Deploy multiple ingress controllers on a cluster

Deploy a second NGINX ingress controller

You can perform the following steps to deploy an independent NGINX ingress controller to a cluster.

1. Log on to the ACK console.
2. In the left-side navigation pane, choose Marketplace > App Catalog.
3. On the Alibaba Cloud Apps tab, click ack-ingress-nginx.
4. On the App Catalog - ack-ingress-nginx page, click the Parameters tab. In the Deploy section, specify a cluster, a namespace, and a release name, and click Create.
   The following table describes the parameters.

   Parameter	Description
   controller.image.repository	The image repository of ingress-nginx. If the cluster is deployed in a region outside China, we recommend that you set this parameter to the region ID.
   controller.image.tag	The image version of ingress-nginx. For more information, see Release notes for Ingress-NGINX.
   controller.ingressClass	The ingress class of the ingress controller. The ingress controller handles only the ingress resources that are annotated with the ingress class. Notice In a cluster, the ingress class of each ingress controller must be unique. The ingress class of the default ingress controller in a cluster is nginx. Therefore, do not set this parameter to nginx.
   controller.replicaCount	The number of pod replicas of the ingress controller.
   controller.publicService.enabled	Specifies whether to use a public-facing SLB instance for load balancing. If you do not want to use a public-facing SLB instance, set the value to false.
   controller.privateService.enabled	Specifies whether to use an internal SLB instance for load balancing. If you want to use an internal SLB instance, set this parameter to true.
   controller.kind	The deployment mode of the ingress controller. Valid values: Deployment and DaemonSet.

   In the left-side navigation pane of the ACK console, click Clusters. On the Clusters page, find the cluster that you want to view, and click Applications in the Actions column. The details page of the cluster appears. In the left-side navigation pane, click Releases. On the Helm tab, view the newly deployed ingress controller.

Test the connectivity

The following example deploys a test application and uses the newly deployed NGINX ingress controller to provide application services for external users.

1. Deploy an NGINX application.

   apiVersion: extensions/v1beta1
   kind: Deployment
   metadata:
     name: nginx
   spec:
     replicas: 1
     selector:
       matchLabels:
         run: nginx
     template:
       metadata:
         labels:
           run: nginx
       spec:
         containers:
         - image: nginx
           imagePullPolicy: Always
           name: nginx
           ports:
           - containerPort: 80
             protocol: TCP
         restartPolicy: Always
   ---
   apiVersion: v1
   kind: Service
   metadata:
     name: nginx
   spec:
     ports:
     - port: 80
       protocol: TCP
       targetPort: 80
     selector:
       run: nginx
     sessionAffinity: None
     type: NodePort

2. Use the NGINX ingress controller to provide application services for external users.

   apiVersion: extensions/v1beta1
   kind: Ingress
   metadata:
     name: nginx
     annotations:
       # Set the value to the ingress class of the new NGINX ingress controller.
       kubernetes.io/ingress.class: "<YOUR_INGRESS_CLASS>"
   spec:
     rules:
     - host: foo.bar.com
       http:
         paths:
         - path: /
           backend:
             serviceName: nginx
             servicePort: 80

   Note You must configure the kubernetes.io/ingress.class annotation.
   After you deploy the application, the ingress IP address is the same as the IP address of the new NGINX ingress controller.

    kubectl -n kube-system get svc nginx-ingress-lb

   NAME               TYPE           CLUSTER-IP    EXTERNAL-IP    PORT(S)                      AGE
   nginx-ingress-lb   LoadBalancer   172.19.7.30   47.95.97.115   80:31429/TCP,443:32553/TCP   2d

   kubectl -n <YOUR_NAMESPACE> get svc nginx-ingress-lb

   NAME               TYPE           CLUSTER-IP     EXTERNAL-IP     PORT(S)                      AGE
   nginx-ingress-lb   LoadBalancer   172.19.6.227   39.105.252.62   80:30969/TCP,443:31325/TCP   39m

   kubectl get ing

   NAME      HOSTS         ADDRESS         PORTS     AGE
   nginx     foo.bar.com   39.105.252.62   80        5m

3. Access the application through the default and new NGINX ingress controllers.

    # Access the application through the default NGINX ingress controller. The 404 status code is expected.
     curl -H "Host: foo.bar.com" http://47.95.97.115
   default backend - 404                                                                                                                                                                                        
     # Access the application through the new NGINX ingress controller. The NGINX welcome page is expected. curl -H "Host: foo.bar.com" http://39.105.252.62
   <! DOCTYPE html>
   <html>
   <head>
   <title>Welcome to nginx! </title>
   <style>
       body {
           width: 35em;
           margin: 0 auto;
           font-family: Tahoma, Verdana, Arial, sans-serif;
       }
   </style>
   </head>
   <body>
   <h1>Welcome to nginx! </h1>
   <p>If you see this page, the nginx web server is successfully installed and
   working. Further configuration is required.</p>
   
   <p>For online documentation and support please refer to
   <a href="http://nginx.org/">nginx.org</a>.<br/>
   Commercial support is available at
   <a href="http://nginx.com/">nginx.com</a>.</p>
   
   <p><em>Thank you for using nginx.</em></p>
   </body>
   </html>

The preceding tests show that application services accessed through different NGINX ingress controllers do not interfere each other. This solution applies to scenarios where some services must be available to external users, but other services only allow requests from non-Kubernetes workloads in the same VPC.