5.8.3. 使用 YAML 文件创建 API 服务器源

1. 以 YAML 文件形式,为事件源创建服务帐户、角色和角色绑定：

   apiVersion: v1
   kind: ServiceAccount
   metadata:
     name: events-sa
     namespace: default 1
   
   ---
   apiVersion: rbac.authorization.k8s.io/v1
   kind: Role
   metadata:
     name: event-watcher
     namespace: default 2
   rules:
     - apiGroups:
         - ""
       resources:
         - events
       verbs:
         - get
         - list
         - watch
   
   ---
   apiVersion: rbac.authorization.k8s.io/v1
   kind: RoleBinding
   metadata:
     name: k8s-ra-event-watcher
     namespace: default 3
   roleRef:
     apiGroup: rbac.authorization.k8s.io
     kind: Role
     name: event-watcher
   subjects:
     - kind: ServiceAccount
       name: events-sa
       namespace: default 4

   1 2 3 4

   将这个命名空间更改为已选择安装事件源的命名空间。

2. 应用 YAML 文件：

   $ oc apply -f <filename>

3. 将 API 服务器源创建为 YAML 文件：

   apiVersion: sources.knative.dev/v1alpha1
   kind: ApiServerSource
   metadata:
     name: testevents
   spec:
     serviceAccountName: events-sa
     mode: Resource
     resources:
       - apiVersion: v1
         kind: Event
     sink:
       ref:
         apiVersion: eventing.knative.dev/v1
         kind: Broker
         name: default

4. 应用 ApiServerSource YAML 文件：

   $ oc apply -f <filename>

5. 要检查 API 服务器源是否已正确设置，请创建一个 Knative 服务作为 YAML 文件，在日志中转储传入的信息：

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

6. 应用 Service YAML 文件：

   $ oc apply -f <filename>

7. 创建一个 Trigger 对象作为一个 YAML 文件，该文件将事件从 default 代理过滤到上一步中创建的服务：

   apiVersion: eventing.knative.dev/v1
   kind: Trigger
   metadata:
     name: event-display-trigger
     namespace: default
   spec:
     broker: default
     subscriber:
       ref:
         apiVersion: serving.knative.dev/v1
         kind: Service
         name: event-display

8. 应用 Trigger YAML 文件：

   $ oc apply -f <filename>

9. 通过在 default 命名空间中启动 pod 来创建事件：

   $ oc create deployment hello-node --image=quay.io/openshift-knative/knative-eventing-sources-event-display

10. 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 apiserversource.sources.knative.dev testevents -o yaml

    输出示例

    apiVersion: sources.knative.dev/v1alpha1
    kind: ApiServerSource
    metadata:
      annotations:
      creationTimestamp: "2020-04-07T17:24:54Z"
      generation: 1
      name: testevents
      namespace: default
      resourceVersion: "62868"
      selfLink: /apis/sources.knative.dev/v1alpha1/namespaces/default/apiserversources/testevents2
      uid: 1603d863-bb06-4d1c-b371-f580b4db99fa
    spec:
      mode: Resource
      resources:
      - apiVersion: v1
        controller: false
        controllerSelector:
          apiVersion: ""
          kind: ""
          name: ""
          uid: ""
        kind: Event
        labelSelector: {}
      serviceAccountName: events-sa
      sink:
        ref:
          apiVersion: eventing.knative.dev/v1
          kind: Broker
          name: default

1. 输入以下命令来获取 pod：

   $ oc get pods

2. 输入以下命令来查看 pod 的消息转储程序功能日志：

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

   输出示例

   ☁️  cloudevents.Event
   Validation: valid
   Context Attributes,
     specversion: 1.0
     type: dev.knative.apiserver.resource.update
     datacontenttype: application/json
     ...
   Data,
     {
       "apiVersion": "v1",
       "involvedObject": {
         "apiVersion": "v1",
         "fieldPath": "spec.containers{hello-node}",
         "kind": "Pod",
         "name": "hello-node",
         "namespace": "default",
          .....
       },
       "kind": "Event",
       "message": "Started container",
       "metadata": {
         "name": "hello-node.159d7608e3a3572c",
         "namespace": "default",
         ....
       },
       "reason": "Started",
       ...
     }

删除 API 服务器源

1. 删除触发器：

   $ oc delete -f trigger.yaml

2. 删除事件源：

   $ oc delete -f k8s-events.yaml

3. 删除服务帐户、集群角色和集群绑定：

   $ oc delete -f authentication.yaml