问题：怎么将Python脚本以systemd的方式运行？怎么把Python应用设置为自动启动？
Step 1 编写Python应用（最好以virtualenv的方式，将python和模块安装到Python应用目录中），不管以模式或者其他方式运行，只要记下可以正常运行的命令行以及相应的目录。
/data/xncd/python/xnbatchpersistence/venv/bin/python -m app.schedule.scheduler
Step 2 生成systemd服务文件
vi /lib/systemd/system/xnbatch.service
文件内容如下：
[Unit]
Description=xnBatch Service
After=multi-user.target
Conflicts=getty@tty1.service
[Service]
Type=simple
WorkingDirectory=/data/xncd/python/xnbatchpersistence
ExecStart=/data/xncd/python/xnbatchpersistence/venv/bin/python -m app.schedule.scheduler
StandardInput=tty-force
[Install]
WantedBy=multi-user.target
Step 3 启用服务
systemctl daemon-reload
systemctl enable xnbatch
systemctl start xnbatch
Step 4 检测服务是否正常运行
systemctl status xnbatch
如果显示为activate，则表示安装成功：
systemctl status xnbatch
● xnbatch.service - xnBatch Service
Loaded: loaded (/usr/lib/systemd/system/xnbatch.service; enabled; vendor preset: disabled)
Active: active (running) since 二 2019-10-08 21:55:57 CST; 18min ago
Main PID: 13755 (python)
CGroup: /system.slice/xnbatch.service
└─13755 /data/xncd/python/xnbatchpersistence/venv/bin/python -m app.schedule.scheduler
10月 08 21:55:57 izuf66xttbby2as7xqznx2z systemd[1]: Started xnBatch Service.
Step 4 服务控制
停止服务
systemctl stop xbatch
启动服务
systemctl start xnbatch
重启服务
systemctl restart xnbatch
