GCP Landing Zone

A Google Cloud Landing Zone is a secure, scalable, and policy-driven GCP environment that provides a foundation for cloud adoption. It enables organizations to deploy workloads with governance, security, and compliance from day one, using best practices and automation.

---

What is a GCP Landing Zone?

• A pre-configured GCP environment with hierarchical resource organization (folders, projects, billing accounts)

• Implements guardrails using IAM, Organization Policies, and centralized logging

• Automates project creation, baseline networking (VPCs), and security controls

References:

• GCP Landing Zone Foundation

• Google Cloud Security Foundations Guide

---

Real-Life Use Cases

• Enterprise Cloud Adoption: Standardize environments for multiple teams or business units

• Regulated Industries: Enforce compliance (e.g., GDPR, HIPAA) with automated guardrails

• Startups/Scale-ups: Rapidly scale with secure, repeatable project structures

---

Configuration Options

• Resource Hierarchy: Organization, folders, projects, billing accounts

• Networking: Shared VPCs, subnets, firewall rules, Private Google Access

• Security: IAM roles, Organization Policies, Cloud Audit Logs, Security Command Center

• Automation: Use Terraform, Deployment Manager, or gcloud CLI

---

Example: GCP Landing Zone with Terraform

Below is a simplified example using Terraform to create a GCP organization folder, project, and baseline IAM policies.

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

resource "google_folder" "engineering" {
  display_name = "Engineering"
  parent       = "organizations/${var.org_id}"
}

resource "google_project" "app" {
  name       = "app-project"
  project_id = var.project_id
  org_id     = var.org_id
  folder_id  = google_folder.engineering.id
}

resource "google_project_iam_member" "no_public_bucket" {
  project = google_project.app.project_id
  role    = "roles/storage.objectViewer"
  member  = "group:[e-mail]"
}

resource "google_organization_policy" "restrict_bucket_public_access" {
  org_id = var.org_id
  constraint = "constraints/storage.publicAccessPrevention"
  boolean_policy {
    enforced = true
  }
}

Tip: Use variables for organization IDs, project IDs, and regions for reusability.

---

Example: Terraform Test with terraform-compliance

You can use terraform-compliance to test your Terraform code for security and compliance. Example test to ensure public access to storage buckets is prevented:

Feature: Prevent Public Access to GCS Buckets
  Scenario: Ensure GCS buckets have public access prevention enabled
    Given I have google_storage_bucket defined
    Then it must contain public_access_prevention
    And its public_access_prevention must be "enforced"

---

Notes for Linux, WSL, and NixOS Users

• Linux: Use the latest Terraform binary and Google Cloud SDK. Install via your package manager or official releases.
• WSL: Ensure your GCP credentials are accessible in your WSL home directory. Use wsl --mount for shared filesystems if needed.

• NixOS: Use nixpkgs for reproducible installs:

  environment.systemPackages = with pkgs; [ terraform google-cloud-sdk ];

• Always use environment variables or gcloud auth application-default login for credentials—never hard-code secrets.

---

Landing Zone Joke

Why did the DevOps engineer refuse to deploy in an unprepared GCP project?

Because there was no landing zone—he didn’t want to fall into the cloud!

---

For more advanced patterns, see the GCP Security Foundations Guide and Terraform GCP modules.