terraform: Define some new variables

This allows setting tfvars for:

 - Incus server address (scheme, address, port)
 - Name of storage pool
 - Name of network
 - OVN uplink configuration

Signed-off-by: Matt Johnson <[email protected]>

Author: mttjohnson

Diff for: README.md

@@ -25,6 +25,10 @@ tofu init
 ```
 
 Create 5 VMs and associated networks and storage volumes for testing an Incus cluster:
+If your Incus host needs different values from the default, you may need
+to copy `terraform.tfvars.example` to `terraform.tfvars` and update the
+variables.
+
 ```
 tofu apply -target=module.baremetal
 ```

Diff for: terraform/baremetal-incus/main.tf

@@ -17,9 +17,9 @@ resource "incus_network" "this" {
   description = "Network used to test incus-deploy (OVN uplink)"
 
   config = {
-    "ipv4.address" = "172.31.254.1/24"
+    "ipv4.address" = var.ovn_uplink_ipv4_address
     "ipv4.nat"     = "true"
-    "ipv6.address" = "fd00:1e4d:637d:1234::1/64"
+    "ipv6.address" = var.ovn_uplink_ipv6_address
     "ipv6.nat"     = "true"
   }
 }
@@ -49,7 +49,7 @@ resource "incus_profile" "this" {
     name = "eth0"
 
     properties = {
-      "network" = "incusbr0"
+      "network" = var.network
       "name"    = "eth0"
     }
   }

Diff for: terraform/baremetal-incus/variables.tf

@@ -17,3 +17,17 @@ variable "memory" {
 variable "storage_pool" {
   type = string
 }
+
+variable "network" {
+  type = string
+}
+
+variable "ovn_uplink_ipv4_address" {
+  type    = string
+  default = ""
+}
+
+variable "ovn_uplink_ipv6_address" {
+  type    = string
+  default = ""
+}

Diff for: terraform/main.tf

@@ -5,7 +5,12 @@ module "baremetal" {
   instance_names = ["server01", "server02", "server03", "server04", "server05"]
   image          = "images:ubuntu/22.04"
   memory         = "4GiB"
-  storage_pool   = "default"
+
+  storage_pool = var.incus_storage_pool
+  network      = var.incus_network
+
+  ovn_uplink_ipv4_address = var.ovn_uplink_ipv4_address
+  ovn_uplink_ipv6_address = var.ovn_uplink_ipv6_address
 }
 
 module "services" {
@@ -14,5 +19,7 @@ module "services" {
   project_name   = "dev-incus-deploy-services"
   instance_names = ["ceph-mds01", "ceph-mds02", "ceph-mds03", "ceph-mgr01", "ceph-mgr02", "ceph-mgr03", "ceph-rgw01", "ceph-rgw02", "ceph-rgw03"]
   image          = "images:ubuntu/24.04"
-  storage_pool   = "default"
+
+  storage_pool = var.incus_storage_pool
+  network      = var.incus_network
 }

Diff for: terraform/provider_incus.tf

@@ -0,0 +1,9 @@
+provider "incus" {
+  remote {
+    name    = "incus-deploy"
+    scheme  = var.incus_host_scheme
+    address = var.incus_host_address
+    port    = var.incus_host_port
+    default = True
+  }
+}

Diff for: terraform/services/main.tf

@@ -37,7 +37,7 @@ resource "incus_profile" "this" {
     name = "eth0"
 
     properties = {
-      "network" = "incusbr0"
+      "network" = var.network
       "name"    = "eth0"
     }
   }

Diff for: terraform/services/variables.tf

@@ -13,3 +13,8 @@ variable "image" {
 variable "storage_pool" {
   type = string
 }
+
+variable "network" {
+  type    = string
+  default = ""
+}

Diff for: terraform/terraform.tfvars.example

@@ -0,0 +1,22 @@
+# Example of terraform.tfvars
+#
+# You can copy the contents of this file to terraform.tfvars and modify
+# values for your own setup to operate with values different from the defaults
+#
+# A terraform.tfvars will override any other defined variables such as the ones
+# in *.auto.tfvars or defaults in variables.tf
+# https://opentofu.org/docs/language/values/variables/#variable-definitions-tfvars-files
+# https://opentofu.org/docs/language/values/variables/#variable-definition-precedence
+
+# Provider variables
+incus_host_scheme  = "unix"  # Protocol to access Incus (unix or https)
+incus_host_address = ""      # Address to reach Incus (IP address or FQDN if scheme is https)
+incus_host_port    = 8443    # Port to reach Incus (used when scheme is https)
+
+# Incus variables
+incus_storage_pool   = "default"  # Name of the storage pool to use for the VMs and volumes
+incus_network        = "incusbr0" # Name of the network to use for the VMs
+
+# OVN uplink configuration
+ovn_uplink_ipv4_address = "172.31.254.1/24"
+ovn_uplink_ipv6_address = "fd00:1e4d:637d:1234::1/64"

Diff for: terraform/variables.tf

@@ -0,0 +1,34 @@
+variable "incus_host_scheme" {
+  type    = string
+  default = "unix"
+}
+
+variable "incus_host_address" {
+  type    = string
+  default = ""
+}
+
+variable "incus_host_port" {
+  type    = number
+  default = 8443
+}
+
+variable "incus_storage_pool" {
+  type    = string
+  default = "default"
+}
+
+variable "incus_network" {
+  type    = string
+  default = "incusbr0"
+}
+
+variable "ovn_uplink_ipv4_address" {
+  type    = string
+  default = "172.31.254.1/24"
+}
+
+variable "ovn_uplink_ipv6_address" {
+  type    = string
+  default = "fd00:1e4d:637d:1234::1/64"
+}

Diff for: terraform/versions.tf

@@ -7,6 +7,3 @@ terraform {
     }
   }
 }
-
-provider "incus" {
-}