Support creating multiple affinit groups (#96)

A new variable affinity_group_capacity defines the capacity of an affinity group.

control_plane.tf

@@ -26,6 +26,7 @@ module "master" {
     exoscale_security_group.control_plane.id,
   ]
 
+  affinity_group_capacity       = var.affinity_group_capacity
   additional_affinity_group_ids = var.additional_affinity_group_ids
 
   deploy_target_id = var.deploy_target_id

infra.tf

@@ -27,6 +27,7 @@ module "infra" {
     exoscale_security_group.infra.id,
   ]
 
+  affinity_group_capacity       = var.affinity_group_capacity
   additional_affinity_group_ids = var.additional_affinity_group_ids
 
   deploy_target_id = var.deploy_target_id

modules/node-group/main.tf

@@ -1,6 +1,9 @@
 locals {
   disk_size = var.root_disk_size + var.data_disk_size + var.storage_disk_size
 
+  anti_affinity_group_capacity = var.affinity_group_capacity > 0 ? var.affinity_group_capacity : 999999
+  anti_affinity_group_count    = var.affinity_group_capacity > 0 ? ceil(var.node_count / var.affinity_group_capacity) : 1
+
   ignition_source = {
     "bootstrap" = "${trimsuffix(var.bootstrap_bucket, "/")}/bootstrap.ign"
     "master"    = "https://${var.api_int}:22623/config/master"
@@ -161,8 +164,8 @@ resource "random_id" "node_id" {
 }
 
 resource "exoscale_anti_affinity_group" "anti_affinity_group" {
-  count       = var.node_count > 0 ? 1 : 0
-  name        = "${var.cluster_id}_${var.role}"
+  count       = var.node_count != 0 ? local.anti_affinity_group_count : 0
+  name        = count.index > 0 ? "${var.cluster_id}_${var.role}_${count.index}" : "${var.cluster_id}_${var.role}"
   description = "${var.cluster_id} ${var.role} nodes"
 }
 
@@ -181,7 +184,7 @@ resource "exoscale_compute_instance" "nodes" {
 
   security_group_ids = var.security_group_ids
   anti_affinity_group_ids = concat(
-    [exoscale_anti_affinity_group.anti_affinity_group[0].id],
+    [exoscale_anti_affinity_group.anti_affinity_group[floor(count.index / local.anti_affinity_group_capacity)].id],
     var.additional_affinity_group_ids
   )
 

modules/node-group/variables.tf

@@ -120,3 +120,9 @@ variable "deploy_target_id" {
   default     = ""
   description = "ID of special deployment target, e.g. dedicated hypervisors"
 }
+
+variable "affinity_group_capacity" {
+  type        = number
+  default     = 0
+  description = "Capacity of the affinity group, e.g. when using dedicated hypervisors, default: 0 (unlimited)"
+}

storage.tf

@@ -31,6 +31,7 @@ module "storage" {
     exoscale_security_group.storage.id,
   ]
 
+  affinity_group_capacity       = var.affinity_group_capacity
   additional_affinity_group_ids = var.additional_affinity_group_ids
 
   deploy_target_id = var.deploy_target_id

variables.tf

@@ -193,6 +193,12 @@ variable "deploy_target_id" {
   description = "ID of special deployment target, e.g. dedicated hypervisors"
 }
 
+variable "affinity_group_capacity" {
+  type        = number
+  default     = 0
+  description = "Capacity of the affinity group, e.g. when using dedicated hypervisors, default: 0 (unlimited)"
+}
+
 variable "ignition_ca" {
   type = string
 }

worker.tf

@@ -29,6 +29,7 @@ module "worker" {
     [exoscale_security_group.all_machines.id]
   )
 
+  affinity_group_capacity       = var.affinity_group_capacity
   additional_affinity_group_ids = var.additional_affinity_group_ids
 
   deploy_target_id = var.deploy_target_id
@@ -73,6 +74,7 @@ module "additional_worker" {
     [exoscale_security_group.all_machines.id]
   )
 
+  affinity_group_capacity = var.affinity_group_capacity
   additional_affinity_group_ids = concat(
     each.value.affinity_group_ids != null ? each.value.affinity_group_ids : [],
     var.additional_affinity_group_ids