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Use Terraform variables and workspaces to maintain identical resource configurations across environments such as preproduction and production. This workflow applies to all Gcore Terraform resources and is compatible with both provider v0 and v2.
Configure API keys and initialize Terraform before proceeding.

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Step 1. Define variables

Create a variables.tf file to declare the parameters that differ between environments. The following variables are common across all products: 
// variables.tf
variable "api_token" {
  description = "API token for access to your Gcore account"
  type        = string
  sensitive   = true
}

variable "api_endpoint" {
  description = "Gcore API URL"
  type        = string
}
Add the resource-specific variable for the target product: 
variable "cdn_resource_cname" {
  description = "Custom domain of the CDN resource"
  type        = string
}

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Step 2. Configure environment variables

Create a separate .tfvars file for each environment. The common fields are identical across products: 
api_token    = "your-api-token"
api_endpoint = "https://api.gcore.com"
Add the resource-specific value for each environment: 
// preprod.tfvars
api_token          = "your-preprod-api-token"
api_endpoint       = "https://api.gcore.com"
cdn_resource_cname = "preprod.example.com"

// production.tfvars
api_token          = "your-production-api-token"
api_endpoint       = "https://api.gcore.com"
cdn_resource_cname = "prod.example.com"

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Step 3. Write the resource configuration

Add the following to main.tf. The provider block is identical for all products: 
terraform {
  required_providers {
    gcore = {
      source  = "G-Core/gcore"
      version = ">= 0.8.20"
    }
  }
}

provider "gcore" {
  permanent_api_token = var.api_token
  api_endpoint        = var.api_endpoint
}
Add the resource block for the target product: 
resource "gcore_cdn_resource" "example" {
  cname  = var.cdn_resource_cname
  origin = "example.com"
}

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Step 4. Initialize Terraform

From the project directory, run: 
terraform init
This downloads the Gcore provider and prepares the working directory.

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Step 5. Use Terraform workspaces

Terraform workspaces manage multiple environments from the same configuration — each workspace maintains an independent state file, so changes in preprod do not affect production. Create workspaces for preproduction and production: 
terraform workspace new preprod
terraform workspace new production

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Step 6. Apply the configuration

Switch to the preproduction workspace and apply the configuration: 
terraform workspace select preprod
terraform apply -var-file=preprod.tfvars
Then switch to the production workspace and apply the configuration there as well: 
terraform workspace select production
terraform apply -var-file=production.tfvars
The same configuration now runs in both environments, with each workspace tracking its own state independently.