In its simplest form, a GSLB is a DNS server. It tells clients looking for www.snapt.net to go to an IP address which is normally your load balancer (or even a single web server).
What happens when you have a DR site, or an American and European site? You need a way to send users to both and to check the health of both. However, a load balancer is an on-site only option, you need something that survives a total site failure.
This is when you add a GSLB. It’s an intelligent DNS server that replies with online sites, and based on rules. You can give certain servers increased weights, route certain locations to certain datacenters (such as American clients to the US), and do advanced health checks to ensure you only send users to online locations.
It’s all about keeping your service online and available, while making sure it performs quickly and efficiently.
The Snapt GSLB is a DNS-based load balancing service for geographically distant infrastructures. It performs health checking, nearest host routing and more.