A layer-7 load balancer distributes HTTP requests using application details such as URI paths and hostnames. In Kubernetes, an Ingress places multiple internal Services behind one external IP, allowing one public domain or IP to serve several services. section 7.2
Ingress can route requests by:
- Path, such as / for one Service and /robohash for another. section 7.2
- Hostname, such as timeserver.example.com and robohash.example.com. section 7.2
- Both hostname and path when the routing rules require it. section 7.2
Two applications behind one IP
An Ingress can send / to timeserver-internal and /robohash to robohash-internal. These internal Services use NodePort, while the Ingress exposes a shared external address.
Figure 7.4 The Ingress’s rule list, or URL map, allows one HTTP load balancer to handle the traffic for multiple services.
The URL-map diagram shows how one HTTP load balancer directs traffic to multiple Services. section 7.2
