# 如何管理 Docker 备份 Systemd 服务

## 1. 服务状态检查

1. **查看服务状态**
   ```bash
   systemctl status docker-backup.service
   ```

2. **查看 Timer 状态**
   ```bash
   systemctl status docker-backup.timer
   ```

## 2. 启动和停止服务

1. **启动服务**
   ```bash
   systemctl start docker-backup.service
   systemctl enable docker-backup.timer  # 开机自启
   ```

2. **停止服务**
   ```bash
   systemctl stop docker-backup.service
   systemctl disable docker-backup.timer  # 取消开机自启
   ```

## 3. 修改定时计划

1. **编辑 Timer 配置**
   使用 `systemctl edit docker-backup.timer` 或直接编辑 `/etc/systemd/system/docker-backup.timer`

2. **常见调度示例**
   - 每天凌晨 2 点：`OnCalendar=*-*-* 02:00:00`
   - 每周一凌晨 2 点：`OnCalendar=Mon *-*-* 02:00:00`
   - 每月 1 号凌晨 2 点：`OnCalendar=*-*-01 02:00:00`

3. **重载配置**
   ```bash
   systemctl daemon-reload
   systemctl restart docker-backup.timer
   ```

## 4. 查看服务日志

1. **查看最近日志**
   ```bash
   journalctl -u docker-backup.service
   ```

2. **实时监控日志**
   ```bash
   journalctl -f -u docker-backup.service
   ```

3. **查看指定时间范围日志**
   ```bash
   journalctl -u docker-backup.service --since "1 hour ago"
   ```