limit)
+# ── Cloud-init secret (greenfield only) ──────────────────────────────────────
+# Set create_cloudinit_secret = false and provide existing_cloudinit_secret_name instead.
 resource "harvester_cloudinit_secret" "cloudinit" {
-  count     = var.node_count
+  count     = var.create_cloudinit_secret ? var.node_count : 0
   name      = var.node_count > 1 ? "${var.vm_name}-cloudinit-${count.index}" : "${var.vm_name}-cloudinit"
   namespace = var.harvester_namespace
 
   user_data = templatefile("${path.module}/templates/cloud-init.yaml.tpl", {
-    password         = var.vm_password,
-    cluster_dns      = var.rancher_hostname,
-    rancher_password = var.bootstrap_password,
-    ssh_public_key   = tls_private_key.bootstrap_key.public_key_openssh,
-    node_index       = count.index,
-    node_count       = var.node_count,
-    lb_ip            = var.ippool_start # Using the LB IP for join logic
+    password         = var.vm_password
+    cluster_dns      = var.rancher_hostname
+    rancher_password = var.bootstrap_password
+    ssh_public_key   = tls_private_key.bootstrap_key[0].public_key_openssh
+    node_index       = count.index
+    node_count       = var.node_count
+    lb_ip            = var.ippool_start
   })
 }
 
-# 2. Create the Harvester VM
+locals {
+  # Resolve the SSH key IDs: either freshly generated or caller-supplied
+  ssh_key_ids = var.create_ssh_key ? [harvester_ssh_key.bootstrap_key[0].id] : var.ssh_key_ids
+
+  # Resolve the cloud-init secret name: generated or pre-existing
+  cloudinit_secret_name = var.create_cloudinit_secret ? harvester_cloudinit_secret.cloudinit[0].name : var.existing_cloudinit_secret_name
+}
+
+# ── Rancher server VM ─────────────────────────────────────────────────────────
 resource "harvester_virtualmachine" "rancher_server" {
   count                = var.node_count
   name                 = var.node_count > 1 ? "${var.vm_name}-${count.index}" : var.vm_name
   namespace            = var.harvester_namespace
   restart_after_update = true
 
-  cpu    = 4
-  memory = "8Gi"
+  cpu    = var.vm_cpu
+  memory = var.vm_memory
 
   run_strategy = "RerunOnFailure"
   machine_type = "q35"
 
-  ssh_keys = [harvester_ssh_key.bootstrap_key.id]
+  ssh_keys = local.ssh_key_ids
+
+  # Masquerade (NAT): default for greenfield; no external network required
+  dynamic "network_interface" {
+    for_each = var.network_type == "masquerade" ? [1] : []
+    content {
+      name = var.network_interface_name
+      type = "masquerade"
+    }
+  }
 
-  network_interface {
-    name = "nic-1"
-    type = "masquerade"
+  # Bridge: for VMs that need direct VLAN access (e.g. existing production VMs)
+  dynamic "network_interface" {
+    for_each = var.network_type == "bridge" ? [1] : []
+    content {
+      name         = var.network_interface_name
+      type         = "bridge"
+      network_name = var.network_name
+      mac_address  = var.network_mac_address != "" ? var.network_mac_address : null
+    }
   }
 
   disk {
-    name       = "rootdisk"
+    name       = var.vm_disk_name
     type       = "disk"
-    size       = "40Gi"
+    size       = var.vm_disk_size
     bus        = "virtio"
     boot_order = 1
 
     image       = var.ubuntu_image_id
-    auto_delete = true
+    auto_delete = var.vm_disk_auto_delete
+  }
+
+  # USB tablet input device — some VMs require this for correct cursor behaviour
+  # in the Harvester console; set enable_usb_tablet = true to include it.
+  dynamic "input" {
+    for_each = var.enable_usb_tablet ? [1] : []
+    content {
+      name = "tablet"
+      type = "tablet"
+      bus  = "usb"
+    }
   }
 
   cloudinit {
-    user_data_secret_name = harvester_cloudinit_secret.cloudinit[count.index].name
-    network_data          = ""
+    user_data_secret_name    = local.cloudinit_secret_name
+    network_data_secret_name = var.create_cloudinit_secret ? null : local.cloudinit_secret_name
   }
 
-  # Rancher is installed entirely by cloud-init inside the VM (RKE2 + cert-manager + Helm).
-  # The VM uses a masquerade network so Terraform cannot SSH into it directly.
   provisioner "local-exec" {
-    command = "echo 'Please wait for cloud-init to finish installing RKE2/K3s and Rancher internally!'"
+    command = var.create_cloudinit_secret ? "echo 'VM created — cloud-init will install RKE2/Rancher internally.'" : "echo 'VM imported — cloud-init ran at initial provision time.'"
   }
 }
 
-# 3. Expose the Rancher VM via a Load Balancer
+# ── Load Balancer + IP Pool (greenfield only) ─────────────────────────────────
+# Set create_lb = false when the Rancher VM is reachable directly via its
+# bridge IP (no dedicated LB/IP-pool needed).
 resource "harvester_loadbalancer" "rancher_lb" {
+  count     = var.create_lb ? 1 : 0
   name      = "${var.vm_name}-lb"
   namespace = var.harvester_namespace
 
   depends_on = [
     harvester_virtualmachine.rancher_server,
-    harvester_ippool.rancher_ips
+    harvester_ippool.rancher_ips,
   ]
 
   workload_type = "vm"
   ipam          = "pool"
-  ippool        = harvester_ippool.rancher_ips.name
+  ippool        = harvester_ippool.rancher_ips[0].name
 
   listener {
     name         = "https"
@@ -131,9 +165,9 @@ resource "harvester_loadbalancer" "rancher_lb" {
   }
 }
 
-# 4. Create an IP Pool for the Load Balancer
 resource "harvester_ippool" "rancher_ips" {
-  name = "${var.vm_name}-ips"
+  count = var.create_lb ? 1 : 0
+  name  = "${var.vm_name}-ips"
 
   range {
     start   = var.ippool_start
@@ -142,11 +176,3 @@ resource "harvester_ippool" "rancher_ips" {
     gateway = var.ippool_gateway
   }
 }
-
-# Rancher is installed inside the VM by cloud-init (cert-manager + Helm).
-# rancher2_bootstrap waits for Rancher to be reachable and sets the permanent admin
-# password. Re-run `terraform apply` if Rancher is still starting up on first attempt.
-resource "rancher2_bootstrap" "admin" {
-  initial_password = var.bootstrap_password
-  password         = var.rancher_admin_password
-}

modules/bootstrap/outputs.tf

@@ -1,15 +1,18 @@
+locals {
+  rancher_lb_ip = var.create_lb ? harvester_loadbalancer.rancher_lb[0].ip_address : var.static_rancher_ip
+}
+
 output "rancher_hostname" {
   value       = var.rancher_hostname
-  description = "The FQDN of the bootstrapped Rancher server"
+  description = "FQDN of the Rancher server"
 }
 
 output "rancher_lb_ip" {
-  value       = harvester_loadbalancer.rancher_lb.ip_address
-  description = "The IP address of the LoadBalancer exposing Rancher"
+  value       = local.rancher_lb_ip
+  description = "IP used to reach Rancher: LoadBalancer IP (greenfield) or bridge VM IP (brownfield)"
 }
 
-output "admin_token" {
-  value       = rancher2_bootstrap.admin.token
-  description = "Rancher admin API token for use by downstream phases"
-  sensitive   = true
+output "vm_id" {
+  value       = harvester_virtualmachine.rancher_server[0].id
+  description = "Harvester resource ID of the Rancher server VM (namespace/name)"
 }