Sequence Flow示例

准备实践环境

[root@master ~]# kn service create sq-appender-01 --image ikubernetes/appender --env MESSAGE=" - Handled by SQ-01"
Creating service 'sq-appender-01' in namespace 'default':

  0.084s The Route is still working to reflect the latest desired specification.
  0.084s Configuration "sq-appender-01" is waiting for a Revision to become ready.
 30.036s ...
 30.134s Ingress has not yet been reconciled.
 30.231s Waiting for load balancer to be ready
 30.412s Ready to serve.

Service 'sq-appender-01' created to latest revision 'sq-appender-01-00001' is available at URL:
http://sq-appender-01.default.yang.com
[root@master ~]# kn service create sq-appender-02 --image ikubernetes/appender --env MESSAGE=" - Handled by SQ-02"
Creating service 'sq-appender-02' in namespace 'default':

  0.044s The Route is still working to reflect the latest desired specification.
  0.071s Configuration "sq-appender-02" is waiting for a Revision to become ready.
  7.300s ...
  7.364s Ingress has not yet been reconciled.
  7.420s Waiting for load balancer to be ready
  7.627s Ready to serve.

Service 'sq-appender-02' created to latest revision 'sq-appender-02-00001' is available at URL:
http://sq-appender-02.default.yang.com
[root@master ~]# kn service create sq-appender-03 --image ikubernetes/appender --env MESSAGE=" - Handled by SQ-03"
Creating service 'sq-appender-03' in namespace 'default':

  0.043s The Route is still working to reflect the latest desired specification.
  0.063s ...
  0.076s Configuration "sq-appender-03" is waiting for a Revision to become ready.
  7.254s ...
  7.298s Ingress has not yet been reconciled.
  7.359s Waiting for load balancer to be ready
  7.612s Ready to serve.

Service 'sq-appender-03' created to latest revision 'sq-appender-03-00001' is available at URL:
http://sq-appender-03.default.yang.com

[root@master ~]# kn service list
NAME               URL                                        LATEST                   AGE   CONDITIONS   READY   REASON
event-display-01   http://event-display-01.default.yang.com   event-display-01-00001   34s   3 OK / 3     True    
sq-appender-01     http://sq-appender-01.default.yang.com     sq-appender-01-00001     17m   3 OK / 3     True    
sq-appender-02     http://sq-appender-02.default.yang.com     sq-appender-02-00001     16m   3 OK / 3     True    
sq-appender-03     http://sq-appender-03.default.yang.com     sq-appender-03-00001     16m   3 OK / 3     True 

[root@master sequence-demo]# kubectl apply -f 04-sequence-demo.yaml 
sequence.flows.knative.dev/sq-demo created
[root@master sequence-demo]# cat 04-sequence-demo.yaml 
apiVersion: flows.knative.dev/v1
kind: Sequence
metadata:
  name: sq-demo
  namespace: default
spec:
  channelTemplate:
    apiVersion: messaging.knative.dev/v1
    kind: InMemoryChannel
  steps:
    - ref:
        apiVersion: serving.knative.dev/v1
        kind: Service
        name: sq-appender-01
    - ref:
        apiVersion: serving.knative.dev/v1
        kind: Service
        name: sq-appender-02
    - ref:
        apiVersion: serving.knative.dev/v1
        kind: Service
        name: sq-appender-03
  reply:
    ref:
      kind: Service
      apiVersion: serving.knative.dev/v1
      name: event-display-01
[root@master sequence-demo]# kubectl get sequence
NAME      URL                                                                 AGE   READY   REASON
sq-demo   http://sq-demo-kn-sequence-0-kn-channel.default.svc.cluster.local   68s   True

创建一个pod进行curl请求测试

kubectl run client-$RANDOM --image=ikubernetes/admin-box:v1.2 --restart=Never -it --command -- /bin/sh

curl -v "http://sq-demo-kn-sequence-0-kn-channel.default.svc.cluster.local" -X POST -H "Content-Type: application/cloudevents+json" \
        -d '{"id": "say-bye", "specversion": "1.0", "type": "com.yang.saybye", "source": "sendoff", "data": {"message":"Hello Knative Sequence Flow"}}'

查看消息

[root@master ~]# kubectl logs -f event-display-01-00001-deployment-68d48cbdf8-lv9m4