在ASK集群中，您可以按需按量创建Pod。当Pod结束后停止收费，无需为Job任务预留计算资源，从而摆脱集群计算力不足和扩容的烦扰，同时结合抢占式实例可以降低Job任务的计算成本。本文主要为您介绍如何通过ASK按需创建Job任务。

操作步骤

  1. 通过kubectl客户端创建job.yaml文件，并拷贝以下内容到该文件。 
    apiVersion: batch/v1
kind: Job
metadata:
  name: pi
spec:
  template:
    spec:
      containers:
      - name: pi
        image: perl
        command: ["perl",  "-Mbignum=bpi", "-wle", "print bpi(2000)"]
        resources:
          requests:
            cpu: 16
            memory: 32Gi
      restartPolicy: Never
  backoffLimit: 4
  2. 执行以下命令部署一个job任务。 
    kubectl apply -f job.yaml
  3. 执行以下命令，查看Pod的运行状态。

    查看Pod的状态。

    kubectl get pod
    NAME       READY   STATUS      RESTARTS   AGE
pi-4f7w5   0/1     Completed   0          80s

    查看Pod的具体运行状态。

    kubectl describe pod
    Name:               pi-4f7w5
Namespace:          default
Priority:           0
PriorityClassName:  <none>
Node:               virtual-kubelet-cn-hongkong-b/10.10.66.169
...
Events:
  Type    Reason                 Age   From          Message
  ----    ------                 ----  ----          -------
  Normal  SuccessfulMountVolume  114s  kubelet, eci  MountVolume.SetUp succeeded for volume "default-token-8k4jz"
  Normal  Pulling                113s  kubelet, eci  pulling image "perl"
  Normal  Pulled                 64s   kubelet, eci  Successfully pulled image "perl"
  Normal  Created                64s   kubelet, eci  Created container
  Normal  Started                64s   kubelet, eci  Started container
  4. 可选：通过给Pod加上抢占式实例的annotation，使用抢占式实例。
    关于抢占式实例annotation的用法，请参见 使用抢占式实例。 
    apiVersion: batch/v1
kind: Job
metadata:
  name: pi
spec:
  template:
    metadata:
      annotations:
        k8s.aliyun.com/eci-spot-strategy: SpotAsPriceGo
    spec:
      containers:
      - name: pi
        image: perl
        command: ["perl",  "-Mbignum=bpi", "-wle", "print bpi(2000)"]
        resources:
          requests:
            cpu: 16
            memory: 32Gi
      restartPolicy: Never
  backoffLimit: 4