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Lab 5 - Ingress

In the previous exercise, you have exposed the whoami application internally using a service of type ClusterIP. Now you want to go public and open your application to external clients. One way to do this is by using a Kubernetes Ingress.

Ingress exposes HTTP and HTTPS routes from outside the cluster to services within the cluster. To be able to create Ingress objects in your cluster, you need to first install an Ingress Controller. You will use Traefik, a powerful Ingress Controller and reverse proxy (https://containo.us/traefik/)

Ingress Controller

  • Activate the ingress addon:
minikube addons enable ingress
  • Wait for the controller to be ready by running the following command:
kubectl wait --namespace ingress-nginx\
  --for=condition=ready pod \
  --selector=app.kubernetes.io/component=controller\
  --timeout=90s
  • Display all objects created in the ingress-nginx Namespace with the following command:
kubectl get pod,svc,deploy,rs,job -n ingress-nginx
  • Expose the Ingress Controller:
docker container run --name expose-ingress-controller --detach --network minikube --publish 80:80 alpine/socat tcp-listen:80,fork,reuseaddr tcp-connect:minikube:80

Ingress whoami

  • Edit the file tp5-whoami-ingress.yml in order to replace FIXME with the public IP of yourmachine: ${PUBLIC_IP}
  • Expose the whoami Service by an Ingress which will have to respond on the url whoami.FIXME.sslip.io
kubectl apply -f tp5-whoami-ingress.yml

  • Check that the Ingress is correctly configured with kubectl get ingress

  • Test the url http://whoami.FIXME.sslip.io/, check by refreshing the page that you arrive alternately on the different Pods of the Service (see Hostname)

  • Observe the logs of the Pod ingress-nginx-controller-... of the Namespace ingress-nginx

Conclusion

Congratulations ! you have successfully deployed your application on Kubernetes and made it public !

Enjoy !