GoSLB - DNS load balancer

!! This is a work-in-progress repo !!

GoSLB is multi-site DNS load-balancer with a RESTful API and etcd backend. The basic configuration unit is a service (DNS domain) with a list of endpoints (IP addresses) and a TCP or a HTTP health monitor. Each endpoint can be assigned to a site (datacenter, cloud region, ...) and, based on provided site's IP ranges, local-site endpoints are preferred in the DNS responses to clients.

Quick start

To get a demo instance running quickly, have a look at the simple docker example.

Endpoint selection

Algorithm that chooses the list of endpoints to return to the client is based on enabled/disabled state, priority, health (as reported by monitor) and site affiliation:

1. Only enabled healthy endpoints are considered
2. If there are enabled & healthy endpoints with different priorities, only the highest priority ones are considered
3. If there are highest-priority endpoints in multiple sites, one of them being the client's local site, only local site endpoints are returned, otherwise all sites' endpoints are returned
4. The endpoints are returned in random order (if there are more than 3 candidates, random 3 are returned)

Configuration

TODO

API Example

For full API reference see: https://goslb.docs.apiary.io/