How can a secondary IP range be added to a subnetwork after it has been created using Terraform on GCP?

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To add a secondary IP range to a subnetwork after it has been created using Terraform on GCP, the following steps will be necessary:

1. Identify the existing subnetwork resource in your Terraform configuration file.

   resource "google_compute_subnetwork" "example" {
    name                     = "example-subnet"
    ip_cidr_range            = "10.0.1.0/24"
    network                  = google_compute_network.example.self_link
    region                   = "us-central1"
    private_ip_google_access = true
   }
   

2. Add a secondaryiprange block inside the subnetwork resource.

   resource "google_compute_subnetwork" "example" {
    name                     = "example-subnet"
    ip_cidr_range            = "10.0.1.0/24"
    network                  = google_compute_network.example.self_link
    region                   = "us-central1"
    private_ip_google_access = true
   
    secondary_ip_range {
      range_name    = "example-range"
      ip_cidr_range = "10.0.2.0/24"
    }
   }
   

3. Save the changes to the Terraform configuration file.

4. Run the terraform apply command to apply the changes to the GCP environment.

   $ terraform apply
   

After these steps are completed, the secondary IP range will be added to the existing subnetwork.