《K8s Job/CronJob 实战：定时任务与一次性任务》（905）

# **K8s Job/CronJob 实战：定时任务与一次性任务** 

在 Kubernetes（K8s）中，**Job** 和 **CronJob** 是管理**一次性任务**和**定时任务**的核心资源。它们适用于数据处理、备份、日志清理等场景，让任务调度更灵活高效！✨ 

## **1. Job：一次性任务** 🔥 
**Job** 确保 Pod 成功运行并完成任务，适合批处理作业或单次任务。 

**示例 YAML**： 
```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
``` 
📌 **关键点**： 
- `restartPolicy: Never`（失败不重启）或 `OnFailure`（失败时重启） 
- 任务完成后，Job 仍保留，方便查看日志 🔍 

## **2. CronJob：定时任务** 
**CronJob** 基于时间调度任务，类似 Linux 的 `crontab`。 

**示例 YAML**： 
```yaml
apiVersion: batch/v1
kind: CronJob
metadata:
 name: daily-backup
spec:
 schedule: "0 3 * * *" # 每天凌晨3点执行
 jobTemplate:
  spec:
   template:
    spec:
     containers:
     - name: backup
      image: busybox
      command: ["sh", "-c", "echo 'Backing up data...'"]
     restartPolicy: OnFailure
``` 
📌 **关键点**： 
- `schedule` 使用 **Cron 表达式**（如 `*/5 * * * *` 每5分钟） 
- 支持并发策略（`concurrencyPolicy: Allow/Forbid/Replace`） 

## **总结** 🎯 
- **Job**：适合一次性任务，如数据处理、测试任务 ✅ 
- **CronJob**：适合定时任务，如备份、日志清理 📅 

K8s 的任务调度能力让运维更轻松，快去试试吧！💡
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