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知乎专栏多维度架构

6.11. Job/CronJob

6.11.1. CronJob

			
kubectl run hello --schedule="*/1 * * * *" --restart=OnFailure --image=busybox -- /bin/sh -c "date; echo Hello from the Kubernetes cluster"

kubectl delete cronjob hello
			
			

6.11.2. Job

执行单词任务

.spec.completions 标志Job结束需要成功运行的Pod个数,默认为1

.spec.parallelism 标志并行运行的Pod的个数,默认为1

.spec.activeDeadlineSeconds 标志失败Pod的重试最大时间,超过这个时间不会继续重试

			
apiVersion: batch/v1
kind: Job
metadata:
  name: busybox
spec:
  completions: 1
  parallelism: 1
  template:
    metadata:
      name: busybox
    spec:
      containers:
      - name: busybox
        image: busybox
        command: ["echo", "hello"]
      restartPolicy: Never			
			
				

			
$ kubectl create -f job.yaml
job "busybox" created
$ pods=$(kubectl get pods --selector=job-name=busybox --output=jsonpath={.items..metadata.name})
$ kubectl logs $pods		
			
				
计划任务

.spec.schedule 指定任务运行周期,格式同Cron

.spec.startingDeadlineSeconds 指定任务开始的截止期限

.spec.concurrencyPolicy 指定任务的并发策略,支持Allow、Forbid和Replace三个选项

			
apiVersion: batch/v2alpha1
kind: CronJob
metadata:
  name: hello
spec:
  schedule: "*/1 * * * *"
  jobTemplate:
    spec:
      template:
        spec:
          containers:
          - name: hello
            image: busybox
            args:
            - /bin/sh
            - -c
            - date; echo Hello from the Kubernetes cluster
          restartPolicy: OnFailure