3.10.2. 使用自定义调度程序部署 pod

流程

1. 如果您的集群使用基于角色的访问控制 (RBAC)，将自定义调度程序名称添加到 system:kube-scheduler 集群角色。

   1. 编辑 system:kube-scheduler 集群角色：

      $ oc edit clusterrole system:kube-scheduler

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   2. 将自定义调度程序的名称添加到 leases 和 endpoints 的 resourceNames 列表中：

      apiVersion: rbac.authorization.k8s.io/v1
      kind: ClusterRole
      metadata:
        annotations:
          rbac.authorization.kubernetes.io/autoupdate: "true"
        creationTimestamp: "2021-07-07T10:19:14Z"
        labels:
          kubernetes.io/bootstrapping: rbac-defaults
        name: system:kube-scheduler
        resourceVersion: "125"
        uid: 53896c70-b332-420a-b2a4-f72c822313f2
      rules:
      ...
      - apiGroups:
        - coordination.k8s.io
        resources:
        - leases
        verbs:
        - create
      - apiGroups:
        - coordination.k8s.io
        resourceNames:
        - kube-scheduler
        - custom-scheduler 

      1

      
        resources:
        - leases
        verbs:
        - get
        - update
      - apiGroups:
        - ""
        resources:
        - endpoints
        verbs:
        - create
      - apiGroups:
        - ""
        resourceNames:
        - kube-scheduler
        - custom-scheduler 

      2

      
        resources:
        - endpoints
        verbs:
        - get
        - update
      ...

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      1 2

      本例使用 custom-scheduler 作为自定义调度程序名称。

2. 创建 Pod 配置并在 schedulerName 参数中指定自定义调度程序的名称：

   custom-scheduler-example.yaml 文件示例

   apiVersion: v1
   kind: Pod
   metadata:
     name: custom-scheduler-example
     labels:
       name: custom-scheduler-example
   spec:
     schedulerName: custom-scheduler 

   1

   
     containers:
     - name: pod-with-second-annotation-container
       image: docker.io/ocpqe/hello-pod

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   1

   要使用的自定义调度程序的名称，本例中为 custom-scheduler。如果没有提供调度程序名称，pod 会自动使用默认调度程序来调度。

3. 创建 pod：

   $ oc create -f custom-scheduler-example.yaml

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验证

1. 输入以下命令检查 pod 是否已创建：

   $ oc get pod custom-scheduler-example

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   custom-scheduler-example pod 在输出中列出：

   NAME                       READY     STATUS    RESTARTS   AGE
   custom-scheduler-example   1/1       Running   0          4m

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2. 输入以下命令检查自定义调度程序是否已调度 pod：

   $ oc describe pod custom-scheduler-example

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   调度程序 custom-scheduler 如以下截断的输出所示：

   Events:
     Type    Reason          Age        From                                               Message
     ----    ------          ----       ----                                               -------
     Normal  Scheduled       <unknown>  custom-scheduler                                   Successfully assigned default/custom-scheduler-example to <node_name>

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