Configuring SNI for a LoadBalancer Service

Prerequisites

• A Kubernetes cluster is available and the cluster version meets the following requirements:
  • v1.23: v1.23.13-r0 or later
  • v1.25: v1.25.8-r0 or later
  • v1.27: v1.27.5-r0 or later
  • v1.28: v1.28.3-r0 or later
  • Other clusters of later versions

• You have created one or more SNI certificates in ELB and specified a domain name in these certificates.
• To create a cluster using commands, ensure kubectl is used. For details, see Connecting to a Cluster Using kubectl.

Using the CCE Console

1. Log in to the CCE console and click the cluster name to access the cluster console.
2. In the navigation pane, choose Services & Ingresses. In the upper right corner, click Create Service.
3. Configure Service parameters. In this example, only mandatory parameters required for using SNI are listed. For details about how to configure other parameters, see Using the Console.
   • Service Name: Specify a Service name, which can be the same as the workload name.
   • Service Type: Select LoadBalancer.
   • Selector: Add a label and click Confirm. The Service will use this label to select pods. You can also click Reference Workload Label to use the label of an existing workload. In the dialog box that is displayed, select a workload and click OK.
   • Load Balancer: Select a load balancer type and creation mode.
     • A load balancer can be dedicated or shared. To enable HTTP/HTTPS on the listener port of a dedicated load balancer, the type of the load balancer must be Application (HTTP/HTTPS) or Network (TCP/UDP) & Application (HTTP/HTTPS).
     • This section uses an existing load balancer as an example. For details about the parameters for automatically creating a load balancer, see Table 1.
   • Ports
     • Protocol: Select TCP. If you select UDP, HTTP and HTTPS will be unavailable.
     • Service Port: port used by the Service. The port number ranges from 1 to 65535.
     • Container Port: listener port of the workload. For example, Nginx uses port 80 by default.
     • Frontend Protocol: In this example, HTTPS must be enabled for the Service to use SNI. For a dedicated load balancer, to use HTTP/HTTPS, the type of the load balancer must be Application (HTTP/HTTPS).
   • Listener
     • Server Certificate: Select a server certificate as the default certificate.
     • SNI: Add an SNI certificate containing a domain name.

       If an SNI certificate cannot be found based on the domain name requested by the client, the server certificate will be returned by default.

4. Click OK.

Using kubectl

apiVersion: v1
kind: Service
metadata:
  name: test
  labels:
    app: test
  namespace: default
  annotations:
    kubernetes.io/elb.class: performance        # Load balancer type
    kubernetes.io/elb.id: 65318265-4f01-4541-a654-fa74e439dfd3  # ID of an existing load balancer
    kubernetes.io/elb.protocol-port: https:80    # Port where SNI is to be enabled
    kubernetes.io/elb.cert-id: b64ab636f1614e1a960b5249c497a880    # HTTPS server certificate
    kubernetes.io/elb.tls-certificate-ids: 5196aa70b0f143189e4cb54991ba2286,8125d71fcc124aabbe007610cba42d60    # SNI certificate IDs
    kubernetes.io/elb.lb-algorithm: ROUND_ROBIN
spec:
  selector:
    app: test
  externalTrafficPolicy: Cluster
  ports:
    - name: cce-service-0
      targetPort: 80
      nodePort: 0
      port: 80
      protocol: TCP
  type: LoadBalancer
  loadBalancerIP: **.**.**.**       #  Private IP address of the load balancer