Choosing a load balancer

This document helps you determine which Google Cloud load balancer best meets your needs.

To decide which load balancer best suits your implementation of Google Cloud, consider the following aspects of Cloud Load Balancing:

  • Global versus regional load balancing
  • External versus internal load balancing
  • Traffic type

For more information about these aspects, see Load balancing overview.

Flow chart

After you determine whether you need global or regional load balancing, external or internal load balancing, and what traffic type your load balancers must handle, use the following flow chart to determine which load balancers are available for your client, protocol, and network configuration.

Flow chart for choosing a load balancer (click to enlarge)
Flow chart for choosing a load balancer (click to enlarge)

Geographic control over where TLS is terminated

The external HTTP(S) load balancer and SSL proxy load balancer terminate Transport Layer Security (TLS) in locations that are distributed globally, so as to minimize latency between clients and the load balancer. If you require geographic control over where TLS is terminated, you should use Network Load Balancing instead, and terminate TLS on backends that are located in regions appropriate to your needs.

Summary of Google Cloud load balancers

The following table provides some specific information about each load balancer.

Load balancer type Traffic type Preserve Client IP Global or regional Load balancing scheme Load balancer destination ports Proxy or pass-through
External HTTP(S) HTTP or HTTPS No Global* EXTERNAL HTTP on 80 or 8080; HTTPS on 443 Proxy
Internal HTTP(S) HTTP or HTTPS No Regional INTERNAL_MANAGED HTTP on 80 or 8080; HTTPS on 443 Proxy
SSL Proxy TCP with SSL offload No Global* EXTERNAL 25, 43, 110, 143, 195, 443, 465, 587, 700, 993, 995, 1883, 5222 Proxy
TCP Proxy TCP without SSL offload No Global* EXTERNAL 25, 43, 110, 143, 195, 443, 465, 587, 700, 993, 995, 1883, 5222 Proxy
External Network TCP/UDP TCP or UDP Yes Regional EXTERNAL Any Pass-through
Internal TCP/UDP TCP or UDP Yes Regional INTERNAL Any Pass-through

*Global in Premium Tier. Regional in Standard Tier.

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