How to Create a VPC in GCP: Step-by-Step Guide

To create a VPC in GCP, use the gcloud compute networks create command with a network name and subnet mode. This sets up a private network where you can launch your cloud resources securely.

Syntax

The basic command to create a VPC network in GCP is:

gcloud compute networks create NETWORK_NAME --subnet-mode=MODE

Where:

• NETWORK_NAME: Your chosen name for the VPC network.
• --subnet-mode: Defines how subnets are created. Common modes are auto (automatic subnets in each region) or custom (you create subnets manually).

bash

gcloud compute networks create NETWORK_NAME --subnet-mode=MODE

Example

This example creates a custom mode VPC named my-vpc. Custom mode means you will add subnets yourself later.

bash

gcloud compute networks create my-vpc --subnet-mode=custom

Output

Created [https://www.googleapis.com/compute/v1/projects/PROJECT_ID/global/networks/my-vpc].

Common Pitfalls

Common mistakes when creating VPCs include:

• Using auto subnet mode when you want full control over subnets.
• Not specifying a unique network name, causing conflicts.
• Forgetting to create subnets in custom mode, which means no usable IP ranges.

Always plan your subnet ranges before creating a custom VPC.

bash

## Wrong: Creating custom VPC but no subnets added

gcloud compute networks create my-vpc --subnet-mode=custom

## Right: Add subnet after creating custom VPC

gcloud compute networks create my-vpc --subnet-mode=custom
gcloud compute networks subnets create my-subnet --network=my-vpc --region=us-central1 --range=10.0.0.0/24

Quick Reference

Tips for creating VPCs in GCP:

• Use auto subnet mode for quick setup with default subnets.
• Use custom subnet mode for precise control over IP ranges and regions.
• Always name your network clearly to avoid confusion.
• Create subnets immediately after custom VPC creation.

Key Takeaways

Use the gcloud command with --subnet-mode to create a VPC network in GCP.

Choose 'auto' mode for automatic subnets or 'custom' mode to manage subnets yourself.

Always create subnets after a custom mode VPC to have usable IP ranges.

Pick unique and clear network names to avoid conflicts.

Plan your IP ranges before creating custom VPCs to prevent overlap.