Conditional creation of modules - with already existing modules

Terraform
1

Hey,

I have a situation where a particular set of resources provided by a module are not required in our dev environment - I was wondering if theres an easy way to conditionally create / not create a module - for instance, I want the existing resources to be unaffected but not create any when the stage is dev - this works fine for dev - but when I try and run prod plans, it wants to delete and re create the modules resources due to the count:

like so
# module.gcp-networks[0].google_compute_network.vpc_network will be created

### GCP Networks ###
####################
module "gcp-networks" {
  count                         = var.stage == "prod" ? 1 : 0
  source                        = "../../../modules/gcp-networks"
  project_id                    = module.gcp-project.project_id
  gcp_region                    = var.gcp_region
  vpc_subnetwork_cidr_range     = var.vpc_subnetwork_cidr_range
  cluster_secondary_range_cidr  = var.cluster_secondary_range_cidr
  cluster_secondary_range_name  = var.cluster_secondary_range_name
  services_secondary_range_cidr = var.services_secondary_range_cidr
  services_secondary_range_name = var.services_secondary_range_name
  create_ingress_ip             = false
  vpc_flow_log_sampling         = var.vpc_flow_log_sampling
}

Same approach works with individual resources so I was hoping there would be something similar for modules.

Is there an easier way to tackle this situation?

Any help would be greatly appreciated.

Thanks!

2

I think I may be able to work around this with:

terraform state mv "module.gcp-networks" "module.gcp-networks[0]"
3

Hi @leecoupe27,

Yes, terraform state mv is the typical way to let Terraform know that you intend this to be a “rename” rather than a destroy and a create.