TP_Cloud/terraform/modules/network/main.tf

resource "google_compute_network" "vpc" {
  name                    = "vpcsim"
  auto_create_subnetworks = false
}

resource "google_compute_subnetwork" "frontend" {
  name          = "frontend"
  network       = google_compute_network.vpc.id
  ip_cidr_range = var.frontend_cidr
  region        = var.region
}

resource "google_compute_subnetwork" "backend" {
  name          = "backend"
  network       = google_compute_network.vpc.id
  ip_cidr_range = var.backend_cidr
  region        = var.region
}

resource "google_compute_subnetwork" "database" {
  name          = "database"
  network       = google_compute_network.vpc.id
  ip_cidr_range = var.database_cidr
  region        = var.region
}

resource "google_compute_firewall" "allowHttpHttps" {
  name    = "allowHttpHttps"
  network = google_compute_network.vpc.id

  allow {
    protocol = "tcp"
    ports    = ["80", "443"]
  }

  source_ranges = ["0.0.0.0/0"]
  target_tags   = ["web"]
}

resource "google_compute_firewall" "allowSsh" {
  name    = "allowSsh"
  network = google_compute_network.vpc.id

  allow {
    protocol = "tcp"
    ports    = ["22"]
  }

  source_ranges = var.ssh_source_ranges
  target_tags   = ["ssh"]
}

resource "google_compute_firewall" "frontToBack" {
  name    = "frontToBack"
  network = google_compute_network.vpc.id

  allow {
    protocol = "tcp"
    ports    = ["8000"]
  }

  source_ranges = var.frontend_cidr
  target_tags   = ["backend"]
}

resource "google_compute_firewall" "backToDb" {
  name    = "backToDb"
  network = google_compute_network.vpc.id

  allow {
    protocol = "tcp"
    ports    = ["3306"]
  }

  source_ranges = var.backend_cidr
  target_tags   = ["database"]
}