use cloud-init rather than block_devices to create state directory

Author: sjpb

environments/smslabs/inventory/group_vars/all/block_devices.yml

@@ -37,7 +37,6 @@ compute
 cluster
 
 [block_devices:children]
-control
 
 [fail2ban:children]
 login

environments/smslabs/inventory/groups

@@ -0,0 +1,12 @@
+#cloud-config
+disk_setup:
+  /dev/vdb:
+    table_type: gpt
+    layout: true
+fs_setup:
+  - label: control_state
+    filesystem: ext4
+    device: /dev/vdb
+    partition: auto
+mounts:
+  - [LABEL=control_state, ${state_dir}]

environments/smslabs/terraform/.terraform.lock.hcl

@@ -3,7 +3,7 @@ resource "local_file" "hosts" {
                           {
                             "cluster_name": var.cluster_name
                             "control": openstack_compute_instance_v2.control,
-                            "control_volume": openstack_blockstorage_volume_v3.control
+                            "state_dir": var.state_dir
                             "logins": openstack_compute_instance_v2.login,
                             "computes": openstack_compute_instance_v2.compute,
                             "compute_types": var.compute_types,

environments/smslabs/terraform/init.tpl

@@ -1,10 +1,9 @@
 [all:vars]
 ansible_user=rocky
 openhpc_cluster_name=${cluster_name}
-state_volume_serial=${control_volume.id}
 
 [control]
-${control.name} ansible_host=${[for n in control.network: n.fixed_ip_v4 if n.access_network][0]} server_networks='${jsonencode({for net in control.network: net.name => [ net.fixed_ip_v4 ] })}'
+${control.name} ansible_host=${[for n in control.network: n.fixed_ip_v4 if n.access_network][0]} server_networks='${jsonencode({for net in control.network: net.name => [ net.fixed_ip_v4 ] })}' appliances_state_dir=${state_dir}
 
 [login]
 %{ for login in logins ~}

environments/smslabs/terraform/inventory.tf

@@ -2,6 +2,21 @@ data "openstack_images_image_v2" "control" {
   name = var.control_node.image
 }
 
+data "template_cloudinit_config" "config" {
+  gzip          = true
+  base64_encode = true
+
+  part {
+    filename     = "user-data"
+    content_type = "text/cloud-config"
+    content      = templatefile("${path.module}/init.tpl",
+                                {
+                                  state_dir = var.state_dir
+                                }
+                              )
+  }
+}
+
 resource "openstack_compute_instance_v2" "control" {
 
   name = "${var.cluster_name}-control"
@@ -37,6 +52,8 @@ resource "openstack_compute_instance_v2" "control" {
     environment_root = var.environment_root
   }
 
+  user_data = data.template_cloudinit_config.config.rendered
+
 }
 
 resource "openstack_compute_instance_v2" "login" {

environments/smslabs/terraform/inventory.tpl

@@ -71,3 +71,9 @@ variable "environment_root" {
     type = string
     description = "Path to environment root, automatically set by activate script"
 }
+
+variable "state_dir" {
+    type = string
+    description = "Path to state directory on control node"
+    default = "/var/lib/state"
+}