terraform-webserver.tf

# Elemets of the cloud such as virtual servers,
# networks, firewall rules are created as resources
# syntax is: resource RESOURCE_TYPE RESOURCE_NAME
# https://www.terraform.io/docs/configuration/resources.html

resource "google_compute_firewall" "backend_rules" {
  name    = "backend-rules"
  network = "default"

  allow {
    protocol = "tcp"
    ports = ["80", "443", "5432"]
  }

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

# create the backend server 1
resource "google_compute_instance" "webserver1" {
    name = "web1"
    machine_type = "${var.GCP_MACHINE_TYPE}"
    zone = "${var.GCP_REGION}"

    boot_disk {
        initialize_params {
        # image list can be found at:
        # https://cloud.google.com/compute/docs/images
        image = "ubuntu-os-cloud/ubuntu-1604-lts"
        }
    }

    network_interface {
        network = "default"
        access_config {
        }
    }
  tags = ["web"]
}


output "web1" {
    value = "${join(" ", google_compute_instance.webserver1.*.network_interface.0.access_config.0.assigned_nat_ip)}"
}

# create the backend server 2
resource "google_compute_instance" "webserver2" {
    name = "web2"
    machine_type = "${var.GCP_MACHINE_TYPE}"
    zone = "${var.GCP_REGION}"

    boot_disk {
        initialize_params {
        # image list can be found at:
        # https://cloud.google.com/compute/docs/images
        image = "ubuntu-os-cloud/ubuntu-1604-lts"
        }
    }

    network_interface {
        network = "default"
        access_config {
        }
    }
  tags = ["web"]
}

output "web2" {
    value = "${join(" ", google_compute_instance.webserver2.*.network_interface.0.access_config.0.assigned_nat_ip)}"
}


# create the backend server 3
resource "google_compute_instance" "webserver3" {
    name = "web3"
    machine_type = "${var.GCP_MACHINE_TYPE}"
    zone = "${var.GCP_REGION}"

    boot_disk {
        initialize_params {
        # image list can be found at:
        # https://cloud.google.com/compute/docs/images
        image = "ubuntu-os-cloud/ubuntu-1604-lts"
        }
    }

    network_interface {
        network = "default"
        access_config {
        }
    }
  tags = ["web"]
}

output "web3" {
    value = "${join(" ", google_compute_instance.webserver3.*.network_interface.0.access_config.0.assigned_nat_ip)}"
}

# create the backend db server 
resource "google_compute_instance" "dbserver" {
    name = "dbserver"
    machine_type = "${var.GCP_MACHINE_TYPE}"
    zone = "${var.GCP_REGION}"

    boot_disk {
        initialize_params {
        # image list can be found at:
        # https://cloud.google.com/compute/docs/images
        image = "ubuntu-os-cloud/ubuntu-1604-lts"
        }
    }

    network_interface {
        network = "default"
        access_config {
        }
    }
  tags = ["dbservers"]
}

output "dbserver" {
    value = "${join(" ", google_compute_instance.dbserver.*.network_interface.0.access_config.0.assigned_nat_ip)}"
}