Using Kubernetes Ingress

Introduction

Kubernetes Ingress allows you to customize how external entities can interact with your Kubernetes applications via the network. This lab will allow you to exercise your knowledge of Kubernetes Ingress. You will use Ingress to open access from an existing service to an external server.

Solution

Log in to the server using the credentials provided:

ssh cloud_user@<PUBLIC_IP_ADDRESS>

Create a Service to Expose the web-auth Deployment

1. Check out the deployment:

   kubectl get deployment web-auth -o yaml
   

   Note the web-auth label on our Pods. We’ll use this label to select these Pods using our Service.

2. Create a web-auth-svc.yml file:

   vi web-auth-svc.yml
   

3. Paste the following YAML definitions:

   Note: To paste YAML directly into the Vi/Vim editor, first enter the command :set paste.

   apiVersion: v1
   kind: Service
   metadata:
     name: web-auth-svc
   spec:
     type: ClusterIP
     selector:
       app: web-auth
     ports:
       - name: http
         protocol: TCP
         port: 80
         targetPort: 80
   

4. Press Esc and enter :wq to save and exit.

5. Create the Service:

   kubectl create -f web-auth-svc.yml
   

Create an Ingress That Maps to the New Service

1. Create a web-auth-ingress.yml file:

   vi web-auth-ingress.yml
   

2. Add the following YAML definitions:

   Note: To paste YAML directly into the Vi/Vim editor, first enter the command :set paste.

   apiVersion: networking.k8s.io/v1
   kind: Ingress
   metadata:
     name: web-auth-ingress
   spec:
     rules:
     - http:
         paths:
         - path: /auth
           pathType: Prefix
           backend:
             service:
               name: web-auth-svc
               port:
                 number: 80
   

3. Press Esc and enter :wq to save and exit.

4. Create the Ingress:

   kubectl create -f web-auth-ingress.yml
   

5. Check the status of the Ingress:

   kubectl describe ingress web-auth-ingress
   

   Note the service endpoints in the Backends section of the output. You have successfully created an Ingress that maps to the backend Service.