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GCP Load Balancing

Global HTTP(S) LB with anycast IP, Cloud CDN, and backend services across regions.

GCPAdvanced

Why

GCP HTTP(S) LB is global — one anycast IP routes to nearest region. Integrates CDN, Cloud Armor, and IAP. $0.011/GB + $0.025/first 5 rules.

No regional LB needed for global apps.

When

Use for any public web app/API. Internal LB for private services. Network LB for non-HTTP (TCP/UDP).

How

1. Backend service — MIG, Cloud Run, GKE, or bucket 2. URL map — path/host routing to backends 3. Target proxy — HTTP or HTTPS (with cert) 4. Forwarding rule — global anycast IP 5. Health checks — HTTP/HTTPS/TCP, configure thresholds 6. Autoscaling — MIG scales on LB metrics 7. Multi-region — backends in US + EU, LB routes to nearest 8. IAP — Identity-Aware Proxy, auth before reaching backend

Example

# Global HTTP LB with multi-region backends gcloud compute backend-services create web-backend \ --global --enable-cdn \ --health-checks web-hc gcloud compute backend-services add-backend web-backend \ --instance-group us-mig --instance-group-region us-central1 \ --balancing-mode UTILIZATION --max-utilization 0.8 gcloud compute url-maps create web-map \ --default-service web-backend gcloud compute target-http-proxies create web-proxy \ --url-map web-map gcloud compute forwarding-rules create web-fr \ --global --target-http-proxy web-proxy --ports 80

Common Problems

  • ⚠Health check too strict — 1 failure = unhealthy, set healthy/unhealthy thresholds
  • ⚠Backend in one region — no HA, add multi-region backends
  • ⚠Cert management — use Google-managed certs, auto-renew

Best Practices

  • ✓Use global LB for global apps — one IP, routes to nearest region
  • ✓Google-managed certs — auto-renew, no manual management
  • ✓Enable Cloud CDN + Armor — caching + WAF on same LB, no extra hops

FAQ

What is GCP Load Balancing and what problem does it solve?

Global HTTP(S) LB with anycast IP, Cloud CDN, and backend services across regions. It lets developers deploy, store, and scale without self-managing infrastructure — a core reference for cloud service selection.

How do I get started with GCP Load Balancing in 5 minutes?

Two steps to run it: (1) Backend service — MIG, Cloud Run, GKE, or bucket; (2) URL map — path/host routing to backends. Validate on the free tier first, then wire into production.

What is the #1 pitfall with GCP Load Balancing?

The most frequent issue is: Health check too strict — 1 failure = unhealthy, set healthy/unhealthy thresholds. Run a pre-launch checklist item by item, and add policy/config scanning in CI.

What are the best practices for GCP Load Balancing?

Best practices for GCP Load Balancing include: Use global LB for global apps — one IP, routes to nearest region; Google-managed certs — auto-renew, no manual management; Enable Cloud CDN + Armor — caching + WAF on same LB, no extra hops. The first one — "Use global LB for global apps — one IP, routes to nearest region" — should be a team default baked into your IaC templates.

How do I control cost and avoid bill surprises with GCP Load Balancing?

Three ways to prevent overspend: (1) tag every resource with env/team and enable billing alarms; (2) set budget thresholds to trigger Slack/email alerts; (3) review idle resources in Cost Explorer regularly and clean them up. Most GCP Load Balancing options offer a free tier — validate within free quota before scaling.