《K8s Job/CronJob 实战：定时任务与一次性任务》（664）
## 《K8s Job/CronJob 实战：定时任务与一次性任务》 🚀
在 Kubernetes 中，**Job** 和 **CronJob** 是管理**一次性任务**和**定时任务**的核心组件，适用于数据处理、报表生成、备份等场景。
### **1. Job：一次性任务** 🔥
Job 用于执行**一次性任务**，确保任务成功完成。如果任务失败，Job 会自动重试，直到达到指定的重试次数或成功为止。
**示例场景**：
- 数据处理任务
- 数据库迁移
- 批量计算
**YAML 示例**：
```yaml
apiVersion: batch/v1
kind: Job
metadata:
name: data-processor
spec:
template:
spec:
containers:
- name: processor
image: busybox
command: ["sh", "-c", "echo 'Processing data...' && sleep 5"]
restartPolicy: Never
backoffLimit: 3 # 失败重试次数
```
### **2. CronJob：定时任务** ⏰
CronJob 基于 **Cron 表达式** 定时执行任务，类似于 Linux 的 `crontab`，适用于周期性任务。
**示例场景**：
- 每日日志清理
- 定时报表生成
- 定期数据同步
**YAML 示例**：
```yaml
apiVersion: batch/v1
kind: CronJob
metadata:
name: daily-cleanup
spec:
schedule: "0 3 * * *" # 每天凌晨3点执行
jobTemplate:
spec:
template:
spec:
containers:
- name: cleaner
image: busybox
command: ["sh", "-c", "echo 'Cleaning up logs...'"]
restartPolicy: OnFailure
```
### **总结** 🎯
- **Job**：适合一次性任务，确保任务完成。
- **CronJob**：适合定时任务，按计划执行。
通过合理使用 Job 和 CronJob，可以高效管理 Kubernetes 中的批处理任务！💡
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