terraform/projects/kubernetes_vms/main.tf

@@ -32,15 +32,19 @@ locals {
   # Per-role simple overrides merged over vm_attr defaults (null keeps the default)
   role_overrides = {
     for role, cfg in var.vm_attr : role => lookup({
-      "master" = { ram = var.master_ram != null ? var.master_ram * 1024 : null, cpu = var.master_cpu, vlan = var.master_vlan }
-      "worker" = { ram = var.worker_ram != null ? var.worker_ram * 1024 : null, cpu = var.worker_cpu, vlan = var.worker_vlan }
+      "master" = { count = var.master_count, ram = var.master_ram != null ? var.master_ram * 1024 : null, cpu = var.master_cpu, vlan = var.master_vlan }
+      "worker" = { count = var.worker_count, ram = var.worker_ram != null ? var.worker_ram * 1024 : null, cpu = var.worker_cpu, vlan = var.worker_vlan }
     }, role, {})
   }
 
+  # Internal placement rule: the control-plane role (master) sits one per node, pack roles are unlimited
+  cp_role_name      = "master"
+  role_max_per_node = { for role, cfg in var.vm_attr : role => role == local.cp_role_name ? 1 : 0 }
+
   effective_vm_attr = {
     for role, cfg in var.vm_attr : role => merge(cfg, {
       for attr, value in local.role_overrides[role] : attr => value if value != null
-    })
+    }, { max_per_node = local.role_max_per_node[role] })
   }
 
   # Control plane (max_per_node = 1): one VM per node, only on nodes with enough free memory

terraform/projects/kubernetes_vms/variables.tf

@@ -22,32 +22,32 @@ variable "proxmox_ssh_password" {
 }
 
 variable "vm_attr" {
-  description = "VM attributes per role. max_per_node = 0 means unlimited VMs per node."
+  description = "VM attributes per role. The control-plane role (master) is placed one per node; other roles are packed without a per-node limit."
   type = map(object({
     ram   = number
     cpu   = number
     vlan  = number
     count = number
-    max_per_node = number
   }))
   default = {
-    "master" = { ram = 2048, cpu = 2, vlan = 66, count = 3, max_per_node = 1 }
-    "worker" = { ram = 4096, cpu = 2, vlan = 66, count = 3, max_per_node = 0 }
+    "master" = { ram = 2048, cpu = 2, vlan = 66, count = 3 }
+    "worker" = { ram = 4096, cpu = 2, vlan = 66, count = 3 }
   }
 
   validation {
     condition     = alltrue([for v in values(var.vm_attr) : v.count >= 1])
     error_message = "Each role must deploy at least 1 VM."
   }
-
-  validation {
-    condition     = alltrue([for v in values(var.vm_attr) : v.max_per_node >= 0])
-    error_message = "max_per_node must be 0 (unlimited) or a positive number."
 }
 
+variable "master_count" {
+  description = "Master role VM count override. null keeps the vm_attr default."
+  type        = number
+  default     = null
+
   validation {
-    condition     = length([for v in values(var.vm_attr) : v if v.max_per_node == 1]) == 1
-    error_message = "Exactly one role must have max_per_node = 1 (the control-plane role)."
+    condition     = var.master_count == null || var.master_count >= 1
+    error_message = "master_count must be null or at least 1."
   }
 }
 
@@ -84,6 +84,17 @@ variable "master_vlan" {
   }
 }
 
+variable "worker_count" {
+  description = "Worker role VM count override. null keeps the vm_attr default."
+  type        = number
+  default     = null
+
+  validation {
+    condition     = var.worker_count == null || var.worker_count >= 1
+    error_message = "worker_count must be null or at least 1."
+  }
+}
+
 variable "worker_cpu" {
   description = "Worker role CPU override. null keeps the vm_attr default."
   type        = number