Cloud Load Balancing
Definition
Google's global load balancing service that distributes traffic across regions, ensuring high availability and performance for applications.
Use Cases
- Google: Serving global web traffic with low latency and high availability — Google uses global load balancing concepts (anycast IPs, health checks, and traffic steering) to route users to healthy, nearby backends across regions and data centers. (Improved user experience through lower latency and resilient service delivery during regional failures.)
- Spotify: Delivering a globally available web and API experience to users in many countries — Spotify has publicly discussed using Google Cloud for parts of its infrastructure; global traffic management patterns such as multi-region routing, health checks, and failover are commonly implemented using global load balancing capabilities. (Better availability and performance for users by routing traffic to healthy infrastructure and scaling during demand spikes.)
Provider Equivalents
- AWS: Elastic Load Balancing (ELB) with AWS Global Accelerator (as needed for global routing)
- Azure: Azure Front Door (global) and Azure Load Balancer (regional)
- GCP: Cloud Load Balancing
- OCI: OCI Load Balancer (regional) with OCI Traffic Management (DNS-based global steering)
Frequently Asked Questions
- What's the difference between Cloud Load Balancing and Cloud CDN?
- Cloud Load Balancing routes requests to the best backend service (like VM instances, Kubernetes services, or serverless backends) based on health, capacity, and location. Cloud CDN caches content at edge locations so repeat requests can be served faster without always reaching your backends. Many architectures use both: the load balancer as the front door, and CDN caching in front of or integrated with it for static and cacheable content.
- When should I use Cloud Load Balancing?
- Use it when you need to distribute traffic across multiple backends for reliability, scale, or performance. Common triggers include: you have users in multiple regions and want them routed to the closest healthy backend; you need automatic failover if a zone or region goes down; you want to scale horizontally behind a single IP/hostname; or you need advanced traffic controls like SSL termination, health checks, and traffic splitting.
- How much does Cloud Load Balancing cost?
- Pricing depends on the load balancer type (HTTP(S), TCP/SSL, internal), the amount of data processed, and the number of forwarding rules or proxies used. You may also pay for related features such as Cloud CDN, SSL certificates (if applicable), and outbound data transfer from backends. For accurate estimates, use the Google Cloud Pricing Calculator and model expected requests/throughput and regions.
Category: networking
Difficulty: intermediate
See Also