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CronJob
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。
CronJob Spec
.spec.schedule指定任务运行周期,格式同Cron
.spec.jobTemplate指定需要运行的任务,格式同Job
.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 |
$
kubectl create -f cronjob.yaml
cronjob "hello" created |
当然,也可以用kubectl run来创建一个CronJob:
kubectl
run hello --schedule ="*/1 * * * *"
--restart =OnFailure --image=busybox --
/bin/sh -c "date; echo Hello from the
Kubernetes cluster" |
$
kubectl get cronjob
NAME SCHEDULE SUSPEND ACTIVE LAST-SCHEDULE
hello */1 * * * * False 0 <none>
$ kubectl get jobs
NAME DESIRED SUCCESSFUL AGE
hello-1202039034 1 1 49s
$ pods=$(kubectl get pods --selector=job-name =hello-1202039034
--output=jsonpath= {.items..metadata.name}
-a)
$ kubectl logs $pods
Mon Aug 29 21:34:09 UTC 2016
Hello from the Kubernetes cluster
# 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
$ kubectl delete cronjob hello
cronjob "hello" deleted |
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1411 次浏览 |
58次 |
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