Deploying Multiple Ingress Controllers in a Kubernetes Cluster

If you’re running multiple ingress controllers in a single Kubernetes cluster, you need to specify the annotation kubernetes.io/ingress.class: "controller-name" in all ingresses that you would like the ingress-nginx controller to claim.

If you only need to accessing service 1 from a particular Nginx Controller, you can define that when deploying the ingress resource specify to service 1.

To achieve above, configuration changes would be as follows,

Ingress- resource :

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: hello-world
  annotations:
    kubernetes.io/ingress.class: "nginx-internal"
spec:
  tls:
  - secretName: tls-secret
  rules:
  - http:
      paths:
      - backend:
          serviceName: hello-world-svc
          servicePort: 8080

on the above, you can see the ingress class is defined as “nginx-internal”. So you need to define one of your Nginx controllers to have the class name as “nginx-internal” to route the traffic.

Ingress-controller:

spec:
  template:
     spec:
       containers:
         - name: nginx-ingress-internal-controller
           args:
             - /nginx-ingress-controller
             - '--election-id=ingress-controller-leader-internal'
             - '--ingress-class=nginx-internal'
             - '--configmap=ingress/nginx-ingress-internal-controller'

Here you need to set the ‘ingress-class’ argument name as the same as in ingress-resource. In my case, it is “nginx-internal”.

This way you can even have an ingress controller per namespace as well.

Hope this helps !!!