fix(ad): use dynamic AD attribution to avoid the "Out of Host capacity" error on the free tier

Author: timoa

instance.tf

@@ -26,7 +26,7 @@ resource "oci_core_instance" "instance" {
 
   # Global
   compartment_id      = var.compartment_ocid
-  availability_domain = data.oci_identity_availability_domain.ad.name
+  availability_domain = local.availability_domain
   display_name        = local.instance_name
 
   # Instance

instance_volume.tf

@@ -5,7 +5,7 @@ resource "oci_core_volume" "volume" {
 
   # Global
   compartment_id      = var.compartment_ocid
-  availability_domain = data.oci_identity_availability_domain.ad.name
+  availability_domain = local.availability_domain
   display_name        = local.block_volume_name
 
   # Volume

main.tf

@@ -4,10 +4,11 @@ locals {
     "project"     = var.namespace
     "environment" = var.stage
   })
+  availability_domains = data.oci_identity_availability_domains.ads.availability_domains[*].name
+  availability_domain  = reverse(local.availability_domains)[0] # Use last AD to try to avoid the "Out of Host capacity" on free tier
 }
 
-# Identity Availability Domain
-data "oci_identity_availability_domain" "ad" {
+# Identity Availability Domains
+data "oci_identity_availability_domains" "ads" {
   compartment_id = var.compartment_ocid
-  ad_number      = 1
 }

network.tf

@@ -63,7 +63,7 @@ resource "oci_core_subnet" "subnet" {
   # Subnet
   display_name        = local.subnet_name
   dns_label           = local.dns_name
-  availability_domain = data.oci_identity_availability_domain.ad.name
+  availability_domain = local.availability_domain
   cidr_block          = "10.1.20.0/24"
   route_table_id      = oci_core_vcn.vcn.default_route_table_id
   dhcp_options_id     = oci_core_vcn.vcn.default_dhcp_options_id