49 lines
1.3 KiB
Markdown
49 lines
1.3 KiB
Markdown
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---
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title: "Job"
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---
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Job负责批处理任务，即仅执行一次的任务，它保证批处理任务的一个或多个Pod成功结束。
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## Job Spec格式
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- spec.template格式同Pod
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- RestartPolicy仅支持Never或OnFailure
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- 单个Pod时，默认Pod成功运行后Job即结束
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- `.spec.completions`标志Job结束需要成功运行的Pod个数，默认为1
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- `.spec.parallelism`标志并行运行的Pod的个数，默认为1
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- `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
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一个简单的例子：
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```yaml
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apiVersion: batch/v1
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kind: Job
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metadata:
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name: pi
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spec:
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template:
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metadata:
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name: pi
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spec:
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containers:
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- name: pi
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image: perl
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command: ["perl", "-Mbignum=bpi", "-wle", "print bpi(2000)"]
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restartPolicy: Never
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```
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```
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$ kubectl create -f ./job.yaml
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job "pi" created
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$ pods=$(kubectl get pods --selector=job-name=pi --output=jsonpath={.items..metadata.name})
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$ kubectl logs $pods
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3.141592653589793238462643383279502...
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```
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## Bare Pods
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所谓Bare Pods是指直接用PodSpec来创建的Pod（即不在ReplicaSets或者ReplicationCtroller的管理之下的Pods）。这些Pod在Node重启后不会自动重启，但Job则会创建新的Pod继续任务。所以，推荐使用Job来替代Bare Pods，即便是应用只需要一个Pod。
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