我想防止多个 python 脚本在我的 Raspberry Pi（Stretch OS）上崩溃。
我想澄清这是否是实现 systemd 文件以防止多种的 Python避免脚本崩溃。在服务文件的服务部分下，典型格式为：
[Service]
ExecStart=/path/too/script
Restart=always
但由于我正在跑步多条蟒蛇脚本，我想我应该将 python 添加到路径的前面，并将服务部分堆叠在一起。如果我错了，请纠正我。
我当前的脚本（constantrun.service）是：
[Unit]
Description='python scripts that needs to be run constantly'
[Service]
ExecStart=python /home/pi/projects/script1.py
Restart=always
[Service]
ExecStart=python /home/pi/projects/script2.py
Restart=always
[Service]
ExecStart=python /home/pi/projects/script3.py
Restart=always
[Install]
WantedBy=multi-user.target
但是，当我运行时尝试使用sudo systemctl start constantrun.service.我收到以下错误：
Failed to start constantrun.service: Unit constantrun.service is not loaded properly: Invalid argument.
See system logs and 'systemctl status constantrun.service' for details.
我打开日志，看到：
● constantrun.service - 'python scripts that needs to be run constantly'
Loaded: error (Reason: Invalid argument)
Active: inactive (dead)
Feb 18 17:15:12 raspberrypi systemd[1]: [/lib/systemd/system/constantrun.service:11] Executable path is not absolute, ignoring: python /home/pi/P
Feb 18 17:15:12 raspberrypi systemd[1]: constantrun.service: Service lacks both ExecStart= and ExecStop= setting. Refusing.
Feb 18 17:20:17 raspberrypi systemd[1]: [/lib/systemd/system/constantrun.service:5] Executable path is not absolute, ignoring: python /home/pi/Pr
Feb 18 17:20:17 raspberrypi systemd[1]: [/lib/systemd/system/constantrun.service:8] Executable path is not absolute, ignoring: python /home/pi/Pr
Feb 18 17:20:17 raspberrypi systemd[1]: [/lib/systemd/system/constantrun.service:11] Executable path is not absolute, ignoring: python /home/pi/P
Feb 18 17:20:17 raspberrypi systemd[1]: constantrun.service: Service lacks both ExecStart= and ExecStop= setting. Refusing.
Feb 18 17:20:33 raspberrypi systemd[1]: [/lib/systemd/system/constantrun.service:5] Executable path is not absolute, ignoring: python /home/pi/Pr
Feb 18 17:20:33 raspberrypi systemd[1]: [/lib/systemd/system/constantrun.service:8] Executable path is not absolute, ignoring: python /home/pi/Pr
Feb 18 17:20:33 raspberrypi systemd[1]: [/lib/systemd/system/constantrun.service:11] Executable path is not absolute, ignoring: python /home/pi/P
Feb 18 17:20:33 raspberrypi systemd[1]: constantrun.service: Service lacks both ExecStart= and ExecStop= setting. Refusing.
如何修改上面的代码才能使其正常工作？另外，我是否需要添加我的 python 库的路径，例如PYTHONPATH=/home/pi/.local/lib/python2.7/site-packages？
我对 Linux 环境真的很陌生，非常感谢对此的任何建议！
答案1
您的服务定义如下：
[Service]
ExecStart=python /home/pi/projects/script1.py
Restart=always
这是每个错误消息：
Executable path is not absolute, ignoring: python /home/pi/...
对于systemd，该服务定义中的“可执行文件”是python，这显然不是绝对路径。这/home/pi/projects/script1.py只是这个python可执行文件的一个参数，关心它的正确形式是可执行文件的工作。
任何特定于 Python 的环境变量（例如：您）PYTHONPATH根本没有任何意义systemd必须每次都为其提供服务定义中可执行文件的绝对路径。
通常，python 解释器的绝对路径是/usr/bin/python，但您可以检查：
$ type python
python is /usr/bin/python
所以你的服务定义应该是这样的：
[Service]
ExecStart=/usr/bin/python /home/pi/projects/script1.py
Restart=always
可以在这里找到有关 systemd 的非常有用的介绍。它获取并保持 Telegram 机器人作为 Python 脚本运行。