issue #28 - RegionInstanceGroupManager is forced to be re-created - fix.

CHANGELOG.md

@@ -7,6 +7,14 @@ project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased]
 
+## [1.1.1] - 2019-10-25
+
+### Fixed
+
+- Fix bug with `distribution_policy_zones` forcing permadiff. [#37]
+
+## [1.1.0] - 2019-10-23
+
 ### Added
 
 - Added variable `project_id`. [#26]
@@ -45,3 +53,4 @@ project adheres to [Semantic Versioning](http://semver.org/).
 [#16]: https://github.com/terraform-google-modules/terraform-google-vm/pull/16
 [#18]: https://github.com/terraform-google-modules/terraform-google-vm/pull/18
 [#26]: https://github.com/terraform-google-modules/terraform-google-vm/pull/26
+[#37]: https://github.com/terraform-google-modules/terraform-google-vm/pull/37

README.md

@@ -25,6 +25,11 @@ The following APIs must be enabled on your project:
 
 See also the [project_services](modules/project_services) module (optional).
 
+## Notes
+
+`distribution_policy_zones` cannot be changed during use. If you have changed them yourself or 
+used to have a default value, then you'll have to force recreate a MIG group yourself.
+
 ## Test Configuration
 
 1. Create a `terraform.tfvars` file, using `terraform.tfvars.example` as an example

modules/mig/main.tf

@@ -56,6 +56,7 @@ resource "google_compute_region_instance_group_manager" "mig" {
     health_check      = length(local.healthchecks) > 0 ? local.healthchecks[0] : ""
     initial_delay_sec = length(local.healthchecks) > 0 ? var.hc_initial_delay_sec : 0
   }
+
   distribution_policy_zones = local.distribution_policy_zones
   dynamic "update_policy" {
     for_each = var.update_policy
@@ -72,6 +73,7 @@ resource "google_compute_region_instance_group_manager" "mig" {
 
   lifecycle {
     create_before_destroy = "true"
+    ignore_changes = ["distribution_policy_zones"]
   }
 }
 
@@ -141,4 +143,3 @@ resource "google_compute_health_check" "tcp_healthcheck" {
     port = var.hc_port
   }
 }
-

modules/mig_with_percent/main.tf

@@ -82,6 +82,7 @@ resource "google_compute_region_instance_group_manager" "mig_with_percent" {
 
   lifecycle {
     create_before_destroy = "true"
+    ignore_changes = ["distribution_policy_zones"]
   }
 }