> ## Documentation Index
> Fetch the complete documentation index at: https://gcore.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Copy resources across environments

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.

<Tip>
  Configure [API keys](/account-settings/api-tokens#create-a-permanent-api-token) and [initialize Terraform](/developer-tools/terraform/get-started-with-terraform) before proceeding.
</Tip>

## 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:

```hcl theme={null}
// 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:

<Tabs>
  <Tab title="CDN">
    ```hcl theme={null}
    variable "cdn_resource_cname" {
      description = "Custom domain of the CDN resource"
      type        = string
    }
    ```
  </Tab>

  <Tab title="Cloud">
    ```hcl theme={null}
    variable "network_name" {
      description = "Name of the Cloud network"
      type        = string
    }
    ```
  </Tab>

  <Tab title="DNS">
    ```hcl theme={null}
    variable "zone_name" {
      description = "DNS zone name"
      type        = string
    }
    ```
  </Tab>
</Tabs>

## Step 2. Configure environment variables

Create a separate `.tfvars` file for each environment. The common fields are identical across products:

```hcl theme={null}
api_token    = "your-api-token"
api_endpoint = "https://api.gcore.com"
```

Add the resource-specific value for each environment:

<Tabs>
  <Tab title="CDN">
    ```hcl theme={null}
    // preprod.tfvars
    api_token          = "your-preprod-api-token"
    api_endpoint       = "https://api.gcore.com"
    cdn_resource_cname = "preprod.example.com"
    ```

    ```hcl theme={null}
    // production.tfvars
    api_token          = "your-production-api-token"
    api_endpoint       = "https://api.gcore.com"
    cdn_resource_cname = "prod.example.com"
    ```
  </Tab>

  <Tab title="Cloud">
    ```hcl theme={null}
    // preprod.tfvars
    api_token    = "your-preprod-api-token"
    api_endpoint = "https://api.gcore.com"
    network_name = "preprod-network"
    ```

    ```hcl theme={null}
    // production.tfvars
    api_token    = "your-production-api-token"
    api_endpoint = "https://api.gcore.com"
    network_name = "prod-network"
    ```
  </Tab>

  <Tab title="DNS">
    ```hcl theme={null}
    // preprod.tfvars
    api_token    = "your-preprod-api-token"
    api_endpoint = "https://api.gcore.com"
    zone_name    = "preprod.example.com"
    ```

    ```hcl theme={null}
    // production.tfvars
    api_token    = "your-production-api-token"
    api_endpoint = "https://api.gcore.com"
    zone_name    = "prod.example.com"
    ```
  </Tab>
</Tabs>

## Step 3. Write the resource configuration

Add the following to `main.tf`. The provider block is identical for all products:

```hcl theme={null}
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:

<Tabs>
  <Tab title="CDN">
    ```hcl theme={null}
    resource "gcore_cdn_resource" "example" {
      cname  = var.cdn_resource_cname
      origin = "example.com"
    }
    ```
  </Tab>

  <Tab title="Cloud">
    ```hcl theme={null}
    resource "gcore_network" "example" {
      name = var.network_name
    }
    ```
  </Tab>

  <Tab title="DNS">
    ```hcl theme={null}
    resource "gcore_dns_zone" "example" {
      name = var.zone_name
    }
    ```
  </Tab>
</Tabs>

## Step 4. Initialize Terraform

From the project directory, run:

```bash theme={null}
terraform init
```

This downloads the Gcore provider and prepares the working directory.

## 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:

```bash theme={null}
terraform workspace new preprod
terraform workspace new production
```

## Step 6. Apply the configuration

Switch to the preproduction workspace and apply the configuration:

```bash theme={null}
terraform workspace select preprod
terraform apply -var-file=preprod.tfvars
```

Then switch to the production workspace and apply the configuration there as well:

```bash theme={null}
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.