Configuring Grayscale Release for a LoadBalancer Ingress

Notes and Constraints

• This feature takes effect only in the following versions:
  • v1.23: v1.23.14-r0 or later
  • v1.25: v1.25.9-r0 or later
  • v1.27: v1.27.6-r0 or later
  • v1.28: v1.28.4-r0 or later
  • Other clusters of later versions
• After a grayscale ingress is created, do not delete the original ingress.
• If the listeners of a load balancer associate with multiple ingresses configured with multiple grayscale release policies, the header-based policy has the highest priority, cookie has the second highest priority, and weight has the lowest priority.

Prerequisites

You have created an ingress that is associated with a dedicated load balancer.

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, switch to the Ingresses tab, locate the row containing the ingress for which you want to configure grayscale release, and choose More > Create Grayscale Release in the Operation column.
3. Configure grayscale release parameters.

   Table 1 Key parameters

   Parameter	Description	Example
   Gray release	HTTP request header: When the header key-value pair in an HTTP request is matched, the grayscale release service can be accessed. If domain names and paths are configured for an ingress forwarding policy, a maximum of eight values can be configured. If only paths are configured for an ingress forwarding policy, a maximum of nine values can be configured. Cookie: When the cookie key-value pair in an HTTP request is matched, the grayscale release service can be accessed. Proportion: percentage of the requests for accessing the grayscale release service to the total number of requests	HTTP request header
   Forwarding Policy	Domain Name: Enter an actual domain name to be accessed. If it is left blank, the ingress can be accessed through the IP address. Ensure that the domain name has been registered and licensed. Once a forwarding policy is configured with a domain name specified, you must use the domain name for access. Grayscale Release: After grayscale release is enabled for a domain name, external access traffic of the cluster will be forwarded to the target Service using the selected traffic policy. Traffic Policy: Select an option from HTTP request header, Cookie, and Proportion as needed. (The percentage of a grayscale request is 0%.) Destination Service: Select an existing Service or create a Service. Any Services that do not match the search criteria will be filtered out automatically. Destination Service Port: Select the access port of the destination Service.	Domain Name: You do not need to configure this parameter. Grayscale Release: enabled Traffic Policy: HTTP request header Destination Service: nginx Destination Service Port: 80

4. Click OK.

Using kubectl

1. Deploy the original service.
   1. Deploy a workload named origin-server.
   2. Deploy a Service named origin-service and associate it with the created origin-server workload. (Create a NodePort Service in a CCE standard cluster or a ClusterIP Service in a CCE Turbo cluster.)
   3. Deploy an ingress named origin-ingress and associate it with the created origin-service Service.
      Configure the ingress as follows:

      apiVersion: networking.k8s.io/v1
      kind: Ingress
      metadata:
        name: origin-ingress
        namespace: default
        annotations:
          kubernetes.io/elb.port: '81'
          kubernetes.io/elb.id: e491f4e7-2351-4984-ad0a-8569e5e964a3
          kubernetes.io/elb.class: performance
      spec:
        rules:
          - host: example.com
            http:
              paths:
                - path: /
                  backend:
                    service:
                      name: origin-service
                      port:
                        number: 81
                  property:
                    ingress.beta.kubernetes.io/url-match-mode: STARTS_WITH
                  pathType: ImplementationSpecific
        ingressClassName: cce

2. Grayscale release a new version for the Service.

   Deploy the workload, Service, and ingress of a new version so that traffic can be routed to the Service of the new version by weight or header.

   1. Deploy a workload named canary-server.
   2. Deploy a Service named canary-service and associate it with the created canary-server workload. (Create a NodePort Service in a CCE standard cluster or a ClusterIP Service in a CCE Turbo cluster.)
   3. Deploy an ingress named canary-weight-ingress and associate it with the created canary-service Service for grayscale release by weight. For details about the parameters, see Parameters.
      Configure the ingress as follows:

      apiVersion: networking.k8s.io/v1
      kind: Ingress
      metadata:
        name: canary-weight-ingress
        namespace: default
        annotations:
          kubernetes.io/elb.canary: 'true'             // Set this parameter to true, indicating that canary annotation is enabled.
          kubernetes.io/elb.canary-weight: '40'        // Configure a weight, indicating that 40% of the request traffic will be routed to the Service of the new version.
          kubernetes.io/elb.class: performance         // Only dedicated load balancers support grayscale release.
          kubernetes.io/elb.id: e491f4e7-2351-4984-ad0a-8569e5e964a3
          kubernetes.io/elb.port: '81'
      spec:
        ingressClassName: cce
        rules:
          - host: example.com
            http:
              paths:
                - path: /
                  pathType: ImplementationSpecific
                  backend:
                    service:
                      name: canary-service
                      port:
                        number: 81
                  property:
                    ingress.beta.kubernetes.io/url-match-mode: STARTS_WITH

   4. Deploy an ingress named canary-header-ingress and associate it with the created canary-service Service for grayscale release by header.
      Configure the ingress as follows:

      apiVersion: networking.k8s.io/v1
      kind: Ingress
      metadata:
        name: canary-header-ingress
        namespace: default
        annotations:
          kubernetes.io/elb.canary: 'true'
          kubernetes.io/elb.canary-by-header: 'location'                           // Set the header key to location.
          kubernetes.io/elb.canary-by-header-value: '{"values":["hz","sz","sh"]}'  // Set the header values to hz, sz, and sh.
          kubernetes.io/elb.class: performance
          kubernetes.io/elb.id: e491f4e7-2351-4984-ad0a-8569e5e964a3
          kubernetes.io/elb.port: '81'
      spec:
        ingressClassName: cce
        rules:
          - host: example.com
            http:
              paths:
                - path: /
                  pathType: ImplementationSpecific
                  backend:
                    service:
                      name: canary-service
                      port:
                        number: 80
                  property:
                    ingress.beta.kubernetes.io/url-match-mode: STARTS_WITH

   5. Check whether the new version is grayscale released.
      1. Check the creation of the ingress.

         $ kubectl get ingress
         NAME                    CLASS   HOSTS        ADDRESS        PORTS   AGE
         canary-header-ingress   cce     example.com   88.88.88.165   80      46s
         canary-weight-ingress   cce     example.com   88.88.88.165   80      117s
         origin-ingress          cce     example.com   88.88.88.165   80      2m25s

      2. Check ELB rules.

         

      3. Check the result of a service request.
         1. Use the location: hz request header to access the Service.

            $ curl -H "Host: example.com" -H "location: hz" http://88.88.88.165:81/

         2. Expected result:

            $ new

            Attempt the access for multiple times. All the returned results are new.

         3. Access the Service without using a request header.

            $ curl -H "Host: example.com" http://88.88.88.165:81/

         4. Expected result: 40% for new, and 60% for old

3. Terminate the old-version Service.

   After the Service of the new version runs stably, terminate the Service of the old version. During the Service termination, change the original Service to the new-version Service so that all traffic will be routed to the new-version Service. Then, delete the grayscale released ingress.

   1. Change the original Service to the new-version Service.

      apiVersion: networking.k8s.io/v1
      kind: Ingress
      metadata:
        name: origin-ingress
        namespace: default
        annotations:
          kubernetes.io/elb.port: '81'
          kubernetes.io/elb.id: e491f4e7-2351-4984-ad0a-8569e5e964a3
          kubernetes.io/elb.class: performance
      spec:
        rules:
          - host: example.com
            http:
              paths:
                - path: /
                  backend:
                    service:
                      name: canary-service
                      port:
                        number: 81
                  property:
                    ingress.beta.kubernetes.io/url-match-mode: STARTS_WITH
                  pathType: ImplementationSpecific
        ingressClassName: cce

   2. Check whether the old-version Service has been terminated.
      1. Initiate a request with a header and a request without a header to access the Service.

         $ curl -H "Host: example.com" -H "location: hz" http://88.88.88.165:81/
         $ curl -H "Host: example.com" http://88.88.88.165:81/

      2. Expected result: All results are returned from the new-version Service.
   3. Delete the grayscale released ingress.

      $ kubectl delete ingress canary-weight-ingress canary-header-ingress

Parameters

{"persistence_timeout": "1440"}

'{"values":["a","b"]}'

'{"values":["a","b"]}'