day5 Terraform GCP VPC (下)

2023 iThome 鐵人賽

DAY 5

IT管理

GCP 的 terraform 之旅系列第 5 篇

15th鐵人賽

leon123858

團隊Bare Metal People

2023-09-20 02:14:33

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簡介

今天解釋一下昨天撰寫的程式碼

正文

provider "google" {
  project = var.project_id
  region  = var.region
}

# 創建一個 VPC 本體
resource "google_compute_network" "securenetwork" {
  name                    = "securenetwork"
  auto_create_subnetworks = "false"
}

# 在 VPC 內添加一個子網
resource "google_compute_subnetwork" "securenetwork" {
	# 要先確認 VPC 被建立
  depends_on    = [google_compute_network.securenetwork]
  name          = "securenetwork"
  region        = var.region
  network       = google_compute_network.securenetwork.self_link
  ip_cidr_range = "10.130.0.0/20"
}

# 創建一個 VPC 內的防火牆, 允許任意連線, 用 tcp:22 連到帶有特定 tag 的網內主機
resource "google_compute_firewall" "bastionbost-allow-iap" {
	# 要確認 VPC 建立
  depends_on    = [google_compute_network.securenetwork]
  name          = "bastionbost-allow-iap"
  network       = google_compute_network.securenetwork.self_link
  source_ranges = ["0.0.0.0/0"]
  target_tags   = ["bastion"]
  allow {
    protocol = "tcp"
    ports    = ["22"]
  }
}

# 指定特定範圍內的主機連入內網任意電腦的網頁(port：80)
resource "google_compute_firewall" "securenetwork-allow-http" {
	# 要確認 VPC 建立
  depends_on    = [google_compute_network.securenetwork]
  name          = "securenetwork-allow-http"
  network       = google_compute_network.securenetwork.self_link
  source_ranges = ["10.130.0.0/20"]

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

# 安全機(只能被特定內網 acccess)
resource "google_compute_instance" "safe_instance" {
	# 建立到子網, 所以要確認子網已被建立
  depends_on   = [google_compute_subnetwork.securenetwork]
  name         = "secure"
  zone         = var.zone
  machine_type = "e2-medium"
  tags         = ["secure"]

  metadata = {
    startup-script = "#! /bin/bash \n apt update \n apt -y install apache2 \n cat <<EOF > /var/www/html/index.html \n <html><body><p>Linux startup script added directly.</p></body></html> \n EOF"
  }

  boot_disk {
    initialize_params {
      image = "projects/debian-cloud/global/images/debian-11-bullseye-v20230814"
      size  = 20
      type  = "pd-balanced"
    }
  }
  network_interface {
    subnetwork = google_compute_subnetwork.securenetwork.self_link
    access_config {
      # Allocate a one-to-one NAT IP to the instance
    }
  }
}

# 堡壘機
resource "google_compute_instance" "bastion_instance" {
  depends_on   = [google_compute_network.securenetwork]
  name         = "bastion"
  zone         = var.zone
  machine_type = "e2-micro"
	# 利用 tag 適配防火牆規則
  tags         = ["bastion"]

  boot_disk {
    initialize_params {
      image = "projects/debian-cloud/global/images/debian-11-bullseye-v20230814"
      size  = 20
      type  = "pd-balanced"
    }
  }
  network_interface {
    subnetwork = google_compute_network.securenetwork.self_link
    access_config {
      # Allocate a one-to-one NAT IP to the instance
    }
  }
}