How to Setup Google Cloud External Load Balancer (HTTP/HTTPS Tutorial) - Part 9
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🔥 Google Cloud External Load Balancer | Complete Setup Tutorial
Build a production-ready External HTTP(S) Load Balancer on GCP using Terraform with
auto-healing and managed instance groups.
🏗️ Architecture:
Internet → Global External IP → HTTP Proxy → URL Map → Backend Service → Managed Instance
Group (2 VMs)
📋 What You'll Learn:
1️⃣ VPC & Subnet - Using existing custom VPC (10.100.0.0/16) and public subnet from Chapter 2
2️⃣ Instance Template - Reusable VM template with nginx, e2-micro, Debian 11, startup script
3️⃣ Managed Instance Group (MIG) - Auto-managed 2 instances, auto-healing enabled, rolling
updates
4️⃣ Health Checks - HTTP check on /health endpoint, 5sec interval, 2 threshold
5️⃣ Firewall Rules - Allow health checks (35.191.0.0/16, 130.211.0.0/22) + web traffic
(0.0.0.0/0 port 80)
6️⃣ Backend Service - 80% max utilization, connection draining 300s, no session affinity
7️⃣ URL Map & HTTP Proxy - Routes requests to backend service
8️⃣ Global Forwarding Rule - Provides single external IP accessible worldwide
9️⃣ Testing - curl to external IP, verify load distribution across instances
🔑 Key Points:
✅ Global external IP - same IP worldwide
✅ Auto-healing replaces unhealthy VMs automatically
✅ MIG ensures consistent instance configuration
✅ Health checks route traffic only to healthy backends
🎯 Use Cases: Public websites, APIs, internet-facing applications
🛠️ Tools: Terraform, GCP, nginx, Managed Instance Groups
📁 Code: [GitHub Repo Link]
⏱️ Topics:
Introduction
Instance Template Setup
Managed Instance Group
Health Checks & Firewall
Backend Service
URL Map & HTTP Proxy
Global Forwarding Rule
Testing & Verification
📌 Like 👍 | Subscribe 🔔 | Comment below!
#GoogleCloud #GCP #LoadBalancer #Terraform #DevOps #CloudComputing
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