High Availability

Global Server Load Balancing steers users to the right data centre before a connection is ever made — using nothing more exotic than DNS. How it works, what it’s for, and how it fits alongside your local load balancers.

A load balancer that protects you from server failures but has no failover of its own is a liability. How active-passive HA with VRRP works, what actually happens during failover, and how to set up a pair.