Is there a way url redirect internally to particular service based on context path? - kubernetes

Question

There are multiple same pods running in one cluster but different namespaces. This is the web application running in Kubernetes. I have the URL <HOSTNAME>:<PORT>/context/abc/def/...... I want to redirect to particular service based on the context. Is there a way i can achieve it using ingress controller ? Or Is there any way i can achieve it using different ports through ingress ?
My web application works fine if the URL is <HOSTNAME>:<PORT>/abc/def/...... Since i have to access the different pods using the same URL, I am adding context to it. Do we have any other way to achieve this use case ?

Answer 1

You can do that with rewrite-target. In example below i used <HOSTNAME> value of rewrite.bar.com and <PORT> with value 80.
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
annotations:
nginx.ingress.kubernetes.io/rewrite-target: /$2
name: rewrite
namespace: default
spec:
rules:
- host: rewrite.bar.com
http:
paths:
- backend:
serviceName: context-service
servicePort: 80
path: /context1(/|$)(.*)
- backend:
serviceName: context-service2
servicePort: 80
path: /context2(/|$)(.*)
For example, the ingress definition above will result in the following rewrites:
rewrite.bar.com/context1 rewrites to rewrite.bar.com/ for context 1 service.
rewrite.bar.com/context2 rewrites to rewrite.bar.com/ for context 2 service.
rewrite.bar.com/context1/new rewrites to rewrite.bar.com/new for context 1 service.
rewrite.bar.com/context2/new rewrites to rewrite.bar.com/new for context 2 service.

Answer 2

You can manage how the traffic is pointed to the correct service by using the rules configuration of the ingress, here is a simple example from the documentation:
apiVersion: networking.k8s.io/v1beta1
kind: Ingress
metadata:
name: app-ingress
spec:
rules:
- http:
paths:
- path: /abc
backend:
serviceName: abc-service
servicePort: 80
- path: /context
backend:
serviceName: context-service
servicePort: 80