Configuring HTTP/2 for a LoadBalancer Service

Services can be exposed via HTTP/2. By default, HTTP/1.x is used between clients and load balancers. HTTP/2 can improve access performance between clients and load balancers, but HTTP/1.x is still used between load balancers and backend servers.

Note

  • An HTTPS-compliant load balancer supports HTTP/2.

  • After HTTP/2 is configured, if you delete the advanced configuration for enabling HTTP/2 on the CCE console or delete the target annotation from the YAML file, the configuration on the ELB will be retained.

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

  • 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 are listed. For details about how to configure other parameters, see Creating a LoadBalancer Service.

    • 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 HTTP/2. For a dedicated load balancer, to use HTTP/HTTPS, the type of the load balancer must be Application (HTTP/HTTPS).

    • Listener

      • SSL authentication is available only in clusters of v1.23.14-r0, v1.25.9-r0, v1.27.6-r0, v1.28.4-r0, or later versions.

        • One-way authentication: Only the backend server is authenticated. If you also need to authenticate the identity of the client, select mutual authentication.

        • Mutual authentication: If you want the clients and the load balancer to authenticate each other, select this option. Only authenticated clients will be allowed to access the load balancer.

      • CA Certificate: If SSL Authentication is set to Mutual authentication, add a CA certificate to authenticate the client. A CA certificate is issued by a certificate authority (CA) and used to verify the certificate issuer. If HTTPS mutual authentication is required, HTTPS connections can be established only when the client provides a certificate issued by a specific CA.

      • Server Certificate: Select a server certificate when HTTPS is used.

      • SNI: Add an SNI certificate containing a domain name.

      • Advanced Options: Click Add custom container network settings and enable HTTP/2.

  4. Click OK.

Using kubectl

To enable HTTP/2, add the following annotation:

kubernetes.io/elb.http2-enable: 'true'

The following shows an example YAML file where an existing load balancer is associated:

apiVersion: v1
kind: Service
metadata:
  name: test
  labels:
    app: test
    version: v1
  namespace: default
  annotations:
    kubernetes.io/elb.class: performance
    kubernetes.io/elb.id: 35cb350b-23e6-4551-ac77-10d5298f5204
    kubernetes.io/elb.protocol-port: https:443
    kubernetes.io/elb.cert-id: b64ab636f1614e1a960b5249c497a880
    kubernetes.io/elb.http2-enable: 'true'
    kubernetes.io/elb.lb-algorithm: ROUND_ROBIN
spec:
  selector:
    app: test
    version: v1
  externalTrafficPolicy: Cluster
  ports:
    - name: cce-service-0
      targetPort: 80
      nodePort: 0
      port: 443
      protocol: TCP
  type: LoadBalancer
  loadBalancerIP: **.**.**.**
Table 1 HTTP/2 parameters

Parameter

Type

Description

kubernetes.io/elb.protocol-port

String

If a Service is HTTP/HTTPS-compliant, configure the protocol and port number in the format of "protocol:port".

where,

  • protocol: specifies the protocol used by the listener port. The value can be http or https.

  • ports: Service ports specified by spec.ports[].port.

For example, to use HTTPS, the Service port must be 443. Therefore, the parameter value is https:443.

kubernetes.io/elb.cert-id

String

ID of an ELB certificate, which is used as the HTTPS server certificate.

To obtain the certificate, log in to the CCE console, choose Service List > Networking > Elastic Load Balance, and click Certificates in the navigation pane. In the load balancer list, copy the ID under the target certificate name.

kubernetes.io/elb.http2-enable

String

Whether HTTP/2 is enabled. Request forwarding using HTTP/2 improves the access performance between your application and the load balancer. However, the load balancer still uses HTTP/1.x to forward requests to the backend server.

Options:

  • true: enabled

  • false: disabled (default value)

Note: HTTP/2 can be enabled or disabled only when the listener uses HTTPS. This parameter is invalid and defaults to false when the listener protocol is HTTP.

last updated: 2024-12-13 13:16 UTC - commit: 637711c1b4cbb67ff8f1429f87a3eb6e1d7d78bc