10.5. 使用 SinkBinding

流程

1. 要检查 SinkBinding 是否已正确设置，请创建一个 Knative 事件显示服务或事件 sink，在日志中转储传入的信息：

   $ kn service create event-display --image quay.io/openshift-knative/knative-eventing-sources-event-display:latest

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2. 创建一个 SinkBinding 把事件发送到服务：

   $ kn source binding create bind-heartbeat --subject Job:batch/v1:app=heartbeat-cron --sink svc:event-display

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3. 创建 CronJob：

   1. 创建名为 heartbeats-cronjob.yaml 的文件，并将以下示例代码复制到其中：

      apiVersion: batch/v1beta1
      kind: CronJob
      metadata:
        name: heartbeat-cron
      spec:
      spec:
        # Run every minute
        schedule: "* * * * *"
        jobTemplate:
          metadata:
            labels:
              app: heartbeat-cron
          spec:
            template:
              spec:
                restartPolicy: Never
                containers:
                  - name: single-heartbeat
                    image: quay.io/openshift-knative/knative-eventing-sources-heartbeats:latest
                    args:
                      - --period=1
                    env:
                      - name: ONE_SHOT
                        value: "true"
                      - name: POD_NAME
                        valueFrom:
                          fieldRef:
                            fieldPath: metadata.name
                      - name: POD_NAMESPACE
                        valueFrom:
                          fieldRef:
                            fieldPath: metadata.namespace

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   2. 在创建了 heartbeats-cronjob.yaml 文件后，请输入：

      $ oc apply -f heartbeats-cronjob.yaml

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4. 输入以下命令并检查输出，检查是否正确映射了控制器：

   $ kn source binding describe bind-heartbeat

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   Name:         bind-heartbeat
   Namespace:    demo-2
   Annotations:  sources.knative.dev/creator=minikube-user, sources.knative.dev/lastModifier=minikub ...
   Age:          2m
   Subject:
     Resource:   job (batch/v1)
     Selector:
       app:      heartbeat-cron
   Sink:
     Name:       event-display
     Resource:   Service (serving.knative.dev/v1)
   
   Conditions:
     OK TYPE     AGE REASON
     ++ Ready     2m

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流程

1. 要检查 SinkBinding 是否已正确设置，请创建一个 Knative 事件显示服务或事件挂起，从而在日志中转储传入的信息。

   1. 将以下示例 YAML 复制到一个名为 service.yaml 的文件中：

      apiVersion: serving.knative.dev/v1
      kind: Service
      metadata:
        name: event-display
      spec:
        template:
          spec:
            containers:
              - image: quay.io/openshift-knative/knative-eventing-sources-event-display:latest

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   2. 创建 service.yaml 文件后，输入以下内容应用它：

      $ oc apply -f service.yaml

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2. 创建将事件定向到该服务的 SinkBinding。

   1. 创建名为 sinkbinding.yaml 的文件，并将以下示例代码复制到其中：

      apiVersion: sources.knative.dev/v1alpha1
      kind: SinkBinding
      metadata:
        name: bind-heartbeat
      spec:
        subject:
          apiVersion: batch/v1
          kind: Job 

      1

      
          selector:
            matchLabels:
              app: heartbeat-cron
      
        sink:
          ref:
            apiVersion: serving.knative.dev/v1
            kind: Service
            name: event-display

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      1

      在本例中，任何具有标签 app: heartbeat-cron 的作业都将被绑定到事件 sink。

   2. 创建 sinkbinding.yaml 文件后，输入以下内容应用它：

      $ oc apply -f sinkbinding.yaml

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3. 创建 CronJob：

   1. 创建名为 heartbeats-cronjob.yaml 的文件，并将以下示例代码复制到其中：

      apiVersion: batch/v1beta1
      kind: CronJob
      metadata:
        name: heartbeat-cron
      spec:
      spec:
        # Run every minute
        schedule: "* * * * *"
        jobTemplate:
          metadata:
            labels:
              app: heartbeat-cron
          spec:
            template:
              spec:
                restartPolicy: Never
                containers:
                  - name: single-heartbeat
                    image: quay.io/openshift-knative/knative-eventing-sources-heartbeats:latest
                    args:
                      - --period=1
                    env:
                      - name: ONE_SHOT
                        value: "true"
                      - name: POD_NAME
                        valueFrom:
                          fieldRef:
                            fieldPath: metadata.name
                      - name: POD_NAMESPACE
                        valueFrom:
                          fieldRef:
                            fieldPath: metadata.namespace

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   2. 在创建了 heartbeats-cronjob.yaml 文件后，请输入：

      $ oc apply -f heartbeats-cronjob.yaml

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4. 输入以下命令并检查输出，检查是否正确映射了控制器：

   $ oc get sinkbindings.sources.knative.dev bind-heartbeat -oyaml

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   spec:
     sink:
       ref:
         apiVersion: serving.knative.dev/v1
         kind: Service
         name: event-display
         namespace: default
     subject:
       apiVersion: batch/v1
       kind: Job
       namespace: default
       selector:
         matchLabels:
           app: heartbeat-cron

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1. 输入命令：

   $ oc get pods

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2. 输入命令：

   $ oc logs $(oc get pod -o name | grep event-display) -c user-container

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   输出示例

   ☁️  cloudevents.Event
   Validation: valid
   Context Attributes,
     specversion: 1.0
     type: dev.knative.eventing.samples.heartbeat
     source: https://knative.dev/eventing-contrib/cmd/heartbeats/#event-test/mypod
     id: 2b72d7bf-c38f-4a98-a433-608fbcdd2596
     time: 2019-10-18T15:23:20.809775386Z
     contenttype: application/json
   Extensions,
     beats: true
     heart: yes
     the: 42
   Data,
     {
       "id": 1,
       "label": ""
     }

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