Exercise

Exercise : Ingress¶

Install the Traefik Ingress Controller

Info

We use Helm, the Kubernetes package manager, to install Traefik. We'll detail the usage of Helm in a next section.

First get the Helm Client:

curl -fsSL -o get_helm.sh https://raw.githubusercontent.com/helm/helm/main/scripts/get-helm-3
chmod 700 get_helm.sh
./get_helm.sh

Then install Traefik:

helm repo add traefik https://traefik.github.io/charts
helm install traefik traefik/traefik --version 31.0.0 -n traefik --create-namespace

This will create Traefik Pods and expose them with a Service of type load-balancer. Get the external IP of this load-balancer as we will need it in the next part. This IP can be retrieved: - from the details of the Traefik Service

$ kubectl get service -n traefik
NAME      TYPE           CLUSTER-IP     EXTERNAL-IP    PORT(S)                      AGE
traefik   LoadBalancer   10.97.184.29   85.217.161.3   80:32426/TCP,443:32198/TCP   76s

from the Exoscale console

Console

In this example the external IP of the load balancer is 85.217.161.3

In a file named ingress.yaml, define the specification for an Ingress resource with the following characteristics:
- Name: vote
- ingressClassName: traefik
- All requests to the URL vote.votingapp.com should be redirected to port 80 of the vote-ui service
- All requests to the URL result.votingapp.com should be redirected to port 80 of the result-ui service
Update your /etc/hosts file so that the URLs vote.votingapp.com and result.votingapp.com resolve to the IP address of the Ingress Controller (the one you get before)

Then you should modify your /etc/hosts file to add the following entry:
```
...
IP_OF_YOUR_VM vote.votingapp.com result.votingapp.com
```
Tip

If you do not have the necessary permissions to modify your /etc/hosts file, you can use the nip.io service and set the domain names vote.IP_OF_YOUR_VM.nip.io / result.IP_OF_YOUR_VM.nip.io instead of vote.votingapp.com / result.votingapp.com in your Ingress resource definition.
Deploy the application and verify that the vote interface is available at http://vote.votingapp.com and the result interface is available at http://result.votingapp.com (or at http://vote.IP_OF_YOUR_VM.nip.io / http://result.IP_OF_YOUR_VM.nip.io if you are using the nip.io approach).
Delete the application.

Tip

The specification for the Ingress resource is as follows:

ingress.yaml

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
name: vote
spec:
ingressClassName: traefik
rules:
- host: vote.votingapp.com
  http:
    paths:
    - path: /
      pathType: Prefix
      backend:
        service:
          name: vote-ui
          port:
            number: 80
- host: result.votingapp.com
  http:
    paths:
    - path: /
      pathType: Prefix
      backend:
        service:
          name: result-ui
          port:
            number: 80

Deploy the application with the following command from the manifests directory:
```
kubectl apply -f .
```
You can then access the different interfaces using real domain names instead of a port number.
Delete the application with the following command from the manifests directory:
```
kubectl delete -f .
```