64 lines
1.8 KiB
Markdown
64 lines
1.8 KiB
Markdown
# CronJob
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CronJob即定时任务，就类似于Linux系统的crontab，在指定的时间周期运行指定的任务。在Kubernetes 1.5，使用CronJob需要开启`batch/v2alpha1` API，即`--runtime-config=batch/v2alpha1`。
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## CronJob Spec
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- `.spec.schedule`指定任务运行周期，格式同[Cron](https://en.wikipedia.org/wiki/Cron)
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- `.spec.jobTemplate`指定需要运行的任务，格式同[Job](job.md)
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- `.spec.startingDeadlineSeconds`指定任务开始的截止期限
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- `.spec.concurrencyPolicy`指定任务的并发策略，支持Allow、Forbid和Replace三个选项
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```yaml
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apiVersion: batch/v2alpha1
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kind: CronJob
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metadata:
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name: hello
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spec:
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schedule: "*/1 * * * *"
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jobTemplate:
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spec:
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template:
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spec:
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containers:
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- name: hello
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image: busybox
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args:
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- /bin/sh
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- -c
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- date; echo Hello from the Kubernetes cluster
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restartPolicy: OnFailure
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```
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```
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$ kubectl create -f cronjob.yaml
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cronjob "hello" created
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```
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当然，也可以用`kubectl run`来创建一个CronJob：
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```
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kubectl run hello --schedule="*/1 * * * *" --restart=OnFailure --image=busybox -- /bin/sh -c "date; echo Hello from the Kubernetes cluster"
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```
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```
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$ kubectl get cronjob
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NAME SCHEDULE SUSPEND ACTIVE LAST-SCHEDULE
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hello */1 * * * * False 0 <none>
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$ kubectl get jobs
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NAME DESIRED SUCCESSFUL AGE
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hello-1202039034 1 1 49s
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$ pods=$(kubectl get pods --selector=job-name=hello-1202039034 --output=jsonpath={.items..metadata.name} -a)
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$ kubectl logs $pods
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Mon Aug 29 21:34:09 UTC 2016
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Hello from the Kubernetes cluster
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# 注意，删除cronjob的时候不会自动删除job，这些job可以用kubectl delete job来删除
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$ kubectl delete cronjob hello
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cronjob "hello" deleted
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```
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